National Weather Service United States Department of Commerce


A well-organized line of strong to severe thunderstorms developed early afternoon on Tuesday, September 7th, along and ahead of an advancing cold front. The line of storms tracked into southeast Michigan just after 2 PM EDT, in which tornado warnings and severe thunderstorm warnings were already in place as the storms crossed into the Detroit/Pontiac CWA. The line remained in tact north of the I-69 corridor; however, became a less organized, multi-cellular cluster as the second round of storms arrived farther south after 5 PM EDT. A majority of the damage was observed north of I-69 in cities such as Midland and Saginaw, where extensive tree damage, power outages, and 1" hail were observed; however, less widespread reports were received south of the I-69 corridor. The line of storms farther south was followed by a swath of high winds, where sustained winds (not associated with thunderstorms) were observed to be 40-50 mph, with gusts up to 60 mph. These winds necessitated the issuance of a High Wind Warning for the middle third of the CWA. The severe weather threat then concluded around 10 PM EDT. 

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