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Probability of precipitation
| pop |
descriptive term |
| 0% |
not mentioned |
| 10% |
no mention or slight chance/isolated |
| 20% |
slight chance/isolated |
| 30-50% |
chance/scattered |
| 60-70% |
likely / periods / occasional / frequent / areas / numerous |
| 80-100% |
snow/rain |
Sky condition
| sky cover (tenths) |
descriptive term |
| 9/10 - 10/10 |
cloudy |
| 7/10 - 8/10 |
mostly cloudy / considerable cloudiness |
| 3/10 - 6/10 |
partly cloudy/partly sunny |
| a few clouds |
mostly clear |
| 1/10 - 3/10 |
mostly sunny |
| 0/10 - 1/10 |
clear or sunny |
| less than 4/10 opaque clouds |
fair - (pleasant weather conditions i.e. no extreme condition of
visibility, wind, or temperature) |
Winds
| sustained wind speed |
descriptive term |
| 0 - 5 mph |
light, or light and variable |
| 5-15 mph |
none used |
| 15-25 mph |
breezy (usually for mild weather)
brisk (usually for cold weather) |
| 20-30 mph |
windy |
| 30-40 mph |
very windy |
| 40 mph or greater |
strong, dangerous, damaging - high wind warning required. |
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5324 Tri-Hill Frontage Road
Great Falls, MT 59405-4933
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