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Severe thunderstorms will continue spreading across the Eastern states on Friday as a low pressure system over the Great Lakes continues pulling a cold front eastward. Warm and moist air from the Gulf of Mexico will pour in ahead of this front, producing more showers and thunderstorms. These conditions will allow for severe thunderstorms to develop with large hail and strong winds, with possibly a few tornadoes. If severe thunderstorms develop, they will most likely be contained to the Mid-Atlantic states from South Carolina through Washington D.C. Meanwhile, the northern side of this system will allow for snow showers to taper off for the Upper Midwest and Great Lakes as the system pulls northeastward and further into eastern Canada. High pressure building in behind the low pressure system and associated cold front will push cooler air in from the North, allowing for chilly conditions to spread across the Eastern Valleys on Friday. Expect highs to range in the 50s to lower 60s for the Mississippi River Valley and Tennessee Valley.

In the West, another system moves into the Pacific Northwest from the Gulf of Alaska. This will pull Pacific moisture onshore, kicking up rain and mountain snow showers across Oregon and Washington. Precipitation from this system will spread into the Intermountain West and Northern Rockies as it advances eastward throughout the day.

THURSDAY'S WEATHER EXTREMES:

HIGHEST TEMPERATURE (DEGREES F).........................99 Brownsville, Texas

HIGHEST HEAT INDEX (DEGREES F)..........................106 Brownsville, Texas

LOWEST TEMPERATURE (DEGREES F)..........................-10 Yellowstone Lake, Wyo.

LOWEST WIND CHILL (DEGREES F)...........................-36 Deadhorse, Alaska

HIGHEST WIND GUST (MPH).................................90 Mt. Washington, N.H.

HIGHEST PRECIPITATION (INCHES)..........................11.29 Madison, S.D.

ON THIS DATE

Much of the western United States sweltered in a heat wave on this date in 1989 as twelve cities reported record high temperatures. The earliest triple digit recording was reporting at Tucson AZ while Hanksville UT tied their high record of 98 degrees.

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