Light to moderate snow will continue into Saturday over the Great Lakes, Central Appalachians, and Northeast. This weekend into next week, a series of atmospheric rivers will bring gusty winds, periods of heavy rain, and mountain snow to northern California and the Pacific Northwest. Colder temperatures are in store for the weekend from the Great Lakes to East Coast. Read More >
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24 Hr. Hazards
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Day 1
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Tornado
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Hail
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Thunderstorm Winds
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Severe Thunderstorms
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Lightning
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Flooding
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Fire Weather (RFTI)
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Fog
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Non Thunderstorm Winds
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Snow & Sleet
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Ice Accumulation
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Wind Chill
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Definition
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No tornado risk.
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Probability of a tornado is less than 10 percent.
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Probability of a tornado is equal to or greater than 10 percent.
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Probability of a tornado is equal to or greater than 30 percent.
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Probability of a tornado is equal to or greater than 45 percent.
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Definition
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No risk of hail.
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Risk of sub-severe hail (less than 1")
or Probability of severe hail (1" or greater): Less than 15% |
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Probability of severe hail (1" or greater): Equal to or greater than 15%
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Probability of severe hail (1" or greater): Equal to or greater than 45%
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Probability of severe hail (1" or greater): Equal to or greater than 60%
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Definition
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No thunderstorm wind risk.
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Risk for sub-severe wind gusts (less than 58 mph)
or Probability of severe wind gusts (58 mph or greater): Less than 15% |
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Probability of severe wind gusts (58 mph or greater): Equal to or greater than 15%
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Probability of severe wind gusts (58 mph or greater): Equal to or greater than 45%
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Probability of severe wind gusts (58 mph or greater): Equal to or greater than 60%
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Definition Severe Thunderstorm Risk Day 2 to 7
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No risk of severe thunderstorms.
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Probability of severe thunderstorms: Less than 15%
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Probability of severe thunderstorms: Equal to or greater than 15%
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Probability of severe thunderstorms: Equal to or greater than 45%
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Probability of severe thunderstorms: Equal to or greater than 60%
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Definition
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No lightning risk
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Thunderstorms expected to be isolated to scattered in coverage.
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Thunderstorms expected to be numerous in coverage.
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Widespread thunderstorms are expected.
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Thunderstorms are expected with nearly continuous cloud to ground lightning strikes in and near thunderstorms.
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Definition
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No Flooding risk.
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Risk of localized flash flooding of small streams and low water crossings, and minor flooding of poor drainage or urban areas.
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Risk of flash flooding of several low water crossings, roads, and small streams.
or Minor River Flooding. |
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Risk of flash flooding of numerous roads, low water crossings, and small streams.
or Moderate river flooding. |
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Risk of widespread flash flooding of low water crossings, roads, and small streams.
or Major river flooding. |
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Definition
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Open burning is usually safe with proper containers and precautions
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Open burning is usually safe with the proper precautions.
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Any open burning is discouraged
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Open burning should not be attempted.>
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Very strong winds, well in excess of Red Flag Criteria combined with moderate to low humidity.
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Definition
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Limited fire weather conditions.
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Elevated fire weather conditions.
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Critical fire weather conditions.
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Significant fire weather conditions.
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Extreme fire weather conditions.
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Definition
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No risk of fog.
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Fog with visibilities less than or equal to 1 mile.
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Fog with visibilities less than or equal to 1/2 mile.
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Fog with visibilities less than or equal to 1/4 mile.
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Fog with near zero visibilities.
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Definition
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Sustained winds < 30 mph
and Wind gusts < 40 mph. |
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Sustained winds 30-34 mph
or Wind gusts 40-49 mph. |
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Sustained winds 35-39 mph
or Wind gusts 50-57 mph. |
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Sustained winds 40-45 mph
or Wind gusts 58-69 mph. |
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Sustained winds > 45 mph
or Wind gusts > 70 mph. |
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Definition
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Maximum Apparent Temperature < 95
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Maximum Apparent Temperature 95 to 104
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Maximum Apparent Temperature 105 to 109
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Maximum Apparent Temperature 110 to 114
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Maximum Apparent Temperature greater than or equal to 115
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Definition
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No snow or sleet.
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Snow and/or sleet with less than 1 inch of accumulation expected.
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Snow and/or sleet with 1 to 5.9 inches of accumulation expected.
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Snow and/or sleet with 6 to 11.9 inches of accumulation expected.
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Snow and/or sleet with greater than or equal to 12 inches of accumulation expected.
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Definition
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No freezing rain or drizzle.
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Very light freezing rain or drizzle with up to a thin glaze,
OR Freezing Fog. |
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Freezing rain or drizzle with accumulation less than 1/4 inch. .
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Freezing rain with accumulation of 1/4 inch to less than 1 inch.
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Freezing rain with accumulation of greater than or equal to 1 inch.
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Definition
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No danger of frost or freeze.
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Patchy frost.
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Frost expected.
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Freeze expected (less than or equal to 32 degrees F for 3 or more hours). .
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Hard freeze (less than or equal to 28 degrees F).
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Definition
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Minimum apparent temperature greater than or equal to 0 degrees F.
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Minimum apparent temperature 0 to -4 deg. F.
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Minimum apparent temperature -5 to -14 deg. F.
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Minimum apparent temperature -15 to -19 deg. F.
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Minimum apparent temperature less than or equal to -20 degrees F .
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The Experimental Enhanced Hazardous Weather Outlook is a decision support service that supports preparedness and response efforts prior to and during hazardous weather. This service provides decision makers with convenient access to potential weather hazard information by graphically depicting the risk of weather hazards out through seven days.
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