textproduct: Indianapolis

KEY MESSAGES

- Hot and humid condition expected for much of the upcoming week with multiple days in the 90s and heat indices over 100 degrees

- Heat Advisory in effect Monday afternoon through Thursday

DISCUSSION (This evening through Sunday)

Issued at 231 PM EDT Sun Jun 28 2026

Skies remained partly to mostly cloudy across central Indiana this afternoon, and this will remain the case for the rest of the day. While broken cumulus will eventually scatter out late in the afternoon into early evening, high clouds will increase from dying thunderstorms to the northwest.

Will have to keep an eye out for the remnants of the upstream storms early this evening. They should weaken/dissipate as they approach the area, but it may take longer than the CAMs suggest per recent trends. Will keep the forecast area dry but continue to monitor.

Otherwise, a warm front with the hot airmass behind it will move across the area tonight. Forcing isn't great so am expecting mainly some clouds. However, can't rule out an isolated shower. Odds will remain below mentionable thresholds. With the moist atmosphere in place, some patchy fog may form again overnight. Lows will be in the lower to middle 70s.

On Monday morning, the warm front will be near or just east of the forecast area. A rogue shower will still be possible east, but again odds are too low to mention. The front will then exit to the east as the upper ridge builds across the area. The ridge should be strong enough to keep any storms riding around it east of the area Monday afternoon.

This ridge will persist across the area at least through Wednesday. The airmass will be a hot and humid one, with highs in the lower to perhaps middle 90s and dewpoints in the lower to middle 70s. This will produce afternoon heat indices of 100 to 105 for most areas with locally higher values. Given this, the Heat Advisory looks good and will make no changes at this time.

The ridge will may start to break down as early as Thursday, and by next weekend some guidance is showing an upper trough moving in. These will result in a return of chances of showers and thunderstorms.

Blended guidance is keeping highs in the 90s into next weekend, but that may be too warm given more clouds and increasing chances for rain with the upper trough.

AVIATION (18Z TAF Issuance)

Issued at 108 PM EDT Sun Jun 28 2026

Impacts:

- Ceilings return to VFR this afternoon

- Patchy fog possible, especially at KBMG, predawn Monday

Discussion:

Stratus will continue to lift into a broken VFR cumulus field this afternoon. These will scatter out late this afternoon into early evening, but then scattered clouds near or above 6000FT will persist through the night into Monday.

Partially depending on sky cover tonight, some patchy fog is possible overnight. Odds are highest at KBMG so will keep a mention there.

Winds will remain lower than 10kt for most if not all of the period.

IND WATCHES/WARNINGS/ADVISORIES

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