559
FXUS63 KIND 051853
AFDIND

Area Forecast Discussion
National Weather Service Indianapolis IN
253 PM EDT Mon Oct 5 2026

.KEY MESSAGES...

- Dry through Saturday with most days at near to above normal
  temperatures under the influence of high pressure

- Fire weather conditions will require monitoring as several
  afternoons will likely feature minimum RH values well down into
  the 30s if not lower at times

- Precipitation chances increase beginning Sunday

&&

.DISCUSSION (This evening through Monday)...
Issued at 253 PM EDT Mon Oct 5 2026

Strong surface high pressure remains in place across the region.
The high`s center is expected to pass to our north tonight, from
west to east. This will cause winds to become more easterly tonight
and eventually southeasterly on Tuesday. With an added southerly
component to the wind field, warm air advection looks to commence. A
gradual warming trend appears likely beginning tomorrow. High
temperatures may climb into the 80s by Wednesday.

A broad trough skirts to our north later Wednesday into Thursday
with an associated surface low over the Hudson Bay. Though displaced
well to our north, this low will drag a surface cold front through
the Ohio River Valley. Cold air advection takes hold on Thursday
with a cool-down anticipated. Highs dip back into the low 70s both
Thursday and Friday; lows once again into the 40s. Patchy fog is
possible during the overnights with efficient radiational cooling.

The pattern repeats with surface high pressure arriving and then
passing to our northeast on Friday. Winds regain a southeasterly
component allowing gradual warming to begin again. Highs climbing
into the upper 70s to near 80 are possible this weekend. Clear skies
aside from occasional cirrus are expected through Saturday.

Dry conditions combined with daytime relative humidity values near
30 percent may allow for increased fire weather potential through
Saturday. Surface wind speeds are likely to remain light, thus
mitigating the threat.

SUNDAY ONWARD

Warming will continue into Sunday depending on whether a disturbance
over the Gulf lifts north or northeastward. Guidance is beginning to
hone in on the idea of tropical development over the southwestern
Gulf and taking the resulting system northward in conjunction with a
cut off upper-level low over Texas. This is a highly uncertain
situation, since multiple factors are in play that have yet to
develop.

First, the tropical cyclone may not develop at all and simply remain
a tropical wave / moisture plume. Second, the upper-level low over
Texas fails to materialize or is too fast/slow. Any combination of
these may dramatically affect the outcome for Indiana.

We can boil it down into two scenarios, however. One where it rains
and one where it does not. Should moisture lift northward into
Indiana, whether associated with a weak or strong low, then
temperatures are likely to be suppressed and rainfall chances high.
Should the system fail to develop or miss entirely, then above-
average warmth continues into the new week. These systems are within
a larger-scale ridge, so avoiding any precipitation will lead to a
continued warming trend.

&&

.AVIATION (18Z TAF Issuance)...
Issued at 126 PM EDT Mon Oct 5 2026

Impacts:

- Patchy fog possible tonight at LAF, HUF, and BMG.

Discussion:

Surface high pressure will move eastward through the TAF period
causing winds to gradually become more easterly tonight and
eventually southeasterly on Tuesday. Clear skies will prevail.

Patchy fog is possible at the outlying sites and will be included in
the TAFs as BR for now. Visibility may be briefly lower depending on
wind speeds tonight, and the TAFs will be refined in later updates.


&&

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

$$

AVIATION...Eckhoff
DISCUSSION...Eckhoff