Description of weather overlays
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@c4551u5
See information about Snow depth forecast by ECMWF:
https://charts.ecmwf.int/products/medium-snow-sic?base_time=202311250000&projection=opencharts_central_europe&valid_time=20231125000
As explained by ECMWF, below 10 cm there is some inaccuracy.
I agree it is weird as the density is increased after the snowfall. It should decrease.
It shows it is not arithmetic :) -
The freezing altitude layer, how does that work? I am often looking at ski weather and on those sites, the current freezing altitude (frostgrenze in German, vorstgrens in Dutch) is at around 2000 meters. Yet the 'freezing level' layer shows values of 2500 to even 1900 meters for those locations, even though the current temperatures there are much higher.
Am I misinterpreting what the freezing altitude layer actually is or does? Or is the data faulty?
Thanks!
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Here is what the ECMWF says about this parameter:
“ This chart [of the freezing level] represents the height of the air temperature 0°C isotherm.
The chart shows the highest altitude where the temperature passes from positive to negative values with increasing height. It does not show zero degree levels in an inversion where temperatures pass from negative to positive values with increasing height.
The altitude of the 0°C isotherm allows some estimation of the level where snow melts to rain. It is also important in aviation, especially for smaller aircraft, as accumulation of ice on the airframe can occur at altitudes near to this level”.Furthermore, this temperature is that of the air mass in free atmosphere but not at ground level. Therefore, there may be a certain deviation from the temperature observed locally, particularly in case of temperature inversion.
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Hello! I couldn’t find a description, where I can read about the Thunderstorm layer from ECMWF weather model, thanks!
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@Mary_G
You have it in your screenshot.
This layer represents the forecast by the ECMWF model of the number of lightning strikes per sq.kilometer for a day.
I/km2 means lightning per sq.kilometer.
See more information:
https://codes.ecmwf.int/grib/param-db/?id=228057 -
@idefix37 thank you! on my screenshot - there is description: "number in one day", it is a little bit confusing
Thunderstorms - defined as number of lighting flashes in the area of one square kilometer, in one day.
but it clears now, thanks - Note that this parameter has units of flashes per square kilometre per day. Conversion of this parameter to units of flashes per 100 square kilometres per hour can give values that are easier to interpret.
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Под каждым слоем как в цивилизованном мире нету краткого описания в контекстных меню?)
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Here’s a concise, human-readable summary of the features:
Radar, Lightning: Displays weather radar and real-time lightning strikes, using different data sources but sharing a timeline for animated playback.
Wind: Shows average wind speed 10 meters above ground, with gusts computed for the last 3 hours and a 10-day accumulation map for maximum wind intensity.
Rain, Thunder: Displays rain/snow accumulation for the last 3 hours with a lightning density forecast.
Rain/Snow Accumulation: Forecasts total rain or snow accumulation over the next hours or days.
Snow Depth: Predicts snow depth, influenced by various factors like terrain and urban areas.
Precipitation Type: Indicates types of precipitation (rain, snow, sleet, etc.).
Thunderstorms: Counts lightning flashes per square kilometer per day.
Temperature: Shows temperature 2 meters above ground.
Dew Point: Temperature at which air moisture forms dew.
Humidity: Relative humidity 2 meters above ground.
Freezing Altitude: Altitude where temperature hits 0°C.
Wet Bulb Temperature: Lowest temperature via evaporative cooling, critical at 35°C.
Solar Power: Amount of solar radiation reaching the Earth's surface.
UV Index: Measures the sunburn-producing UV radiation strength.
Clouds: Shows cloud cover at different altitudes and their rain/snow accumulation.
Fog: Displays fog conditions, influenced by local factors.
Visibility: Measures how far objects or light can be clearly seen.
CAPE Index: Indicates potential energy for storm formation.
Thermals: Shows thermal activity and cumulus cloud occurrence.
Waves: Significant wave height and period, combining swell and wind waves.
Sea Temperature: Estimates sea surface temperature.
Currents: Displays surface sea currents.
Tidal Currents: Tidal movements influenced by Earth, sun, and moon.
CO Concentration: Carbon monoxide levels in the air.
Dust Mass: Concentration of dust particles in the air.
SO2 Mass: Sulfur dioxide concentration, often from volcanic activity or fossil fuels.
Ozone Layer: Total column of ozone, affecting UV radiation.
Soil Moisture: Amount of water available to plants in the soil.
Moisture Anomaly: Deviation of soil moisture from average levels.
Drought Intensity: Compares current soil water with historical levels for drought assessment.
Pressure: Atmospheric pressure at sea level.
Weather Warnings: Alerts from national weather agencies.
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Hi Moderator, i wanna ask you something.. can i get the raw data of precipitation prediction or nc file?
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s there a description of Wind Accumulation? Seems like it would follow this description from above
"Rain accumulation: Total rain accumulation in the next hours or days."
But I am seeing it change for the path of Hurricane Florence southward along the South Carolina and Georgia coasts, which matches the spaghetti model's adjustments I've seen as well.
Is Wind Accumulation an indicating factor in those models I guess? Also is there a plan to add those as a layer to the Windy interface? -
Also is there a plan to add those as a layer to the Windy interface?
Wind accumulation is already available as a layer in Windy.
Layer w/customized colors
Wind accumulation is the max gusts field during a period of time (days / hours) as predicted by a weather model.
