Peotone Weather
National Weather Service Forecast for: Peotone, IL
Issued by: National Weather Service Chicago/Romeoville, IL
Updated: Tue, 22-Oct-2019 10:16am CDT

Peotone, IL

Today: Scattered Rain Showers
Scattered Rain Showers

Wednesday: Mostly Sunny
Mostly Sunny

Thursday: Mostly Cloudy
Mostly Cloudy

Friday: Mostly Sunny
Mostly Sunny

Saturday: Sunny

Sunday: Slight Chance Rain Showers
Slight Chance Rain Showers

Monday: Mostly Sunny
Mostly Sunny
Hi 52 °F Hi 61 °F ↓ Hi 53 °F Hi 52 °F Hi 57 °F Hi 60 °F Hi 55 °F  

Tonight: Partly Cloudy
Partly Cloudy
Wednesday Night: Slight Chance Rain Showers
Slight Chance Rain Showers
Thursday Night: Mostly Cloudy
Mostly Cloudy
Friday Night: Mostly Clear
Mostly Clear
Saturday Night: Partly Cloudy then Slight Chance Rain Showers
Partly Cloudy then Slight Chance Rain Showers
Sunday Night: Slight Chance Rain Showers then Partly Cloudy
Slight Chance Rain Showers then Partly Cloudy
Monday Night: Partly Cloudy
Partly Cloudy
Lo 36 °F ↑ Lo 40 °F Lo 36 °F Lo 32 °F Lo 40 °F Lo 39 °F Lo 38 °F  


Scattered rain showers before 2pm. Mostly cloudy, with a high near 52. West southwest wind 20 to 25 mph, with gusts as high as 40 mph. Chance of precipitation is 40%. New rainfall amounts less than a tenth of an inch possible.
Partly cloudy. Low around 36, with temperatures rising to around 38 overnight. West southwest wind 10 to 20 mph, with gusts as high as 35 mph.
Mostly sunny. High near 61, with temperatures falling to around 59 in the afternoon. Southwest wind 10 to 15 mph, with gusts as high as 25 mph.
Wednesday Night
A slight chance of rain showers between 7pm and 1am. Mostly cloudy, with a low around 40. West southwest wind 5 to 10 mph. Chance of precipitation is 20%.
Mostly cloudy, with a high near 53. North northwest wind around 5 mph.
Thursday Night
Mostly cloudy, with a low around 36.
Mostly sunny, with a high near 52.
Friday Night
Mostly clear, with a low around 32.
Sunny, with a high near 57.
Saturday Night
A slight chance of rain showers after 1am. Partly cloudy, with a low around 40.
A slight chance of rain showers. Mostly sunny, with a high near 60.
Sunday Night
A slight chance of rain showers before 7pm. Partly cloudy, with a low around 39.
Mostly sunny, with a high near 55.
Monday Night
Partly cloudy, with a low around 38.


Forecast from NOAA-NWS for Peotone, IL.

FXUS63 KLOT 221544

Area Forecast Discussion
National Weather Service Chicago/Romeoville, IL
1044 AM CDT Tue Oct 22 2019

1044 AM CDT

As advertised, it`s a windy, cloudy and cool day. No changes were
made to the going Wind Advisory. However, gusts in the past hour
or so have generally been below the 45 mph advisory criteria. A
few sites are around the 30 mph sustained wind advisory criteria.
A look at the KLOT VWP and recent aircraft soundings indicates
that the near/over 40 kt winds are at 3kft AGL and up. Thus the
fact that cloud bases are generally below 3kft AGL, below the
higher speeds, is likely contributing to wind gust magnitude
being tempered somewhat. There are steep enough lapse rates from
the surface to the cloud bases that occasional gusts around 45 mph
will remain possible in and near the wind advisory area. With
this in mind, no changes were made to the advisory, but if winds
don`t start to pick up to solidly at or above criteria over the
next few hours, we may consider cancelling it early.

Aside from the strong west-southwest winds, there are isolated to
widely scattered showers across most of the CWA, so did expand
shower mention southward to account for these trends. Shower
activity should tend to diminish once to the early afternoon,
though some isolated showers or sprinkles will remain possible
north of I-80.



246 AM CDT

Through Tonight...

Impressive look at the mid latitude cyclone pinwheeling around the
upper Midwest on satellite early this morning with its expansive
warm and dry conveyor belt structure. The surface low is reaching
its modeled strength around 987 mb with the cold front now shifted
through and a bent back occlusion/secondary cold advection
area back across Iowa. We will get another surge of winds with
the increasing low level jet to the west along with the cold
advection around and shortly after daybreak when the tighter
pressure gradient and stronger pressure couplet will pass
overhead. Gusts to 40 to 45 kt have been observed across western
Iowa in this stronger gradient that will shift into portions of
our area today.

The best pressure couplet will largely graze the area, but areas
along and northwest of Chicago will get into the more favored wind
axis. We don`t feel expanding the advisory farther south and east is
warranted given that the low will eventually start to fill and lift
north. So while a few advisory level gusts (45 mph + ) may occur
outside of the advisory, they appear to be brief. The period of
strongest winds does seem to be centered on the morning hours.

Meanwhile, the comma cloud shield consists of showers that will
likely impact many areas today, and will make for a cool,
cloudy, windy, and occasionally damp day. As these showers roll
through they will also locally enhance the winds that are able to
make it to surface and therefore expect this potential today when
you are under any precipitation.

The low will pull away from the region tonight and weaken as it does
so. When this occurs, warm advection out ahead of a fast moving
system across the northern Plains will drive warm front into
northern IL and northwest IN early Wednesday which will become
the focus for additional rain chances.



246 AM CDT

Wednesday through Monday...

A period of relatively quiet weather compared to the past 24 hours
is expected into this weekend.

Wednesday through Thursday night: A mid-level trough axis rotating
around the remnant deep cyclonic flow from the current system will
phase with a quick-moving north Pacific shortwave trough over the
northern Great Plains early Wednesday. This wave will brush the CWA
just to the north Wednesday evening. Low-level WAA/FGEN ahead of
this wave will support a band or two of light rain primarily north
of I-88, but most likely closer to and north of the Wisconsin state
line, late Wednesday afternoon and evening.

A cold front behind the wave will shift south across much of the CWA
late Wednesday night into Thursday morning before stalling over or
just south of the far southern CWA. Continued FGEN along with some
increase in low-level moisture transport into the region will result
in additional bands of light rain Thursday afternoon and night. The
southeast third of the CWA roughly south of a line from Pontiac to
Kankakee to Valparaiso may reside under one of these light rain
bands late Thursday afternoon into Thursday night.

Friday and Saturday: Surface and mid-level ridging will quickly
build into the region on Friday, with the surface ridge crossing
all or at least a portion of the CWA Friday night. This will set
the stage for a potential freeze across a decent portion of the
CWA, with lows in the low 30s to locally upper 20s. WAA will ensue
on Saturday with increasing southerly winds, but conditions
should remain dry through the day.

Sunday and Monday: Guidance begins to vary considerably with the
evolution of the southern Great Plains/western Gulf of Mexico low
late in the week. The ECMWF/CMC bring this system quickly northward
across the area Saturday night and Sunday while the GFS ejects the
system well southeast of the area on Saturday. However, guidance
does agree to some extent that deep troughing will begin to form
over the western CONUS early next week, setting the stage for a
period of active weather to close out October.



For the 12Z TAFs...

Primary concerns through this period are mainly strong SW winds
and MVFR ceilings today.

An increasing pressure gradient on the southern flank of a strong
low pressure system near western Lake Superior will pivot across
northern Illinois and northwest Indiana through this afternoon. SW
wind gusts to around 35 knots will continue through the morning
hours. Wind direction will likely settle at around 230 degrees
during this time before gradually veering to around 250 by late
afternoon. A few gusts to 40 knots are possible at all sites this
morning, primarily at RFD. Winds will slowly diminish during the
afternoon, but remain gusty through tonight.

MVFR ceilings are spreading across the area this morning and will
continue through much of the day before becoming SCT or lifting into
VFR levels this evening. Isolated to scattered -SHRA will accompany
the MVFR ceilings for a period this morning. Ceilings may reach low-
end MVFR levels with the -SHRA.



246 AM CDT

More gales are expected today with no new changes to the Gale
headline. Frequent gale gusts to 35 knots are expected into this
afternoon, with a few gusts to 40 knots possible along the
Illinois nearshore. Winds will gradually diminish through the
afternoon into this evening, with gales possible ending earlier
than the current ending time of 9pm CDT.



IL...Wind Advisory...ILZ003-ILZ004-ILZ005-ILZ006-ILZ008-ILZ010-ILZ011-
     ILZ012-ILZ019-ILZ020 until 3 PM Tuesday.

LM...Gale Warning...nearshore waters until 9
     PM Tuesday.





NWS LOT Office Area Forecast Discussion