textproduct: Indianapolis

KEY MESSAGES

- Showers and isolated thunderstorms this morning, diminishing this afternoon

- Temperatures falling today into the 50s

- Much cooler Sunday into Monday with the potential for patchy frost tonight followed by near freezing temperatures and more frost early Monday morning

DISCUSSION (Today through Friday)

Issued at 253 AM EDT Sat Apr 18 2026

Early This Morning through Today...

Convection continues to weaken across central Indiana early this morning. Will lower PoPs for a while, especially southeast. The old outflow is slowing down across the central forecast area while continuing to move east farther to the north. Some gusty winds and a temperature drop will occur behind that boundary.

With the surface cold front still to move through this morning and the upper trough still approaching, there should be enough forcing for additional showers to move across the area this morning. Will go with likely or higher category PoPs across much of the area after 12Z. However, PoPs will diminish from northwest to southeast during the day as the significant forcing exits. Some rumbles of thunder will be around, but no strong or severe convection is expected with the instability east of the area today.

Temperatures will fall today with cold advection, with perhaps some small rebound during the afternoon as clouds decrease some. Still, readings will only be in the 50s by then.

Tonight through Sunday night...

Clouds will continue to decrease tonight. Winds will diminish but not go calm. These conditions will allow readings to fall into the middle and upper 30s. Some patchy frost may form across the northern half or so of the area, especially in protected areas. At the moment, do not feel coverage will amount to the need for a Frost Advisory, but will watch trends closely.

Some upper energy and a secondary cold front could bring an isolated shower to mainly northern portions of the area on Sunday. Highs will be in the mid 50s to lower 60s.

Colder air moving in behind the front, clearing skies, and diminishing winds will bring lows in the lower to middle 30s to the area Sunday night. There is the potential for freezing temperatures north, and frost will be more widespread. There will likely be a need for Frost Advisory, and a Freeze Warning will not be out of the question in the far north.

Monday onward...

Quiet weather will continue Monday into Tuesday, but a weak front will bring low chances for rain around Wednesday. Better chances for rain arrive Friday into next Saturday with a potentially stronger surface cold front moving through.

Below normal temperatures will persist Monday, then above normal readings can be expected for much of the remainder of next week.

AVIATION (06Z TAF Issuance)

Issued at 1254 AM EDT Sat Apr 18 2026

Impacts:

- Wind gusts up to 20-25KT continuing through most of the period - Convective SHRA/TSRA likely...mainly within 06Z-15Z - MVFR ceilings for 4-6 hours at any terminal, crossing NW to SE within 11Z-19Z - Cold fropa will veer southerly winds to mainly SW by 12Z...and WNW/NW at all terminals by 17Z

Discussion:

Initial line has already impacted KLAF, and outflow from this line may impact KIND near valid time. Convection itself may take longer than expected to reach KIND/KHUF/KBMG as not much extends south of the initial line. Have delayed arrival and will continue to monitor.

Eventually, showers with embedded storms will be across the sites into the daylight morning hours. Coverage of rain will diminish by early afternoon but scattered showers will persist into the afternoon.

A wind shift will occur with the cold front, and gusty winds will persist.

IND WATCHES/WARNINGS/ADVISORIES

None.