Peotone Weather

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

Updated: Sat, 07-Dec-2024 4:57am 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

Saturday Mostly Sunny Sunday Mostly Sunny Monday Slight Chance Rain then Mostly Sunny Tuesday Partly Sunny Wednesday Partly Sunny then Slight Chance Snow Thursday Partly Sunny Friday Partly Sunny   Hi 44 °F Hi 49 °F Hi 50 °F Hi 34 °F Hi 26 °F Hi 26 °F Hi 39 °F   Overnight Mostly Clear Saturday Night Partly Cloudy Sunday Night Chance Rain Monday Night Mostly Cloudy Tuesday Night Mostly Cloudy Wednesday Night Partly Cloudy Thursday Night Partly Cloudy   Lo 21 °F Lo 34 °F Lo 40 °F Lo 28 °F Lo 20 °F Lo 12 °F Lo 18 °F

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

772
FXUS63 KLOT 070824
AFDLOT

Area Forecast Discussion
National Weather Service Chicago/Romeoville, IL
224 AM CST Sat Dec 7 2024

.KEY MESSAGES...

- Gusty winds today out of the southwest.

- Warmer-than-normal conditions this weekend with lower 50s
  likely for parts of the area on Sunday.

- Temperatures will be on a roller coaster next week with
  above-average temperatures Sunday and Monday, below average
  temperatures Wednesday and Thursday, and above-average
  temperatures by next weekend.

&&

.DISCUSSION...
Issued at 224 AM CST Sat Dec 7 2024

Through Sunday:

It`s certainly cool out there early this morning, but luckily
not quite as bitter as yesterday morning with temperatures
sitting in the lower and middle 20s. A large area of low level
warm advection driven by storm system passing north of the
region will overspread the Midwest during the day today. This
will help pull temperatures back into the lower and middle 40s
this afternoon. This will be the first day Chicago sees 40, and
a warmer-than-normal high, since the day before Thanksgiving.

The big story today weather-wise will be some gusty
southwesterly winds as a result of an impressive low level jet.
There is a notable amount of spread among wind guidance for
today, but that`s to be expected with a setup such as this one.
The warm advection will reinforce a strong, low-hanging
temperature inversion overhead which will considerably limit
boundary layer mixing during the day. Additionally, 925mb winds
are expected to build to over 40 kt by this afternoon, likely
increasing to 50+ kt during the evening. The very shallow mixing
into an awfully tight low level vertical wind profile makes for
a rather fragile wind forecast. We should see gusts start to
build during the morning and reach 25 to 30 mph by early
afternoon. The strongest gusts during the afternoon look to
occur across our northern CWA and up near the IL/WI state line
where the strongest low level winds will be right overhead. The
LLJ will spread southward later in the day carrying 25 to 30 mph
gusts well into the evening before the jet moves away and winds
begin to subside late in the evening.

Continued warm advection ahead of an approaching storm system
will keep temperatures relatively milder tonight and bring
warmer conditions to the area on Sunday. There is uncertainty in
afternoon temps on Sunday with discrepancies in the magnitude
of the warm advection. At least upper 40s is likely area-wide,
though much of the CWA will probably hit the 50 degree mark! No
rain or snow is anticipated today and through the day on Sunday,
although the aforementioned storm system will impact the area
as early as Sunday evening. More on that in the long term
discussion below.

Doom


Sunday Night through Friday:

Sunday night into early Monday, the cut-off low currently drifting
along the Arizona/Sonora/New Mexico borders is expected to become
reabsorbed into the northern stream flow and lift northeastward into
the Ohio River Valley as a compact short-wavelength-trough. However,
as a more pronounced upper-level long-wave trough with embedded
shortwaves dives into the southwestern United States around the same
time, height rises over the Great Lakes will effectively dampen the
leading shortwave. The net result should be a weakening
northeastward-moving shield of precipitation Sunday night into
Monday, with a majority of rain expected to fall from western
Kentucky to central Ohio along the nose of the shortwave
(chances for rain locally range from 10% near Rockford to around
60% in Rensselaer).

On Monday, aggregate upper-level troughing across the western US
will shift eastward anchored by a low pressure system lifting into
central Ontario. Around the same time, an associated cold front
should sweep eastward across the Great Lakes. While highs ahead
of the front on Monday should still reach the upper 40s to
lower 50s, temperatures will tumble Monday night with lows
expected to fall into the mid to upper 20s. Tuesday into
Wednesday, a sharp upper-level wave originating out of central
Nunavut is expected to race southward and merge with the upper-
level trough across the Great Lakes, effectively forcing the
trough to contract and rapidly lift toward the northeastern
United States. Such will set the stage for a lobe of arctic air
to swing through the Great Lakes. Highs in the 30s on Tuesday
will fall toward the 20s on Wednesday and Thursday (wind chills
some 10 to 15 degrees lower). Finally, would have to think
there should be a period or two of flurries or snow showers in
the general area as the contracting upper-level trough whips
overhead (perhaps on Wednesday).

Ensemble model guidance appears to be in agreement that the period
of cold temperatures next week will be short lived as somewhat zonal
flow becomes reestablished across the northern US. Indeed, multi-
model ensemble meteograms of temperatures support highs
returning to the 40s by next weekend. Interestingly, both EPS
and GEFS show a signal for wetter weather in the general region
in the December 14th to 17th timeframe as well, which aligns
well with the forecast for above-average precipitation by mid-
month advertised by the CPC.

Borchardt

&&

.AVIATION /06Z TAFS THROUGH 12Z SUNDAY/...
Issued at 1056 PM CST Fri Dec 6 2024

Forecast concerns include...

Strong/gusty southwest winds Saturday.
Possible mvfr cigs overnight.

An area of high mvfr/low vfr cigs near 3kft continues to move
southeast into far northern IL late this evening as it slowly
shrinks in size along with steady clearing across far northeast
IA. There also appears to be some holes developing. Mvfr cigs
are likely across northwest IL and at RFD and are possible at
the Chicago terminals, but confidence remains low for how long
mvfr cigs may persist. If the current clearing from the west
continues, most of this cloud cover should be scattering out by
daybreak across the Chicago terminals.

Southwest winds generally under 10kts overnight will increase
after sunrise with gusts into the mid 20kt range by late
morning. Higher gusts into the 30kt range are possible for a few
hours mid afternoon Saturday. Gusts will likely continue in the
20-25kt range Saturday evening with speeds/gusts slowly
diminishing early Sunday morning. Should winds diminish more
than currently expected Saturday evening, low level wind shear
will need to be monitored and possibly included in later
forecasts. cms

&&

.LOT WATCHES/WARNINGS/ADVISORIES...
IL...None.
IN...None.
LM...Small Craft Advisory from 10 AM this morning to 3 AM CST
     Sunday for the IL and IN nearshore waters.

&&

$$

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