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There were two weather systems that affected the nation today. The first one was the cold front that extended from Ontario southwestward through the Upper Midwest and curved northwestward into the Northern Plains.

This system supported scattered showers and thunderstorms across the Upper Great Lakes, Upper Midwest and Northern Plains. Severe thunderstorms fired up in the afternoon in southwestern South Dakota and produced quarter size hail and damaging winds in excess of 60 mph.

The second one was the stationary frontal boundary from the Mid-Atlantic to the Southern Plains. This system combined with abundant Gulf moisture led to widespread showers and isolated thunderstorms across the Mid-Atlantic, Southeast and parts of the Southern Plains.

Some severe storms developed in the Southern Plains and produced hail nearly two inches in diameter and high wind gusts. Elsewhere, monsoonal moisture remained active, which continued to support showers and storms over the Southern and Central Rockies.

Temperature wise, another hot day prevailed across the Desert Southwest, Central Plains and Texas. Afternoon temperatures rose well into the 100s and portions of the Desert Southwest reached nearly 110F.

TUESDAY'S WEATHER EXTREMES:

HIGHEST TEMPERATURE (DEGREES F).........................109 Needles, Calif.

HIGHEST HEAT INDEX (DEGREES F)..........................110 Thermal, Calif.

LOWEST TEMPERATURE (DEGREES F)..........................33 West Yellowstone, Mont.

LOWEST WIND CHILL (DEGREES F)...........................26 Barrow, Alaska.

HIGHEST WIND GUST (MPH).................................48 Astoria, Ore.

HIGHEST PRECIPITATION (INCHES)..........................3.21 Dothan, Ala.

ON THIS DATE: -How would you like to be in a city that receives over 60 consecutive days of 100 degree heat? Well, the citizens of Phoenix, Ariz., suffered through the 62nd day of plus 100 degree heat on this date in 1989. Ironically, on the same day, 40 other national cities reported record lows.

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