Tropical Storm Elsa could become a hurricane before making landfall over Florida, while in the Northeast, severe weather threatens at least six states. Texas and the upper Midwest face flooding, while heatwaves slam both coasts.
Thunderstorms will span three-quarters of the nation on Tuesday, extending from both the Southwest and the northern Rockies and the West, across the South and to the northern tip of Maine, according to the latest forecast by the National Weather Service (NWS).
At least four storm fronts could bring flooding, as well as severe weather on at least two fronts.
The first is over Florida as tropical storm Elsa is poised to make landfall and could become a hurricane before doing so. The severe weather and flooding threat covers most of the state with the exception of the Panhandle.
The second severe weather front is over parts of the Northeast to include New Jersey, Pennsylvania, New York, Connecticut, Rhode Island, Massachusetts, as well as southern Vermont and New Hampshire.
The third storm front is over the upper Midwest where heavy rain could bring flooding to eastern South Dakota; northern Iowa, southern Minnesota, and much of Wisconsin.
The fourth storm front is a flooding threat over southern Texas into parts of Mexico, as well as along the east coast of Texas south of Houston.
The National Weather Service (NWS) has issued the following alerts for Tuesday:
Flash flood watch: southern Texas and southeastern areas along the Gulf coast; southern Georgia; southeastern Colorado.
Flood advisory: Northern and central New Mexico.
Tropical storm warning: Florida along the western coastal areas, as well as the northeastern portion of the state.
Sizzling temperatures for the West will continue on Tuesday, while the mercury will also spike for the Northeast.
In the Northeast, a heatwave will bring temperatures near triple digits, compounded by thunderstorms and a severe weather threat.
The end of the heatwave in the West has no end in sight, stretching from western Colorado, and New Mexico to the Pacific and to parts of the northern Rockies on Tuesday.
In general, most of the region can expect temperatures above 90 degrees. However, temperatures above 100 degrees are forecast portions of Washington, Oregon, Idaho, California, Nevada, and Arizona.
The National Weather Service (NWS) has issued the following heat alerts:
Excessive heat warning: eastern Oregon, southwestern Idaho.
Excessive heat watch: northeastern, southeastern and desert regions of California; western and southern Nevada; northwestern Arizona.
Heat advisory: southwestern Oregon; eastern Idaho; northwestern California, northern Nevada, western and central Utah; Washington, D.C.; central, eastern and western Maryland; northern Virginia, eastern West Virginia; southern and central Pennsylvania, New Jersey; Delaware; eastern New York; western New England area; Connecticut; Rhode Island; central and eastern Massachusetts.