430
FXUS63 KIND 051415
AFDIND

Area Forecast Discussion
National Weather Service Indianapolis IN
1015 AM EDT Fri Jun 5 2026

.KEY MESSAGES...

- Pleasant again today amid increasing winds...gusts to 20-30 mph
  this afternoon

- Chances of showers/t-storms north late today/tonight...more
  widespread showers possible late Saturday-Saturday night

- Very warm and humid starting Sunday, periods of showers/t-storms

&&

.FORECAST UPDATE...
Issued at 1014 AM EDT Fri Jun 5 2026

The forecast remains quite similar for today with unstable air
mostly holding off to the west until late tonight. Still there is
some uncertainty on PoPs and temperatures over NW central Indiana as
debris from upstream convection creates additional cloud cover and
limits the overall CAP. For now, the expectation is for a majority
of the deep cloud cover to stay west, but the margin for error will
be small and could bleed over into the Lafayette region. If this
does occur, afternoon highs are likely to be in the upper 70s vs the
mid 80s as currently forecasted.

&&

.DISCUSSION (Today through Thursday)...
Issued at 335 AM EDT Fri Jun 5 2026

Transition from recent pleasant early-summer conditions to prolonged
more-humid, and at times unsettled mid-summer pattern...to occur
today and Saturday.  Increasing, quasi-stacked southwesterly flow
today to boost precipitable water aloft and surface
dewpoints...although better forcing sliding by to the northwest of
the region should only allow a few showers/stray rumble of thunder
along the Upper Wabash Valley through early evening.

Several opportunities for showers and generally non-severe t-storms
will follow tonight through Saturday night as small ripples of
forcing slide west to east amid an overall zonal pattern...with
cross product of these ingredients most likely north of I-70. Cannot
rule out a couple marginally strong/severe gusts late tonight north/
west of Crawfordsville...although best chances for any organized or
stronger convection will be Saturday night, especially along an axis
north of the I-74 corridor, when marginally strong/severe gusts and
perhaps isolated large hail are on the table.

Upper pattern to then rearrange into another H500 subtropical ridge,
this time with the quasi-stationary axis aligned from the Great
Lakes into eastern Canada...which will favor deep Gulf moisture into
Indiana through much of the remaining period.  High humidity can be
expected, will dewpoints trending from upper 60s by Sunday morning,
into at least the low 70s by Tuesday.  Scattered to at times
numerous showers and at least a few embedded t-storms can be
expected through at least Wednesday.  One low-confidence variable
will be short wave/ vort max spinning northeastward through the
western Midwest early next week which could enhance convection and
present a greater potential for strong/severe cells...and possibly
less-active conditions in its wake.

Potential for isolated flash flooding will trend upward through the
early week for any areas receiving multiple rounds of heavier rains.
Temperatures to range from lows near 70F to highs in the 80s under
often considerable cloudiness.  Potential for first-90s by the late
week should the upper ridge build over the central US and allow
ample sunshine back into Indiana.  Indianapolis` highest reading so
far this year was 88F on March 22.

&&

.AVIATION (12Z TAF Issuance)...
Issued at 712 AM EDT Fri Jun 5 2026

Impacts:

- SSW winds increasing this morning, gusts peaking at 20-27KT 17Z-23Z
- Brief MVFR in scattered convection possible near KLAF this evening
- Brief MVFR/worse in convection possible at all terminals after 06Z

Discussion:

VFR conditions will prevail across central Indiana through 18Z
today, with brief MVFR/worse possible in convective -SH/TSRA
near/west of KLAF after 18Z...and at all terminals after 06Z
Saturday.

Stacked ridge centered over southern Appalachians this morning will
slide to Carolina coast tonight...allowing weaker and marginally-
forced cold front to advance east into Upper Midwest.  Transition to
more humid summer-like pattern today will start with gradient ahead
of boundary promoting increasing SSW flow this morning, sustained at
10KT by 14Z at most TAF sites...with gusts possible at KLAF from the
start of the period, reaching 20KT by 14Z.  SSW winds will peak
during 17Z-23Z, sustained up to 13-18KT with gusts up to 20-27KT.

Resultant Gulf moisture fetch to yield greater diurnal cumulus this
afternoon under steadily increasing mid/high clouds.  Marginal
potential for scattered convection to reach KLAF by late day/early
evening...but main convective impacts should hold off until after
midnight tonight late tonight into Saturday.


&&

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

$$

UPDATE...Updike
AVIATION...AGM
DISCUSSION...AGM