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Event Summary

A powerful arctic cold front surged across the Midwest eventually reaching Michigan by late day Thursday December 22nd. As this occurred, low pressure began to develop along the front over the northern Ohio Valley. This low rapidly deepened, undergoing bombogenesis, as it lifted through the central Great Lakes into southern Ontario Friday December 23rd. System slowly drifted north over the remainder of the weekend maintaining the extremely tight pressure gradient over the region resulting in a long duration of strong winds and a robust lake effect response.

The bulk of initial precipitation ahead of the arctic cold front fell as rain before rapidly transitioning to snow in the immediate wake of the frontal passage. This combined with the progressive nature of the low limited snow with the multiday scattered lake effect snow showers instead generating the bulk of snowfall amounts seen (see Snowfall tab for 3 day totals). 

Rather, the primary impact of this system was the wind and cold. Temperatures rapidly fell overnight Dec 22nd into the morning of Dec 23rd with all of southeast Michigan seeing a 35-40° temperature drop resulting in a flash freeze of earlier rainfall. For example: Detroit Metro Airport went form 40°F at 11pm Dec 22 to 1°F 10am Dec 23. The still 'warm' (relatively speaking) Lake Michigan helped to blunt this airmass keeping the core of the arctic airmass to our south over the Ohio Valley. That said, temperatures remained in the single digits (both positive & negative) to positive low teens from Dec 23-25, which combined with wind gusts of 35-60mph (see Wind tab for reports), resulted in windchills ranging from the positive single digits to negative teens.

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