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Flooding chances increase in southern Minnesota, up to 4 inches of rain per hour in heaviest storms

Carver County has already been hammered and more rain is coming.
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Heavy thunderstorms are dropping significant amounts of rain in parts of Minnesota on Saturday, with southeastern Carver County already receiving in excess of four inches. 

A flash flood warning has been issued for the southeast portion of Carver County, where the National Weather Service says an additional 2-3 inches of rain could still fall. 

Related: Tornadoes possible in southern Minnesota Saturday afternoon

Meanwhile, a flash flood watch has been issued for the following counties in south-central and southeast Minnesota: Brown,  Nicollet, Le Sueur, Rice, Watonwan, Blue Earth, Waseca, Steele, Martin, Faribault and Freeborn. That includes the cities of New Ulm, St. Peter, Le Sueur, Faribault, St. James, Mankato, Waseca, Owatonna, Fairmont, Blue Earth and Albert Lea, among others. 

The NWS is forecasting slow-moving thunderstorms to develop throughout the day with 2-4 inches of rain per hour in the strongest storms. 

WCCO meteorologist Mike Augustyniak took a step further, saying 3-8 inches of additional rain is possible. 

Here's the simulated future radar as of 11:30 a.m. from NOAA's HRRR model. 

hrrr_ref_frzn_ncus_fh1-18

In addition to torrential rainfall there is a threat for localized severe weather, primarily in far southern Minnesota, where tornadoes will be possible. 

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