If the radar animation of the last hours shows local thunderstorms or precipitation cells forming and disappearing in an irregular manner, then the forecast is not vey accurate. The interactive map makes it easy to navigate. The forecast works very well when weather fronts or large organized precipitation structures are moving regularly, without disappearing or being created. Map time: Fri 01:32:41 GMT-0800 (Pacific Standard Time) Weather Underground’s WunderMap provides interactive weather and radar Maps for weather conditions for locations worldwide. See the latest United States RealVue weather satellite map, showing a realistic view of United States from space, as taken from weather satellites. Real weather is more complex than just the displacement of existing precipitation cells. Longer forecasts are not possible, as new precipitation cells are developing or existing ones are disappearing within a short time. This so called precipitation nowcast is the most accurate precipitation forecast possible but the forecast horizon is limited to about an hour. The rain/snow forecast is computed by estimating the movement of precipitation cells observed by radar and extrapolating this movement into the future. United States: How accurate is the radar based forecast? Moreover, some countries do not operate a weather radar network, and in those countries satellite data is used to estimate rainfall, which is less accurate than a realtime weather radar. Note that lightning is not shown on the forecast, as it cannot be predicted. Light blue indicates drizzle, blue a medium intensity, and red and yellow indicate very strong precipitation, usually associated with thunderstorms.Ĭurrent lightning strikes are marked with small orange dots on the map (Europe only). The major advantage of 4DVAR is the use of full model dynamics and physics to assimilate multiple-time-level observation data. The different colours indicate the intensity of rainfall or snowfall. Author(s): Xu, J Gao, X Sorooshian, S Xiao, Q Abstract: The impact of assimilating rainfall derived from radar and satellites on rainstorm forecasts over the Southwestern United States is discussed. The radar map is updated every 5 minutes with a new radar observation. The weather radar ( United States) shows where it is currently raining or snowing.
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