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Parts of the south should prepare for scattered thunderstorms, with heavy rain and possible lightning.
COAST GUARD RESCUE 7 AFTER LIGHTNING BOAT 100 MILES OFF FLORIDA
A cold front from Canada could also bring severe weather to the upper Midwest and the Great Lakes through Wednesday.
Temperatures are soaring in the Southwest and California, with heat advisories issued for Southern California.
Warm, humid air over the Gulf Coast and southeast will help strengthen thunderstorms mid-week.
A flash flood is possible.
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In the tropics, an area of depression in the Gulf of Mexico will be on the watch for the next few days, with the risk of heavy rain and flooding.