textproduct: Indianapolis

KEY MESSAGES

- Heat Advisory in effect for all of central Indiana from Tuesday afternoon through Thursday evening

- Increasingly hot and humid conditions through the middle of this week. Peak heat index values up to 105 are possible each afternoon Tuesday through Thursday.

- Isolated to scattered thunderstorms will be possible at times late this week through the weekend.

DISCUSSION (Today through Monday)

Issued at 305 AM EDT Tue Sep 1 2026

Dry and hot weather conditions are expected through at least Thursday as ridging and surface high pressure are impacting the region. The surface high will place persistent southerly to southwesterly flow for central Indiana, allowing increasing hot and humid conditions. Highs are expected to be in the 90s through at least Thursday (possibly lingering into the start of the holiday weekend) with heat indices up to 105. Overnight lows will likely only drop to the 70s, providing little relief. A heat advisory is in effect from this afternoon through most of the day Thursday. Drink plenty of fluids, limit time outdoors during peak heating, and check up on relatives and neighbors.

Models show that the ridge will start to shift towards the end of the week, but uncertainty ramps up from Friday and beyond as the development of the upper pattern becomes questionable in the details. Overall, the upper high looks to get pushed west as an omega block pattern sets up across the country.

However, questions arise on the strength and locations of the upper troughs/lows on either side of the high across the central part of the country. This will have an impact on storm tracks and how much cooler air (cooler being a relative term) moves into the area.

For now, will allow a gradual cooldown from highs in the 90s on Friday to highs mainly in the 80s by Labor Day. Will have low PoPs at times at least through Sunday, but confidence is quite low on the specifics of these.

AVIATION (06Z TAF Issuance)

Issued at 157 AM EDT Tue Sep 1 2026

Impacts:

- None expected

Discussion:

VFR conditions will continue through the period, with high clouds from time to time. A few cumulus may pop up again on Tuesday.

Southwesterly winds may gust around 15kt Tuesday afternoon.

IND WATCHES/WARNINGS/ADVISORIES

Heat Advisory from 2 PM this afternoon to 8 PM EDT Thursday for INZ021-028>031-035>049-051>057-060>065-067>072.