textproduct: Indianapolis

KEY MESSAGES

- Scattered showers and storms possible later Wednesday afternoon into Thursday

- Some severe storms are possible Wednesday afternoon and evening

- Dry weather returns for late week into the weekend

- Hotter and more humid air arrives Sunday into early next week

DISCUSSION (This evening through Tuesday)

Issued at 252 PM EDT Tue Aug 25 2026

Rest of This Afternoon through Tonight...

Quiet weather will continue through the period, with surface high pressure in control. Scattered cumulus will dissipate this evening, but there will be some increase in high and perhaps mid level clouds by morning.

The weak lift ahead of an approaching trough that will increase the cloudiness overnight will also try to bring some light showers to the northwest portion of the area toward sunrise. The lower atmosphere should remain dry enough to evaporate any rain that forms, so will continue a dry forecast.

Lows tonight will generally be in the upper 50s to lower 60s.

Wednesday and Wednesday night...

The initial round of high and mid clouds and potential virga will move across the area early Wednesday. An upper trough and surface cold front will move into the area through Wednesday night. Best forcing will remain north of the area closer to better upper energy.

Advection on the west side of the surface high will bring in upper 60s to around 70 degree dewpoints. With highs in the 80s, decent instability will build. Shear will increase as the upper trough moves in, especially north.

The combination of these will lead to a severe weather threat mainly 400 PM to Midnight. Damaging winds and large hail will be the primary threats, but with the higher shear north, isolated tornadoes will be possible in the northern third or so of the forecast area.

With the best forcing north of the area, will keep PoPs in the chance category and used scattered coverage wording.

Coverage will diminish Wednesday night as the front sags south and instability diminishes.

Thursday...

The front will linger in the southern forecast area, so will keep some lower PoPs there. Decent shear/instability looks to remain east of the area, so not expecting any severe weather on Thursday. Highs will be in the lower to middle 80s.

Friday and beyond...

An upper ridge will push its way into central Indiana for much of this period. The result will be warming temperatures, with highs in the middle 80s to lower 90s common by Sunday. Heat indices will rise into the lower to middle 90s early next week.

The ridge should keep the area dry through the day Monday. Uncertainty on how the upper pattern evolves leads to some low PoPs for Tuesday, but confidence is low.

AVIATION (18Z TAF Issuance)

Issued at 111 PM EDT Tue Aug 25 2026

Impacts:

- No aviation impacts are anticipated with light winds trending southerly to southwesterly late in the period. VFR conditions expected.

Discussion:

High pressure is moving over the area currently leading to light winds. Diurnal CU have developed with bases between 4000 and 5000 ft. These will dissipate with loss of daytime heating. Overnight and into tomorrow morning, as the surface high shifts to the east, winds become southerly and then eventually southwesterly less than 10kts.

IND WATCHES/WARNINGS/ADVISORIES

None.