textproduct: Indianapolis

KEY MESSAGES

- A Flood Watch remains in effect until 2pm today across south central Indiana

- Cooler mid week with a brief break from rain chances, before showers and storms return to the forecast late week into the holiday weekend

DISCUSSION (Today through Tuesday)

Issued at 332 AM EDT Wed May 20 2026

Today -

Precip along the cold front slowed southward progress this evening, but the boundary will continue to slowly sag through the region today. Upper level waves moving along the front will produce additional showers and a few thunderstorms today, primarily across the southeastern half of the area, and mainly through mid afternoon before rain chances rapidly taper off across the area.

Will maintain the flood watch in place across the south given this expectation and continued plentiful deep moisture through midday. Relatively minimal instability will limit coverage and intensity of thunderstorms, with no severe weather expected.

Tonight through Tuesday -

High pressure will produce cooler conditions through much of the rest of the work week, with rain chances returning as a broad upper level low and associated shortwave disturbances pull a warmer and moist airmass back into the region. Model agreement is fairly high on what may end up being a washout on Friday, though discrepancies increase quite a bit beyond then. Blend PoPs have increased in the past 24 hours for the holiday weekend, though there is significant uncertainty in coverage at any one time, and changes are likely in the coming days. Nonetheless, rain chances and above normal temperatures will characterize the coming holiday weekend into early next week.

AVIATION (12Z TAF Issuance)

Issued at 646 AM EDT Wed May 20 2026

Impacts:

- Showers and a few thunderstorms, primarily from HUF/IND southeastward

- Widespread MVFR ceilings with periods of IFR at BMG

Discussion:

A front has slowly moved just to our southeast overnight but continues to produce showers across the southeastern half of the area, and will do so much of today. A rumble of thunder cannot be ruled out but is too low probability for inclusion in the TAF.

Trapped low level moisture is producing widespread MVFR ceilings with some IFR in far southern portions of the area. Most sites will remain MVFR at worst but periods of IFR are likely at BMG.

Winds will generally be northerly early in the period, becoming more northeasterly with time. A gust or two cannot be completely ruled out, mainly at LAF, but is likely to be too sporadic for inclusion.

IND WATCHES/WARNINGS/ADVISORIES

Flood Watch until 2 PM EDT this afternoon for INZ052>055-060>064- 067>072.