Flash flooding will be a risk especially in the areas that were hit by Hurricane Laura last week where the ground is still wet.
Some locations in southern Oklahoma reported up to three inches of rainfall in an hour on Tuesday, according to the National Weather Service (NWS).
A number of roads were closed in the state due to flooding, according to the Oklahoma Department of Transportation.
Video from the Johnston County Emergency Management showed flooding along the shoulder of Main Street in Tishomingo, with emergency vehicles blocking the closed road.
The heat is the other big story for Texas with above-average temperatures and heat indices well over 100 degrees Fahrenheit.
Heat advisories are up for much of the state, with some excessive heat warnings also issued.
The hot and humid conditions continue Tuesday across Texas and the Southern Mississippi River Valley, which will make ongoing cleanup efforts from Hurricane Laura even more difficult.
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The Southwest also remains hot and dry Tuesday.
A critical fire danger exists for the Northern High Plains with gusty winds, warm and dry conditions.
Showers and storms will also pop up of over parts of the Mid-Atlantic and Northeast.