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SPC Day 1 Categorical Outlook
SPC Day 1 Categorical Outlook

Severe Thunderstorm Risk Categories

Category Definition Possible Impacts
THUNDERSTORMS (no label)(light green) No severe* thunderstorms expected. Lightning/flooding threats exist with all thunderstorms. Winds to 40 mph. Small hail.
1 - MARGINAL (MRGL)(dark green) Isolated severe thunderstorms possible. Limited in duration and/or coverage and/or intensity. Winds 40-60 mph. Hail up to 1". Low tornado risk.
2 - SLIGHT (SLGT)(yellow) Scattered severe storms possible. Short-lived and/or not widespread, isolated intense storms possible. One or two tornadoes. Reports of strong winds/wind damage. Hail ~1", isolated 2".
3 - ENHANCED (ENH)(orange) Numerous severe storms possible. More persistent and/or widespread, a few intense. Several reports of wind damage. A few tornadoes. Damaging hail, 1- 2".
4 - MODERATE (MDT)(red) Widespread severe storms likely. Long-lived, widespread and intense. Strong tornadoes. Widespread wind damage. Destructive hail, 2" +.
5 - HIGH (HIGH)(magenta) Widespread severe storms expected. Long-lived, very widespread and particularly intense. Tornado outbreak. Derecho.
* NWS defines a severe thunderstorm as measured wind gusts to at least 58 mph, and/or hail to at least one inch in diameter, and/or a tornado. All thunderstorm categories imply lightning and the potential for flooding. Categories are also tied to the probability of a severe weather event within 25 miles of your location.
This table is adapted from information available on National Weather Service (NWS) Storm Prediction Center's (SPC) website.

SPC Day 1 Outlook For Kentucky
SPC Day 1 Outlook For Kentucky

NOAA Day 1 National Forecast Map
NOAA Day 1 National Forcast Map

Day 1 Precipitation Forecast
Day 1 Precipitation Forecast


SPC Day 2 Categorical Outlook
SPC Day 2 Categorical Outlook

SPC Day 2 Outlook For Kentucky
SPC Day 2 Outlook For Kentucky

NOAA Day 2 National Forecast Map
NOAA Day 2 National Forcast Map

Day 2 Precipitation Forecast
Day 2 Precipitation Forecast


SPC Day 3 Categorical Outlook
SPC Day 3 Categorical Outlook

SPC Day 3 Outlook For Kentucky
SPC Day 3 Outlook For Kentucky

NOAA Day 3 National Forecast Map
NOAA Day 3 National Forcast Map

Day 3 Precipitation Forecast
Day 3 Precipitation Forecast


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