Anderson, Indiana 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

441
FXUS63 KLOT 011105
AFDLOT

Area Forecast Discussion
National Weather Service Chicago/Romeoville, IL
605 AM CDT Fri Aug 1 2025

.KEY MESSAGES...

- Wildfire smoke will remain in the area through the weekend.

- High swim risks at all Lake Michigan beaches through at least
  today.

&&

.DISCUSSION...
Issued at 300 AM CDT Fri Aug 1 2025

A subtle inverted surface trough, based on recent mesoanalysis,
is moving westward over Lake Michigan and into northeastern
Illinois. Increasing convergence along the shoreline and some
instability has allowed a ribbon of stratocumulus to develop (as
seen on satellite nighttime microphysics) from Kenosha, WI down
to O`Hare. The amount of moisture available remains marginal
but even with weak forcing and instability, it is possible that
some light sprinkles or a shower may to develop this morning
before daybreak. The slight chance for sprinkles and/or showers
will diminish by midday as drier air mixes in.

A broad upper level trough over eastern Canada remains visible
on GOES-19 water vapor imagery as upper level ridge sits over
the western part of the CONUS, with its ridge axis along the
Rocky Mountains. Recent mesoanalysis plots a surface high
sitting along the border of Wisconsin and Minnesota projected to
slink eastward and broaden across the western Great Lakes
through today and tonight. With a drier air mass in place, dew
points should remain in the 50s (maybe just touch 60) with high
temperatures today in the mid 70s. The only downside to this
pattern is the wildfire smoke that is wrapping around the
eastern side of the surface high. Visibilities have improved
compared to Thursday, but there are still plenty of observations
that are reporting between 4 to 7 miles of reduced
visibilities. Luckily, recent models are suggesting that the
thickest plume near the surface will continue to move west of
the city. However, considering that east-to-northeast winds are
expected to remain through the weekend and the amount of smoke
upstream observed on visible satellite last evening, it would
not be surprising if a murky look to the skies remained through
the weekend. Satellite trends will need to be monitored but for
now hazy skies have been kept in the forecast.

Other than the potential for lingering smoke, the high pressure
remaining over the region through the weekend should provide
dry and pleasant conditions. Temperatures will warm gradually
into the 80s with overnight lows in the 50s.

Unfortunately, the surface high begins to move east toward the
Atlantic early next week. As it does, southeast winds will
allow moisture from the Atlantic and the Gulf Coast to be pulled
into the area increasing dew points into the 60s. At the same
time, an upper level trough is projected to eject out of the
Rockies and over the Great Plains. Recent models have slowed
the progression of this trough, suggesting that it may not
approach the area until later on Tuesday. While the timing can
be refined closer to the date as models get a better handle on
it, this pattern certainly supports the return of isolated to
widely scattered showers and storms around mid week next week.
Minor ridging may provide a brief break toward the end of the
week, but then another wave may bring chances for rain at the
end of next week.

DK

&&

.AVIATION /12Z TAFS THROUGH 18Z SATURDAY/...
Issued at 605 AM CDT Fri Aug 1 2025

Smoke and haze is expected to linger around the region today.
TAFs start with MVFR vis due to enough observations around the
area with around 5 SM being reported. As winds increase late
this morning, there could be enough mixing to allow improvement
back to VFR. However, there is low confidence and satellite
trends will need to be monitored closely.

Winds are fairly light, but they will increase and be out of
the east this morning. They will slowly turn to the northeast
this afternoon with occasional gusts around 20 knots. Winds will
then slowly diminish and become light tonight. There is a
chance that winds drift toward the north, if not northwest,
tomorrow night, but considering how light they will be no
impacts are expected.

DK

&&

.LOT WATCHES/WARNINGS/ADVISORIES...
IL...Air Quality Alert until midnight CDT tonight for ILZ003-ILZ004-
     ILZ005-ILZ006-ILZ008-ILZ010-ILZ011-ILZ012-ILZ013-ILZ019-
     ILZ020-ILZ021-ILZ023-ILZ032-ILZ033-ILZ039-ILZ103-ILZ104-
     ILZ105-ILZ106-ILZ107-ILZ108.

     Beach Hazards Statement until 4 PM CDT this afternoon for
     ILZ006-ILZ103-ILZ104.

IN...Beach Hazards Statement until 4 PM CDT this afternoon for
     INZ001-INZ002.

LM...Small Craft Advisory until 9 AM CDT this morning for the IL
     and IN nearshore waters.

&&

$$

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