Marine Weather and Tide Forecast for Indianapolis, IN

.DISCUSSION (Today through Thursday)...
Issued at 243 AM EDT Fri Apr 17 2026

Early This Morning...

Satellite and observations show fog overspreading portions of northern Indiana. There hasn't been much trend southward for the widespread and dense fog. Guidance isn't bullish on fog either for central Indiana. With Lafayette already dipping down below 6SM, will include a mention of patchy fog in portions of the northern forecast area before sunrise.

Today...

Near record temperatures are possible today across the area. Warm advection and mixing will lead to high temperatures in the lower and middle 80s. 850mb temperatures are at or above the 90th percentile.
Indy's record is 87 degrees, set in 1896. Readings won't get that high, but they could get within 4 degrees or so of that record.

A surface trough/warm front will move across the area today and could create some isolated convection across the southwest third or so of the area this afternoon into early evening.

Tonight and Saturday...

A large upper trough will move into the area with a strong surface cold front ahead of it. Good moisture advection will pump moisture into the area (Integrated Vapor Transport fields are near 30 year climatological maxima for this time of year). Forcing and moisture will lead to convection moving across central Indiana, especially overnight into Saturday morning.

Shear and instability will allow convection to become severe west of central Indiana late this afternoon and into this evening. Depending on the strength and organization of the cold pools with this convection, severe storms may survive into mainly western portions of the forecast area late this evening into the early overnight.
Damaging winds will be the primary threat, but isolated tornadoes will be possible as well in any spin-ups in the line of storms.

Convection will continue but weaken as it moves east overnight.
Locally heavy rain will be possible given the moisture content of the atmosphere.

Showers and some storms will continue Saturday as the front itself moves through. Depending on the speed of the front and convection, some reintensification is possible in the far southeast Saturday afternoon before it exits. Temperatures will fall Saturday as cold advection kicks in behind the front.

Saturday night through Sunday night...

Colder air and clearing skies may allow patchy frost to form in protected areas Saturday night, but winds should keep frost from most areas. A secondary cold front will move through on Sunday.
Wouldn't be surprised if a few light showers accompany it, but confidence isn't high enough to include at this time.

Lows Sunday night could get to near or below freezing in the far northeast forecast area. Elsewhere will see mid and upper 30s. Frost will also be a concern as winds diminish.

Monday and beyond...

Below normal temperatures will continue Monday, but above normal readings quickly return for Tuesday into Friday, with near 80 degrees possible by Thursday. A front could bring low rain chances at times Wednesday through Friday, but confidence is low at this time.

.AVIATION (06Z TAF Issuance)...
Issued at 101 AM EDT Fri Apr 17 2026

Impacts:

- Wind gusts around 20kt this afternoon and evening - Convection possible, mainly after 00Z Saturday

Discussion:

Patchy fog looks to remain north of the TAF sites near sunrise. Some VFR cumulus will pop up this afternoon, and isolated convection is possible after 21Z. Better chances for convection arrive late in the period, especially at KLAF. For the 30 hour KIND TAF, convection is likely after 06Z. MVFR and worse conditions are possible in convection.



IND WATCHES/WARNINGS/ADVISORIES
None.