textproduct: Indianapolis
This forecast discussion was created in the public domain by the National Weather Service. It can be found in its original form here.
KEY MESSAGES
- Dry through Saturday with seasonable temperatures
- Hotter and more humid air arrives Sunday and persists through much of next week
- Isolated thunderstorms may return mid to late week next week
DISCUSSION (This evening through Friday)
Issued at 211 PM EDT Fri Aug 28 2026
Rest of This Afternoon through Saturday...
Quiet weather will continue this period. High pressure will be at the surface. The few to scattered cumulus will dissipate early this evening. Upper energy will bring some high clouds tonight through Saturday.
There may be some patchy fog tonight depending on how thick the cirrus becomes. Guidance looks a bit warm for low temperatures again, so nudged them down a bit. Lows will be in the upper 50s to lower 60s. Highs on Saturday will generally be in the lower to middle 80s.
Saturday night through Sunday night...
An 850mb jet will aid in maintaining convection as it moves into the Great Lakes region Saturday night. This convection will ride around the upper high (the high will be to the southwest of central Indiana). While some models like the NAM try to bring some of this into parts of the area later Saturday night into Sunday, believe that the ridge will win prevail across central Indiana and keep the area dry. Will continue with a dry forecast.
Warmer air will start to move into the area as the ridge builds on Sunday, with highs in the upper 80s to lower 90s expected. Southwest surface winds will bring in more humid air as well.
Monday and beyond...
The upper ridge will keep convection at bay at least through Tuesday. It may weaken enough for isolated convection to pop up Wednesday through Friday afternoons, but confidence remains low.
The main story will be heat with highs in the 90s each day. Low temperatures mainly in the 70s won't provide much relief. Humid air will provide heat indices near 100 degrees for at least Tuesday into Thursday. These conditions will likely require a Heat Advisory due to the length of the heat.
AVIATION (18Z TAF Issuance)
Issued at 100 PM EDT Fri Aug 28 2026
Impacts:
- MVFR fog possible overnight.
Discussion:
Few to scattered cumulus this afternoon will diminish early this evening. Otherwise, high clouds will move across from time to time tonight into Saturday.
MVFR fog may form overnight at all but KIND, but confidence is low. High clouds may cut down on the potential.
IND WATCHES/WARNINGS/ADVISORIES
None.
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