textproduct: Indianapolis

KEY MESSAGES

- Mostly sunny skies this weekend with seasonable temperatures.

- Patchy fog possible each morning through Tuesday morning.

- Dry conditions persist through Tuesday, with the next chance for rain arriving Wednesday and then continuing into the weekend.

DISCUSSION (This evening through Saturday)

Issued at 210 PM EDT Sat Sep 26 2026

Rest of This Afternoon through Tonight...

Quiet weather will continue through this evening with just some high clouds at times across portions of the area.

Tonight, there will be some high clouds from the west again. Winds will diminish. With these conditions, expect patchy fog to form once again. Short term guidance focuses the fog on the northeast forecast area again, but feel that, if the cirrus is thin enough west, patchy fog will be able to form farther west.

With the expected conditions, nudged guidance's low temperatures down a bit in some areas. Lows will be mainly in the 40s.

Sunday through Tuesday...

Subsidence to the west of a large upper low across the eastern USA early followed by some upper ridging moving in will keep the weather quiet across central Indiana during this period. At the surface, high pressure will remain in control.

Some high and mid clouds will continue across the western forecast area. Sunday night and Monday night, some patchy fog will likely develop once again with similar conditions to tonight.

Temperatures will gradually warm to above normal as the airmass moderates and winds become southerly.

Wednesday onward...

A slow moving weakening upper system will move northeast into the central USA by Friday. At the surface, an associated meandering surface front will linger across the area.

The result will be rain chances across central Indiana. Questions remain though on the speed of the system and how much forcing will be across central Indiana during any one period. Thus confidence is low on the specifics of the PoPs and when the highest chances of rain will be. The upper system will have ingested tropical moisture, so depending on where the surface front sets up, locally heavy rain may be possible for parts of the area by Friday.

For next weekend, guidance differs on the next larger upper trough, keeping uncertainty high. Will continue with some PoPs into Saturday.

Above normal temperatures look to continue into Thursday, but readings a little below normal could return Friday into Saturday depending on rain coverage/sky cover/where the front ends up.

AVIATION (18Z TAF Issuance)

Issued at 103 PM EDT Sat Sep 26 2026

Impacts:

- Patchy fog possible overnight into Sunday morning.

Discussion:

Some passing high and mid clouds will be around through the period, especially at KHUF. Winds will remain east/northeast at 10kt or less.

During the night, winds will diminish. Expect patchy fog to form. Other than the usual uncertainty with patchy fog, questions about how much cirrus will be around increases uncertainty for at least KHUF. The urban heat island should keep KIND VFR regardless.

Will continue to use a TEMPO for MVFR fog at all but KIND. Cannot rule out IFR but am not confident enough to include.

IND WATCHES/WARNINGS/ADVISORIES

None.