FirstEnergy (FE) Tropical storm Edouard remains active, causing strong winds and heavy rainfall in parts of eastern Texas and bringing a risk of flash floods, the National Weather Service said on Thursday.
An NWS map showed that the flash flood threat had diminished in scope with Houston one of the few places remaining at risk.
CenterPoint Energy and Entergy Texas are among the main power providers in the area.
Severe thunderstorms and heavy rain are possible over some of the eastern Great Lakes stretching to the Mid-Atlantic while severe storms expected across some of Montana, the update said.
In the center and east of the country, the NWS said that dangerously high temperatures would continue until at least Friday night.
The Center-Eastern warning for excessive heat was in force in Cape Girardeau, Farmington, Chestar, St. Louis, Vandalia, Carlinville, Springfield, Quincy, Columbia, Jefferson City, Mexico, Washington, Centerville, Poplar Bluff, Mayfield, Paducah, Hopkinsville, Madisonville, Carbondale, Mount Vernon, Carmi, Evansville, Owensboro, Petersburg, Iowa City, Davenport, Princeton, Burlington, Galesburg, Peoria, Macomb, Keokuk, Lincoln, Pekin, Bloomington, Havana, Jacksonville, Decatur, Taylorville, Effingham, Carlinville, Ofney, Salem and Olney.
Power providers across this large zone include Ohio Edison, AEP Ohio, AES Indiana (AES), Duke Energy (DUK), LG&E and KU, CenterPoint Energy (CNP), Kentucky Power, Potomac Edison, Appalachian Power Company, Georgia Power, Alabama Power, Entergy Arkansas (ETR) and Entergy Mississippi.