Weather across the nation on September 21, 2016

A cold frontal boundary shifted east southeastward over the upper Mississippi Valley, the northern Plains and the upper Intermountain West.

This frontal boundary collided with warm and humid air, which led to the development of strong to severe thunderstorms. The strongest storms focused over the northern Plains and the upper Mississippi Valley on Wednesday.

Flash flood warnings and severe thunderstorm warnings were issued in western Wisconsin. Flood warnings were also issued in parts of southern Minnesota and Iowa. Trempealeau, Wisconsin, reported 1.25 inch sized hail. Sparta, Wiconsin, reported a midday total of 2.78 inches of rain.

Meanwhile, a wave of low pressure brought showers and thunderstorms to the Mid-Atlantic. Flood warnings and flood advisories were issued in parts of eastern Virginia and eastern North Carolina. Chesapeake, Virginia, reported a midday total of 4.74 inches of rain. Edenton, North Carolina, reported a midday total of 3.49 inches of rain.

In the West, subtropical moisture associated with the remnants of Hurricane Paine surged across the Southwest. Scattered showers and thunderstorms developed in southern California, southern Nevada and the Four Corners.

In addition, a trough of low pressure generated scattered showers over the Northwest and the upper Intermountain West. Cool air also accompanied this system. Meacham, Oregon, recorded a morning low of 30 degrees. Stanley, Idaho, recorded a morning low of 35 degrees.

WEDNESDAY'S WEATHER EXTREMES:

HIGHEST TEMPERATURE (DEGREES F).........................98 McAllen, Texas

HIGHEST HEAT INDEX (DEGREES F)..........................111 Tampa Macdill AFB, Fla.

LOWEST TEMPERATURE (DEGREES F)..........................30 Meacham, Ore.

LOWEST WIND CHILL (DEGREES F)...........................19 Monarch Pass, Colo.

HIGHEST WIND GUST (MPH).................................78 Portage Glacier, Alaska

HIGHEST PRECIPITATION (INCHES)..........................4.99 Norfolk Hampton Roads Exec, Va.
 

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Copyright 2016 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.


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