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
- Areas of fog early this morning...especially in low-lying areas - Isolated/scattered showers and a few t-storms are possible late Friday night...and again Saturday afternoon, mainly east
- Milder/less humid Saturday night through Tuesday...highs mainly 75- 80F, lows mainly 55-60F.
DISCUSSION (Today through Thursday)
Issued at 309 AM EDT Fri Aug 21 2026
Areas of reduced visibility in fog and patchy dense fog will dissipate early this morning amid light and variable winds. Lingering stratus should transition to diurnal cumulus by midday. Seasonably strong surface high pressure sliding east into New England...will drag its weaker southwestern corner/axis across central Indiana. Meanwhile a mid-level weakness will round the southern side of a Canadian upper trough into the Midwest... with dewpoints overall trending higher to end the workweek. H850 temperatures around only 15 degrees Celsius will allow for near to slightly below normal high temperatures in the low to mid-80s, although this milder trend will still feel summery by late day given the increasing humidity.
Increasing upper troughing from Great Lakes to eastern North America this weekend through the long term will suppresses hot/humid subtropical ridge well to our south/west...with an overall noticeably drier pattern through at least next Tuesday....although lower chances of RWs are on the table for late tonight, and more so eastern counties Saturday afternoon...ahead of more September-like conditions early next week.
AVIATION (06Z TAF Issuance)
Issued at 120 AM EDT Fri Aug 22 2026
Impacts:
Chance of fog at outlying terminals late tonight into early Friday.
Discussion:
Mostly clear skies will occur across the area tonight. This will result in the potential for patchy fog to develop, mainly from 08 to 12Z. MVFR to IFR visibility will be possible BR/FG in the areas of fog that develop overnight, especially at the outlying terminals.
MVFR ceilings will also be possible early Friday morning. Expect more diurnal cumulus Friday morning with mid level clouds moving in by Friday evening. Winds will likely be light and variable from the southeast to west, Friday morning becoming more westerly to northwesterly Friday afternoon and evening.
IND WATCHES/WARNINGS/ADVISORIES
None.
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