What does that mean?
Ever wonder what the weather man really means by scattered clouds? I found at the National Weather Service site...
PRECIPITATION
Technically, the Probability of Precipitation (often referred to as a "POP") is defined as the likelihood of occurrence (in percent) of a measurable amount of liquid precipitation (or water equivalent of frozen precipitation) during a specified period of time at any given point in the forecast area.
The following are precipitation probabilities used by the National Weather Service.
POP Percentage | Expression/Uncertainty | Areal Qualifiers |
0 Percent | None | None |
10 Percent | ISOLATED or None | ISOLATED or None |
20 Percent | SLIGHT CHANCE | ISOLATED |
30-50 Percent | CHANCE | SCATTERED |
60-70 Percent | LIKELY | NUMEROUS |
80-100 Percent | (none) | OCCASIONAL or PERIODS OF |
SKY CONDITION
Forecasts normally include a sky condition unless it is implied from another part of the forecast. Below are terms we use to describe the sky condition:
Descriptive Term | Predominant or Average Cloud Cover |
CLEAR or SUNNY | No clouds |
MOSTLY SUNNY or MOSTLY CLEAR | 1/8 to 2/8 clouds |
PARTLY CLOUDY or PARTLY SUNNY | 3/8 to 5/8 clouds |
MOSTLY CLOUDY (sometimes CONSIDERABLE CLOUDINESS) | 6/8 to 7/8 clouds |
CLOUDY | 8/8 clouds |
Also used: INCREASING CLOUDS DECREASING CLOUDS |
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