Weather

A dry air mass will allow most of the Northeast to start the week with low humidity. Showers will begin the day around Cape Cod, Massachusetts. The rest of the coastline down to the Delmarva Peninsula will also be damp, with a stiff breeze, lingering clouds and choppy seas. Thunderstorms will develop over parts of Virginia and West Virginia.

Rain and thunderstorms will soak the Mississippi and Ohio valleys and extend east to the Carolinas. This may result in flash flooding in spots. The rest of the South will be hot and humid, with thunderstorms dotting the Florida Peninsula.

In the wake of the storm bringing rain to the Mississippi Valley, brisk winds will usher cool air across the Plains. Temperatures will be 10 to 20 degrees below normal for August. The cool air mass will stop short of central and southern Texas, which will remain hot.

Another storm will bring cooler air and some rain to the northern Rockies. While thunderstorms are expected to develop across the Northwest, few of them will produce rain. With persistent lightning and gusty winds, the risk of wildfires will continue to increase across the region. The Southwest will remain hot.

Focus: Persistent Heat in the Pacific Northwest

The fire danger will spike yet again Monday through Wednesday as near-record heat prevails across the Pacific Northwest. Highs along the Interstate 5 corridor in Washington and Oregon will reach 90 to near 100, with Tuesday being the hottest.