textproduct: Indianapolis

KEY MESSAGES

- Dry yet pleasant fall weather will prevail through this weekend

- Light winds and partly/mostly clear skies will oversee near to slightly above normal temperatures

DISCUSSION (Today through Monday)

Issued at 312 AM EDT Tue Oct 20 2026

Lovely autumn weather will continue to be the rule through the seven day forecast period, courtesy of broad, quasi-stationary ridging. Surface high pressure that has occupied much of the eastern two- thirds of North America..will be maintained from the MS Valley to Atlantic coast...while corresponding upper ridging builds across the continent, extending from central Mexico to eastern Canada by the end of the week.

Meanwhile in central Indiana, the lack of waves from the retracted jet will keep light to calm winds, which should display an overall veering from NE to SE this week as the surface ridge axis slides from the Great Lakes to the Appalachians. The building upper ridge's proximity from just west, to over the local region, will provide strong subsidence, maintaining an overall dry column. The only possibly impactful weather will be early morning fog, which would be favored in/near valleys along rivers and creek beds.

For latter portions of the period, an increasingly active northern jet stream will likely host a potent baroclinic system over central Canada this weekend. However, the only effects on the CWA through next Monday would be a more pronounced breeze ahead of the system's dragging / quasi-stationary cold front. High confidence in no precipitation through this weekend with the staunch surface ridge adjusting its alignment over the Deep South, blocking any organized return of Gulf moisture...and most likely directing any moderate rainfall with the northern system's front closer to WI/MI. Potential for a transition to colder conditions by the middle of next week.

AVIATION (12Z TAF Issuance)

Issued at 654 AM EDT Tue Oct 20 2026

Impacts:

- Brief MVFR in fog possible through 13Z today

Discussion:

Periods of MVFR visibility in fog are possible at outlying terminals through 13Z today and again pre-dawn Wednesday.

Otherwise VFR conditions will continue through Wednesday morning near central Indiana terminals as strong and broad surface high pressure remains parked over eastern North America. Weak and rain- free disturbance crossing from Illinois to the OH Valley will provide briefly SCT/BKN decks of high cloud through midday today...with SKC expected to return by 21Z.

Light/variable winds through 15Z will yield to east-northeast flow this afternoon and evening, sustained under 7KT.

IND WATCHES/WARNINGS/ADVISORIES

None.