Monroeville, Indiana Weather Forecast Discussion

010
FXUS63 KIWX 261617
AFDIWX
Area Forecast Discussion
National Weather Service Northern Indiana
1217 PM EDT Fri Sep 26 2025
.KEY MESSAGES...
- Extended period of dry weather and sunshine continues into
  this weekend and much of next week.
- Highs generally in the low to mid 80s this weekend.
&&
.DISCUSSION...
Issued at 325 AM EDT Fri Sep 26 2025
A broad upper level trough extending from the Great Lakes down into
the Gulf states will linger around until Sunday as upper level
ridging works its way in from the southwest. The trough lifts off to
the east as a low moves through the Canadian Prairies and reaches
James Bay by Saturday night-Sun AM. At the surface high pressure
remains in place, and we`ll see continued dry conditions. The upper
level pattern takes on an omega-block look to it by the start of the
work week, with a 590dam ridge maximized over our CWA and low
pressure systems on either side (one on west coast, the other two
systems off over the Atlantic/eastern sea board). This ridge remains
all the way through next Saturday. 850mb temps linger in the 12-15C
range, so expect high temperatures to be in the 70s, low to mid 80s.
Lows overnight will start out in the 50s, low 60s and then drop into
the mid-upper 40s and 50s towards the latter half of the work week.
Beneath the surface high and eventually upper level ridge, winds
will remain light and skies partly to mostly clear. Overall-a
pleasant week ahead!
With favorable radiational cooling conditions overnight-clear skies,
light winds, and residual moisture around from this week`s
precipitation-we`ve watched patchy dense fog start to become more
widespread. Issued a dense fog advisory overnight for the whole CWA--
though some areas will see a bit more persistent dense fog than
others. A lot of the sites are bouncing around-going from 10SM to
1SM or less at times. In the last hour or so, we`ve seen sites
further west and central start to be more consistently down around
1/2SM-with several consistently at 1/4SM. Visibility has dropped
rapidly here at NWS IWX (North Webster, IN). I expect the dense fog
to become more widespread as we get closer to sunrise, then become
more patchy in nature through 9-11 am ET. Satellite trends are
aligning with obs (using the 10.3-3.9 um)-suggesting the fog is
thickening and expanding eastward. Travelers this morning may want
to leave a bit early to account for potential delays from low
visibility--be cautious when driving as conditions may change
rapidly. Reports of visibility are appreciated.
&&
.AVIATION /18Z TAFS THROUGH 18Z SATURDAY/...
Issued at 1217 PM EDT Fri Sep 26 2025
Ridging will be in control with light winds, mainly clear skies
and VFR conditions. A much lesser threat for fog/br development
toward daybreak Saturday at the terminals tomorrow given the
greater mixout of drier air today. However, temps will fall to
near crossover values which may allow for some patchy ground fog
to develop. Will hold off on including a br mention in the TAF
at this time given the very low point chances for VIS
restrictions.
&&
.IWX WATCHES/WARNINGS/ADVISORIES...
IN...None.
OH...None.
MI...None.
MARINE...None.
&&
$$
DISCUSSION...MCD
AVIATION...Steinwedel

NWS IWX Office Area Forecast Discussion