Flash flooding is possible in southeastern Texas on Wednesday as Tropical Storm Edouard brings strong winds, storm surge and heavy rainfall, the National Weather Service said, but areas at risk of damage had shrunk versus Tuesday.
On the other hand, warnings for hazardous heat covered a broader area of the central and eastern US, with an accompanying risk of severe thunderstorms stretching from the Great Lakes to the Mid-Atlantic.
More than 20 states were either fully or partly covered by heat warnings.
These included Texas, Oklahoma, Arkansas, Mississippi, Alabama, Tennessee, Georgia, North and South Carolina, West Virginia, Washington D.C., Pennsylvania, Ohio, Kentucky, Michigan, Illinois, Indiana, Iowa, Missouri, Kansas and Nebraska.
A cluster of territory stretching across Illinois, Indiana, Missouri and Kentucky had a more severe 'extreme' heat warning in place, National Weather Service data showed.
In terms of flood risks on the Gulf Coast where news reports say Storm Edouard has already made landfall, warnings are in place for Houston, Beaumont, Lake Charles as well as Lufkin and Bryan, further inland.
The main power providers in these areas are Entergy's (ETR), Center Point Energy (CNP), Duke Energy (DUK) and Ameren (AEE).
The agency also issued high wind warnings in Dillon and Butte in Montana and Stanley, Sun Valley and Hailey in Idaho. Northwestern Energy (NWE) and Idacorp's (IDA) Idaho Power serve these territories.