Heavy Rains and Severe Storms: September 2, 2010

The wet summer of 2010 continues into September. A strong area of low pressure in North Dakota, along with a warm front lifting northward over southern Minnesota spawned severe thunderstorms that began in western Minnesota shortly after midnight on September 2, and moved across the state during the overnight hours. Many people woke up to the rumble of thunder in the wee hours of the morning.

A wide swath of central and southern Minnesota received from one half to an inch and a half of rain. There were also large hail and damaging winds reported. Hail the size of golf balls was reported west of Foley in Stearns County, and wind bent a rain road crossing arm at Olivia in Renville County. The heaviest rains were reported in Lincoln, Lyon and Redwood County. The heaviest rainfall reported so far was 5.2 inches in Arco and 4.8 inches at Ivanhoe in Lincoln County. Water covered a mile of Highway 16, 6 miles south of Hendricks in Lincoln County. The National Weather Service issued a flood warning for the Redwood River near Marshall in Lyon County. The predicted crest is 14.4 feet, four tenths of a foot above flood stage.

One interesting phenomena with this complex of thunderstorms were the strong winds associated with the dying thunderstorms as they moved to the east over the Duluth area. Wind gusts over 40 mph were reported in the Duluth-Superior area, with 52mph reported at the Duluth National Weather Service, and 58mph reported on the Blatnik bridge, south of downtown Duluth. These winds were associated with a wake low, which is a localized minimum in air pressure that can sometimes develop behind an area of thunderstorms that is weakening.

Radar-based precipitation estimate


National Weather Service Storm Summaries