Area Forecast Discussion

KEY MESSAGES

- Freeze Warning/Frost Advisory continue until 900 AM

- Warming trend begins on Tuesday, with above normal temperatures continuing into the weekend

- Rain chances Tuesday night into Wednesday and again Friday into the weekend

DISCUSSION (Today through Sunday)

Issued at 227 AM EDT Mon Apr 20 2026

Early This Morning...

Clouds lingering across the far southern forecast area may lower the odds of frost, with the clouds keeping temperatures up. However, with some decrease expected, can't rule out some patchy frost still forming near sunrise. Will let the Frost Advisory ride as is.

Today through Tuesday...

Surface high pressure will build into the area. Subsidence will keep skies sunny to mostly sunny, with perhaps some passing high clouds. Winds will be light with the high nearby. Temperatures will top out in the middle 50s to lower 60s.

Tonight, upper heights will rise some with an upper trough continuing to exit east of the area. The high will move off to the east, allowing light southeast winds. These will help bring warmer temperatures, with lows from around 40 to the mid 40s.

Warm advection will kick in on Tuesday, bringing a return to above normal temperatures in the middle 70s.

Tuesday night into Thursday...

A cold front will attempt to move into central Indiana as an upper wave moves through. Moisture doesn't look great with most of the Gulf cut off by high pressure. Will bring some slight chance to chance category PoPs in Tuesday night and linger them into Wednesday as the front lingers. Highs will be in the 70s.

Upper ridging will briefly build in for Thursday, providing dry and warmer conditions. Highs will be around 80.

Friday and beyond...

An upper trough across central portions of the country will eject impulses at times and keep chances for rain across the area Friday into early next week. At the moment, the best chances for rain look to be around Friday with a cold front. Uncertainty is relatively high after that on any specifics of PoPs or timing with differing solutions in how the upper impulses will move through.

Temperatures look to remain near normal to above normal, but those will depend on coverage and timing of any rain, as well as if any colder air gets pulled down from the north.

AVIATION (06Z TAF Issuance)

Issued at 1255 AM EDT Mon Apr 20 2026

Impacts:

- None

Discussion:

VFR conditions are expected through the period. Mid level clouds will exit the sites early in the period. Otherwise, mainly few to scattered high clouds will be around.

With surface high pressure building in, winds will be light through much of the period. Variable direction will become southeast this evening.

IND WATCHES / WARNINGS / ADVISORIES

Freeze Warning until 9 AM EDT this morning for INZ021-028>031- 035>049-054>057.

Frost Advisory until 9 AM EDT this morning for INZ051>053- 060>065-067>072.