Posted June 12, 2018 9:01 p.m. EDT
Humidity is expected to briefly build Wednesday over the central Appalachians, the Middle Atlantic and New England. A south wind will usher in the humid air, ahead of a cold front moving over the Midwest.
As the warm and cool air collide, showers and thunderstorms will develop from interior New England to the southern Plains. Severe thunderstorms are most likely to occur from the eastern Great Lakes to the northern Appalachians, especially in upstate New York. Some of the storms may produce strong gusts, hail and flash flooding in the afternoon and evening.
Farther south, very spotty afternoon storms are in the forecast. A mass of cool, less humid air will expand from the northern Plains to the western Great Lakes.
Most of the West should be dry, with plenty of sunshine from the interior Southwest to the Great Basin and much of the central Rockies. A light breeze from the ocean will provide low clouds across the California beaches in the morning. A storm will move across Washington, Oregon, Idaho and western Montana, bringing clouds, showers and cooler air.
FOCUS: Father’s Day Outlook
Rain and heavy thunderstorms are expected from the northern Rockies to the northern Plains on Sunday. The western Gulf Coast will remain unsettled, with heavy rain. Hot air will prevail across the Midwest and interior Northeast.