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  • The low-level clouds - Summary

    In the previous posts we wrote about all low-level clouds, like Cumulus, Stratocumulus, Stratus and Cumulonimbus. All of the low-level clouds have their base under 2 000 m (6500 ft). Let's recapitulate and add some new information about them. And in the first picture, there are symbols for all of the low level clouds used in meteorology.

    photo: NOAAdesc: Low level clouds symbolslink: cc

    Cumulus is a nice cloud that usually travels alone. Its top is often in the shape of a cauliflower. The base is darker and flat, but the body can be really white. It is created by convection of saturated air and condensation of the water vapour.

    Cumulus humilis is a flattened Cumulus that cause no precipitation. It usually appears in front of a summer anticyclones.

    Cumulus mediocris has its horizontal size quite similar to the vertical size. In spring, Cumulus mediocris can reach the zero isotherm and water drops or little ice crystals can appear. They can fall down in showers. But in summer is the zero isotherms higher and only very rare precipitation is possible.

    Cumulus congestus has its vertical size much bigger than the horizontal. Therefore it is sometimes called towering cumulus. This species quite often grow in the size of Cumulonimbus and so it can signal a storm ahead!

    Cumulus fractus is only rest of a Cumulus after precipitation.

    Stratus is a grey cloud layer with a uniform base that can cause light rain, drizzle or little ice crystals. You can recognize a Sun through this cloud. It can transform into fog and back as it goes to the mountains. It is created by radiative cooling, a transformation from fog or by turbulence. It usually appears in winter in foothills at the back of an anticyclone together with an inversion.

    Stratus nebulosus is a typical Stratus cloud and Stratus fractus is what remains after it.

    Stratocumulus is grey or whitish bigger or smaller groups or layers of clouds. It looks like it consists of many smaller clouds. It usually causes no precipitation, but light rain or snow can occur. Sun is mostly not visible through this cloud type. It is created by a combination of Stratus and Cumulus generation, so by radiative cooling and convection. Stratocumulus can come before bad weather (before a storm, with a warm front,...)

    Stratocumulus stratiformis is a lightly deformed flat layer, Stratocumulus lenticularis looks like a lens with a smooth surface, Stratocumulus castellanus have towers that increases and grows from its base and Stratocumulus volutus is a big rolling cloud.

    Cumulonimbus is a huge and dense cloud with great vertical magnitude. A part of its top is flat and smooth or fibrous that looks like an anvil. Is it a typical precipitation cloud that hides both water drops and ice crystals in it. The precipitation is very intensive, heavy rain and thunderstorms. It is common in summer, in winter is the tropopause low and therefore the Cumulonimbus is smaller but possible. It is created from Cumulus congestus and often goes before a cold front.

    Cumulonimbus calvus is a lower stage of Cumulonimbus. Its top is like cauliflower and sometimes it can spread horizontally and create a shape of a veil or a canvas.

    Cumulonimbus capillatus is a mature stage that has a full anvil formed. It is a cloud of bad weather (thunderstorms).

    photo: fadly halimdesc: low level cloud Cumulus above a boatlink:

    If you want to learn more, see the articles about the species of each types.

    posted in Articles
  • RE: Windy switches between models

    This issue has been fixed on website, but not on iOS app, I confirm.... or not yet.

    posted in Your Feedback and Suggestions
  • Aggregator Open Data Licence (AODL)

    Aggregator Open Data Licence (AODL) is licence that covers the situation, where multiple users share their data, and the single subject aggregates them, stores them, use them and shares them based on this licence. Typical use case is for example owner of Personal Weather Station, that decides do share his real time observation data with others.

    To be finalized later

    Version: 1.0

    posted in Frequently Asked Questions
  • RE: Could we have data for more pressure levels ?

    @ivo The meteogram data that are part of API contain RH in levels. In a future we can extend API to release more data but now we are finishing some other projects.

    posted in Windy Plugins
  • RE: Could we have data for more pressure levels ?

    @vicb We are quite busy developing other stuff.

    posted in Windy Plugins
  • RE: No Data

    @Mconniff I see, you mean Radar...

    The "no data" hatched area means that for a particular time (indicated by the time-slider) there was no data provided by the radar. Which means, our connection to them is OK, but they were not sending/transmitting any data for that particular time period.

    As you can see on the screenshot, each radar works on its own, so the situation may be different even within one country:

    Screenshot 2019-03-15 at 09.41.18.png

    posted in Your Feedback and Suggestions
  • RE: No Data

    Hi @Mconniff , please could you be more specific? What weather layer? What device, OS, etc.? Any screenshot? Thank you!

    posted in Your Feedback and Suggestions
  • RE: White list - fire wall

    Just port 80

    posted in Your Feedback and Suggestions
  • RE: How many days out for forecast?

    Hello @tricevi , thanks for your message and all the details. What device are you and your friend using? And what forecast model(s)? Could you please send a screenshot?

    Please note, there is a difference between the 10-day animation of (almost) any map layer (it is the timeline with play/pause button at the bottom of the screen), and the forecast detail for a specific location (Basic / Wind / Meteogram / Airgram / Waves; 2,5 to 6-day forecast depending on the model + "Compare" multimodel which is for 2,5 to 5 days).

    posted in Your Feedback and Suggestions