National Weather Service United States Department of Commerce

Severe Thunderstorms Wednesday in the Upper Midwest; Excessive Heat in the Central U.S.

Thunderstorms associated with severe wind gusts, large hail to very large hail, flash flooding, and a couple tornadoes will be possible Wednesday afternoon and night across parts of the Upper Midwest and extending into the southern Great Lakes. Excessive heat covers much of the central third of the country and is expected to persist into the weekend over the south-central states. Read More >

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Tropical Cyclone Watch/Warning Break Points 

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Saffir-Simpson Scale
  • Tropical Storm - winds 39-73 mph (34-63 kt)
  • Category 1 - winds 74-95 mph (64-82 kt)
  • Category 2 - winds 96-110 mph (83-95 kt)
  • Category 3 - winds 111-129 mph (96-112 kt)
  • Category 4 - winds 130-156 mph (113-136 kt)
  • Category 5 - winds 157 mph and up (137+ kt)


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