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The probability of precipitation can also be expressed using descriptive terms instead of numerical values. For instance, the NWS might describe a precipitation forecast with terms such as "slight chance" meaning 20% certainty and "scattered" meaning 30–50% areal coverage. [10] The precise meaning of these terms varies. [11]
= 4.1 R −0.21 mm −1 (equivalent to 41 R −0.21 cm −1 in the reference [4]), R being the rainrate in stratiform precipitation in millimeters per hour; D = raindrop diameter in mm The units of N 0 are sometimes simplified to cm −4 but this removes the information that this value is calculated per cubic meter of air.
reliable probabilities of binary events, e.g. probability of precipitation and (severe) thunderstorms, reliable probabilities of categorical events, e.g., probability of clear, scattered, broken or overcast skies. These points, while greatly desired by forecasters, do come at a price.
The theoretical return period between occurrences is the inverse of the average frequency of occurrence. For example, a 10-year flood has a 1/10 = 0.1 or 10% chance of being exceeded in any one year and a 50-year flood has a 0.02 or 2% chance of being exceeded in any one year.
Precipitation is a major component of the water cycle, and is responsible for depositing most of the fresh water on the planet. Approximately 486,000 cubic kilometres (117,000 cu mi) [2] of water falls as precipitation each year; 373,000 cubic kilometres (89,000 cu mi) of it over the oceans. [2]
Gareth Patterson/Penske Media via Getty. Reyna Roberts at the 59th Academy of Country Music Awards from Ford Center at The Star in Frisco, Texas on May 16, 2024
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