textproduct: Indianapolis

KEY MESSAGES

- Pleasant Weather through Wednesday afternoon.

- Scattered showers and storms possible Wednesday evening into Thursday.

- Dry weather returns for late week into the weekend.

- Hotter and more humid air arriving Sunday into early next week.

DISCUSSION (Today through Monday)

Issued at 240 AM EDT Tue Aug 25 2026

Surface analysis early this morning shows strong high pressure in place from SRN WI across Indiana to WVA. GOES19 shows clear skies across Indiana. Aloft water vapor shows high pressure in place over the American SW with ridging extending north, across the high plains to MN. This continues to provide subsidence across Indiana. Dew points were in the comfortable 50s.

Today...

Ridging aloft to the northwest is expected to push east into the Great Lakes today, keeping Indiana and Ohio under the influence of high pressure. Forecast soundings today and tonight show a dry column as the surface high passes with an inversion aloft. This will lead to mostly sunny skies today and mostly clear skies tonight, with temperatures near or slightly below seasonal normals.

Wednesday...

A trough within the quick upper flow will be pushing through the Great Lakes on Wednesday, providing the best forcing there. Weaker forcing will be found across Indiana. A cold front associated with the trough looks to pass across the area on late Wednesday night. Forecast soundings through the day show little in the way of lower level saturation, but do show mid and upper level saturation. Afternoon instability appears weak. Thus confidence for any rain on Wednesday appears low, but better chances will be in play on Wednesday night with the cold front passage.

Thursday...

Models suggest a broad trough in place aloft by Thursday, extending from Ontario, across Indiana to the Tennessee River Valley. The cold front will have exited to the by Thursday, however forecast soundings suggest diurnal convection will be possible attainable convective temperatures and some CAPE in play. thus a few scattered showers and storms will be possible on Thursday.

Friday through Monday...

Surface high pressure will be building across Indiana in the wake of the previous frontal boundary, leading pleasant weekend weather. The upper pattern suggests weak ridging aloft over the high plains and into central Canada, leading to lee side subsidence across the Great Lakes and Ohio Valley. Forecast soundings on Friday through Sunday suggest a very dry column with no CAPE available along and a mid level inversion in place. Thus dry weather with mostly clear skies will be expected through the weekend. With easterly surface flow on Friday slowly moderating to SW flow by Sunday, high temperatures on in the lower 80s in Friday to the upper 80s on Sunday.

Chance for showers and storms will return on Monday as cold front approaches from the northwest. A mid level thermal ridge appears to be in place ahead of the front, pushing toward Indiana, and very early forecast soundings suggest CAPE available in the afternoon with diurnal convection possible. Thus pops at that time look reasonable with another day in the upper 80s ahead of the cold front.

AVIATION (12Z TAF Issuance)

Issued at 553 AM EDT Tue Aug 25 2026

Impacts:

- Fog at the outlying TAF sites early this morning; Otherwise VFR.

Discussion:

Patchy Fog at LAF, HUF and BMG has resulted in some MVFR/IFR conditions. This fog will quickly burn off as daytime heating resumes, leading to a return to VFR conditions.

Strong Surface high pressure will remain in place across Central Indiana during this TAF period. Forecast soundings through the period remain quite dry and convective temperatures will not be met. Thus will result in mostly sunny skies through the period.

IND WATCHES/WARNINGS/ADVISORIES

None.