textproduct: Indianapolis

KEY MESSAGES

- Clearing skies with a warming trend this weekend.

- Rain chances increase Tuesday night through Friday.

DISCUSSION (Today through Thursday)

Issued at 301 AM EDT Fri Sep 25 2026

Surface high pressure is building southwestward into Indiana, which has allowed stratus to diminish across the region. However, high cirrus is increasing due to a system over the Great Plains. Though this system remains to our west, high and eventually mid-level cloud cover could become thick at times this afternoon and evening. A few light rain showers cannot be ruled out either.

The upper-level pattern is blocked, with deep cut-off troughing over the eastern seaboard. This will keep the system over the Plains to our west, even causing it to retrograde somewhat. High pressure continues to build westward bringing clearing skies late Friday into the weekend. Patchy fog is possible at times Friday night and Saturday night, with ideal radiative cooling potential expected. Locally dense fog is possible as well.

Temperatures are expected to rebound towards normal values (low to mid 70s), with lows being a bit cooler than normal (mid 50s). Expect highs in the low to mid 70s with nightly lows in the upper 40s to low 50s.

NEXT WEEK

Guidance has trended away from a strong, wrapped up mid latitude low on Tuesday/Wednesday and more towards a weak wave passing to our north. Cloud cover and precipitation chances still increase, but strong thunderstorm potential has decreased. Ensembles have diverged regarding the overall pattern late next week, with some models showing a secondary wave developing Thursday or Friday. This wave may interact with moisture from Hurricane Polo, currently off the southern coast of Mexico. Given high model spread, forecast confidence is low. PoPs will be capped at chance for a broad timeframe...late Tuesday through Friday. This will be refined as guidance comes into better agreement.

AVIATION (12Z TAF Issuance)

Issued at 637 AM EDT Fri Sep 25 2026

Impacts:

- None

Discussion:

Cirrus is beginning to stream in from the northwest from a larger- scale system passing through the Plains. These clouds are expected to increase in coverage this morning. Mid-level clouds then increase during the day today, becoming BKN to OVC at times. An isolated shower cannot be ruled out. Cloud cover begins to diminish after 12z Saturday, with clear skies returning by late Saturday morning.

Winds retain an east-northeast component through the forecast period, with light and variable conditions possible during the overnight hours.

IND WATCHES/WARNINGS/ADVISORIES

None.