Parts of the South should prepare for scattered thunderstorms, with possible heavy rainfall and lightning. 

COAST GUARD RESCUES 7 AFTER LIGHTNING STRIKES BOAT 100 MILES OFF FLORIDA

A cold front moving in from Canada could also cause severe weather across the upper Midwest and Great Lakes through Wednesday. 

Rain Forecast

Rainfall across the country (Credit: Fox News)

Temperatures are soaring in the Southwest and California, with heat advisories posted for southern California

California temperatures

California forecast high temperatures (Credit: Fox News)

Warm and humid air across the Gulf Coast and Southeast will help enhance thunderstorms through midweek. 

South weather

Areas to watch in the southern U.S. (Credit: Fox News)

Flash flooding is possible

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In the tropics, an area of a low-pressure system in the Gulf of Mexico will be something to watch over the next few days, bringing the risk of heavy rain and flooding.