847
FXUS63 KIND 090817
AFDIND

Area Forecast Discussion
National Weather Service Indianapolis IN
417 AM EDT Thu Oct 9 2025

.KEY MESSAGES...

- Sunny and Pleasant today with highs in the mid to upper 60s.

- Dry weather is expected much of the time through next week, with
  the possible exception of a few showers Friday night

- Temperatures will be near to slightly above normal much of the time

&&

.SHORT TERM (Today and tonight)...
Issued at 307 AM EDT Thu Oct 9 2025

Surface analysis early this morning shows strong high pressure
centered over the Great Lakes and Ontario. The high was extending
its influence across Indiana to KY and TN, as well as across the
Mississippi Valley. GOES19 shows clear skies across Indiana and much
of the region. Of note, some Lake clouds had formed with the ongoing
cold air advection off of the Great Lakes. Looking aloft, Water
vapor showed subsidence and drying across Indiana/IL and IA,
including much of the plains states. this was due to a strong upper
ridge axis found over MN, extending into western Ontario. Dew points
were in the upper 30s and lower 40s with light NE winds.

Today...

Models suggests the strong ridge axis in place over MN will drift
east across the Great Lakes and Indiana today, continuing to provide
subsidence as the associated surface high also drift eastward.
Forecast soundings show a dry column as these features pass with
unreachable convective temperatures and an inversion aloft. Thus no
CU will be expected and with protection from the ridge aloft, a
sunny sky is expected. Cold air advection remains ongoing today,
thus highs near persistence are expected.

Tonight...

Models show the ridging aloft exiting...allowing a northwest flow to
remain ahead of another, stronger ridge over the Rockies, An upper
level low is expected to push across Ontario and the northern Great
Lakes with this feature, but those dynamics appear to remain well
north of Indiana and will not impact our area. Meanwhile at the
surface, the strong high pressure system is expected to push to the
northeastern states, but a trailing ridge axis from the high will
stretch west across Indiana, controlling our weather, while
providing anti-cyclonic flow and subsidence. Again forecast
soundings show a dry column. Thus a clear and cool night will be
expected. Look for lows slightly warmer than persistence as warm air
advection begins aloft.

&&

.LONG TERM (Friday through Wednesday)...
Issued at 307 AM EDT Thu Oct 9 2025

Dry conditions will continue to dominate the area during the long
term period, with the possible exception of Friday night.

A compact upper low will drop into the Great Lakes Friday night,
stalling briefly before ejecting southeastward late Sunday. A
moisture starved cold front will push through the area Friday night
into Saturday, and a slight chance of showers will be possible
primarily north on Friday night, though for the most part, an
increase in cloud cover is the main expectation.

Temperatures will fluctuate somewhat throughout the period, being
near to slightly below normal early in the period, then a bit above
normal early next week before moderating slightly again mid week.
Lows will generally remain near to a bit below normal owing to
enhanced diurnal ranges to be expected in ongoing drought conditions.

&&

.AVIATION (12Z TAF Issuance)...
Issued at 417 AM EDT Thu Oct 9 2025

Impacts:

- None

Discussion:

High pressure will dominate the area during the period, leading to
clear skies, unrestricted visibility, and winds less than 10KT.
Winds will generally be easterly throughout the period.

&&

.IND WATCHES/WARNINGS/ADVISORIES...

Frost Advisory until 9 AM EDT this morning for INZ021-028>031-
035>042.

&&

$$

SHORT TERM...Puma
LONG TERM...Nield
AVIATION...Nield