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Showers and thunderstorms developed across the Plains again on Monday, while rain showers spread across the West Coast.

A trough of low pressure moved off the Rockies and into the Central Plains, creating two strong frontal boundaries over the center of the nation. Flow around these systems pulled warm and moist air northward from the Gulf of Mexico, which allowed for heavy rainfall and strong thunderstorms to develop along a warm front that stretched eastward from Nebraska and into the Ohio River Valley.

At the same time, a cold front extended southward across the Central and Southern Plains, which also produced some strong thunderstorms that moved toward the Mississippi River Valley throughout the day. Some storms have turned severe over the Midwest and Central Plains with damaging winds, large hail, and periods of heavy rainfall. This allowed for flooding to remain a concern for the Upper and mid-Mississippi River Valley and surrounding tributaries.

Meanwhile, out West, a late season Pacific storm pushed another cold front onshore which brought ample moisture onshore with it. this system extended over Oregon and northern California, and moved southeastward throughout the day. Lighter and more scattered showers developed to the north across Washington, northern Idaho, and into Montana.

Strong winds and cooler temperatures accompanied this system as it moved across the Northwestern corner of the nation. South of this activity, high pressure over the Four Corners maintained warm, dry, and breezy conditions. Thus, fire danger remained high for the region with Red Flag warnings in effect for Arizona, Utah, Colorado, and New Mexico.

MONDAY'S WEATHER EXTREMES:

HIGHEST TEMPERATURE (DEGREES F).........................102 Lakehurst NAS, N.J.

HIGHEST HEAT INDEX (DEGREES F)..........................115 Hurlburt Field, Fla.

LOWEST TEMPERATURE (DEGREES F)..........................32 West Yellowstone, Mont.

LOWEST WIND CHILL (DEGREES F)...........................23 Point Hope, Alaska

HIGHEST WIND GUST (MPH).................................139 Joliet, Ill.

HIGHEST PRECIPITATION (INCHES)..........................20.33 Blue Canyon, Calif.

ON THIS DATE....... On this date in 1975, Eastern Airlines Boeing 727 crashed 2,400 feet short of the runway at JFK Airport in New York City. The incident claimed the lives of 113 of the 124 people on board. Theodore Fujita studied the crash and discovered that it was caused by a microburst that was not experienced at the tower because it was held back by a seabreeze front.

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