036
FXUS63 KIWX 301727
AFDIWX

Area Forecast Discussion
National Weather Service Northern Indiana
127 PM EDT Mon Jun 30 2025

.KEY MESSAGES...

- Two periods of showers/storms are expected, one into the
  morning hours and a second, lower confidence chance late
  afternoon into this evening. Heavy rain is the most likely
  threat, but stronger storms this afternoon and evening could
  produce isolated wind damage.

- Drier and less humid Tuesday through early Friday with
  seasonable highs in the 80s.

- A return to hot and humid conditions as well as diurnal
  showers/storms Saturday to Monday.

&&

.DISCUSSION...
Issued at 312 AM EDT Mon Jun 30 2025

A small area of showers and storms has been trying to expand across
SW portions of the CWA, but is struggling given the overall lack of
convergence or strong forcing. An area of showers and storms was
holding its own and even expanding somewhat across central IN
with this area working NE to impacts SE parts of the forecast
area through 15Z or so. Have went with chc pops in these area
and slgt chc elsewhere to handle the pop up activity expected. The
main threat from any of these will be locally heavy rain given
copious amounts of moisture (PWATs pushing 2" in some areas) and
overall slow movement. The area will likely end up in a lull
for convection prior to the arrival of a cold front and
somewhat stronger trough. However, the final coverage of the
first round of convection as well as any remnant outflows will
determine if we can indeed remain dry or if random
showers/storms pop in an unstable (MLCAPE 1000 to 1500 J/KG) and
most likely uncapped atmosphere. Any areas of weak convergence
could easily pop a few storms with the the most likely areas
late AM into early afternoon possibly being near Lk MI where
lake convergence may hug the shore and allow for some
development. CAMs are struggling on exactly how convection may
unfold with regards to timing, coverage and intensity along and
ahead of the cold front leading to low confidence in the final
outcome. Any limited severe threat will come from development
this afternoon and evening, but even so the best dynamics and
shear lag behind the front resulting in more of a pulse or
loosely organized multicell storm setup with locally heavy rain
and gusty winds the main concern. After coordination, have
capped pops at high chc during the most favorable window late
afternoon into early evening and opted for coverage wording
today and this evening everywhere. Based on some models trends
on a slower arrival to the cold front, pops were also slowed
down wrt to the west to east lowering trend. Everything should
generally be clear by 6Z Tue.

Tuesday through Fri night will be somewhat less humid and
seasonable warm with highs in the 80s as the overall upper level
trough remains in place. Model blend still placing some slgt
chc pops in for Thursday with a subtle disturbance. Not really
buying the slgt chc pops, but will leave alone for now. Upper
level ridging begins to build for the weekend with signals of
590 dm or higher working back in which would yield highs in the
upper 80s to around 90 and at least somewhat increased humidity
as well as diurnal chances for showers and storms.

&&

.AVIATION /12Z TAFS THROUGH 12Z TUESDAY/...
Issued at 611 AM EDT Mon Jun 30 2025

Cloudiness began to scatter out in the west during the mid morning
and that has allowed for some instability to form. Models are little
inconsistent on where storms will be during the afternoon and
evening hours, but still feel confident enough to keep a mention of
showers and storms at FWA this afternoon. We`ll then have to
watch the arrival of a cold front after 00z. Given how much
debris clouds have been across the area this morning and how
late it is at night, would expect that this should just stay
showers. Some MVFR flight conditions will be possible from
those showers as they move through. The cold front moves
through and brings a cooler and drier airmass overnight into
Tuesday, but at this point the BR/fog chance looks low. Winds
are still expected to stay at or less than 10 kts with west
southwest winds veering more northwesterly by the end of the
period.

 &&

.IWX WATCHES/WARNINGS/ADVISORIES...
IN...None.
OH...None.
MI...None.
MARINE...None.

&&

.IWX WATCHES/WARNINGS/ADVISORIES...
IN...None.
OH...None.
MI...None.
MARINE...None.

&&

$$

DISCUSSION...Fisher
AVIATION...Roller