Posted June 17, 2018 6:13 p.m. EDT
Record-challenging heat will affect parts of the Ohio Valley, the mid-Atlantic states and the Northeast on Monday as a strong high-pressure system remains centered off the East Coast. A cold front pressing into New England, the Great Lakes and the Upper Midwest will limit the heat and produce showers and thunderstorms. Some of the storms may be strong enough to bring damaging winds, hail and flash flooding.
A few spotty afternoon showers and thunderstorms will develop across the higher terrain of western and northern Pennsylvania as well as northern New Jersey. Spotty afternoon thunderstorms will also affect parts of the Southeast and the Tennessee Valley. Hot and humid conditions will prevail across the Northeast and the mid-Atlantic.
Tropical moisture will fuel widespread rain and thunderstorms across South and East Texas as well as western Louisiana, where there may be widespread flash flooding. Scattered showers and thunderstorms, some of which could cause flash flooding, will extend across the northern Rockies.
Unseasonable warmth will prevail west of the Cascades in Washington and Oregon. California and the Southwest will be more seasonable and dry.
FOCUS: Possible Flooding Rain in Texas
Flooding tropical rain may exceed 1 foot this week across the Texas coastal plain as a tropical, low-pressure system drifts into South Texas. The heaviest rain is expected from Houston and San Antonio to Brownsville.