Posts made by Gkikas LGPZ

@Paolo-Saracino
giorni alcionii
halcyon days! (=Period of calm during the winter, when storms do not occur.)

http://www.treccani.it/enciclopedia/alcione_res-fff5dd4e-1d22-11de-bb24-0016357eee51/

@nickwilder
Please read (if you have the patience)
https://community.windy.com/topic/4831/aviation-winds-aloft-on-airgram
https://community.windy.com/topic/5014/windspeed-and-direction-different-heights

@Homer1959
from the reference time

@Homer1959
https://community.windy.com/topic/3361/description-of-weather-overlays
Rain accumulation: Total rain accumulation in the next hours or days. It's being deduced from the reference time (see 'About these data' section in the Quick Settings Menu).

Ohh ! not again!

Mauna Loa Observatory measured 415.79 parts per million of CO2 in the atmosphere on January 21, the highest ever daily average.

The UK's Met Office forecasts that the annual average CO2 concentration at Mauna Loa will be 414.2 ± 0.6 ppm. For the first time, monthly CO2 levels will exceed 415 ppm (during spring and summer) and will remain above 410 ppm for the entire year. Forecast monthly mean CO2 will peak at 417.4 ppm in May.

The Met Office forecasts that, at global level, the annual rise in CO2 concentration is expected to be relatively large and similar to last year's due to 2020 due to emissions from fossil fuel burning, land use change and cement production and a continuation of the temporary weakening of the land carbon sink.

This accelerates this year's annual CO2 rise by about 10%, with between 1% and 2% due to 2019/20 Australian bushfires.

Monthly Average Mauna Loa CO2

https://www.windy.com/-PM2-5-pm2p5?cams,pm2p5,25.879,-46.758,3,internal

2019 was an eventful year for global weather - see how some of the more severe storms looked from space in this brand new "Year of Weather" video from EUMESAT.

This visualisation, comprised of imagery from the geostationary satellites of EUMETSAT, NOAA, the CMA and JMA, combined with data from EUMETSAT's polar orbiting Metop satellites, shows an entire year of weather across the globe throughout 2019.

This ultra-high resolution (4k) visualisation has been produced by EUMETSAT's data visualisation team and is composed of a satellite infrared data layer, provided by MeteoFrance, superimposed over NASA's 'Blue Marble Next Generation' ground maps, which change with the seasons.

https://www.windy.com/-Satellite-satellite?satellite,22.350,-55.371,3,internal

@TZ
Thanks a lot!

... Alternatively
I think it would be a great idea to customize the color scale for INFRA.

also https://community.windy.com/topic/10107/new-satellite-map-enhancements/34

https://community.windy.com/topic/8820/windy-launches-satellite-layer/23

Ιf there was no limit, I could compute the cloud top height
(for low and medium clouds).

@masonleandro
The definitions I gave (2,5 years ago) come from UK's Metoffice as I mention.
I never said that this is the definition used by Windy.
In any case, I think there is no contradiction.
7000 ft = 2135m (circa 2000m) and 18000 ft = 5500 m.

For more precise definitions (for ECMWF model)
"... cloud layers are assigned as:
High-level cloud cover (HCC). - Cloud integrated from top of the atmosphere down to 450hPa*.
Medium-level cloud cover (MCC). - Cloud integrated from 450hPa* down to 800hPa*.
Low-level cloud cover (LCC). - Cloud integrated from 800hPa* down to the surface.

source: https://confluence.ecmwf.int/display/FUG/Clouds

@Paolo-Saracino
Grazie Paolo, great article!
Lake effect snow is also common across the Great Lakes region (USA)
when cold air from Canada, moves across the open waters of the Great Lakes.

Wind direction is a key component in determining which areas will receive lake effect snow. Heavy snow may be falling in one location, while the sun may be shining just a mile or two away in either direction. The physical geography of the land and water is also important.

credits: https://www.weather.gov/safety/winter-lake-effect-snow

Where is the donation feature?

@jimmywuster

@Matierk

etc etc

@oleini
Why are you sending many times the same message with different user names?

@oleini
Do you think is easier to read this

instead of this ?

@blahdi

1. INFRA+ sattellite images, show brightness temperatures of cloud tops.
   With the picker you can see the temperature, if it is less than -33C (-27 F).
2. By default, Windy "colorize" temps less than -27F (dark blue).

@TZ said in Upper air temperatures:

the 250hPa layer is missing in sounding

I think you solved this problem! 250 hPa data in sounding are not missing anymore!
Thank you!