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The Quantitative Precipitation Forecast (abbreviated QPF) is the expected amount of liquid precipitation accumulated over a specified time over a specified area. [119] A QPF will be specified when a measurable precipitation type reaching a minimum threshold is forecast for any hour during a QPF valid period.
The quantitative precipitation forecast (abbreviated QPF) is the expected amount of melted precipitation accumulated over a specified time period over a specified area. [1] A QPF will be created when precipitation amounts reaching a minimum threshold are expected during the forecast's valid period.
Environment Canada reports a chance of precipitation (COP) that is defined as "The chance that measurable precipitation (0.2 mm of rain or 0.2 cm of snow) will fall on any random point of the forecast region during the forecast period." [7] The values are rounded to 10% increments, but are never rounded to 50%. [8]
Here are rainfall amounts, in inches, from the last 24 hours (unless otherwise noted) by locality, according to National Weather Service St. Louis: Illinois locations. Belleville: 6.23, 6.33 ...
A winter storm will barrel across the US today and Monday, bringing up to a foot of snow along with ice and rain to millions. Some 70 million people are under some kind of weather alert this ...
Heavy mixed precipitation, with ice accumulations of up to a half inch and higher amounts expected near the I-64 corridor. Additional snow accumulations of one to two inches on Monday, mainly in ...
During El Niño events, precipitation averages about 10 percent above normal, while La Niña events lead to precipitation amounts which average close to 10 percent below normal. [79] Pago Pago harbor in American Samoa has the highest annual rainfall of any harbor in the world. [80] This is due to the nearby Rainmaker Mountain. [80]
A winter snow storm is expected to begin late Sunday night and continue through Monday. The D.C. region could see five to twelve inches of snow, possibly mixed with sleet, and freezing rain ...