Severe Thunderstorm Watch Issued in Louisiana and Texas, With Possible Flash Flooding in Parts of the South

Severe weather is expected in the Central and Eastern Gulf Coast regions through Thursday. Heavy rainfall and flash flooding is possible in parts of the Central and Southern Appalachians, the National Weather Service warns.

"The…storm system will be moving into the eastern U.S. by Friday as low pressure advances into the Great Lakes region. This will drive a cold front eastward from the Midwest to the Ohio and Tennessee Valleys, and across the Gulf Coast," the NWS Weather Prediction Center (NWS WPS) notes.

A severe thunderstorm watch is in place across parts of Louisiana and Texas until 9 a.m. (Central Time). A severe thunderstorm is defined as a thunderstorm that produces one inch hail or larger in diameter and/or winds equal to or above 58 miles per hour, NWS explains.

The five Louisiana parishes of Iberia, St. Martin, St. Mary, Cameron and Vermilion are included in the severe thunderstorm watch warning.

Here's a look at the current radar (630pm ET) with a healthy line of thunderstorms ahead of the strong cold front. Overlaying with the radar is the severe thunderstorm outlook for this evening and overnight from our colleagues @NWSSPC, which includes a moderate threat in red.

— National Weather Service (@NWS) April 28, 2020

A severe thunderstorm watch is also in effect in Texan cities including Abbeville, Bayou Vista, Beaumont, Berwick, Breaux Bridge, Burns Point, Cade, Centerville, Forked Island, Franklin, Intracoastal City, Johnson Bayou, Kaplan, Meaux, Morgan City, New Iberia, Patterson, Sabine Pass, Sea Rim State Park, St. Martinville, and Stephensville, NWS reports.

Severe thunderstorms are also possible around the Tallahassee, Florida region on Wednesday evening.

"A cold front will bring the potential for isolated to scattered severe storms to the region, mainly from this afternoon into tonight [Wednesday]. The main threats are expected to be isolated to scattered instances of damaging wind and mainly small hail, but a couple of tornadoes across the region cannot be completely ruled out. The area of greatest risk currently appears to be across southeast Alabama and adjacent sections of southwest Georgia and the Florida panhandle," the NWS states.

The latest three day precipitation forecast shows a busy stretch of weather across the eastern half of the Lower 48. This includes the threat of severe weather & flash flooding. In this loop are the latest Excessive Rainfall Outlooks for tonight, Wednesday, & Thursday.

— NWS Weather Prediction Center (@NWSWPC) April 28, 2020

Elsewhere, above normal temperatures will continue across parts of the Southwest and Great Basin regions through midweek, with temperatures rising as high as 10 to 20 degrees above normal, which will see some interior deserts of the Southwest region pass 100 degrees (Fahrenheit), the NWS notes.

"By Thursday, some of this very warm air will begin to shift eastward and should begin to advance out across the High Plains as the ridge shifts eastward in response to an upper trough approaching the West Coast," the NWS predicts.

French Quarter, New Orleans, Louisiana, April 2020
A general view of empty streets in the French Quarter on April 9, 2020 in New Orleans, Louisiana. Getty Images