9/7 – Rob Knight’s “Labor Day” Morning Forecast

The continental airmass, in the wake of the weak cold front that moved mostly off our coast has made for a very noticeable drop in relative humidity levels this past weekend. The residual dry air, mostly clear skies will continue today, however some periods of higher dew-points near or above 70 will likely move back north over areas south of the interstate. A bit more humidity will return due to more east to southeast winds Tuesday. Sea-breeze boundaries and a return of moisture flow should bring isolated to scattered, diurnally driven showers and thunderstorms to most areas Tuesday and that trend should continue into Wednesday with even higher coverage of showers and thunderstorms expected.

Sorry to be the bearer of bad news for those wanting a strong cold front, but that is now unlikely for the frontal boundary that should approach and move into the forecast area Friday or Saturday. The models today really have shifted the parent low that drives the cold front on a more northern track across Nebraska/South Dakota and the upper Mississippi valley late Friday and Saturday. This means while there may be some drier air in northwest portions of the forecast area, the confidence is too low to remove rain chances from the afternoon forecast periods through the weekend. This also means temperatures will either be near normal or slightly above normal.

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