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      October 15: A Variety of Weather Extremes

      By the morning of the 15th, the system was near Milwaukee producing rain across Upper Michigan.

      October 15th features some weather extremes in Upper Michiganâ??s record books.

      In 1947 it was heat. Iron Mountain topped out at 88 degrees, by far the hottest for so late in the season. Ironwood reached a record-setting 84. This was all part of a remarkably warm October in 1947. Marquette ended the month 9 and-a-half degrees above the long-term average.

      In 1966 it was precipitation that made the weather headlines. A big storm developed over the Central Plains (Image 1 above) on the 14th and headed northeastward (Image 2). The system produced heavy rain along and just to the northwest of its track across the Great Lakes. Ironwood, Iron Mountain, Houghton and Munising all set daily rainfall records on October 15, 1966. Ironwoodâ??s 2.05 inches made it the wettest calendar day in the month of October. As the low moved across the far eastern U.P. enough cold air flowed in to produce snow as the precipitation wound down. A daily-record 2.7 inches of snow fell over the far-western U.P. to conclude this formidable autumn storm.

      So far, this month has featured warmth and, to some extent, wetness. Through the 14th, the mean temperature at the National Weather Service (NWS) near Negaunee is running 7 degrees above average. Precipitation is a little over a quarter inch above average. The pattern will be flipping. Before the next week to 10 days is through, we are likely to have a preview of the coming cold season.