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      Rain giving way to building humidity late this week

      Another round of beneficial rain is crossing Northern Michigan Tuesday with the humidity building into the weekend.

      Thanks to heavy rain early last week Alpena is running 2" above normal for the month. Interestingly, Sault Ste. Marie, Traverse City and Houghton Lake are all running below normal for August still for rain so any that does fall Tuesday will help.

      The rain Tuesday along with embedded thunder is being driven by low pressure interacting with a lot of available moisture in place in the atmosphere over Northern Michigan. Any showers Tuesday could drop a few heavy downpours across the region with high temperatures in the low/mid-70's.

      This system will slide east of the region Wednesday although we expect clouds to linger well into the afternoon with a few lingering showers.

      In what has been a rarity this summer, ridging and heat will build just off to our southwest later this week with a little bit of this trying to work into Northern Michigan this weekend. High temperatures as close as Milwaukee and Chicago along with southwest Michigan from Grand Rapids south will climb into the mid-80's to mid-90's Thursday into the weekend with the Heat Index at Chicago at or slightly exceeding 100F late this week/weekend. As usual, Northern Michigan will struggle to tap into this reservoir of hot air, but temperatures by the weekend will climb well into the 70's to even mid-80's locally. More impressive here will be the noted rise in humidity with dew points climbing close to 70F this weekend. There will also be the chance for scattered thunderstorms late this week into the weekend.