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    More Dangerous Thunderstorms Tonight in Upper Midwest

    August 8, 2010; 4:04 PM ET
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    In this Aug. 7, 2010 image made from APTN video, a tornado destroys a structure in rural Wilkin County, Minn. The National Weather Service says several tornadoes touched down in southeast North Dakota and western Minnesota. No injuries appear to have been reported. Meteorolgist Tom Grafenauer says a line of storms that started in North Dakota and moved east into Minnesota appears to have generated several tornadoes. He says touchdowns were reported near Tyler, N.D.; Tenney, Minn.; and Fergus Falls, Minn. (A

    Severe thunderstorms will again threaten the northern Plains tonight into Monday as a front stays stalled over the region. Through tonight, areas from Nebraska and southeastern South Dakota into southern Minnesota and Iowa will be at the greatest risk.

    Meanwhile, areas of west-central Minnesota, far southeastern North Dakota and northern Wisconsin that were just hit by tornadoes Saturday will catch a break from severe weather tonight. These places could, however, be at risk again by Monday night.

    Nasty thunderstorms capable of producing large hail, damaging winds and tornadoes were already starting to fire up over north-central Nebraska and southeastern South Dakota by mid-afternoon Sunday.

    More thunderstorms like these will erupt farther east through early tonight, threatening cities such as Sioux Falls, S.D., Mankato, Minn., and Des Moines, Iowa.

    People potentially in the path of these thunderstorms should be ready to seek shelter immediately if a severe thunderstorm or tornado warning is issued.

    Overnight, the thunderstorms are expected to evolve into a large cluster, most likely over Iowa, with heavy rain becoming the main risk factor. Minor street flooding could slow traffic for the Monday morning commute in a few areas.

    While the cluster of thunderstorms will weaken throughout Monday morning as it heads farther east, a new round of severe thunderstorms will break out farther west Monday afternoon.

    Areas from eastern Montana to western Iowa and northeastern Colorado could all be affected. Again, damaging winds and hail will be the main threats. These thunderstorms will spread farther east through southern Minnesota, Iowa and eventually into southern Wisconsin and northern Illinois Monday night.

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