The nation’s weather

Weather Underground midday recap for Wednesday, July 17, 2013. The big weather story continued to be the extreme heat in the East due to a strong high pressure system that was anchored over the Ohio Valley but expanded from the Plains through the eastern seaboard. Much of the eastern half of the country from the Mississippi Valley through the East Coast rose well above 90 degrees, and Heat Advisories were posted from southern Minnesota through the New England coast. These advisories warned of heat index values of 100 degrees or more, putting strain on the electrical grid and residents who have already suffered through multiple days of sweltering heat. Residents were warned to drink plenty of fluids and stay out of the sun.

Monsoon moisture continued to stream into the Southwest, sparking scattered rain and thunderstorms from western Texas through Arizona. A few showers and thunderstorms develop as far north asa western Montana and Idaho.

A warming trend was set for the West Coast as a high pressure system began to strengthen along the coast. This warming trend was set to last into the weekend, bringing temperatures over 100 degrees for many areas.

The Northeast rose into the 90s and 100s, while the Southeast and Midwest saw similar temperatures. The Northwest rose into the 70s and 80s, while the Southwest saw temperatures in the 90s and 100s.

Temperatures in the Lower 48 states Wednesday have ranged from a morning low of 32 degrees at Truckee, Calif. to a midday high of 105 degrees at Lakehurst NAS, N.J.

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