From warm to cold to warm again.

LONG TERM /Tuesday through Friday Night/...

Issued at 341 AM EDT Sat Oct 17 2020

Synoptic setup early in the extended period consists of a stationary
frontal boundary extending from the Southern Plains northeastward
through the Ohio Valley and into New England.  This will provide
some weak forcing across the southeast two-thirds of central Indiana
early Tuesday for low rain chances.  Moisture will be limited
though, and all of central Indiana is progged to be dry by Tuesday
afternoon.  Nonetheless, there will be a quick uptick in rain
chances from Tuesday night into Wednesday when a surface frontal
system moves through with a 50-60 kt low level jet in its warm
sector. Meanwhile, weak troughing aloft will move through the
Great Lakes Region. After that though, any upper forcing will
be limited until late in the extended period when the next trough
moves through from Thursday night through Friday night. So, any
low precipitation chances from Wednesday night through Thursday
will only be fueled by a lingering surface frontal boundary, and
these chances are low confidence.

Meanwhile, strong warm advection in the aforementioned warm sector
will bump daytime highs into the upper 60s/low 70s on Wednesday
and even low to upper 70s on Thursday. The cooler weather,
however, will return over the weekend after a cold front drifts
through central Indiana.