Weather across the nation on September 18, 2016

A cold frontal boundary extended southwestward from the Great Lakes to the southern Plains.

As this frontal boundary transitioned eastward, it interacted with a warm and muggy air mass. The collision of these two air masses generated multiple areas of thunderstorms across the interior Mid-Atlantic, the Midwest, the Deep South, Mississippi Valley and the southern Plains.

Flood warnings were issued in the middle Mississippi Valley on Sunday. Hot Springs, Arkansas, reported a midday total of 1.98 inches of rain. Mount Sterling, Kentucky, reported a midday total of 1.27 inches of rain. Tropical Depression Julia also ushered scattered storms across the southern Mid-Atlantic as it approached the Carolinas.

Meanwhile, another frontal system generated scattered showers and stray thunderstorms in parts of the northern Plains and the upper Mississippi Valley.

A Pacific cold front moved onshore over the Northwest. This system brought light showers and cool air to Washington and western Oregon. Seattle recorded a midday high of 61 degrees.

High pressure kept conditions warm and dry in the Southwest. Temperatures rose into the 90s and triple digits across the Desert Southwest on Sunday. Palm Springs, California, recorded a midday high of 100 degrees. Scottsdale, Arizona, recorded a midday high of 96 degrees.

SUNDAY'S WEATHER EXTREMES:

HIGHEST TEMPERATURE (DEGREES F).........................102 Thermal, Calif.

HIGHEST HEAT INDEX (DEGREES F)..........................111 Port Aransas, Texas

LOWEST TEMPERATURE (DEGREES F)..........................26 Gunnison, Colo.

LOWEST WIND CHILL (DEGREES F)...........................10 Anaktuvuk Pass, Alaska

HIGHEST WIND GUST (MPH).................................59 Mt. Washington, N.H.

HIGHEST PRECIPITATION (INCHES)..........................1.98 Hot Springs, Ark

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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 This material may not be published, broadcast, rewritten or redistributed.


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