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[September 16, 2010] (AP) A potent low pressure system from the Great Plains was forecast to move across the Great Lakes and the Ohio Valley with active weather Thursday.

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The system was expected to spread rain across the Great Lakes with strong winds gusting to near 25 mph. An associated warm front would reach into the southern Northeast as the system progressed eastward. Stronger storms developing from the Ohio Valley into upstate New York may produce bands of heavy rainfall and damaging winds.

Forecasters said additional showers and isolated thunderstorms may develop along an associated cold front that would extend through the Tennessee Valley into the southern Plains. Daytime heating and a wave of low pressure along the tail of this front would increase instability across the Texas and Oklahoma panhandles, creating chances of severe weather activity with damaging winds, hail and perhaps an isolated tornado or two through the afternoon.

In the West, a low pressure system located off the western Canada and the Pacific Northwest coasts would swing several disturbances and precipitation through the Pacific Northwest during the next couple of days. The low would also cause a weak wave of high pressure to move over central California with seasonable weather. As the offshore low deepened, cooler weather was forecast for California through the weekend.

Temperatures in the Lower 48 states Wednesday ranged from a low of 25 degrees at Big Piney, Wyo., to a high of 109 degrees at Indio, Calif.

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[Associated Press article from Weather Underground]