Peotone Weather
National Weather Service Forecast for: Peotone, IL
Issued by: National Weather Service Chicago/Romeoville, IL
Updated: Sun, 05-Dec-2021 2:37pm CST

Peotone, IL
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Partly Sunny
Partly Sunny

Mostly Cloudy
Mostly Cloudy

Partly Sunny
Partly Sunny


Chance rain
Chance rain

Chance Snow/Rain
Chance Snow/Rain

Partly Cloudy
Partly Cloudy
  Hi <35°F Hi ≈25°F Hi ≈35°F Hi ≈40°F Hi ≈45°F Hi <45°F Hi ≈40°F

Thunder storm
Thunder storm
Partly Cloudy
Partly Cloudy
Partly Cloudy
Partly Cloudy
Mostly Cloudy
Mostly Cloudy
Chance Snow/Rain
Chance Snow/Rain
Partly Cloudy
Partly Cloudy
Lo >25°F Lo ≈13°F Lo ≈19°F Lo ≈25°F Lo <35°F Lo ≈35°F Lo ≈25°F  

Wind Advisory

Cloudy with light rain, areas of drizzle and a slight chance of thunderstorms late in the afternoon, then cloudy with chance of light rain and areas of drizzle in the evening. Partly cloudy after midnight. Blustery. Lows in the upper 20s. Southwest winds 10 to 20 mph in the evening becoming west 15 to 25 mph with gusts up to 40 mph after midnight. Chance of measurable precipitation 90 percent.
Partly sunny in the morning then clearing. A chance of flurries in the morning. Blustery. Highs in the lower 30s. West winds 15 to 25 mph. Gusts up to 50 mph in the morning decreasing to 40 mph in the afternoon.
Monday Night
Clear in the evening then becoming partly cloudy. Lows 11 to 15. Northwest winds 10 to 20 mph. Gusts up to 30 mph in the evening.
Mostly cloudy. Highs in the mid 20s. West winds 5 to 10 mph.
Tuesday Night
Mostly cloudy with a 20 percent chance of light snow. Lows 17 to 21. South winds around 5 mph.
Partly sunny. Highs in the mid 30s.
Wednesday Night
Partly cloudy. Lows in the mid 20s.
Mostly cloudy with a 40 percent chance of light snow and light rain. Highs around 40.
Thursday Night
Mostly cloudy. Lows in the lower 30s.
Cloudy. Chance of rain in the afternoon. Highs in the mid 40s. Chance of precipitation 40 percent.
Friday Night
Cloudy. Rain likely in the evening, then a chance of rain and snow after midnight. Lows in the mid 30s. Chance of precipitation 60 percent.
Mostly cloudy with a 50 percent chance of rain and snow. Highs in the lower 40s.
Saturday Night
Partly cloudy. Lows in the mid 20s.
Partly cloudy. Highs around 40.


Forecast from NOAA-NWS for Peotone, IL. (Zone forecast for Eastern Will)

FXUS63 KLOT 052342

Area Forecast Discussion
National Weather Service Chicago/Romeoville, IL
542 PM CST Sun Dec 5 2021

Issued at 310 PM CST Sun Dec 5 2021

Through Monday night...

The main concern in the short term is strong winds late tonight
into Monday morning, in which a Wind Advisory has been issued for
locations along and north of the I-80 corridor.

Scattered light rain and drizzle/mist continues to fall this
afternoon within continued warm, moist advection aloft north of
an approaching warm front. These light showers will continue
through early evening before pushing slowly off to the east ahead
of a 1002 mb low pressure lifting northeast over the area. MUCAPE
values of around 100 J/kg as analyzed by the RAP may still result
in a couple thunderstorms in/near the eastern CWA before the
showers depart, and earlier there was some lightning in central

Meanwhile, temperatures will continue to warm through about 8 PM
as a warm frontal boundary inches into the southern CWA this
evening. Seeing that much of the area will remain north of the
boundary, we will see a sharp north-south temperature gradient
this evening with the far southern CWA warming into the lower to
possibly even mid 50s while areas north of I-88 will be stuck in
the upper 30s. As the storm`s low pressure center passes to our
northeast, a strong cold front will pass through the area sending
temperatures downwards.

Behind this cold front, westerly winds will markedly uptick
overnight within the cold advection regime and robust pressure
gradient between the deepening low and an incoming Canadian high
pressure around 1035 mb. The steepened low-level lapse rates and
unidirectional boundary layer flow look to support decent
momentum transfer to at least 2,000 ft where there is 45 to 50 mph
flow, despite the time of the day. It`s possible the overnight
hours keep gusts a little down from peak gust potential, but in
the morning hours the cold conveyor belt is potent enough that the
45 mph gusts should at least occasionally materialize. There is a
consistent signal of stratocumulus wrapping around in the morning
but this looks fairly thin and should not retard much of the
momentum transfer. With the cloud layer, albeit thin, overlapping
the -8C to -13C layer, some "low quality" flurries are likely to
pop up primarily in the northern CWA. These should not be a big
deal, but with the wind there could be some brief visibility
reductions. Winds will gradually ease late morning into the
afternoon from west to east.

The cold advection will not allow temperatures to recover on
Monday, with possibly a couple degree climb at best in the
afternoon. Wind chills will be in the teens much of the day. The
high pressure will spread over the area during Monday night with
winds dropping off. Before they do, some single digit wind chills
may unfold during the evening. Low temperatures Monday night have
the potential to drop down widespread into the single digits
(even a -1 from the 12Z MET guidance for Rochelle). One fly in
the ointment to that is the likelihood of incoming high to mid
clouds late Monday night/early Tuesday morning. We accounted for
those in the forecast, but if the clouds look less likely, the
lows will need to be inched downward.



Issued at 233 PM CST Sun Dec 5 2021

Tuesday through Sunday...

Guidance continues to fade away from any substantial precip
across the area Tuesday into Tuesday night as a trough embedded in
an expansive longwave trough across central and eastern North
America becomes rather sheared over the Great Lakes region. An
exceptionally dry antecedent airmass marked by sub-zero surface
dewpoints and pwats at or under 0.25" will inhibit widespread
precip potential even with modestly favorable mid and upper-level
dynamics in the region. Initially Tuesday morning, weak WAA and
fgen under the right entrance of an upper jet streak west of the
CWA may generate enough precip aloft for some flurries to reach
the surface into the northern CWA. A second area of light snow may
then develop later Tuesday into Tuesday evening ahead of a jet
streak approaching southern IL. Finally, light snow potential will
linger overnight into Wednesday as the embedded trough swings
through the area. Overall, most of the period will likely be dry,
with the setup favoring a period or two of higher probability
light snow with little to no QPF/accumulation.

Tuesday will be the coldest day so far this season with highs
struggling to rise into the mid 20s under decent cloud cover.
Winds should be fairly light in the morning, but wind chill values
near zero are likely across much of northern Illinois around

Another deep trough with an expansive low-level WAA and surface
trough response is progged to bring a bout of more unsettled
weather to the area Thursday into Thursday night. Thermal profiles
support mostly liquid precip given a notable warm nose advecting
in from the south, but some mixed precip potential exists at onset
with low- level wetbulb temps initially below freezing.

Another strong wave late Friday into Saturday will bring more
unsettled weather to the Great Lakes region. Given the variability
in guidance this far out, little detail can be provided. However,
the pattern favors some wintry precip during late week through
the weekend.



For the 00Z TAFs...

Aviation Forecast Concerns:

* IFR/LIFR ceilings and IFR vsbys this evening.

* Strong west winds developing later tonight, and persisting
  Monday. Strongest winds with gusts near 40 kt through Monday
  morning, easing gradually afternoon/evening.

Surface low pressure was over the upper Mississippi Valley early
this evening, with an occluded cold front stretching southeast to
a triple point with a warm front over northern IL. Light winds and
light rain/moist low level conditions across the forecast area
had resulted in LIFR cigs and IFR visibilities across the
terminals this afternoon, with ceilings 200-400 feet and
visibilities of 1 1/2-2SM common in drizzle/fog. These conditions
will persist for another couple of hours, though should begin to
improve as the surface frontal trough moves slowly east across the
terminals. Stronger west winds will lag the front a bit, but will
become strong and gusty late this evening/overnight. With the
stronger winds, an intrusion of drier low level air will allow for
rapid improvement to MVFR/VFR cigs and VFR visibilities. As the
main upper trough moves over the area Monday morning, a period of
high- MVFR cigs and a few snow flurries or light snow showers are
possible, though VFR conditions will return by afternoon.

As winds shift westerly later this evening, speeds will increase
with gusts 25-30 kt. Strongest winds look to arrive shortly after
midnight however, as strong low level cold advection maximizes
mixing and frequent gusts around 40 kts develop. This persists
through Monday morning, before a very gradual decrease occurs
during the afternoon/early evening. Direction should be pretty
consistent in the 280-300 degree range during this time.



Issued at 310 PM CST Sun Dec 5 2021

South to southwest winds to around 25 kt early this evening. A
lull in the winds is expected mid evening ahead of a trailing
strong cold front. This front will sweep across southern Lake
Michigan early overnight, shifting winds to the west/northwest
with speeds increasing to gales to 40 kt. These stronger winds
will continue through Monday morning and begin to slowly diminish
Monday afternoon into Monday evening. cms/MTF


IL...Wind Advisory...ILZ003-ILZ004-ILZ005-ILZ006-ILZ008-ILZ010-ILZ011-
     ILZ106-ILZ107-ILZ108...2 AM Monday to noon Monday.

IN...Wind Advisory...INZ001-INZ002...2 AM Monday to noon Monday.

LM...Gale Warning...LMZ740-LMZ741-LMZ742-LMZ743-LMZ744-
     LMZ745...midnight Monday to 3 PM Monday.

     Small Craft Advisory...nearshore waters until midnight Monday.



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NWS LOT Office Area Forecast Discussion