Weather Underground Forecast for Thursday, July 18, 2013. A high pressure system will remain in charge of the weather pattern in the eastern half of the country Thursday, with temperature exceeding 90 degrees for many areas from the eastern seaboard through the Plains. Many areas will be under Heat Advisories once again, warning of heat indices above 100 degrees. Residents should limit sun exposure and monitor the young and elderly. Also, pets should have access to plenty of water and shade.
Some relief from the heat could be provided by pop up thunderstorms in the Southeast and Midwest that will provide periods of heavy rain, cooler temperatures, and strong winds. Additional organized rainfall is expected in the Upper Midwest from a front that will move through the Dakotas and into the Upper Midwest.
In the West, more monsoon moisture will stream into the Southwest from northern Mexico. This moisture will instigate scattered showers and thunderstorms from western Texas through Arizona and as far north as Wyoming.
The West Coast will begin to warm under a high pressure system that will bring temperatures close to, or above 100 degrees for many areas through the weekend.
The Northeast and Southeast will rise into the 90s and 100s, while the Plains and much of the Midwest will see similar temperatures. The Southwest will rise into the 100s while the Northwest will see temperatures in the 70s, 80s, and 90s.
Temperatures in the Lower 48 states Wednesday have ranged from a morning low of 32 degrees at Truckee, Calif. to a high of 105 degrees at Lakehurst NAS, N.J.