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  2. Probability of precipitation - Wikipedia

    en.wikipedia.org/wiki/Probability_of_precipitation

    The NWS provides hourly forecasts. [4] These forecasts include PoP over a given twelve-hour period (i.e. daytime vs night) which indicate a PoP if the given conditions at the start of the twelve-hour period hold for the next twelve-hours. They also include hour-to-hour forecasts, which is the PoP for that given hour.

  3. Prognostic chart - Wikipedia

    en.wikipedia.org/wiki/Prognostic_chart

    The global models are run outwards to varying times into the future. The UKMET Unified Model is run six days into the future, [16] the European Centre for Medium-Range Weather Forecasts model is run out to 10 days into the future, [17] while the Global Forecast System model run by the Environmental Modeling Center is run 16 days into the future ...

  4. Numerical weather prediction - Wikipedia

    en.wikipedia.org/wiki/Numerical_weather_prediction

    The ENIAC main control panel at the Moore School of Electrical Engineering operated by Betty Jennings and Frances Bilas. The history of numerical weather prediction began in the 1920s through the efforts of Lewis Fry Richardson, who used procedures originally developed by Vilhelm Bjerknes [1] to produce by hand a six-hour forecast for the state of the atmosphere over two points in central ...

  5. History of numerical weather prediction - Wikipedia

    en.wikipedia.org/wiki/History_of_numerical...

    Even with the increasing power of supercomputers, the forecast skill of numerical weather models only extends to about two weeks into the future, since the density and quality of observations—together with the chaotic nature of the partial differential equations used to calculate the forecast—introduce errors which double every five days ...

  6. Weather forecasting - Wikipedia

    en.wikipedia.org/wiki/Weather_forecasting

    Microsoft's Aurora system offers global 10-day weather and 5-day air pollution (CO 2, NO, NO 2, SO 2, O 3, and particulates) forecasts with claimed accuracy similar to physics-based models, but at orders-of-magnitude lower cost. Aurora was trained on more than a million hours of data from six weather/climate models. [83] [84]

  7. AccuWeather - Wikipedia

    en.wikipedia.org/wiki/AccuWeather

    They also began increasing the range of their forecast from 15 days to 25 days, 45 days, and (by 2016) to 90 days. These hyper-extended forecasts have been compared to actual results several times and shown to be misleading, inaccurate, and sometimes less accurate than simple predictions based on National Weather Service averages over a 30-year ...

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