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Waterspout 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 Waterspouts."
Within 12 miles of a marine location, a moderate likelihood or greater (16% probability or greater) of a significant tornadic waterspout. See description below.
AND/OR...a high likelihood or greater (26% probability or greater) of a tornadic waterspout. See description below.
AND/OR...a very high likelihood (36% or greater) of a waterspout. See description below.
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High
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"A High Threat to Life and Property Aboard Small Marine Craft from Waterspouts."
Within 12 miles of a marine location, a low likelihood (6% to 15% probability) of a significant tornadic waterspout. See description below.
AND/OR...a moderate likelihood (16% to 25% probability) of a tornadic waterspout. See description below.
AND/OR...a high likelihood (26% to 35% probability) of a waterspout. See description below.
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Moderate
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"A Moderate Threat to Life and Property Aboard Small Marine Craft from Waterspouts."
Within 12 miles of a marine location, a very low likelihood (2% to 5% probability) of a significant tornadic waterspout. See description below.
AND/OR...a low likelihood (6% to 15% probability) of a tornadic waterspout. See description below.
AND/OR...a moderate likelihood (16% to 25% probability) of a waterspout. See description below.
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Low
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"A Low Threat to Life and Property Aboard Small Marine Craft from Waterspouts."
Within 12 miles of a marine location, a very low likelihood (2% to 5% probability) of a tornadic waterspout. See description below.
AND/OR...a low likelihood (6% to 15% probability) of a waterspout. See description below.
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Very Low
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" A Very Low Threat to Life and Property Aboard Small Marine Craft from Waterspouts."
Within 12 miles of a marine location, a very low likelihood (2% to 5% probability) of a waterspout. See description below.
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Non-Threatening
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" No Discernable Threat to Life and Property Aboard Marine Vessels from Waterspouts."
Within 12 miles of a marine location, environmental conditions do not support waterspouts.
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| Note: Waterspouts form over (or move across) the coastal waters or intracoastal waters and become a hazard for small craft. They are treated as tornadoes over water. There are two type of waterspouts: "fair weather" and "tornadic". Fair weather waterspouts are usually weaker, move slowly, and may not be associated with a thunderstorm. Tornadic waterspouts form within developing thunderstorms, or severe thunderstorms, and move much faster while being more intense.
Waterspout - A fair weather waterspout of F0 tornado intensity (73 mph or less; 63 knots or less).
Tornadic Waterspout - A waterspout associated with a developing thunderstorm, or severe thunderstorm, of F0 to F1 intensity (74 mph to 112 mph; 64 knots to 97 knots).
Significant Tornadic Waterspout - A waterspout associated with a severe thunderstorm of F2 intensity or greater (113 mph or greater; 98 knots or greater).
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