9/21 – Rob’s “Cold Frontal Passage” Tuesday Afternoon Forecast

A disturbance moving through the Great Plains this morning will be over the Ohio River Valley by midday. The cold front associated with this disturbance is expected to move across our area Tonight/Wednesday. The airmass ahead of this system is already drier than what we’ve had across the area for the last week, so showers and thunderstorms today are expected to be less numerous than what we’ve seen over the last few days. It won’t be completely dry today, but most areas shouldn’t see much in the way of showers/storms until the afternoon hours.

The most welcome part of the forecast will be the much cooler and drier weather behind the front. Dew points in the lower and middle 70s today will fall into the 50s by Wednesday afternoon, and could even be in the upper 40s across the north on Thursday afternoon. High pressure at the surface will extend from New England southwestward into Texas on Friday with northwesterly upper flow. That pattern should keep the local area dry through the weekend and likely through Monday. With the high-pressure just to the east of the area, we’ll see a very slow moderation in temperatures beginning Saturday.

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