244 FXUS63 KIND 271909 AFDINDArea Forecast Discussion National Weather Service Indianapolis IN 309 PM EDT Sat Sep 27 2025
.KEY MESSAGES...
- Patchy fog possible tonight across portions of central Indiana
- Dry and unseasonably warm through Monday, highs in the mid-80s
- Slight downward trend in temperatures Tuesday-Thursday to only slightly above normal
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.SHORT TERM (This evening through Sunday)... Issued at 309 PM EDT Sat Sep 27 2025
Mid to upper-level ridging is building in from the west as troughing over the Appalachians slides eastward. At the surface, high pressure dominates and will continue to do so through the duration of the forecast period.
In terms of weather, we can expect generally clear skies, light winds, and above-average temperatures. Highs in the mid to upper 80s are likely through the remainder of the weekend and into the coming week. Lows dip into the 50s for the most part with ideal radiative cooling conditions. Cooler temps in rural areas are anticipated with low to mid 50s. Lows in the upper 50s to near 60 are more likely in metro areas.
Patchy fog is possible during the overnight hours but duration and coverage will be lower than previous nights. As moisture from recent rainfall gradually dries up, fog should become more confined to near rivers and in agricultural areas / farm fields.
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.LONG TERM (Sunday night through Saturday)... Issued at 309 PM EDT Sat Sep 27 2025
The long term period will continue the streak of above normal temperatures and persistent dry weather. Synoptically, troughing will be set up across the west with low pressure from a tropical system tracks along the Florida coast. Over central Indiana, stalled high pressure will persist between the systems mentioned before. As the week goes on, the tropical system will exit to the east while ridging expands and stretches form the desert SW up to parts of New England, continuing central Indiana under high pressure. High pressure at the surface will only further the subsidence over the area. Thus, the warm and dry pattern persists. High temperatures will start off in the 80s and cool slightly by midweek to the upper 70s and low 80s with overnight lows in the 50s. At this time, there is no to very little chance of precipitation through the long term. Looking into the extended, ridging is expected to persist while CPC is also indicating continued warmer and drier than normal conditions.
While fire weather conditions are unlikely, especially following moderate to heavy rainfall earlier this week, daily minimum relative humidity values will drop to near 30 percent amid the unseasonable warmth Monday, and again Thursday-Friday, albeit never with higher gusts.
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.AVIATION (18Z TAF Issuance)... Issued at 136 PM EDT Sat Sep 27 2025
Impacts:
- Patchy fog possible at HUF and BMG, brief reduction to MVFR/IFR possible
Discussion:
VFR conditions expected throughout the TAF period with the exception of brief fog overnight at HUF and BMG. Fog may temporarily reduce conditions to MVFR or even IFR. Boundary layer air is a bit drier than yesterday so probability of fog is lower than previous nights.
Otherwise, expect light and variable winds with mainly clear skies.
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.IND WATCHES/WARNINGS/ADVISORIES... None. &&
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SHORT TERM...Eckhoff LONG TERM...KF AVIATION...Eckhoff
NWS IND Office Area Forecast Discussion