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A low pressure system moved slowly eastward over the southern Plains on Wednesday. As this system interacted with a warm, humid air mass over the nation's midsection, heavy rain and thunderstorms developed over several states.

Flash flood watches were issued in Oklahoma and western Arkansas as a cluster of thunderstorms moved over the region. Garden City, Kansas, reported a midday total of 2.32 inches of rain, while Woodward, Oklahoma, reported a midday total of 1.79 inches of rain. In addition, flash flood watches were issued in eastern Colorado and northeast New Mexico due to heavy rain over the front range of the Rockies.

Lamar, Colorado, reported a midday total of 1.09 inches of rain, while Belen, New Mexico, reported a midday total of 0.84 inches of rain. High pressure kept conditions clear across the northern Plains and the upper Mississippi Valley.

Meanwhile, a cold front extended across the Great Lakes on Wednesday, which brought below normal temperatures to the upper Midwest and parts of the Northeast. Saranac Lake, New York, recorded a morning low of 37 degrees. A low pressure system along the eastern end of the cold front ushered showers and thunderstorms across the Ohio Valley, western Pennsylvania and western New York.

In the West, monsoonal moisture over the Great Basin initiated isolated thunderstorms across parts of Idaho, Nevada and California. Flash flood watches were issued in northwest Nevada and along the central Sierra Nevadas. The remainder of the West Coast stayed mostly clear of precipitation.

WEDNESDAY'S WEATHER EXTREMES:

HIGHEST TEMPERATURE (DEGREES F).........................111 Thermal, Calif.

HIGHEST HEAT INDEX (DEGREES F)..........................104 Ft Lauderdale, Fla.

LOWEST TEMPERATURE (DEGREES F)..........................37 Saranac Lake, N.Y.

LOWEST WIND CHILL (DEGREES F)...........................22 Barrow, Alaska

HIGHEST WIND GUST (MPH).................................82 Mountain Village Airport, Alaska

HIGHEST PRECIPITATION (INCHES)..........................2.32 Garden City, Kan.

ON THIS DATE....... The Crow Indians in Yellowstone Valley were the subjects of nature's wrath on this date in 1877. Large hailstones (some as big as a man's fist) punctured the tribe's teepees and killed many of their ponies.

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