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Over 8,700 volunteers from the fifty states and all territories report at least daily a variety of weather conditions such as daily maximum and minimum temperatures, 24-hour precipitation totals, including snowfall, and significant weather occurrences throughout a day that are recorded via remarks in observer logs.
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The Weather Prediction Center (WPC), located in College Park, Maryland, is one of nine service centers under the umbrella of the National Centers for Environmental Prediction (NCEP), a part of the National Weather Service (NWS), which in turn is part of the National Oceanic and Atmospheric Administration (NOAA) of the U.S. Government.
The most rainfall in 24 hours was 6.83 inches (173 mm) on January 21, 1967. Although snow rarely falls in St. Helena, there is an annual average snowfall of 0.2-inch (5.1 mm). The most snowfall in one month was 4.0 inches (100 mm), recorded in January 1974 and again in March 1976.
As the graph shows, requests put in during the morning see a 5-hour median response time; wait until the end of the afternoon, and you're looking at a response time closer to 17 hours.
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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 ...
In the United States, the National Weather Service has standardized its measurements on the Class A evaporation pan, a cylinder with a diameter of 47.5 in (120.7 cm) that has a depth of 10 in (25 cm). The pan rests on a carefully leveled, wooden base and is often enclosed by a chain link fence to prevent animals drinking from it.