Posts made by pavelneuman

Všimnul jsem si toho před pár dny, a je to paráda, hlavně jak to krásně odděluje pevninu. Ještě by se mi líbil nějaký hybrid s IR ;-)

Congrats!

Today is the 51st Anniversary of the Hurricane Camille landfall in Mississippi on August 17, 1969.

Hurricane Camille made landfall late in the evening near Waveland, Mississippi. Combination of wind, surge, and rainfall resulted in 256 deaths (143 along the Gulf Coast and 113 in the Virginia floods).

Quick Facts

• Hurricane Camille made landfall, along the Mississippi Gulf Coast near Waveland late in the evening on August 17
• Camille is one of only four Category 5 hurricanes ever to make landfall in the continental United States (Atlantic Basin)
• Camille ranks as the 2nd most intense hurricane to strike the continental US, and resulted in 256 deaths
• The actual maximum sustained winds of the hurricane are not known as Hurricane Camille destroyed all the wind-recording instruments in the landfall area
• Re-analysis data found landfall intensity and peak winds of 150 knots (roughly 175 mph) along the coast, with 900 mb pressure
• A devastating storm tide of 24.6 feet occurred west of our area in Pass Christian, Mississippi.

Hurricane Camille path, timeline of the damage, in-depth description of the event, and also short fact-check of the often-publicized “hurricane party” story can be found in my Hurricane Camille article at Extreme Weather Club website.

Contact @Korina, she will help you with that

ECMWF/CAMS Forecasts of Aerosol Optical Depth for Sunday 23/02 at 1800 UTC (forecast based Sunday 23/02 at 0000 UTC) and for Friday 28/02 at 1500 UTC (forecast based Thursday 27/02 at 0000 UTC)

After desert dust grounded flights in the Canary Islands, forecasts from the Copernicus Atmosphere Monitoring Service (CAMS) can help track where the dust goes next to help both the transport industry and travellers

A large swathe of desert dust from the Sahara swept across the Canary Islands earlier this week, turning skies red and prompting travel chaos – and also causing extreme levels of particulate matter. The Copernicus Atmosphere Monitoring Service (CAMS) reveals how its forecasts help businesses and individuals plan against its impact. CAMS is implemented by the European Centre for Medium-Range Weather Forecasts on behalf of the European Commission.

CAMS is continually monitoring the movement of desert dust over the North Atlantic Ocean and the latest global and regional forecasts of aerosol optical depth and surface particulate matter (PM10) are predicting that it will travel across southern and western Europe in the coming days with impacts on air quality and a number of activity sectors, such as solar power generation across the Iberian peninsula.

By providing these forecasts of the amount and location of desert dust in the atmosphere, CAMS can help scientists, environmental agencies, energy and transportation companies, businesses and individuals make plans and mitigate its effects. It is not only transportation which can be affected by desert dust incidents, but particles from the plumes, which can often travel thousands of kilometres, can have health impacts.

Produced twice a day, forecasts take into account the emission, transport and deposition of the dust by combining satellite observations with a state-of-the-art computer model to accurately predict the amount of dust that is generated by surface winds and how the distribution of the resulting plumes will change over the next five days.

Greater knowledge of dust deposition can help organisations monitor air quality and also susceptible individuals who can change their plans or behaviour, such as not drying clothes outside or parking their car indoor if this is possible for them.

Vincent-Henri Peuch, Director of the Copernicus Atmosphere Monitoring Service, comments: “As we have seen from the incident affecting flights to and from the Canary Islands, dust particles can not only cause huge disruption, but affect people’s health as well. This is why it’s vital to have accurate forecasts and CAMS not only provide these, but work with companies and organisations which can relay this information to the public through smartphone or tablet apps and websites.”

“In fact, CAMS delivers forecasts of dust and of other key air pollutants to leading applications providing air quality information to the public such as Windy, BreezoMeter, Plumelabs and iPhone´s weather app powered by The Weather Channel, ” he added.

Each model has a different update and reference times and it could be confusing what connection does it have to actual update. Before we get to how often are the weather models updated and where to find the update/reference time on Windy, let's see what's the difference between the reference time and the update time.

1. Reference time

Reference time is the time when a model starts a new forecast block. The process consists of the following:

• Initialisation - data are entered into the model, this creates Initial conditions (initialisation time) and then model starts calculating conditions.
• Assimilation - normalisation on data and assembling data for computation.
• Computation - calculating the future atmospheric rates of change in time increments.
• Data extraction - extracting data into regular forecast intervals.
• Data storage - data are stored and written in accessible format.
• Data postprocessing - special postprocessing routines

For example model ECMWF has an update interval 12 hours, that means the first reference time will be 00:00:00Z (Zulu time) and second one 12:00:00Z.

2. Update time

Update time is time between the reference time and the actual update. The whole process of data computation takes approximately from 8 to 9 hours. For example the ECMWF model update times are 07:15:00Z and 19:15:00Z.

When and how often are the weather data updated?

The table below describes when and how often are the weather models updated. All times are in UTC.

Where to find the reference and the update time

While on desktop, to get the reference and the update time, just click the clock icon in bottom right corner of the screen. In app, you have to dig deeper into the menu. See the screenshots below.

@idefix37 Thanks!

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Sprawdzanie kamery pogodowej jest niezbędnym elementem każdej przygody.

A my w Windy jesteśmy zobowiązani do zapewniania coraz lepszych usług osobom takim jak my sami. Dla pilotów, kiterów, poszukiwaczy przygód, alpinistów i wszystkich dusz, które są raczej na zewnątrz niż w centrum handlowym.

Ale nie tylko. W Windy wierzymy, że sprawdzanie kamer internetowych na zewnątrz przed przygodą, na przykład przed lotem małym samolotem, może znacznie zwiększyć poziom bezpieczeństwa. —Ivo

Dołącz do społeczności Windy i udostępnij kamerę internetową publiczności na całym świecie. Możesz przesłać swoją kamerę internetową za pomocą tego formularza (kliknij TUTAJ), odpowiadając na kilka prostych pytań.

Windy sprawdzi twoje zgłoszenie, a gdy kamera internetowa zostanie zatwierdzona, otrzymasz powiadomienie o pomyślnym zgłoszeniu. Twoja kamera internetowa zostanie uruchomiona..

Jeśli zastanawiasz się nad zakupem kamery internetowej lub właśnie kupujesz kamerę internetową, sprawdź poniższą listę obsługiwanych urządzeń.

Rzeczy do rozważenia przed przesłaniem kamery internetowej do Windy

• Twój serwer kamery musi mieć adresy IP pochodzące z zewnątrz na białej liście, ponieważ często występują problemy z serwerami blokującymi nasz adres IP domyślnie
• Przetestujemy twoją kamerę internetową, czy możliwe jest codzienne pobieranie danych, dlatego ważne jest, aby podać nam poprawny adres URL obrazu
• Zapisujemy tylko zdjęcia, które są publicznie dostępne na naszej stronie internetowej z pokazów slajdów (timelapse)
• Sama kamera internetowa może mieć kilka widoków. W zależności od tego, co jest pokazane na obrazie kamery, określa się kategorię i tytuł przypisany do każdej kamery internetowej

Prześlij swoją kamerę internetową

Lista obsługiwanych urządzeń

Producenci z Niemiec, Austrii, Szwajcarii i Francji

• RoundShot (Switzerland)
• Fotowebcam (Austria)
• PanoCloud (Austria)
• SIETEC engineering (Switzerland)
• WLAN Netzerktechnik (Austria)
• Repro Schicker (Switzerland)
• Cre@Weather (France)
• Vision-environment (France)

Polecane marki

• Axix Communications (Sweden)
• Mobotix (Germany)

Oprogramowanie i aplikacje do przesyłania strumieniowego

• Restreamer
• PixWebcam

Następny krok: dodaj kamerę internetową do ulubionych

Poniżej obrazu z kamery internetowej możesz ją ulubić, udostępniając ją w celu szybkiego dostępu (do kamer w ważnych lokalizacjach).

Tropical Cyclone Ferdinand has strengthened and developed an eye, as confirmed in imagery from NASA-NOAA’s Suomi NPP satellite.

The Visible Infrared Imaging Radiometer Suite (VIIRS) instrument aboard Suomi NPP provided a visible image of Ferdinand and showed that an eye opened as the storm continued to intensify. A thick band of powerful bands of thunderstorms circled the eye.

NASA-NOAA’s Suomi NPP satellite found that Tropical Cyclone Ferdinand has developed an eye as it continued to strengthen in the Southern Indian Ocean on Feb. 25, 2020.

On Feb. 25 at 10 a.m. EST (1500 UTC), the Joint Typhoon Warning Center of JTWC noted that Tropical cyclone Ferdinand was located near 15.8 degrees south latitude and 116.5 degrees east longitude, approximately, 413 nautical miles north-northeast of Learmonth, Western Australia.

Ferdinand was moving to the southwest and maximum sustained winds had increased to 90 knots (104 mph/167 kph). That is the equivalent of a Category 2 hurricane on the Saffir-Simpson hurricane wind scale.

JTWC forecasts that Ferdinand will move southwest and strengthen slightly more before starting to weaken. The storm is then expected to curve to the northwest through the Southern Indian Ocean.

Tropical cyclones are the most powerful weather event on Earth. NASA’s expertise in space and scientific exploration contributes to essential services provided to the American people by other federal agencies, such as hurricane weather forecasting.

Rob Gutro
NASA’s Goddard Space Flight Center, Greenbelt, Md.

Related content

• What is a tropical cyclone
• What’s the difference between a hurricane, typhoon, cyclone and tornado
• What's the difference between sustained winds and wind gusts

https://www.windy.com/-Satellite-satellite?satellite,-17.853,105.381,5,internal

The weather event known as the "Calima" came to Canary Islands again on Saturday afternoon. Strong winds blowing out of Western Sahara brought massive dust storm to northern Canaries, leading to cancelation of all flights in and out of Gran Canaria and all flights leaving Tenerife, due to severely impacted visibility.

Gran Canaria, Fuerteventura and Lanzarote are among the most affected locations. To see the extent of the storm, check out the webcams on Windy and the videos shared via Twitter (embeded below).

The storm is so huge it's visible from space as you can see in the satellite loop from 12 a.m. to 6 p.m. UTC today.

https://www.windy.com/-Satellite-satellite?satellite,27.868,-17.325,7,internal

An Arianespace Ariane 5 rocket carrying South Korea's Geostationary Environment Monitoring Spectrometer (GEMS) instrument launches Tuesday, Feb. 18, from the Guiana Space Center in French Guiana.

South Korea's Geostationary Environment Monitoring Spectrometer (GEMS) instrument on the Korean Aerospace Research Institute GEO-KOMPSAT-2B satellite launched into orbit aboard an Arianespace Ariane 5 rocket Tuesday, Feb. 18, from the Guiana Space Center in French Guiana.

A sister instrument to NASA's Tropospheric Emissions: Monitoring of Pollution (TEMPO), GEMS will be the first satellite instrument in a constellation of three satellite instruments that will revolutionize the way scientists observe air quality over significant swaths of the Northern Hemisphere. GEMS will monitor atmospheric gases over Asia hourly during daytime from a geostationary, or fixed, orbit over the equator. This marks a significant leap forward in scientists' ability to monitor air pollution from space.

GEMS is nearly identical to TEMPO, which is scheduled to launch into geostationary orbit in 2022 as a payload on Intelsat 40e. TEMPO will make hourly daytime measurements of air quality over North America. Both GEMS and TEMPO were built by Ball Aerospace in Boulder, Colorado. The European Space Agency's Sentinel-4, currently in development, will observe air quality over Europe.

All three instruments will provide data products that will improve scientists' ability to understand and forecast air quality around the Northern Hemisphere.

Last Updated: Feb. 20, 2020
Editor: Joe Atkinson

https://www.windy.com/-Satellite-satellite?satellite,31.803,-71.543,3,internal

The low-pressure area that has been lingering west-northwest of American Samoa for several days has organized into a tropical depression. NASA’s Terra satellite passed over the Southern Pacific Ocean and provided forecasters with a visible image of Tropical Depression 18P.

On Feb. 21, 2020, the MODIS instrument that flies aboard NASA’s Terra satellite provided a visible image of newly developed Tropical Depression 18P in the Southern Pacific Ocean.

On Feb.21, the Moderate Resolution Imaging Spectroradiometer or MODIS instrument that flies aboard NASA’s Terra satellite provided a visible image of 18P that showed an improved cyclonic circulation along the southern end of a line of deep convection and thunderstorms that extends north-to-south.

At 10 a.m. EST (1500 UTC) on Feb. 21, the Joint Typhoon Warning Center said Tropical Cyclone 18P had maximum sustained winds near 30 knots (34.5 mph/55.5 kph). It was located near latitude 12.9 degrees south and longitude 174.8 degrees west, about 280 nautical miles west-northwest of Pago Pago, American Samoa. 18P is moving to the east-southeast.

The tropical cyclone is forecast to intensify to a tropical storm reaching maximum sustained winds to 45 knots as it passes near American Samoa on Feb. 22. In three days, vertical wind shear is expected to kick in which will cause the storm to dissipate quickly.

In addition to Tropical Cyclone 18P, Tropical Storm Vicky has developed to the southeast of American Samoa. Together, these systems have generated several warnings and watches. On Feb. 21, the National Weather Service (NWS) in Pago Pago has continued the Flash Flood Watch for all of American Samoa through Saturday, Feb. 22.

The NWS forecast page stated, “The active monsoon trough remains across the area with several hybrid lows developing northwest and moving swiftly across the islands through the week. A flash flood watch means that conditions may develop that lead to flash flooding. Flash flooding is a very dangerous situation.”

NASA’s Terra satellite is one in a fleet of NASA satellites that provide data for hurricane research.

Tropical cyclones/hurricanes are the most powerful weather events on Earth. NASA’s expertise in space and scientific exploration contributes to essential services provided to the American people by other federal agencies, such as hurricane weather forecasting.

For updated forecasts from NWS, Pago Pago, visit: https://www.weather.gov/ppg/?lang=english

Rob Gutro
NASA’s Goddard Space Flight Center

Related content

• What is a tropical cyclone
• What’s the difference between a hurricane, typhoon, cyclone and tornado
• What's the difference between sustained winds and wind gusts

https://www.windy.com/-Satellite-satellite?satellite,-22.513,170.640,4,internal

There are two tropical cyclones affecting American Samoa in the South Pacific Ocean on Feb. 21. Tropical Storm Vicky has triggered warnings, while Tropical Cyclone 18P continues to develop. The Global Precipitation Measurement mission or GPM satellite provided a look at the rainfall rates occurring in both storms.

The GPM’s core satellite passed over the South Pacific Ocean on Feb. 20 at 10:20 p.m. EDT (0220 UTC, Feb. 21). GPM found heaviest rainfall (orange) occurring in both Tropical Cyclone 18P and Tropical Storm Vicky, falling at rates of 1 inch (25 mm) per hour. Light rain appears around those heavier rainfall areas and throughout the rest of the tropical cyclones (light blue), falling at less than 0.2 inches (less than 5 millimeters) per hour.

Vicky is located to the southeast of American Samoa and 18P is located to the northwest. American Samoa is a U.S. territory covering seven islands and atolls. The capital city of Pago Pago is located on Tutuila, the largest island.

The National Weather Service (NWS) in Pago Pago issued a Tropical Storm Warning on Feb. 21 for American Samoa, and coastal waters out to 40 nautical miles including National Marine Sanctuary of American Samoa.

In addition, a High Surf Warning remains in effect that states, “Hazardous surfs of at least 20 feet, with locally higher sets, will impact coastal waters, especially west through south facing shores of all islands due to the intensification of Tropical Storm Vicky south of the islands.” A Flash Flood Watch is also in effect for all of American Samoa.

The GPM’s core satellite passed over the South Pacific Ocean on Feb. 20 at 10:20 p.m. EDT (0220 UTC, Feb. 21). GPM found heaviest rainfall occurring in both Tropical Cyclone 18P and Tropical Storm Vicky, falling at rates of 1 inch (25 mm) per hour. Light rain appeared around those areas and throughout the rest of the tropical cyclones, falling at less than 0.2 inches (less than 5 millimeters) per hour.

On Feb. 21 at 4 a.m. EST (0900 UTC), Vicky was located near latitude 15.7 degrees south and longitude 170.7 degrees west, about 84 nautical miles south of Pago Pago, American Samoa. Vicky was moving to the south and had maximum sustained winds 40 knots (46 mph/74 kph).

Vicky is gradually weakening and the Joint Typhoon Warning Center expects it to weaken below tropical cyclone strength before passing near Niue within 24 hours.

Tropical cyclones/hurricanes are the most powerful weather events on Earth. NASA’s expertise in space and scientific exploration contributes to essential services provided to the American people by other federal agencies, such as hurricane weather forecasting.

GPM is a joint mission between NASA and the Japan Aerospace Exploration Agency, JAXA.

For updated forecasts from the NWS in Pago Pago, visit www.weather.gov/ppg

Rob Gutro
NASA’s Goddard Space Flight Center

Related content

• What is a tropical cyclone
• What’s the difference between a hurricane, typhoon, cyclone and tornado
• What's the difference between sustained winds and wind gusts

https://www.windy.com/-Satellite-satellite?satellite,-22.513,170.640,4,internal

It’s been a while since we came across a video from Mischa Gelb’s YouTube channel in which he praised Windy.

A lot of time has passed since then, but recently we’ve remembered Mischa again. That was when we thought it would be great to have a video showing practical use of Windy, shot by someone who is actively using it. So we approached Mischa and to our joy, he agreed.

Yesterday, Mischa has posted the video on his channel, so check it out.

I walk you through the features that I love best about Windy.com. Flying helicopters in the pacific north west you deal with a lot of terrible weather. We are constantly forced to make decisions on the fly as to whether or not we will go flying or if we are going to terminate a flight. We need good accurate weather reports and that’s why I use Windy.com as one tool to support my decision making.

What do you think? Let us know in the comments section. We are more than satisfied.

https://www.windy.com/-Satellite-satellite?satellite,14.945,-92.461,3,internal

Winds outside of Tropical Storm Gabekile are ripping the storm apart. NASA’s Aqua satellite provided a visible image of the storm that showed strong northwesterly wind shear was adversely affecting the storm.

On Feb. 18, 2020, the MODIS instrument that flies aboard NASA’s Aqua satellite provided a visible image of the dissipating Tropical Cyclone Gabekile in the Southern Indian Ocean.

Gabekile formed on Feb. 15 and by the next day, it had rapidly intensified to hurricane-force with maximum sustained winds near 75 knots (86 mph/139 kph), then after encountering wind shear the storm quickly weakened.

In general, wind shear is a measure of how the speed and direction of winds change with altitude. Tropical cyclones are like rotating cylinders of winds. Each level needs to be stacked on top each other vertically in order for the storm to maintain strength or intensify. Wind shear occurs when winds at different levels of the atmosphere push against the rotating cylinder of winds, weakening the rotation by pushing it apart at different levels.

When NASA’s Aqua satellite passed over the Southern Indian Ocean, it provided forecasters with a visible image of the tropical depression. On Feb. 18 at 3:30 a.m. EST (830 UTC), the Moderate Resolution Imaging Spectroradiometer or MODIS instrument that flies aboard NASA’s Aqua satellite showed wispy clouds circled around Gabekile’s low-level center and the bulk of clouds and storms were pushed more than 100 nautical miles southeast of the center.

At 10 a.m. EST (1500 UTC), the Joint Typhoon Warning Center (JTWC) issued the final bulletin on Gabekile. Tropical cyclone Gabekile had maximum sustained winds near 30 knots (34.5 mph/55.5 kph), making it a tropical depression. Gabekile was located near latitude 21.0 degrees south and longitude 75.5 degrees east, about 852 nautical miles south of Diego Garcia. Gabekile was moving to the south-southwest and dissipating.

NASA’s Aqua satellite is one in a fleet of NASA satellites that provide data for hurricane research.

Tropical cyclones/hurricanes are the most powerful weather events on Earth. NASA’s expertise in space and scientific exploration contributes to essential services provided to the American people by other federal agencies, such as hurricane weather forecasting.

Rob Gutro
NASA’s Goddard Space Flight Center

Related content

• What is a tropical cyclone
• What’s the difference between a hurricane, typhoon, cyclone and tornado
• What's the difference between sustained winds and wind gusts

https://www.windy.com/-Satellite-satellite?satellite,-30.524,53.525,4,internal

A "severe" storm - what does it mean exactly? "This is always a very arbitrary choice, so what one person might consider “severe”, another would only call “marginal”. It also depends on where you are, because if you are walking in the mountains, even one flash of lightning can be extremely dangerous. If you are sitting inside your warm, cosy house, it is not so threatening", explains Tomáš Púčik, a Researcher and Senior Trainer at ESSL (European Severe Storms Laboratory) in the interview on the EUMETSAT blog.

Tomáš also gives us the criteria a severe thunderstorm must meet to be classified as a "severe" in the ESSL's severe weather reports. To classify, it has to meet at least one of the following:

• The storm produces some wind-gust damage (if the wind exceeds 90 km per hour)
• There are hailstones larger than 2cm in diameter
• There is a tornado present
• The storm produces flash flooding

What would you classify as a severe storm? Leave a comment below.

Related content

• What's the difference between sustained winds and wind gusts

https://www.windy.com/-Satellite-satellite?satellite,internal

European Space Agency's satellite Aeolus, or, in full, Atmospheric Dynamics Mission Aeolus, will be measuring the impact of the recent Australian bushfires.

Aeolus new special settings

"Starting today, Aeolus will be measuring stratospheric aerosol layers caused by the recent Australian bushfires using new special vertical range bin settings. It will be the first time aerosol particles and Mie winds will be measured by Aeolus from an altitude of up to 29 km", ESA announced today in a twitter thread on Aeolus' official account.

Australian bushfires' smoke detected in Chile

ESA also gives us more insight about the global impact of the Australian wildfires, with smoke detected by station in Chile as an example.

Smoke from the bushfires traveled around the globe and was detected by the Aeolus Cal/Val station at Punta Arenas in Chile. The new measurement will allow experts to determine the speed of the smoke plume and assess Aeolus’ capacity to measure aerosol in high altitudes.

https://www.windy.com/-Active-fires-fires?fires,2020021600,-26.667,128.452,5,internal

Although it is now an “ex-tropical cyclone,” Uesi continues to generate some moderate rainfall, especially in its southern quadrant as it moves toward New Zealand.

The GPM’s core satellite passed over Uesi on Feb. 14 at 2:11 a.m. EST (0716 UTC). GPM found heaviest rainfall (orange) south of center and in bands far south of the center falling at rates of 1 inch (25 mm) per hour. Light rain appears around the entire system (light blue), falling at less than 0.2 inches (less than 5 millimeters) per hour.

The Global Precipitation Measurement mission or GPM satellite provided a look at the rainfall rates on Feb. 14 at 2:11 a.m. EST (0716 UTC). GPM found heaviest rainfall south of center and in bands far south of the center falling at rates of 1 inch (25 mm) per hour. Light rain appears around the entire system, falling at less than 0.2 inches (less than 5 millimeters) per hour.

On Feb. 13 at 2218 UTC (5:18 p.m. EST), the New Zealand Met Service (NZMS) reported “Ex-Tropical Cyclone Uesi was located near Lord Howe Island this morning, and is moving southwest. The system is expected to gradually recurve towards the southeast and move close to the lower South Island during Sunday [Feb.16].”

On Feb. 14, NZMS noted a Heavy Rain Warning is currently in effect for Westland south of Otira. A Heavy Rain Watch is in effect for the remainder of the South Island West Coast and Stewart Island.

NZMS said “A heavy rain warning is in effect for the South Island West Coast and Stewart Island on Sunday [Feb.16] and early Monday [Feb. 17]. Former Tropical Cyclone Uesi is forecast to approach the South Island from the north Tasman Sea overnight Saturday and lie to the west of Fiordland on Sunday.

It should then move southwest from late Sunday onwards and weaken. This system is expected to bring periods of heavy rain to the west and south of the South Island during Sunday and early Monday. Strong to gale north to northwest winds are also expected in parts of the South Island and the lower North Island during this time.”

Tropical cyclones/hurricanes are the most powerful weather events on Earth. NASA’s expertise in space and scientific exploration contributes to essential services provided to the American people by other federal agencies, such as hurricane weather forecasting.

GPM is a joint mission between NASA and the Japan Aerospace Exploration Agency, JAXA.

Rob Gutro
NASA’s Goddard Space Flight Center

Related content

• What is a tropical cyclone
• What’s the difference between a hurricane, typhoon, cyclone and tornado
• What's the difference between sustained winds and wind gusts

https://www.windy.com/-Satellite-satellite?satellite,-40.196,153.633,5,internal

The low-pressure area that had once been Tropical Cyclone Francisco has been lingering in the Southern Indian Ocean since Feb. 6 when it weakened below tropical cyclone status. Since then, Francisco’s remnants moved into an area of warm waters and low wind shear allowing the low-pressure area to re-organize, consolidate and re-form. NASA’s Aqua satellite provided forecasters with a visible image of the zombie storm.

On Feb. 14, the MODIS instrument that flies aboard NASA’s Aqua satellite provided a visible image of re-formed Tropical Cyclone Francisco heading for landfall in east-central Madagascar.

On Feb. 14, the Moderate Resolution Imaging Spectroradiometer or MODIS instrument that flies aboard NASA’s Aqua satellite provided a visible image that showed the storm had re-developed a rounded shape with bands of thunderstorms spiraling into the low-level center. A more rounded shape of a tropical cyclone indicates it is becoming a more organized storm.

Satellite imagery shows a compact system with strong thunderstorms persisting over the low-level circulation. In addition, satellite microwave imagery indicates deep convective banding of thunderstorms over the western semicircle wrapping into the north and east quadrants of a defined low-level circulation center.

On Feb. 14 at 4 a.m. EST (0900 UTC), the Joint Typhoon Warning Center (JTWC) noted that Francisco’s maximum sustained winds powered back up to 40 knots (46 mph/74 kph). Francisco re-formed near latitude 19.0 degrees south and longitude 49.3 east, approximately 114 nautical miles east of Antananarivo, Madagascar. Francisco has tracked southwestward.

Meteo Madagascar issued a Red Vigilance Advisory for heavy rain over central and eastern Madagascar that includes Toamasina, Brickaville, Mahanoro, and the Vatomandry Districts.

The JTWC forecast said the system is expected to make landfall later today over the southeast coast of Atsinanana Region, close to Vatomandry City. That is far to the south of the coastal city of Toamasina. Francisco is expected to weaken steadily as it tracks inland and dissipate sometime on Feb. 15 over land.

NASA’s Aqua satellite is one in a fleet of NASA satellites that provide data for hurricane research.

Tropical cyclones/hurricanes are the most powerful weather events on Earth. NASA’s expertise in space and scientific exploration contributes to essential services provided to the American people by other federal agencies, such as hurricane weather forecasting.

For updated forecasts from Meteo Madagascar, visit www.meteomadagascar.mg

Rob Gutro
NASA’s Goddard Space Flight Center

https://www.windy.com/-Wind-accumulation-gustAccu?gustAccu,-21.596,37.222,5,internal

Related content

• What is a tropical cyclone
• What’s the difference between a hurricane, typhoon, cyclone and tornado
• What's the difference between sustained winds and wind gusts
  

Powerful extratropical cyclone will hit Iceland on Valentine's Day. Iceland will get hurricane-force winds with dangerous wind gusts, possibly exceeding 200 km/h (124 mph).

Icelandic Met Office has updated its warnings:

• Red alert is in effect for Reykjavik - Capital Region, South Iceland, Faxafloi - Southwest Iceland and Southeast Iceland
• Orange alert is in effect for Reykjavik - Capital Region, South Iceland, Faxafloi - Southwest Iceland, Breidafjordur - Westnorthwest Iceland, Westfjords, Northwest Iceland, Northeast Iceland, East Iceland, Eastfjords, Southeast Iceland and Central highlands - Uninhabited part of Iceland
• Yellow alert is in effect for Reykjavik - Capital Region, South Iceland, Faxafloi - Southwest Iceland, East Iceland and Southeast Iceland

(Get the latest warnings at en.vedur.is/alerts)

The North Atlantic is now at its maximum and produces one rapidly intensifying low pressure area after another. These storms then travel east-northeast towards Greenland and Iceland, bringing strong winds, heavy rainfall and snow to Ireland, the UK and continental Europe.

Related content

• Storm Dennis to hit Britain and Europe with very strong winds this weekend
• Storm Dennis – The Meteorologists's Commentary
• What is the difference between tropical and extratropical cyclone

https://www.windy.com/-Satellite-satellite?satellite,62.885,-29.355,5,internal

NASA satellite imagery revealed that vertical wind shear appears to be affecting Tropical Cyclone Uesi in the Southern Pacific Ocean.

On Feb. 13 at 0315 UTC (Feb. 12 at 10:15 p.m. EST), the MODIS instrument that flies aboard NASA’s Aqua satellite provided a visible image of Tropical Cyclone Uesi being adversely affected by vertical wind shear.

On Feb. 13 at 0315 UTC (Feb. 12 at 10:15 p.m. EST), the Moderate Resolution Imaging Spectroradiometer or MODIS instrument that flies aboard NASA’s Aqua satellite provided a visible image of Tropical Cyclone Uesi being adversely affected by vertical wind shear. The image showed that the bulk of clouds were being pushed to the southeast of the center of circulation.

In general, wind shear is a measure of how the speed and direction of winds change with altitude. Tropical cyclones are like rotating cylinders of winds. Each level needs to be stacked on top each other vertically in order for the storm to maintain strength or intensify. Wind shear occurs when winds at different levels of the atmosphere push against the rotating cylinder of winds, weakening the rotation by pushing it apart at different levels. Northwesterly wind shear was affecting Uesi and pushing the bulk of clouds to the southeast of the center.

At 0300 UTC on Feb. 13 (10 p.m. EST on Feb. 12), the Joint Typhoon Warning Center (JTWC) issued the final bulletin on Tropical cyclone Uesi. At that time, Uesi was located near latitude 27.7 degrees south and longitude 161.1 degrees east, about 332 nautical miles southwest of Noumea, New Caledonia. Uesi had maximum sustained winds near 55 knots (63 mph/102 kph). The storm was moving to the south-southwest.

On Feb. 13 at 11:59 pm AEDT (Australia Eastern Time) or 7:59 a.m. EST, the Australian Bureau of Meteorology (ABM) noted “Ex-tropical cyclone Uesi is moving rapidly southwards and will produce destructive wind gusts at Lord Howe Island over the next few hours.” ABM said that the system is expected to maintain an intensity equivalent to a category 2 tropical cyclone as it passes the island. For updates from ABM, visit: http://www.bom.gov.au/.

NASA’s Aqua satellite is one in a fleet of NASA satellites that provide data for hurricane research.

Tropical cyclones/hurricanes are the most powerful weather events on Earth. NASA’s expertise in space and scientific exploration contributes to essential services provided to the American people by other federal agencies, such as hurricane weather forecasting.

Rob Gutro
NASA’s Goddard Space Flight Center

https://www.windy.com/-Satellite-satellite?satellite,-21.600,153.911,5,internal

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