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A wave of low pressure will trek east northeastward across the East Coast on Saturday. This system will usher early morning showers across parts of the northern Mid-Atlantic and Northeast, but high pressure behind this system and bring clear conditions for the remainder of the day. Scattered thunderstorms will also be possible to the west of the Appalachians across the Ohio Valley. To the south, an onshore flow from the Gulf of Mexico will bring a chance of stray showers and thunderstorms to the western Gulf Coast.

Meanwhile, a cold frontal boundary will stretch from the northern Rockies to the western Great Lakes on Saturday. Widespread precipitation will accompany this frontal boundary, as heavy snow is expected across the northern Rockies, while valleys across the Intermountain West will experience a mixture of rain and snow. Rain will also push across the northern Plains and the upper Midwest. An area of low pressure will develop along the front, bringing a chance of severe thunderstorms to the central Plains and the middle Mississippi Valley.

The majority of the West Coast will stay clear of wet weather on Saturday due to a ridge of high pressure over the eastern Pacific. Scattered showers will be possible over the central Sierra Nevadas and the Great Basin during the afternoon.

FRIDAY'S WEATHER EXTREMES:

HIGHEST TEMPERATURE (DEGREES F).........................103 Death Valley, Calif.

HIGHEST HEAT INDEX (DEGREES F)..........................90 Laredo, Texas

LOWEST TEMPERATURE (DEGREES F)..........................18 Crane Lake, Minn.

LOWEST WIND CHILL (DEGREES F)...........................-41 Atqasuk Edward Burnell Sr, Alaska

HIGHEST WIND GUST (MPH).................................83 Mt. Washington, N.H.

HIGHEST PRECIPITATION (INCHES)..........................1.54 Chignik, Alaska

ON THIS DATE

On this date in 1934, the weather station on Mount Washington, NH recorded a wind gust of 231 mph and a five minute wind average of 186 mph. The gust was the highest wind speed ever recorded. Interestingly, the gust may have actually been higher, but the anemometer broke.

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