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Marine Thunderstorm Wind Threat Level
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Threat Level Descriptions
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Extreme
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"An Extreme Threat to Life and Property Aboard Small Marine Craft from Wind Gusts Associated with Thunderstorms."
Within 12 miles of a location, a moderate likelihood or greater (16% probability or greater) of very severe/violent thunderstorm wind gusts (64 knots or greater).
AND/OR...a high likelihood or greater (26% probability or greater) of severe thunderstorm wind gusts (between 50 knots and 63 knots).
AND/OR...a very high likelihood (36% or greater) of strong thunderstorm wind gusts (between 34 and 49 knots).
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High
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"A High Threat to Life and Property Aboard Small Marine Craft from Wind Gusts Associated with Thunderstorms."
Within 12 miles of a location, a low likelihood (6% to 15% probability) of very severe/violent thunderstorm wind gusts (64 knots or greater).
AND/OR...a moderate likelihood (16% to 25% probability) of severe thunderstorm wind gusts (between 50 knots and 63 knots).
AND/OR...a high likelihood (26% to 35% probability) of strong thunderstorm wind gusts (between 34 and 49 knots).
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Moderate
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"A Moderate Threat to Life and Property Aboard Small Marine Craft from Wind Gusts Associated with Thunderstorms."
Within 12 miles of a location, a very low likelihood (2% to 5% probability) of very severe/violent thunderstorm wind gusts (64 knots or greater).
AND/OR...a low likelihood (6% to 15% probability) of severe thunderstorm wind gusts (between 50 knots and 63 knots).
AND/OR...a moderate likelihood (16% to 25% probability) of strong thunderstorm wind gusts (between 34 and 49 knots).
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Low
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"A Low Threat to Life and Property Aboard Small Marine Craft from Wind Gusts Associated with Thunderstorms."
Within 12 miles of a location, a very low likelihood (2% to 5% probability) of severe thunderstorm wind gusts (between 50 knots and 63 knots).
AND/OR...a low likelihood (6% to 15% probability) of strong thunderstorm wind gusts (between 34 and 49 knots).
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Very Low
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" A Very Low Threat to Life and Property Aboard Small Marine Craft from Wind Gusts Associated with Thunderstorms."
Within 12 miles of a location, a very low likelihood (2% to 5% probability) of strong thunderstorm wind gusts (between 34 and 49 knots).
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Non-Threatening
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" No Discernable Threat to Life and Property Aboard Small Marine Craft from Wind Gusts Associated with Thunderstorms."
Within 12 miles of a location, environmental conditions do not support the occurrence of strong to severe wind gusts from thunderstorms.
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| Note: Since small craft are vulnerable to rapid, gusty increases in wind speed, mariners should not allow strong to severe thunderstorms to get between them and safe harbor.
Strong Wind Gusts - Thunderstorm wind gusts between 34 knots and 49 knots.
Severe Wind Gusts - Severe thunderstorm wind gusts between 50 knots and 63 knots.
Very Severe/Violent Wind Gusts - Severe thunderstorm wind gusts between 64 knots and 79 knots, but in worse case situations may exceed 80 knots.
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