There is the risk of strong to locally severe thunderstorms for a time Wednesday night from northern Louisiana to southern Illinois.
The greatest risks from the storms will be strong wind gusts and hail, as well as flash and urban flooding.
Cities that could be hit by the strong storms and their gusty winds and blinding downpours include Little Rock, Ark.; Memphis, Tenn.; Tupelo, Miss.; Monroe, La., Cape Girardeau, Mo.; Louisville, Ky.; and Evansville, Ind.
Even as the potential for severe thunderstorms decreases after midnight, showers and locally heavy, gusty thunderstorms will continue along an advancing front as it pushes to the east through Thursday.
There is a slight chance of a couple of the strongest storms producing a tornado.
A strong flow of air behind the front can bring damaging wind gusts even without thunderstorms.
There is the potential for nearly hurricane-force wind gusts in the clear air spanning thousands of square miles expanding from the northern Rockies to the northern and central Plains during the middle of the week.
Very blustery conditions are likely to sweep into the middle Mississippi and Ohio valleys Wednesday night and Thursday in the wake of the front.
The late-season swelter will continue along much of the Atlantic Seaboard through the week as tens of millions head back to school and work.
Tropical depression five has formed in the southwestern Gulf of Mexico's Bay of Campeche and will continue its west-northwest path during the next couple of days.
A second volcanic eruption occurred on Sunday morning in Iceland in the same area that had one on Friday.
Severe thunderstorms will threaten holiday festivities across parts of the Midwest and central Plains to close out the extended Labor Day weekend.
While flooding is a threat, monsoonal rains will be beneficial for most areas across northwest India this week.
Gusty winds, large hail and power outages occurred Sunday into Monday morning in the north-central United States.
Yuma, AZ (1950)
123 degrees - hottest temperature ever in Yuma. Yuma is the hottest city in the U.S.
Los Angeles, CA (1955)
110 degrees, hottest day ever in September. This mark was tied September 4, 1988.
Milwaukee, WI (1988)
Hottest summer on record. Six days of 100 degrees or greater and 36 days of 90 or above. Average temperature of 73.8 beat the old record of 72.8 set in 1921 and 1955. The normal average tempera- ture for a summer in Milwaukee is 68.3 degrees.