textproduct: Indianapolis

KEY MESSAGES

- Dry and comfortable through midweek

- Rain and storm chances return Wednesday night into the first half of the weekend

- Hot and humid conditions increasingly likely by early next week

DISCUSSION (Today through Monday)

Issued at 248 AM EDT Tue Jun 23 2026

Skies have cleared early this morning as high pressure settles in across the region. 06Z temperatures ranged from the mid 50s to lower 60s.

A much needed respite from the recent active weather is expected through Wednesday as high pressure slides across the Ohio Valley. A broad upper level trough will shift east through midweek... eventually transitioning to a quasi-zonal regime that will reintroduce an unsettled pattern as a frontal boundary becomes trapped over the Ohio Valley by early Friday. The front will be forced north of the region by late weekend as deep ridging encompasses the Mississippi and Ohio Valleys with a transition to hot and humid conditions by early next week.

Today through Thursday

Sunshine returns today with the high expanding over the region. There remains a hint of a low level convergence axis across the eastern half of the forecast area which may serve as a focal point for scattered cu development for this afternoon...but expect a gradual diminishment of coverage towards late day as progressively drier air advects into the area. The high will linger over the region into Wednesday with a more pronounced return flow advecting higher dewpoints delayed until the evening ahead of an upper level wave.

Despite less than optimal moisture initially...model soundings do show weak instability aloft developing Wednesday night which should support scattered convection as precip water values rise throughout the night. The primary concern from any thunderstorms will be locally heavy rainfall as PWATs rise to around 1.50 inches by daybreak Thursday. Weak surface ridging will follow in the wake of the convection which should keep most of Thursday dry across the forecast area. The approach of a warm front from the west by late day may allow for renewed convection in advance of more widespread rain and storms for Thursday night.

Highs will be comfortable over the next three days as they slowly return to near normal levels...rising from the mid and upper 70s today to the low to mid 80s by Thursday.

Thursday Night through Monday

The next round of moderate-heavy rainfall and at least a few t- storms should advance east across the region Thursday night, with a supporting, smaller area of low pressure resembling the recent Sunday evening episode in scope and position of track, yet noticeably lower shear/helicity and perhaps near-zero instability which should prevent a more substantial severe weather threat. That said, flash flooding will again be on the table, and possibly through this nocturnal period with moderate certainty the system's precipitation maximum, in excess of 2.00 inches, crosses the CWA and lower confidence so far in which counties this will intersect.

Unlike recent active weather, the Thursday night round should not be followed by a cooler Canadian flow as strengthening surface low pressure over the central/northern High Plains promotes a quasi- stationary boundary lingering across the central US and likely east to near the local region. This feature should combine with better deep Gulf moisture supplied by flow out of stagnant surface high pressure over the SE CONUS to provide frequent periods of showers, and often diurnal convection late week into the weekend. Widespread flooding concerns are not expected Friday-Saturday, but local ponding of low-lying areas and minor flooding is certainly on the table given possible training of steadier rain amid the stagnant front.

Rain and convection will push northeast of the region by Sunday, replaced by high humidity and southerly breezes boosting afternoon readings to near 90 degrees and maximum heat indices towards Advisory thresholds by the end of the forecast period.

AVIATION (06Z TAF Issuance)

Issued at 105 AM EDT Tue Jun 23 2026

Impacts:

- Brief visibility restrictions possible at KBMG predawn through daybreak

Discussion:

Remnant clouds have largely diminished early this morning as high pressure expands into the region from the northwest. Cannot rule out patchy fog impacting KBMG over the next several hours through daybreak otherwise mostly clear skies are expected with light N/NW winds.

Drier air will advect into the region later today but subtle convergence lingering across the eastern half of central Indiana may promote scattered diurnal cu development for this afternoon. Cu will dissipate this evening. Northerly winds to around 10kts later today will diminish to 5kts or less this evening.

IND WATCHES/WARNINGS/ADVISORIES

None.