447 
FXUS63 KIND 281733
AFDIND

Area Forecast Discussion
National Weather Service Indianapolis IN
133 PM EDT Sun Sep 28 2025

.KEY MESSAGES...

- Patchy fog possible early this morning

- Dry and marginally hot through Monday, highs in the mid/upper 80s

- Continued dry and very warm into next weekend, temperatures 
  ranging from the 50s to around 80F

&&

.FORECAST UPDATE...
Issued at 948 AM EDT Sun Sep 28 2025

No changes made to the forecast with the morning update. We 
continue to expect another clear and calm day with above-normal 
temperatures. Highs today will top out in the mid to upper 80s.

&&

.SHORT TERM (Today and tonight)...
Issued at 300 AM EDT Sun Sep 28 2025

An axis of mid to upper-level ridging will arrive today, with weak 
troughing continuing to push eastward. This will aid in increasing 
pressure at the surface, with pressure increasing from 1015 to 
1028mb over the next 24 hours. This high pressure is expected to 
remain through the forecast period in some capacity. In terms of 
weather, ridging with building surface high pressure will create 
mostly clear skies, light winds, and above-average temperatures. In 
fact for today and tomorrow, 850mb temperatures will be creeping 
towards 15C, allowing for surface temperatures to push well into the 
upper 80s due to highly efficient PBL warming conditions. Overnight 
lows should continue to dip into the 50s with dew points remaining 
in the low to mid 50s. for the most part with ideal radiative 
cooling conditions. 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 low and confined to near rivers and in agricultural 
areas / farm fields.

&&

.LONG TERM (Monday through Saturday)...
Issued at 300 AM EDT Sun Sep 28 2025

The workweek will start with a near-carbon copy of the short term's 
impressive temperature swing from the upper 50s to unseasonably warm 
upper 80s over many central Indiana counties.  The dry and anomalous 
subtropical upper ridge leaning northeast while building farther 
north into south-central Canada...will hold H500 570+ dm heights 
into most of Indiana through at least Tuesday.  Combined with the 
dry column's ample sun and dewpoints in the 50s, this will 
facilitate widespread mid to upper 80s through Tuesday. 

A grandiose mass of autumnal surface high pressure over eastern 
Canada, will eventually plunge southward to the Mid-Atlantic, 
twisting with the highest upper heights expanding eastward into New 
England.  The surface ridge will also build westward back into the 
Midwest...with the arrival of this northern regime marked by breezes 
veering from NE to E, advecting lower dewpoints to near/below 
45F...around the Wednesday night timeframe.  Mostly clear skies will 
continue to prevail through the late week as the drying ground 
continues to promote large diurnal temperature ranges.  Readings 
will generally run from well above normal afternoons around 80F and 
near to slightly above normal early mornings in the 50s.

The upper ridge is expected to broaden over much of the US... likely 
blocking precipitation chances from the local region until the 
following week.

&&

.AVIATION (18Z TAF Issuance)...
Issued at 133 PM EDT Sun Sep 28 2025

Impacts:

- Brief MVFR/IFR conditions in fog possible at KHUF/KLAF/KBMG 
  tonight

Discussion:

VFR conditions are expected through the TAF period, with the 
exception of brief MVFR/IFR conditions at KHUF/KLAF/KBMG tonight 
with shallow fog once again developing.

Diurnal cumulus is expected both this afternoon and tomorrow 
afternoon. Winds will be light and variable to start before settling 
on a northeasterly direction tomorrow while remaining under 10kt.

&&

.IND WATCHES/WARNINGS/ADVISORIES...
None.
&&

$$

UPDATE...Eckhoff
SHORT TERM...Updike
LONG TERM...AGM
AVIATION...Eckhoff