Ober, Indiana Weather Forecast Discussion

965
FXUS63 KIWX 260727
AFDIWX
Area Forecast Discussion
National Weather Service Northern Indiana
327 AM EDT Fri Sep 26 2025
.KEY MESSAGES...
- There is a dense fog advisory through this morning. Expect
  visibilities of around one mile or less. In areas of dense
  fog, visibility will be around one quarter to one half of a
  mile.
- Dry and partly to mostly sunny through next week. Highs will
  be in the 70s and low to mid 80s. Lows will be in the 50s and
  low 60s through Tuesday night, then the mid to upper 40s and
  50s towards the latter half of the work week.
&&
.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 /06Z TAFS THROUGH 06Z SATURDAY/...
Issued at 1257 AM EDT Fri Sep 26 2025
Minimal changes needed for the 06Z TAF issuance. Patchy dense
fog has developed across northwest Indiana over the past 1-2
hours and is expected to become more widespread towards
daybreak. Visibilities will be highly variable, as evidenced by
the fact that KSBN dropped to 2 miles visibility with fog within
the past hour and is now back up to 10 miles. With clear skies,
increased radiational cooling will allow for more fog to
develop, particularly between 09-13Z. IFR to potentially LIFR
visibilities as possible area-wide, including at the terminals,
although confidence is low as to where the lowest visibilities
will occur. Fog will dissipate 1-2 after sunrise. A dry day is
ahead with light southwesterly winds and VFR ceilings.
&&
.IWX WATCHES/WARNINGS/ADVISORIES...
IN...Dense Fog Advisory until 11 AM EDT /10 AM CDT/ this morning
     for INZ005>009-012>015-017-018-020-022>027-032>034-103-
     104-116-203-204-216.
OH...Dense Fog Advisory until 11 AM EDT this morning for OHZ001-002-
     004-005-015-016-024-025.
MI...Dense Fog Advisory until 11 AM EDT this morning for MIZ078>081-
     177-277.
MARINE...None.
&&
$$
DISCUSSION...MCD
AVIATION...Johnson

NWS IWX Office Area Forecast Discussion