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 (18Z TAF Issuance)

Issued at 128 PM EDT Wed May 20 2026

Impacts:

- MVFR ceilings with rain at times, ending late this afternoon. IFR conditions at times at BMG

- MVFR ceilings continue overnight

Discussion:

A cold front has passed through central Indiana with all terminals observing north-northeasterly winds. Winds become more northeasterly with time as surface high pressure builds in to our north on Thursday.

Rain continues from HUF to IND southward, with heavy rain in the vicinity of BMG as of this writing. Rain is anticipated to diminish in intensity but continue to some extent through the afternoon.

MVFR ceilings persist at all terminals except LAF. A few breaks in the low-level clouds have occurred at HUF and IND with ceilings briefly at 3500 feet. Overall, MVFR ceilings will be more common through tonight. IFR conditions have occurred at BMG with the heavier rain, these will become MVFR as rainfall intensity decreases.

VFR conditions are expected to return on Thursday.

IND WATCHES/WARNINGS/ADVISORIES

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