Here's the latest thinking from the National Weather Service:.Long Term...(Thursday through Tuesday)
Issued at 300 PM EST Tue Dec 28 2021 Thursday Through Thursday Night. Rain will come to an end across central Indiana late Wednesday night as the forcing associated with an 850 to 700mb jet exits the area. Dry weather then briefly returns for Thursday but with the polar air locked well into Canada, temperatures look to remain well above average. Model soundings still show moderate saturation at the mid levels, so expect at least partly cloudy skies to continue through the overnight hours before the thicker clouds arrive Friday. Friday Through Tuesday. The next rain producing system will move out of the Southern Rockies and track to the northeast Thursday into early Friday with precipitation for central Indiana beginning Friday afternoon. Confidence in the track of the low has increased but there remains many of the mesoscale features that remain uncertain that will impact the axis of heaviest rain or the threat for thunderstorms. Current thoughts are the axis of heaviest precipitation will be south of the Ohio River with northerly surface flow across much of the area. This will keep central Indiana out of the warm sector and keep thunder or strong storm threats to near zero. If the track inches northward a bit, the southern counties could see a few thunderstorms. A weak TROWAL may allow for some snow to mix into the northern counties Saturday into early Sunday after the initial round of rain, but confidence in both the strength of the TROWAL and how could the airmass is are both low at this time. High pressure and seasonable weather then arrives Monday into Tuesday as high pressure builds across the area.
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