Strong to severe thunderstorms, as well as excessive rainfall, are possible Thursday for the Texas coast into Louisiana. Going into Friday, strong to severe thunderstorms will be possible for the Gulf Coast. Excessive rainfall will be possible from the Tennessee Valley into the Mid Atlantic.

US Hazards

Region 1

A complex of strong to severe thunderstorms over western portions of South Texas will continue to progress eastward during the morning and afternoon hours. Some of the storms will have the potential for damaging winds and moderate to large hail. Isolated tornadoes cannot be ruled out with the highest threat along the coastal areas this afternoon. In addition, there will be a chance for excessive rainfall leading to flash flooding across Region 1. Rainfall amounts of 1-3 inches, with locally higher amounts in excess of 4 inches, are possible.

Region 1

Strong to Severe Thunderstorms Possible Across Central Gulf Coast on Friday

Strong to severe thunderstorms will be possible across the central Gulf Coast and into the Southeast on Friday. Showers and thunderstorms will be ongoing during the morning hours with redevelopment in the afternoon. Severe thunderstorms will be isolated with damaging winds being the primary hazard.

SPC Convective Outlook

Excessive Rainfall Possible Friday for Tennessee Valley into Mid-Atlantic

There will be a chance for excessive rainfall and flooding on Friday for the Tennessee Valley and into the Mid Atlantic. Widespread showers and thunderstorms will impact the region during the day on Friday. Rainfall totals of 1-2 inches with locally higher amounts in excess of 3 inches will be possible.

Total Precipitation through 2am EDT Saturday, May 21, 2016