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Weather across the nation: 9/23/12

3:39 PM, Sep 23, 2012   |    comments
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Wet weather gradually tapered off across much of the East Coast on Sunday, as a cold front pushed offshore into the western Atlantic Ocean.

As this disturbance departed, high pressure spread across the Midwest into the Eastern Seaboard with generally drier and cooler conditions. Cooler, northwest flow associated with this transition pushed across the warm waters of the Great Lakes and produced light, scattered, lake enhanced rain showers downwind of the lakes.

Meanwhile, to the south, rain showers and thunderstorms continued across the southern tip of Florida through the afternoon with possible flooding. Afternoon temperatures across the Midwest ranged from the upper 40s in parts of northeastern Minnesota and Michigan's Upper Peninsula to the 60s to mid-70s in the lower Ohio and Tennessee Valleys.

In the West, a trough of low pressure in the jet stream shifted eastward from the Pacific Northwest and into the Intermountain West on Sunday. This system ushered moisture in from the Pacific Ocean and cooler air from the north, triggering showers and thunderstorms across the Intermountain West into the Northern Rockies. Increasing southerly winds associated with this system combined with low humidity levels in the teens created areas of fire weather conditions in the valleys of west-central and northwestern Utah.

SUNDAY'S WEATHER EXTREMES:

HIGHEST TEMPERATURE (DEGREES F).........................105 El Centro, Calif.

HIGHEST HEAT INDEX (DEGREES F)..........................101 Marathon, Fla.

LOWEST TEMPERATURE (DEGREES F)..........................17 Langdon, N.D.

LOWEST WIND CHILL (DEGREES F)...........................12 Mt. Washington, N.H.

HIGHEST WIND GUST (MPH).................................63 Portage Glacier, Alaska

HIGHEST PRECIPITATION (INCHES)..........................0.97 Seward, Alaska

ON THIS DATE....... Strong thunderstorm downbursts can cause great damage. Today in 1983, 200 acres of timber in the Kaibab National Forest north of the Grand Canyon were destroyed by such a downburst. Some trees were cut off 15 to 30 feet above the ground.

The Associated Press

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