A round of severe weather, including an isolated tornado, is possible late Sunday in the Dallas area.
The severe prospects for Dallas are part of a wider threat from Texas to Illinois and Michigan.
Any storms from Sunday afternoon through evening can turn severe.
"A 'blue northern' is coming to Dallas Sunday. Ahead of the front, storms may be severe producing damaging wind gusts and hail. Temperatures will drop almost 20 degrees behind the front," AccuWeather.com Severe Weather Expert Henry Margusity said.
After Sunday, it will turn cooler and less humid with temperatures on Monday failing to get to 60 degrees F. It will return to upper 60s by Wednesday but still be cooler than normal for the area.
It will stay in the low 70s through the end of the week. There is a chance of showers Thursday night.
As the 2015 college football season gets underway, summertime warmth could lead to uncomfortable games across the Ohio Valley and South while storms roll across the Southeast and Upper Midwest.
Unsettled weather for the extended Labor Day weekend will be across the Southeast, Upper Midwest, northern Rockies and the Four Corners.
Tropical Storm Kevin developed several hundred miles southwest of Mexico and is expected to strengthen slowly as it moves northward through Thursday.
A stormy weather pattern will prevail through September across much of southern South America.
While lulls in tropical activity in the Atlantic will continue, a rapid end to the hurricane season in September does not always occur during an El Niño.
Heat will be erased by an autumnlike air mass across parts of northern Europe.
Long Island NY (1821)
Long Island hurricane of 1821 struck western Long Island. The storm affected a densely populated area where weather observers were common.
Tampa, FL (1935)
The "Labor Day" hurricane hit Tampa, killing 400 people. Earlier, this intense storm had a center barometric pressure of 26.35 inches - the lowest recorded sea level pressure in the Western Hemisphere.
Denver, CO (1961)
Earliest snow on record; a total of 4.2 inches. A great storm raged at high elevations with 2-3 feet of snow closing roads on Labor Day weekend.