Peotone Weather

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

Updated: Sun, 28-Dec-2025 12:11am CST

- Select Forecast - Peotone, IL Manteno, IL Beecher, IL Monee, IL Kankakee, IL Willmington, IL Braidwood, IL Manhattan, IL OakForest, IL Stelle, IL Ottawa, IL Amboy, IL Byron, IL Rockford, IL Quad Cities, IL Champaign/Urbana, IL Peoria, IL Bloomington, IL Springfield, IL Carbondale, IL Vienna, IL Culver, IN

Peotone, IL

Sunday Patchy Fog Monday Chance Snow then Mostly Cloudy Tuesday Mostly Sunny Wednesday Mostly Cloudy New Year's Day Mostly Sunny Friday Mostly Sunny Saturday Partly Sunny   Hi 58 °F Hi 23 °F Hi 26 °F Hi 32 °F Hi 23 °F Hi 26 °F Hi 34 °F   Overnight Areas Of Drizzle Sunday Night Snow Likely Monday Night Partly Cloudy Tuesday Night Mostly Cloudy Wednesday Night Chance Snow Thursday Night Mostly Clear Friday Night Mostly Cloudy   Lo 44 °F Lo 17 °F Lo 12 °F Lo 22 °F Lo 15 °F Lo 9 °F Lo 18 °F

Wind Advisory issued December 27 at 9:23PM CST until December 29 at 6:00PM CST
 

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

024
FXUS63 KLOT 280530
AFDLOT

Area Forecast Discussion
National Weather Service Chicago/Romeoville, IL
1130 PM CST Sat Dec 27 2025

.KEY MESSAGES...

- Showers and some thunderstorms likely areawide Sunday into
  early Sunday evening.

- Thunderstorms may pose a locally damaging wind threat Sunday
  afternoon/early evening, mainly south of I-80.

- Very strong winds will usher in drastically colder air Sunday
  night into Monday, with some snow showers possible.

- Chance (40-50%) for light accumulating snow Wednesday
  afternoon into Wednesday evening.

&&

.UPDATE...
Issued at 937 PM CST Sat Dec 27 2025

Main updates this evening were to expand fog mention, include
the potential for dense fog, and add in areas of drizzle. Dense
Fog Advisory issuance for parts of the area seems probable,
though observations and webcams don`t quite support issuance yet
(as of this writing). Expansion of drizzle prior to and during
overnight shower development should contribute to further
lowering of visibility as temps and dew points slowly tick up.

There`s continued concern for embedded thunderstorms on Sunday
as alluded to in previous discussions, and this potential could
extend all the way to the Wisconsin border depending on how much
MUCAPE is realized (sufficient MUCAPE may even support hail in
more robust cores). Will let the midnight shift assess
thunderstorm and heavy rain trends for any modifications to that
aspect of the gridded forecast. Low topped convection with the
powerful cold front may pose a localized damaging wind threat,
covered well by the level 1 of 5 (Marginal Risk) for the
southeast CWA.

Have some concern that the initial "pops" of strong westerly
winds behind the front late Sunday may start a bit prior to the
current 6 PM Wind Advisory start time, but did not make any
changes with the evening updates, including continued
mentioning of the potential for gusts up to 55 mph at times.
Finally, within the Wind Advisory text, included details on the
wind- whipped snow showers tomorrow night into Monday that may
further exacerbate driving difficulties caused by the strong
cross winds on north to south roads.

Castro

&&

.DISCUSSION...
Issued at 204 PM CST Sat Dec 27 2025

Through Monday:

Early this afternoon, the early stages of lee cyclogenesis are
underway over the central Plains as a series of shortwave
impulses ejects east off the Colorado and New Mexico Rockies.
The lingering baroclinic zone found meandering about the Ohio
and lower Missouri river valleys this morning will serve as the
storm`s warm front. The boundary has begun to gradually scoot
northward as it tags up with the deepening cyclone. It`s
expected to move into our southern CWA early this evening and
continue lifting northward through the night as the low works
into the Midwest. As it does, we should see the area warm by
several degrees, especially in our south, during the late
evening and overnight. Temperatures are progged in the 40s area-
wide at dusk, and up into the mid 40s near the WI state line to
the lower and middle 50s south of I-80 by dawn on Sunday.

Mid level moisture will be lacking ahead of the front, but
there may be enough in the low levels to produce instances of
drizzle this evening amid some noteworthy moist isentropic
ascent ahead of the boundary. An uptick in layer moisture and
forcing look to generate some isolated to widely scattered
showers during the overnight. At least some visibility
reductions are also likely tonight into early tomorrow. The
lowest visibilities are favored immediately along and north of
the surface front, which should roughly equate the areas near
and north of I-80. Any light rain and especially drizzle that
materializes during the night will only increase the dense fog
potential. A targeted Dense Fog Advisory may be in the cards
later tonight as confidence grows.

The low will really begin to intensify during the morning once
the mid level low drops south into the northern Plains and
upper Midwest from Saskatchewan. Every piece of deterministic
guidance has this storm bombing, or getting awfully close to it,
between Sunday and Monday mornings. An impending secondary low
will also inject a plume of rich mid level moisture into the
area early Sunday. Accordingly, expectations are for precip
coverage to expand on either side of the warm front during the
morning, especially the latter part of the morning as the
double-barreled low crosses the Mississippi.

There is increasing concern for a period of training convective
showers along the warm front in the morning. As the low level
jet ramps up south of the warm front, latest RAP guidance
depicts strong low level shearing deformation and frontogenesis
along the boundary. Additionally, deep shear vectors will be
oriented roughly parallel to the boundary and we`ll be seeing
PWATs in excess of 1". This should result in steady moderate to
heavy rain along the boundary. Models have really ramped up this
signal over the past few runs. Some camps are depicting a
marginal amount of low level CAPE lifting north into the area
during the morning as the low levels warm around the front. A
lack of cooler air aloft should place a mid level lid on
parcels, but a few convective cores may grow just deep enough to
produce lightning, especially amid the deep, strong dynamic
forcing. Moreso than lightning though, the bigger concern is for
these mechanisms to stir up bands of heavy rainfall. A small
majority of deterministic camps paint localized areas of 0.5+"
6-hr totals beneath the warm front in our CWA during the
morning, and a couple to a few tenths are possible on a more
widespread basis. A big question is not only where exactly this
front will align, but whether the effective front will be more
stationary and target one corridor or if it`ll be more
transient and distribute the rain over a broader area. If the
former, flooding does not look like a big concern but localized
ponding and flooding of low spots is certainly plausible. WPC
has maintained a marginal risk for excessive rain in our CWA in
part for this warm frontal setup.

The better storm chances, including the severe potential, will
be during the afternoon and early evening along the
strengthening warm conveyor and effective cold front. Guidance
continues to resolve instability that generally wouldn`t raise
many concerns in the warm season, but given the dynamic forcing
associated with this wave and the impressive shear profiles,
marginal instability is likely all we`ll need to stir up
convection. Over the past couple of days now, there`s been a
slight northwestward shift in the heavy rain and thunder
environment for the afternoon and evening. The RAP has
consistently been farther northwest since the storm started
coming into its view yesterday. It even resolves a couple of
hundred Joules of elevated CAPE making it up to our northwestern
CWA. If that materializes, convective showers will be possible
area-wide. However, the more supportive thunder environment,
including the severe threat, still look to favor areas south of
I-80, and even moreso the farther south you go. A strong low
level jet atop the conveyor will provide substantial low level
and deep shear, and vectors will be oriented roughly normal to
the baroclinic zone. This setup will favor an eastward-moving
line of convection across central and southern portions of the
Midwest. With little to no instability available above the
lowest couple of hundred millibars, it`s very possible that we
see little lightning out this line. But the strong flow residing
just off the deck provide an opportunity for strong to locally
damaging winds at the surface. And the veering nature of the
strong low level shear does raise some concern for a non-zero
QLCS tornado threat if the near-surface environment can
destabilize along the leading edge. Again, the severe threat is
primarily for areas south of I-80 and seemingly greater with
south and southeastward extent where the better instability and
kinematics will focus. The line looks to be off to our east by
mid-evening.

Profiles will cool rapidly in the wake of the front Sunday
evening and night, even quicker than previously advertised. This
will bring a quick transition from rain to snow west to east
during the evening. Most will likely see only gusty flurries or
lighter snow showers during much of the night, but better
chances for bonafide snow showers will be found up in our north
where better attendant moisture and forcing will be found.
Chances for snow showers will expand southward around much of
the area for Monday morning as the low swings across the lake.
Greatest chances for accumulations will be north of I-80, but a
dusting will be possible area-wide. More meaningful
accumulations closer to or in excess of an inch may be on tap
for northern locales.

Final thing of note with this system will be the gusty winds
Sunday evening through Monday. Winds look even stronger during
this period than previously thought now that the high-res camps
have come into play. While showers may drag some stronger winds
down to the surface earlier in the day, gusts will really open
up during the evening in the cold advection wing. Confidence is
high in widespread 45 to 50 mph westerly gusts during the back
half of the evening through Monday morning. Occasional gusts to
55 mph will also be possible. Accordingly, decided to hoist an
area-wide Wind Advisory on this shift from Sunday evening
through the end of Monday afternoon. Gusts should ease during
the evening as the system lifts northeast of the Great Lakes.

Doom


Monday Night through Saturday:

Primary forecast concern for the extended is the chance for
light accumulating snow Wednesday afternoon/evening. This has
been a fairly consistent feature in the models for several days
now. A weak clipper system is expected to move across the
region Wednesday night with another push of colder air behind
it. A narrow band of light snow will be possible somewhere
nearby or across the local area, though there remains
considerable spread in the ensembles. Blended guidance has
increased pops, now in the mid/high chance range. Timing also
looks to be a bit faster. If snow does develop, trends would now
support mid/late Wednesday afternoon, then ending overnight,
before daybreak Thursday morning.

Temps perhaps in the upper single digits/lower teens Tuesday
morning with northwest winds still in the 10-15 mph range, could
produce subzero wind chills Thursday morning. Blended guidance
then warmed temps almost every period into the weekend, from
this early morning`s forecast. Some brief moderation in temps
may be possible Wednesday ahead of the clipper, but there
appears to be decent ensemble support for a rather cold New
Year`s Day with high pressure then moving across the area
Thursday night. Should there be a new coating of snow, that may
allow low temps Thursday night to be colder than guidance is
suggesting. But from this distance, made no changes to the
blended guidance.

Temps begin to slowly warm Friday into Saturday with high temps
next Saturday possibly back into the lower/mid 30s ahead of the
next potential weather system that may bring mixed wintry precip
somewhere nearby or to the local area. cms

&&

.AVIATION /06Z TAFS THROUGH 12Z MONDAY/...
Issued at 1130 PM CST Sat Dec 27 2025

Aviation forecast concerns:

- Extensive LIFR conditions overnight into Sunday morning, with
  areas of VLIFR possible. Highest confidence in cigs, vis may
  fluctuate with precip.

- SHRA expected Sunday with embedded TS likely. Localized gusty
  winds possible within SHRA/TS.

- Sharp cold front early Sunday evening with strong westerly winds
  with gusts around 40 kt. Falling temps likely supports a
  period of snow/snow showers overnight.

Strengthening surface low over central KS late this evening will
track northeast across northern IL Sunday. Low-level south-southeast
flow is bringing low-level moisture into the region with a northward-
moving warm front, helping to steadily lower cigs into LIFR since
late this afternoon. Development of drizzle also leading to lowering
vis, generally ranging from 3/4SM to 1 1/2SM currently with some
up/down fluctuation noted. Expectation is things will continue
to settle lower, with a areas of VLIFR possible overnight into
Sunday morning. With increasing shower coverage predawn however,
confidence in solid persistent VLIFR is somewhat low, though
certainly can`t be ruled out.

Surface low center is progged to track across the terminals midday
into mid-afternoon, with the surface warm front lifting into the
Chicago metro area. Unseasonably mild/moist low levels combined with
steepening lapse rates aloft will likely support some embedded TS,
and have included PROB30 mention for TSRA at all four Chicago metro
TAF sites (trend has been slightly farther north than earlier
guidance runs). Any convective SHRA/TSRA may be able to produce
brief locally gusty winds, most likely from the southwest (though
wind field will otherwise be fairly light and somewhat variable in
the vicinity of the surface low center track). SHRA will likely help
mix cigs a bit higher during the day, though low-end IFR likely to
prevail.

As the low pulls away late in the afternoon, winds will shift
sharply to the west-northwest, while becoming strong and gusty with
gusts ramping up into the 35-40+ kt range during the evening.
Advection of much colder air will also support a period of snow/snow
showers from mid-evening into the overnight hours, with IFR vsbys
possible and some accumulations possible.

Ratzer

&&

.MARINE...
Issued at 1130 PM CST Sat Dec 27 2025

- Gale Warning in effect from 6 PM Sunday to 10 PM Monday from
  Winthrop Harbor IL to Gary IN.

- Storm Watch remains in effect from Gary IN to Michigan City
  IN, from 6 PM Sunday to 3 PM Monday.

Areas of dense fog are expected into Sunday morning across the
nearshore, with a Marine Dense Fog Advisory in effect until 10
AM Sunday.

A powerful cold front will sweep across the lake late Sunday,
resulting in a rapid increase to gale force west-southwest
winds. There`s some concern that these winds could start a bit
earlier than the current 6 PM start time of the gale warning and
storm watch. As low pressure continues to rapidly deepen near
Lake Huron Sunday night into early Monday, westerly winds will
further increase. Confidence in occurrence and duration of storm
force speeds/gusts is highest for the southeast portion of the
lake and hence held onto a Storm Watch there (Gary to MI City)
in coordination with WFO Northern Indiana.

Freezing spray will also be possible early Monday morning and
continue into Monday night as air temperatures are expected to
be in the lower 20s and possibly into the teens.

Castro/CMS

&&

.LOT WATCHES/WARNINGS/ADVISORIES...
IL...Wind Advisory from 6 PM Sunday to 6 PM CST Monday for ILZ003-
     ILZ004-ILZ005-ILZ006-ILZ008-ILZ010-ILZ011-ILZ012-ILZ013-
     ILZ019-ILZ020-ILZ021-ILZ023-ILZ032-ILZ033-ILZ039-ILZ103-
     ILZ104-ILZ105-ILZ106-ILZ107-ILZ108.

IN...Wind Advisory from 6 PM CST /7 PM EST/ Sunday to 6 PM CST /7
    PM EST/ Monday for INZ001-INZ002-INZ010-INZ011-INZ019.

LM...Dense Fog Advisory until 10 AM CST Sunday for the IL and IN
     nearshore waters.

     Gale Warning from 6 PM Sunday to 10 PM CST Monday for Winthrop
     Harbor IL to Gary IN.

     Storm Watch from Sunday evening through Monday afternoon for
     Gary to Burns Harbor IN-Burns Harbor to Michigan City IN.

&&

$$

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