Posted: $util.date("h:mm a MMM d, yyyy",$story.contentLiveDate,$timeZone)
Reporter: AP

The main weather producer for the nation Wednesday and Thursday will be the cold front over the Upper Midwest and Central Plains as it continues to strengthen and move northeast across the Central and Eastern U.S. Widely scattered showers and thunderstorms are expected along its path. There is a slight risk for severe thunderstorms for Upper Michigan and northern and central Wisconsin, with the primary threat of severe wind and hail. Apart from the precipitation, much cooler air will filter in after the cold front. This will end the recent hot weather over the Central Plains and Upper Midwest Wednesday and Thursday.
In the East, a warm front will bring showers and thunderstorms to northern New England as early as Wednesday afternoon and continue through the night. Moreover, a heat wave will spread eastward into the Eastern U.S. Wednesday and Thursday.
Moving to the South, an area of heavy rain is expected for southern Florida Wednesday as a trough of low pressure with a moist tropical wave remains nearly stationary over the Florida Strait. In addition, moist southerly flow from the Gulf of Mexico will continue to support showers and thunderstorms over southern and eastern Texas.
Farther west, scattered showers and thunderstorms will continue over the Northern High Plains.
TUESDAY'S WEATHER EXTREMES:
HIGHEST TEMPERATURE (DEGREES F).............114 Needles, Calif.
HIGHEST HEAT INDEX (DEGREES F)...................114 Laredo, Texas
LOWEST TEMPERATURE (DEGREES F).................24 Stanley, Idaho
LOWEST WIND CHILL (DEGREES F)...........................25 Butte, Mont.
HIGHEST WIND GUST (MPH).................................64 St. Paul, Minn.
HIGHEST PRECIPITATION (INCHES)...................3.36 Grand Rapids, Minn.
ON THIS DATE
Parts of Nebraska experience a hot morning on this date in 1997. Some cities reported overnight low temperatures in the upper 70s before warming significantly by midmorning. By 5 a.m., Lincoln reported 89 degrees and Omaha suburbs reported 90 degrees. The heating was caused by hot air aloft being brought down to the surface by thunderstorms.

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