The Storm Prediction Center has placed much of East Texas in a marginal risk area for severe weather on Wednesday, September 24. The biggest severe weather threat will come from damaging thunderstorm winds exceeding 50 mph. Storm Prediction Center/NWS Storm Prediction Center/NWS loading... The marginal risk of severe weather across Texas extends from southwest Texas through the metros of Austin, San Antonio, and Houston, and northward through the Ark-La-Tex. Timing of The StormsFor the Tyler/Longview area, the rain chances will begin to rise overnight on Wednesday to about a 50% chance at daybreak.