weather conditions for Porkies ?

I'm probably not the best one to field this. I tend to do a bit of preplanning based on historical data then tweek my kit to react to the forecasts about a week out once data sets are firming up.

If you want to try to hazard a guess based on historical data, wunderground had the easiest tool I found currently:
www.wunderground.com/history/ (in your case KCMX is a close airport code)

After that now that we are actually closer to predicted color peaks I would hit up 1-2 of the national websites:
(7 Day for the area)
forecast.weather.gov/MapClick.php?zoneid=MIZ002
(10 Day for the area)
weather.com/weather/5day/l/Porcupine+Mountains+Wilderness+State+Park+MISPPW:13:US

Then try to find something local, as they might hazard a guess for further out, sometimes they differ from the national predictions based on their experiences with local patterns, and sometimes they get it right because of this:
(look up websites for Duluth stations)
en.wikipedia.org/wiki/List_of_television_stations_in_Minnesota
(look up websites for Marquette stations)
en.wikipedia.org/wiki/List_of_television_stations_in_Michigan