| Probability of Snow Crust Break |
| Wind Speed (knts) |
Probability |
| -- |
-- |
Output within each cell is the probability of observing visibility less than 1/2 SM due to blowing snow, and equates to the anticipated coverage of blizzard visibility. Based on research of past events, this probability is well correlated to the coverage of blizzard visibility. Note: the probability displayed is not the probability for advisory or warning impacts
| Impact Level |
| None |
Minimal Impacts |
| Drifting Snow |
Drifting Snow |
| Drifting/Blowing Snow |
Mainly Drifting Snow - Some Blowing Snow |
| Low |
Sporadic/Brief/Isolated Whiteout Conditions |
| Medium |
Occasional/Periods of/Scattered Whiteout Conditions |
| High |
Frequent/Constant/Widespread Whiteout Conditions |
| Headline - Wx Grids |
| Model Output |
Headline |
Wx Grid |
| 1% |
Nothing |
Patchy |
| 2-24% |
Nothing |
Patchy |
| 25-49% |
Nothing (Advisory if Significant Drifting) |
Areas |
| 50-79% |
Advisory (Warning if Significant Drifting) |
Def |
| 80-100% |
Warning |
Def [1/4 SM] |
For real-time observations and table, visit
this page.
| Constant Temperature = |
No Falling Snow (Snow Age) |
| Wind Speed |
Falling Snow |
0-3 hrs |
3-6 hrs |
6-12 hrs |
12-24 hrs |
24 + hrs |
| -- |
-- |
-- |
-- |
-- |
-- |
-- |
| -- |
-- |
-- |
-- |
-- |
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-- |
| -- |
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| -- |
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-- |
| -- |
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| -- |
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| -- |
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| -- |
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| -- |
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| -- |
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| -- |
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| -- |
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| -- |
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| -- |
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| -- |
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-- |
| Constant Wind Speed = |
No Falling Snow (Snow Age) |
| Temperature |
Falling Snow |
0-3 hrs |
3-6 hrs |
6-12 hrs |
12-24 hrs |
24 + hrs |
| -- |
-- |
-- |
-- |
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| -- |
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-- |
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