Peotone Weather

National Weather Service Forecast for: 2 Miles SE Peotone, IL Issued by: National Weather Service Chicago/Romeoville, IL

Updated: Tue, 30-Dec-2025 1:31am CST

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Peotone, IL

Tuesday Mostly Cloudy then Slight Chance Light Snow Wednesday Cloudy then Chance Light Snow New Year's Day Mostly Sunny Friday Mostly Sunny Saturday Mostly Sunny Sunday Mostly Sunny Monday Partly Sunny   Hi 24 °F Hi 32 °F Hi 21 °F Hi 28 °F Hi 28 °F Hi 34 °F Hi 35 °F   Overnight Partly Cloudy Tuesday Night Slight Chance Light Snow then Cloudy Wednesday Night Chance Light Snow then Partly Cloudy Thursday Night Partly Cloudy Friday Night Partly Cloudy Saturday Night Mostly Cloudy Sunday Night Partly Cloudy   Lo 11 °F Lo 24 °F Lo 9 °F Lo 14 °F Lo 16 °F Lo 19 °F Lo 24 °F

Forecast from NOAA-NWS for 2 Miles SE Peotone, IL.

948
FXUS63 KLOT 300844
AFDLOT

Area Forecast Discussion
National Weather Service Chicago/Romeoville, IL
244 AM CST Tue Dec 30 2025

.KEY MESSAGES...

- Light snow likely late this afternoon/early this evening,
  mainly northeast of a Rockford to Rensselaer line.

- A period of snow again Wednesday afternoon.

&&

.DISCUSSION...
Issued at 244 AM CST Tue Dec 30 2025

Northwest flow aloft in the wake of the big weekend storm system
should remain in place the rest of the week. A series of low
amplitude shortwave troughs are likely to ripple through the
northwest flow at fairly regular intervals.

The first wave, has crossed the Canadian border into the
northern Plains early this morning and will rapidly move
southeast toward reaching the mid-Mississippi Valley later this
afternoon. Air mass in advance of this system is dry, but top-
down saturation is likely to result in snow developing
southeastward mid-late afternoon along the I-90 corridor. Not
only is moisture limited, but time/height X-sections depict a
short window (2-4 hours) with deep ascent and column saturated
enough for precip to reach the ground. Within a few hours of
snow reaching the ground, ascent is progged to weaken and mid
levels will begin to dry out. This should result in snow ending
or transitioning to a light snizzle by mid-late evening.

Overall, looks like a low QPF event with fairly modest
snow:liquid ratios given the expected mostly smaller flake size.
Accumulations looks to be generally an inch or less, but with
temps well below freezing and snow likely hitting during or
toward the end of the evening commute, there could still be
travel impacts.

Temperatures will remain cold today, likely struggling to reach 20
degrees during the daytime near the Wisconsin border and only
climbing into the lower 20 south of I-80 today. Temps tonight
will likely slowly rise reaching the mid to upper 20s by
daybreak Wednesday.

Clipper number 2 will be right on the heels of today`s system.
Snow looks to start earlier in the day tomorrow than today and
could fall with a bit more gusto than today`s snow. Stronger and
deeper ascent, aided by fairly strong divergence in the left
exit region of a 130kt+ 250mb jet streak could provide for a
period of some slightly beefier snowfall during the afternoon.
Still, with moisture still pretty limited and only a 3-5 hour
window of accumulating snow expected, it looks like the hardest
hit areas could end up with an inch or two of snow by the time
the snow ends Wed evening. It looks fairly windy during the snow
Wednesday, but not as windy nor as cold as it was during Sunday
night`s snow.

Quick shot of seasonably cold air is expected Wednesday night
into Thursday. As winds veer to more northerly direction and
prior to column really drying out, there could be a short window
of some lake effect snow into northeast Porter County Wed
evening, which could bump totals there up a bit.

There are indications that we could temporarily transition to
more of a zonal flow pattern over the weekend. This would allow
for some moderation in temps and with dry conditions.

- Izzi

&&

.AVIATION /06Z TAFS THROUGH 12Z WEDNESDAY/...
Issued at 1107 PM CST Mon Dec 29 2025

Key Aviation Messages for the current TAF period:

- Period of IFR snow late afternoon/evening tomorrow

Mid-high level cloudiness will quickly increase Tuesday morning
in advance of the next fast moving weather system expected to
impact the area tomorrow. Confidence in a period of light snow
has increased enough to go with a period of prevailing IFR snow
very late afternoon into the early-mid evening. Snow is expected
to end by mid-late evening with MVFR CIGS likely to through the
remainder of the night.

- Izzi

&&

.LOT WATCHES/WARNINGS/ADVISORIES...
IL...None.
IN...None.
LM...Small Craft Advisory until 3 AM CST early this morning for the
     IL nearshore waters.

     Small Craft Advisory until 3 PM CST this afternoon for the IN
     nearshore waters.

&&

$$

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