Weather Underground midday recap for Thursday, July 09, 2015

An area of low pressure shifted over northern California on Thursday, while a cold front extended from the upper Midwest to the central Plains.

A low pressure system moved eastward over northern California and the Great Basin. This system collided with monsoonal moisture, which generated showers and thunderstorms across northern California, southern Oregon, the Great Basin, the Rockies and the Four Corners. Flash flood warnings were issued across the Sierra Nevada, while a severe thunderstorm warning was issued in northwest Nevada. High pressure kept temperatures 10 to 15 degrees above normal across the Northwest. Yakima, Wash., recorded a midday high of 98 degrees. Ellensburg, Wash., recorded a midday high of 96 degrees.

Just to the east, a warm front lifted northward over the southern and central Plains. A cluster of heavy rain and strong thunderstorms fired up along this frontal boundary, which impacted the central Plains. Flash flood warnings were issued in northeast Oklahoma and southeast Missouri on Thursday. Grove, Okla., reported a midday total of 2.26 inches of rain. Poplar Bluff, Mo., reported a midday total of 1.68 inches of rain. A cold frontal boundary also extended southwestward over the eastern Great Lakes, the Ohio Valley and the middle Mississippi Valley. This frontal boundary initiated rain and severe thunderstorms over the Ohio Valley, the northern interior of the Mid-Atlantic and northwest New England. Severe thunderstorm warnings were issued in eastern Kentucky and Pennsylvania. Additionally, tornado watches were issued in northern West Virginia, Maryland and Pennsylvania. Toledo, Ohio, reported a midday total of 1.87 inches of rain.

Temperatures in the Lower 48 states Thursday have ranged from a morning low of 35 degrees at Monarch Pass, Colo. to a midday high of 100 degrees at Bennettsville, S.C.