One of the heaviest, most wide-spread rains on record hit much of Upper Michigan starting 73 years ago today.
On August 28-29, 1941, a low-pressure area and associated warm front induced the development of drenching rain from west to east across the entire peninsula. One-day totals included 3.27 inches at Watersmeet, over 2 1/2 inches at Ontonagon and L'Anse, with nearly 4 inches in the east at Newberry and over 4 inches at Iron Mountain. Stephenson in Menominee County was soaked with a whopping 4.85 inches on August 28, 1941. Total rain for the entire event fell just shy of 6 inches (5.97) at Iron Mountain.
Interestingly, Iron Mountain recorded three low temperature records prior to the big rain in August 1941. The day before the big rain, Sault Ste. Marie had a record low of 41 degrees.This morning, it got quite cold in some spots. An observer north of Ishpeming had 33 degrees with light frost and Spincich Lake in Luce County registered 30 degrees. Our current chill will be followed by a widespread rain event. Low pressure over the Plains will slowly move northeastward over the couple of days. It has a good deal of moisture to work with. Our in-house RPM model forecasts a swath of heavy rain over the central and southeastern U.P. Like in 1941, this model forecasts the heaviest rains (around three inches) near Iron Mountain (Image above). The other models place the heaviest band of rain in slightly different locations, but the general theme is that a hefty rainfall event will affect at least parts of Upper Michigan as we begin the Labor Day holiday weekend.