Tale of Two Rainfall Patterns Emerging Thus Far across Southeast Lower Michigan This Summer of '17

Stark differences in rainfall amounts have begun the Summer of '17 across much of Michigan so far this June.

Flooding rains occurred over the Saginaw Valley north-northwest into Mid-Michigan this past week while further south across much of Southeast Lower Michigan (south of I-69); rainfalls remain mainly below normal, some areas well below for June. Driest areas and largest departures below normal extend from the Metro Detroit and Ann Arbor areas, south to the border with some areas seeing just 25% of the normal rain for the month.

A picture (or two) says a thousand words: Look at the difference in rainfall and departures across Lower Michigan, especially from Mid Michigan to the Indiana and Ohio Borders!

An almost unbelievable contrast in rainfall amounts can be seen, especially with the torrential rains that just occurred in mid-Michigan. Rainfall totals of 10 to 15" for the month have been observed (normal rainfalls lie around 3 inches for the entire month). Rainfall departures in these areas mount in upwards of 300+% of normal! The heaviest corridor of rain extends from Mid Michigan across Lake Michigan into a large portion Upper Michigan and Wisconsin. The run-off of the heavy rains should help keep Upper Great Lakes into the Lower Great Lakes levels high for the summer, if not add to them.

Latest forecast for the Great Lakes, Lake St Clair and adjoining rivers from the Corp of Engineers:

Many areas are several feet above low water datum and also above their long term averages.

Making weather fun while we all learn,
Bill Deedler -SEMI_WeatherHistorian


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