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Severe Hail 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 from Severe Hail."
Within 12 miles of a location, a moderate likelihood or greater (16% probability or greater) of severe hail, with storms capable of baseball to softball sized stones. See diameter description below.
AND/OR...a high likelihood or greater (26% probability or greater) of severe hail, with storms capable of golf ball to baseball sized hail stones. See diameter description below.
AND/OR...a very high likelihood (36% or greater) of severe hail, with storms capable of quarter to golf ball sized hail stones. See diameter description below.
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High
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"A High Threat to Life and Property from Severe Hail."
Within 12 miles of a location, a low likelihood (6% to 15% probability) of severe hail, with storms capable of baseball to softball sized stones. See diameter description below.
AND/OR...a moderate likelihood (16% to 25% probability) of very large hail (golf ball to baseball sized hail stones). See diameter description below.
AND/OR...a high likelihood (26% to 35% probability) of large hail (quarter to golf ball sized hail stones). See diameter description below.
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Moderate
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"A Moderate Threat to Life and Property from Severe Hail."
Within 12 miles of a location, a very low likelihood (2% to 5% probability) of severe hail, with storms capable of baseball to softball sized stones. See description below.
AND/OR...a low likelihood (6% to 15% probability) of severe hail, with storms capable of golf ball to baseball sized hail stones. See description below.
AND/OR...a moderate likelihood (16% to 25% probability) of severe hail, with storms capable of quarter to golf ball sized hail stones. See diameter description below.
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Low
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"A Low Threat to Life and Property from Severe Hail."
Within 12 miles of a location, a very low likelihood (2% to 5% probability) of severe hail, with storms capable of golf ball to baseball sized hail stones. See diameter description below.
AND/OR...a low likelihood (6% to 15% probability) of severe hail, with storms capable of quarter to golf ball sized hail stones. See diameter description below.
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Very Low
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" A Very Low Threat to Life and Property from Severe Hail."
Within 12 miles of a location, a very low likelihood (2% to 5% probability) of severe hail, with storms capable of nickel to golf ball sized hail stones. See diameter description below.
AND/OR...a low likelihood or greater (6% or greater) of small hail (less than 1 inch). See diameter description below.
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Non-Threatening
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" No Discernable Threat to Life and Property from Severe Hail."
Within 12 miles of a location, environmental conditions do not support the occurrence of severe hail.
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| Note: To be considered severe, hail stones must be at least 1 inch in diameter.
Small Hail - Hail less than 1 inch in diameter (from the size of peas to nickels).
Large Hail - Hail from 1 inch to 1 3/4 inch in diameter (from the size of quarters to golf balls) causing minor damage.
Very Large Hail - Hail from 1 3/4 inch to 2 3/4 inch in diameter (from the size of golf balls to baseballs) causing moderate damage.
Giant Hail - Hail larger than 2 3/4 inch (larger than baseballs, such as the size of grapefruit or softballs) causing major damage.
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