547
FXUS63 KIND 100942
AFDIND

Area Forecast Discussion
National Weather Service Indianapolis IN
542 AM EDT Sat Oct 10 2026

.KEY MESSAGES...

-Dry conditions persist through the early evening with high
 temperatures in the mid to upper 70s

-Rain arrives this evening into Sunday as tropical remnants move
 into the Ohio Valley with a potential sharp cutoff in rainfall

-Another round of rain likely mid to late week as another low
 pressure moves through

&&

.DISCUSSION (Today through Friday)...
Issued at 135 AM EDT Sat Oct 10 2026

Today Through Sunday.

Surface high pressure migrating exiting the Mid-Atlantic coast will
maintain dry conditions and southeasterly flow across central
Indiana on through the day today with increasing cloud cover. These
clouds will keep temperatures cooler across the southeastern
counties with highs in the mid 70s while areas towards Lafayette may
get close to 80 as the thicker clouds don`t arrive until mid to late
afternoon.

Primary focus remains in the overnight through Sunday timeframe as
the remnants of Isaias move into the Ohio Valley. There remains
considerable spread among deterministic and ensemble guidance
regarding the western extent of the associated precipitation shield.
The latest GFS and GEFS solutions continue to favor an eastward
track, keeping the primary moisture axis and associated heavier rain
focused over Ohio and eastern Kentucky. In this scenario, rainfall
amounts will be fairly minimal with the potential that rain amounts
remain a tenth of an inch or less for much of the areas west of
I-69.

Conversely, the NAM and a few higher resolution models support a
slightly deeper phasing of the northern and southern streams,
pulling the remnant low and associated mid-level deformation zone
further west. This solution brings a broad shield of light to
moderate rain as far west as the Illinois border, yielding 0.25 to
0.75 inches of rainfall. High-resolution guidance from the HREF
highlights a remarkably sharp precipitation gradient on the
western periphery of the system. Strong easterly flow aloft will
encounter a persistent dry airmass over the mid-Mississippi Valley
which leans more towards the lower-end precipitation solution,
especially for the western and northwestern portions of the
forecast area.

Regarding timing, isentropic ascent and saturation will gradually
overcome the dry antecedent airmass after 21Z Saturday, with peak
precipitation rates occurring between 00Z and 06Z. Forcing will
quickly exit to the east by Sunday morning as the primary trough
axis pivots eastward with any precipitation remaining closer to the
Ohio border. High temperatures will range from the upper 70s in the
west where clouds will clear early to around 70 in the east where
clouds will stick around through the day.

Monday Through Friday.

Mid-level ridging and surface high pressure will build across the
region on Monday, initiating a period of stronger WAA and bringing
near record temperatures to Illinois and portions of western
Indiana. These much warmer than normal temperatures will continue
into Tuesday before the pattern begins to shift towards mid to late
week.

Medium-range guidance show a more significant pattern amplification
for the middle and end of next week. A deep longwave trough will
eject out of the Rockies on Wednesday, driving rapid cyclogenesis
over the Upper Midwest. Strong CVA and favorable upper-level jet
coupling will provide robust dynamic forcing across the Ohio Valley.
A sweeping cold front will cross central Indiana late Wednesday into
Wednesday night, accompanied by widespread precipitation.

Post-frontal CAA will bring temperatures back to near normal by
Friday with high pressure building across the Ohio Valley. Looking
towards the weekend, this cooler pattern along with a drier airmass
may bring the first potential for frost Saturday night into Sunday.

&&

.AVIATION (12Z TAF Issuance)...
Issued at 541 AM EDT Sat Oct 10 2026

Impacts:

-Easterly wind gusts to 20kt at IND and BMG after 00Z
-MVFR cigs and light rain after 00Z, mainly between 00Z and 06Z

Discussion:

VFR conditions expected through much of the day today before
remnants from Isaias bring wind gusts, light rain, and lowered cigs
after 00Z. Rain coverage will be greatest at IND and BMG along with
stronger winds with the potential for little to no impacts towards
HUF and LAF beyond brief light rain. The thunder potential is too
low for a mention in the TAF, but can`t rule out a brief rumble.
Rain rates are expected to remain light enough to not limit vsbys
outside of the strongest showers of the day. There are some signs
that cigs will drop to IFR towards 12Z Sunday, but currently expect
cloud bases to remain MVFR.

&&

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

$$

AVIATION...White
DISCUSSION...White