We will close out July on a cooler than normal note with a few passing showers/thunderstorms in the forecast.
Northern Michigan continues to see what has been the status quo much of the summer. A northwest wind emanating from Canada keeping the humidity low but also our temperatures with no major heat anywhere close by.
The situation this week is a large trough which sits over the Eastern U.S. pushing the jet stream well south of the area preventing any heat/humidity from making it anywhere close to Northern Michigan. Rotating around this trough is some chilly air aloft along with weak disturbances. Each day this week through this Friday, we expect a few "spotty" showers or thunderstorms to bubble up once we get some heating in the afternoon hours. The daytime heating allows to air to rise into the cold air aloft creating clouds and a few showers/storms. They will not be widespread and some places may go all week without a drop of rain while others may see a shower or two each afternoon.
For Tuesday, we believe that any spotty showers/thunderstorms will be confined to the Lower Peninsula and mainly along/east of highway US-131. The stable air over Lake Michigan will keep the counties near that lake dry in what we call the "rain shadow" effect. With that in mind, there will also be thunderstorms over the Central U.P./Northeast Wisconsin that may survive a trip across Lake Michigan later in the day and brush areas from Leelanau County south including Frankfort/Manistee/Ludington with some rain in the late afternoon/early evening hours.
High temperatures Tuesday will sit below normal with a range from 67F at Sault Ste. Marie/Gaylord to 73F at Big Rapids/Mt. Pleasant.