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In April 2012, AccuWeather drastically shortened the range of their publicly available historical data from 15 years to 1 year. They also began increasing the range of their forecast from 15 days to 25 days, 45 days, and (by 2016) to 90 days.
A multi-day period of significant tornado activity occurred across the Midwestern United States and the Mississippi Valley as well as an additional tornado in the Canadian province of Quebec from May 19–27, 2024.
ECMWF aims to provide accurate medium-range global weather forecasts out to 15 days and seasonal forecasts out to 12 months. [12] Its products are provided to the national weather services of its member states and co-operating states as a complement to their national short-range and climatological activities, and those national states use ECMWF's products for their own national duties, in ...
Weather is the state of the atmosphere, describing for example the degree to which it is hot or cold, wet or dry, calm or stormy, clear or cloudy. [1] On Earth, most weather phenomena occur in the lowest layer of the planet's atmosphere, the troposphere, [2] [3] just below the stratosphere. Weather refers to day-to-day temperature ...
Global Forecast System. An example of a forecast product from the GFS, in this case a 96-hour forecast of 850 mb geopotential height and temperature. The Global Forecast System ( GFS) is a global numerical weather prediction system containing a global computer model and variational analysis run by the United States' National Weather Service (NWS).
Pre-season forecasts. On December 11, 2023, Tropical Storm Risk (TSR) released its extended range forecast for the 2024 season, predicting an above-average season with 20 named storms, 9 hurricanes and 4 major hurricanes.
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The forecast was maintained through the next two days. The risk area was expanded into northeastern Texas on April 22 and later extended to include the possibility of severe weather on April 27. [22] [23]