431
FXUS63 KIND 201355
AFDIND

Area Forecast Discussion
National Weather Service Indianapolis IN
955 AM EDT Tue Oct 20 2026

.KEY MESSAGES...

- Dry yet pleasant fall weather will prevail through this weekend

- Light winds and partly/mostly clear skies will oversee near to
  slightly above normal temperatures

&&

.FORECAST UPDATE...
Issued at 954 AM EDT Tue Oct 20 2026

Expect quiet weather today as surface high pressure remains in
control across the region. Predominately easterly surface flow will
result in negligible thermal advection, keeping temperatures almost
identical to yesterday. Look for highs in the upper 60s to lower 70s
under mostly sunny skies. Latest satellite imagery does depicts some
high clouds pushing through central Indiana this morning from a
subtle impulse aloft. These clouds will continue moving eastward
with sunny skies expected later today.

&&

.DISCUSSION (Today through Monday)...
Issued at 312 AM EDT Tue Oct 20 2026

Lovely autumn weather will continue to be the rule through the seven
day forecast period, courtesy of broad, quasi-stationary ridging.
Surface high pressure that has occupied much of the eastern two-
thirds of North America..will be maintained from the MS Valley to
Atlantic coast...while corresponding upper ridging builds across
the continent, extending from central Mexico to eastern Canada by
the end of the week.

Meanwhile in central Indiana, the lack of waves from the retracted
jet will keep light to calm winds, which should display an overall
veering from NE to SE this week as the surface ridge axis slides
from the Great Lakes to the Appalachians.  The building upper
ridge`s proximity from just west, to over the local region, will
provide strong subsidence, maintaining an overall dry column.  The
only possibly impactful weather will be early morning fog, which
would be favored in/near valleys along rivers and creek beds.

For latter portions of the period, an increasingly active northern
jet stream will likely host a potent baroclinic system over central
Canada this weekend.  However, the only effects on the CWA through
next Monday would be a more pronounced breeze ahead of the system`s
dragging / quasi-stationary cold front. High confidence in no
precipitation through this weekend with the staunch surface ridge
adjusting its alignment over the Deep South, blocking any
organized return of Gulf moisture...and most likely directing any
moderate rainfall with the northern system`s front closer to
WI/MI. Potential for a transition to colder conditions by the
middle of next week.

&&

.AVIATION (12Z TAF Issuance)...
Issued at 654 AM EDT Tue Oct 20 2026

Impacts:

- Brief MVFR in fog possible through 13Z today

Discussion:

Periods of MVFR visibility in fog are possible at outlying terminals
through 13Z today and again pre-dawn Wednesday.

Otherwise VFR conditions will continue through Wednesday morning
near central Indiana terminals as strong and broad surface high
pressure remains parked over eastern North America.  Weak and rain-
free disturbance crossing from Illinois to the OH Valley will
provide briefly SCT/BKN decks of high cloud through midday
today...with SKC expected to return by 21Z.

Light/variable winds through 15Z will yield to east-northeast flow
this afternoon and evening, sustained under 7KT.


&&

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

$$

UPDATE...Melo
AVIATION...AGM
DISCUSSION...AGM