textproduct: Indianapolis

KEY MESSAGES

- Dry and unseasonably high temperatures to continue through Friday, afternoon highs in the 70s

- Patchy fog may occur in low lying areas tonight into tomorrow morning.

DISCUSSION (This evening through Tuesday)

Issued at 249 PM EDT Tue Oct 27 2026

The Ohio Valley still remains beneath the influence of a strong area of high pressure over the SE CONUS. That said, troughing and continued CVA over the Upper Mississippi Vally this week will work to break down the ridge resulting in a slowly progressing long wave pattern throughout the long term. In the meantime, broad subsidence and surface high pressure to the east will keep conditions quiet through the work week.

Winds will remain weak today, but starting tomorrow, slight increases in the pressure gradient due to pressure depletion over the Plains and Upper Midwest will allow for a more consistent light breeze out of the S/SW. This should start to mitigate the diurnal fog development we've been experiencing over the last few nights. On Thursday, there should be enough mid to low level flow and an increase in PBL mixing for occasional gusts of 13-17kt during the afternoon. This consistent SW flow will also provide a slight warming trend with afternoon highs approaching 80 by Thursday.

Ensemble guidance is starting to pick up on the development of a modest 850-700mb low late Friday through Sunday passing through the Ohio Valley late Saturday into Sunday. While uncertainty on magnitude and placement is still high, there is enough mid level moisture return to warrant increase PoPs for Saturday night. Cannot rule out rain for Saturday evening, but there should be enough antecedent dry air to evaporate initial rainfall attempts holding off measurable rain until well into Saturday night.

As the ridge breaks down late this week through the weekend, a more progressive longwave pattern is expected to develop. This will likely place deeper troughing over the central CONUS by early next week with increased chances for precipitation and larger temperature fluctuations likely for central Indiana to begin November.

AVIATION (18Z TAF Issuance)

Issued at 106 PM EDT Tue Oct 27 2026

Impacts:

- Patchy MVFR Fog tomorrow morning at KLAF

Discussion:

Surface high pressure remains across the region with weak upper waves passing to the west. This is resulting in VFR conditions with SCT to BKN cirrus throughout the TAF period. Due to calm winds overnight, patchy MVFR fog is possible at KLAF and KHUF tomorrow morning, but confidence in duration and coverage is low at this time.

Winds tomorrow will increase slightly out of the SW. Occasional gusts to 15kt cannot be ruled out, but look sporatic enough to avoid inclusion.

IND WATCHES/WARNINGS/ADVISORIES

None.