National Weather Service United States Department of Commerce

Severe Thunderstorms and Flash Flooding in the Central U.S.; A Dangerous Heatwave Coming to the West

Multiple rounds of widespread heavy rain, localized flash flooding, and severe thunderstorms are possible from the central Plains into the Great Lakes today, Friday and Saturday. A dangerous heatwave with record breaking and triple digit temperatures is expected this weekend into next week over the Northwest U.S. Excessive Heat Watches and Warnings have been issued. Read More >

NWS Greenville-Spartanburg Criteria for Non-Precipitation Watches/Warnings/Advisories
Hazard Type Watch/Warning Name
Criteria
Advisory Name
Criteria
Heat Excessive Heat Warning
Heat Index 110 or greater
Heat Advisory
Heat Index 105 or greater but less than 110
Wind (Non-Thunderstorm) High Wind Warning
Sustained winds higher than 40 mph and/or frequent gusts greater than 57 mph

Wind Advisory
Sustained Winds of 31-40 mph, and/or frequent gusts of 46-57 mph

Frost Freeze Freeze Warning
Low temperature of 32 degrees or less during the Growing Season*
Frost Advisory
Scattered to widespread frost is forecast during the Growing Season*
Fog N/A Dense Fog Advisory
Fog causing widespread visibility of 1/4 mile or less