Severe weather will bring associated threats in the Midwest and Northeast over the weekend.
Forecasters said thunderstorms with heavy rain will impact parts of the Dakotas, Minnesota and Wisconsin.
The National Weather Service's Weather Prediction Center issued a slight risk of excessive rainfall over parts of the northern Plains and upper Mississippi Valley through Sunday morning.
The rain there is projected to create localized areas of flash flooding.
FEMA DENIES ADDITIONAL AID FOR GEORGIA COUNTY HIT BY EF-3 TORNADO
Iowa and Missouri will see showers and severe thunderstorms, with a slight risk of severe storms issued over parts of the middle Mississippi Valley.
That area could see hazards, including frequent lightning, hail, severe thunderstorm wind gusts, hail and a few tornadoes.
Tornadoes in Mississippi killed one person and injured nearly two dozen others at the start of last week, leaving a trail of devastation.
There is also a threat of severe thunderstorm wind gusts of 65 knots or greater over parts of the region through Sunday morning.
The Weather Prediction Center also issued a marginal risk of excessive rainfall over parts of the Great Lakes, Ohio Valley, Tennessee Valley and lower Mississippi Valley from Sunday into Monday morning, also cautioning residents about localized flash flooding.
The threat of severe thunderstorms moves eastward, continuing over parts of Indiana, Ohio, Kentucky and Tennessee on Sunday.
GALE WINDS, TORRENTIAL RAIN WREAK HAVOC ON PARTS OF NORTH DAKOTA
The Storm Prediction Center issued a slight risk of severe thunderstorms over parts of the Ohio and Tennessee Valley from Sunday and through Monday morning, with dangers including frequent lightning, a few tornadoes, hail and severe thunderstorm wind gusts.
There is also a threat of severe thunderstorm wind gusts of 65 knots or greater there through Monday morning.
Canadian wildfire smoke over parts of the upper Midwest and the Ohio Valley is prompting air quality warnings.
While the Ohio Valley, Mid-Atlantic, Central Appalachians and Northeast are forecast to see showers and thunderstorms through late Saturday night, showers and thunderstorms are forecast Sunday over parts of the Northeast and Mid-Atlantic.
Heat continues for the southern U.S., including western Texas and New Mexico.
There are excessive heat warnings and heat advisories over southern nonwestern Texas, southern New Mexico, eastern Oklahoma and southwestern Louisiana.
Extreme heat in southern states has sent temperatures soaring into the triple digits.
Texas residents were asked by the state's power grid operator Tuesday to voluntarily cut back on electricity due to anticipated record demand on the system.
