Dangerous, prolonged heat is ongoing in the Mid-South to Mid-Mississippi Valley and heat expands into the Northeast for a brief period today. Widely scattered instances of flash flooding due to heavy rains are forecast from northeast Kansas to much of Indiana. Scattered strong to severe thunderstorms are possible across parts of New England, northern Mid-Atlantic, and North Dakota. Read More >
Overview
A potent severe weather environment resulted in a swath of large hail up to 2.75" in diameter stretching from SE South Dakota up through southern Minnesota into west central Wisconsin. A surface low pressure tracked from the Dakotas through central Minnesota on the afternoon of April 28. Thunderstorms developed along the a dryline boundary early afternoon across western Minnesota and eastern South Dakota. Several severe thunderstorms formed along the dryline and moved eastward through southern Minnesota into western Wisconsin in the afternoon and early evening hours of April 28. A significant severe weather set up was in place across the Upper Mississippi river valley with moderate surface instability and strong shear present along and ahead of the dryline. Initial supercells would congeal into a line of severe thunderstorms as they tracked across south central Minnesota after 430 PM. This line would produce several tornadoes and numerous reports of large hail across southern Minnesota and western Wisconsin through the evening hours. In total, at least 2 tornadoes impacted southern Minnesota & 5 in west-central Wisconsin.
Tornadoes
Tornado - 8 ESE Faribault, MN Rice County
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Tornado - 3 E Morristown, MN
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Tornado - 1 NE Mondovi, WI
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Tornado - SSW Cleghorn, WI
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Tornado - 2 NNE Foster, WI Eau Claire County
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Tornado - 3 SSW Augusta, WI Eau Claire County
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Tornado - 4.7 N Fairchild, WI Eau Claire County
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The Enhanced Fujita (EF) Scale classifies tornadoes into the following categories:
EF0 Weak 65-85 mph |
EF1 Moderate 86-110 mph |
EF2 Significant 111-135 mph |
EF3 Severe 136-165 mph |
EF4 Extreme 166-200 mph |
EF5 Catastrophic 200+ mph |
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