Peotone Weather
National Weather Service Forecast for: Peotone, IL
Issued by: National Weather Service Chicago/Romeoville, IL
Updated: Fri, 27-Nov-2020 4:15pm CST

Peotone, IL
This Afternoon: Sunny

Saturday: Sunny

Sunday: Partly Sunny
Partly Sunny

Monday: Slight Chance Snow Showers then Partly Sunny
Slight Chance Snow Showers then Partly Sunny

Tuesday: Sunny

Wednesday: Mostly Sunny
Mostly Sunny

Thursday: Mostly Sunny
Mostly Sunny
Hi 42 °F ↓ Hi 50 °F ↓ Hi 47 °F Hi 35 °F Hi 35 °F Hi 40 °F Hi 40 °F  

Tonight: Clear
Saturday Night: Mostly Clear
Mostly Clear
Sunday Night: Slight Chance Rain And Snow
Slight Chance Rain And Snow
Monday Night: Mostly Cloudy
Mostly Cloudy
Tuesday Night: Mostly Clear
Mostly Clear
Wednesday Night: Mostly Cloudy
Mostly Cloudy
Thursday Night: Partly Cloudy
Partly Cloudy
Lo 26 °F Lo 32 °F Lo 28 °F Lo 21 °F Lo 22 °F Lo 23 °F Lo 25 °F  


This Afternoon
Sunny. High near 42, with temperatures falling to around 39 in the afternoon. West northwest wind around 10 mph.
Clear, with a low around 26. West wind around 5 mph.
Sunny. High near 50, with temperatures falling to around 43 in the afternoon. Southwest wind 5 to 15 mph, with gusts as high as 25 mph.
Saturday Night
Mostly clear, with a low around 32. Southwest wind 5 to 10 mph.
Partly sunny, with a high near 47. West southwest wind around 10 mph, with gusts as high as 20 mph.
Sunday Night
A slight chance of rain and snow after 9pm. Mostly cloudy, with a low around 28. Chance of precipitation is 20%. New snow accumulation of less than half an inch possible.
A slight chance of snow showers before noon. Partly sunny, with a high near 35. Chance of precipitation is 20%.
Monday Night
Mostly cloudy, with a low around 21.
Sunny, with a high near 35.
Tuesday Night
Mostly clear, with a low around 22.
Mostly sunny, with a high near 40.
Wednesday Night
Mostly cloudy, with a low around 23.
Mostly sunny, with a high near 40.
Thursday Night
Partly cloudy, with a low around 25.


Forecast from NOAA-NWS for Peotone, IL.

FXUS63 KLOT 280022

Area Forecast Discussion
National Weather Service Chicago/Romeoville, IL
622 PM CST Fri Nov 27 2020

1204 PM CST

Through Saturday night...

Quiet conditions are in store with no significant forecast concerns
for the first half of the weekend. This afternoon we`ll finally
be clearing out the pesky low clouds we`ve dealt with much of the
past few days. The rest of the short term will then be mostly
clear for a change. Influence of surface high pressure over the
central Plains will extend across the area tonight, followed by
the surface high passing to our south on Saturday. Winds becoming
light to calm tonight will support good radiational cooling
conditions for seasonable lows in the 20s outside of Chicago.
Can`t rule out some patchy ground fog I-80 and south where dew
points will stay a bit higher, though no official mention yet in
the grids, with confidence low and coverage likely to stay very
patchy if any fog develops.

Westerly warm advection on Saturday will keep mixing heights
pretty shallow, but with full sun and southwest winds gusting up
to 25 mph in the afternoon, temperatures will rebound from the
chilly start to the upper 40s to lower 50s, solidly above normal
for the date. If mixing is a bit deeper than forecast, some mid
50s readings will be possible. This will be followed by lows a few
to several degrees warmer than tonight on Saturday night, as
southwest winds probably stay up in the 5-10 mph range. There
could even be sporadic gusts as a fairly vigorous low level jet
develops overhead.



244 PM CST

Sunday through Friday...

No major changes in the forecast as we look ahead to a storm
system that will provide a glancing blow to portions of the area
early next week.

A deep upper-low over the AZ/NM line this afternoon will drift
east to southern OK by early Sunday before lifting along the Ohio
River Valley Sunday night. Meanwhile, a trough over far northwest
Canada today will dig southeast to the Upper Mississippi River
Valley by late Sunday. Resultant phasing of the two features will
yield a strengthening broad upper low encompassing the southern
Great Lakes and Ohio Valley regions by Monday night. After the low
slowly lifts northeast into Quebec by Wednesday, a mid-level
saddle point will cross the area through Wednesday night. While
slight run-to-run differences in both the temporal and spatial
evolution of both features are evident in guidance through
Tuesday, there have not been any significant changes among the
collective deterministic and ensemble model suite.

Quiet weather should continue into Sunday as cloud cover
increases in advance of the southern system. A cold front
extending southwest from a low traversing Lake Superior Saturday
night will cross the CWA during the afternoon hours, likely
leading to falling temps for at least the northwest half of the
CWA after earlier highs in the mid 40s. While deep moisture will
be lacking along the front as it crosses most of the CWA, some
guidance has trended toward an earlier arrival of a narrow band of
higher PWAT air ahead of the approaching southern low. An axis of
post-frontal snow, possibly mixing with rain at onset, may form
roughly along and southeast of I-55 by mid- evening Sunday through
the overnight hours. A light dusting of up to a few tenths of an
inch of snow is possible during this time.

Attention then turns to increasingly favorable LES parameters
into the Illinois shore and northwest Indiana later Sunday night
into Monday night. Marginal 850hPa-SST delta T values around 12C
(still sufficient for lake enhancement) will increase to around
15C by mid- morning Sunday. Meanwhile, lake-induced convective
PBLs will grow as deep as 8-10kft. Additionally, fetch will be
about an long as possible into northwest Indiana due to the slight
cyclonic curvature in the wind field mostly matching the shape of
Lake Michigan. Putting this together, a potentially impactful LES
event still appears likely into northwest Indiana near and east
of Gary. Higher probabilities of a dominate mid-lake band amid a
strong low-level wind field will likely allow for a decent amount
of inland propagation of the snow through portions of Newton and
most of Jasper counties. With that said, some concern remains that
slightly backed flow in the top of the convective layer combined
with enhanced shoreline convergence could initially focus the LES
band as far west as along the Illinois shore with the band edging
a few miles inland (including downtown Chicago). This remains a
lower probability scenario, but still something worth keeping an
eye on.

Finally, though thermal profiles are marginal for snow growth and
indicate near-surface temps possibly above freezing, substantial
lift in the convective layer aided by the upper trough should be
sufficient for producing >10:1 SLRs.

A prolonged strong northerly wind event remains likely late
Sunday night through Tuesday, with the strongest winds throughout
the day Monday. Gusts in excess of 35 mph across the east half of
the CWA, with gusts to 45 mph possible near Lake Michigan
(especially within and dominate LES band), are expected through
much of the day Monday. Given the prolonged north wind event, the
combination of large waves over at least 10 feet and surge will
increase concerns for a higher end lakeshore flood event for
northwest Indiana with notable impacts also for the Cook County
shore Monday into Tuesday.

LES should end by Tuesday night as winds slowly diminish.
Seasonable conditions with highs around 40 will then remain in
place to close out next week.



For the 00Z TAFs...

Concerns include:
* SW wind gusts up to 20-25 kt late AM through Saturday afternoon

High pressure will nose in from the southwest tonight, but not
move directly overhead. Skies will remain mostly clear outside of
some passing mid level clouds. We cannot rule out some patchy
ground fog south/west of the terminals late tonight. West-
northwest winds this afternoon will become light southwest
tonight and probably go calm at times outside Chicago. Southwest
winds will pick up on Saturday as large high pressure passes well
to our south. Expect gusts up to 20-25 kt from a 220-230 deg



.MARINE...300 PM CST...

A strengthening storm system is expected to track along the
western Appalachians into the lower Great Lakes Sunday night into
Tuesday while a surface ridge persists from the Missouri River
Valley into northern Ontario. These is an increasing likelihood
for a prolonged north gale event over Lake Michigan Late Sunday
night into Tuesday, with the strongest gales in excess of 40 knots
Monday morning into the evening for the Indiana nearshore. The
prolonged wind and long fetch will likely result in waves
potentially to 15 feet along the Indiana nearshore and 10 feet
for portions of the Illinois nearshore on Monday.





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NWS LOT Office Area Forecast Discussion