We are beginning the transition over to a hot humid air mass and as a result we are seeing high clouds streaming eastward. Showers and thunderstorms are occurring over the Great Lakes but the transition here looks to be a rain free one. Weather conditions tonight are fine with just some high clouds passing through and temperatures in the 60s to near 70 for lows. Humidity levels are moving higher however and it will become a bit more uncomfortable on Sunday though it will not be unreasonable.
Starting Monday it will be heat and humidity combining to make it very uncomfortable and it will peak Tuesday and Wednesday. Highs Monday should reach the upper 80s and lower 90s. Tuesday and Wednesday highs will hit 90 to 95. Dew points which are used in calculating humidity are going to be miserably high reaching into the 70s.
As far as thunderstorms are concerned there is the possibility of some scattered activity Monday and Tuesday afternoon but widespread thunderstorms are unlikely this time around as an upper high in the East keeps the atmosphere more stable so thunderstorms should be few and far between. Considering how wet this month has been, at least we won't have to worry about widespread rains this week.
As far as the Labor Day Weekend is concerned there are some questions as the next cold front passes through here on Wednesday and stalls to our south. For more on this go to METEOROLOGISTJOECIOFFI.COM for the first call on the last vacation weekend of the summer.