The day isn't over yet, but there is a slight chance we will not hit 80 degrees today or tomorrow. That would make it the first such thermal occurrence since July 1st! Whatever the final mercury tally is, there's no mistaking the delightful change in air mass behind this weekend's cold front. Dew points which were pegged in the low 70s for the past week+ have tanked into the upper 40s, giving the air a much more autumnal feel from a moisture standpoint. Conditions should feel similar tomorrow, although by evening, some clouds may invade the sky, heralding the arrival of a mid-level disturbance which could bring a few showers by Wednesday morning. Moisture will be on the increase ahead of that feature and as we slip on the west side of the same high pressure system bringing us the relief, temperatures and dew points will be on the rise into the end of the week. This should be a transient return to the muggy stuff however, as a more progressive pattern should drive another cold front through Chicagoland Saturday morning. I'll offer some refinement to the timing of possible showers and thunderstorms with both features starting this afternoon at 4.
Mike
