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The greatest amount of precipitation that fell in a 24-hour period was 9.35 in (237.5 mm) on August 13–14, 1987. That event also set the records for heaviest 6 and 12 hour rainfall amounts and contributed to August 1987's record rainfall. The heaviest calendar day snowfall was 18.6 in (47.2 cm), again at O'Hare, on January 2, 1999. [16]
Average yearly precipitation for Illinois varies from 48 inches or 1,220 mm at the southern tip to 35 inches or 890 mm in the northern portion of the state. Normal annual snowfall exceeds 38 inches or 0.97 m in Chicago, while the southern portion of the state normally receives less than 14 inches or 0.36 m. [1]
A QPF will be created when precipitation amounts reaching a minimum threshold are expected during the forecast's valid period. Valid periods of precipitation forecasts are normally synoptic hours such as 00:00, 06:00, 12:00 and 18:00 GMT. Terrain is considered in QPFs by use of topography or based upon climatological precipitation patterns from ...
See weather forecast map. The National Weather Service's forecast for Saturday, Dec. 28, 2024. ... Flooding from heavy rainfall poses a threat in northern California and southern Oregon this ...
Some metro east areas got more than 6 inches of rain in 24 hours. Here’s what the National Weather Service St. Louis was reporting as of Tuesday morning. ... (in the last 12 hours) Mascoutah: 5. ...
Last 24 hours of rainfall over the lower 48 - National Weather Service rainfall network; Rainfall forecasts for the lower 48; Current map of forecast precipitation over the United States during the next three hours.
Local on the 8s (or the Local Forecast) is a program segment that airs on the American network The Weather Channel.It provides viewers with information on current and forecasted weather conditions for their respective area; a version of this segment is also available on the channel's national satellite feed that features forecasts for each region of the United States.
During May 1894 the Chicago Weather Bureau was given a new forecast area extending from the Great Lakes region all the way to the Rocky Mountains. [2] The current National Weather Service Chicago is located in Romeoville and is in charge of issuing local forecasts and weather warnings for the Chicago area . [ 2 ]