textproduct: Indianapolis

KEY MESSAGES

- Visibility reductions in patchy fog through 8-9 AM this morning

- Quiet pattern continues through Wednesday amid light winds and near to slightly below normal temperatures/humidity

- Generally humid, seasonably warm w/occasional rain/storm chances Wednesday night into next week...rain most likely Thursday-Friday

DISCUSSION (Today through Monday)

Issued at 302 AM EDT Tue Aug 4 2026

Today and Tonight...

The short term will present a near-carbon copy of the previous 24 hours as weak surface high pressure continues to drift east within the northeastern quadrant of the CONUS...while maintaining its low- gradient and narrow axis over central Indiana. Expect areas of fog to present patches of quick changes in visibility through 8-9 AM EDT...albeit less organized than early Monday, courtesy of the August sun drying ground moisture through the early week. Otherwise the period will be marked by unseasonably light winds and slightly below normal temperatures and humidity.

Mainly clear skies early today will again trend to an increasing cumulus field by afternoon...with highs this afternoon ranging from the low 80s along and northeast of the I-74 corridor...to mid-80s near and south/west of Monroe County. Fair weather will continue into tonight amid calm winds under mostly clear skies. Expect overnight lows to range from 59F near Kokomo to 64F in Vincennes and Seymour.

Wednesday...

Influence from an upper low to the southeast of central Indiana looks to remain out of the area, and forcing from an approaching upper trough/surface cold front will remain northwest of the area during the day. Will continue a dry forecast.

Highs will generally be in the middle 80s.

Wednesday night through Saturday...

The large upper trough will move into the area at into Saturday. Various shortwaves will move through this trough, with the axis of the trough not moving through until about Saturday. These will bring rounds of forcing. At the surface, a front will meander near the area. The combination of these will be enough to keep PoPs around through this period.

Although some uncertainty remains in the timing of the best forcing, for now odds still favor Thursday afternoon and night.

Dewpoints returning into the 70s by Friday will help increase the instability, but odds for severe storms look low for now. Will continue to keep an eye on it though in case one of the shortwaves becomes stronger than currently expected.

Sunday and beyond...

The upper ridge across the western USA may nudge its way into the area on Sunday into early Monday, lowering the chances for rain. However, by Monday night it may retreat enough to put central Indiana in line to get convection from storms riding around the ridge.

Highs will be in the middle and upper 80s, with perhaps some readings around 90 south depending on what the ridge does. With the higher dewpoints in place, heat indices may approach 100 degrees on Monday.

AVIATION (06Z TAF Issuance)

Issued at 137 AM EDT Tue Aug 4 2026

- MVFR/worse in BR/fog expected at KLAF/KHUF/KBMG through 13Z

Discussion:

Central Indiana will find itself amid the late-summer doldrums of persistent light winds...with Indiana positioned within low-gradient proximity between stronger upper trough over interior North America and a shrinking cut-off low over the southern Appalachians...with small axis of remnant surface high pressure draped over the Midwest through the TAF period. Winds at 3KT or less will prevail at most terminals through Tuesday evening...with flow mainly 5KT/less also at KIND after 10Z this morning.

Greatest resultant impacts will be increasing coverage of BR through pre-dawn hours...with MVFR/worse expected by 08Z-09Z...except at KIND where light easterly/urban flow will keep relative humidity values moderated. FEW/SCT cumulus to return by this afternoon under passing high clouds.

IND WATCHES/WARNINGS/ADVISORIES

None.