Peotone Weather
National Weather Service Forecast for: Peotone IL
Issued by: National Weather Service Chicago, IL
Updated: 8:16 am CDT Oct 20, 2018

Peotone, IL
 
Today

Today: A slight chance of rain showers between 2pm and 3pm, then a chance of rain and snow showers.  Mostly sunny, with a high near 51. Windy, with a northwest wind 15 to 20 mph increasing to 25 to 30 mph in the afternoon. Winds could gust as high as 45 mph.  Chance of precipitation is 50%.
Sunny and
Breezy then
Chance
Rain/Snow and
Windy
Tonight

Tonight: Mostly clear, with a low around 27. Blustery, with a northwest wind 15 to 20 mph decreasing to 5 to 10 mph after midnight. Winds could gust as high as 30 mph.
Mostly Clear
and Blustery
then Clear

Sunday

Sunday: Sunny, with a high near 49. West southwest wind 5 to 10 mph.
Sunny


Sunday
Night
Sunday Night: Mostly clear, with a low around 35. South southwest wind around 10 mph.
Mostly Clear


Monday

Monday: Mostly sunny, with a high near 59. Southwest wind around 10 mph, with gusts as high as 15 mph.
Mostly Sunny


Monday
Night
Monday Night: Mostly clear, with a low around 37.
Mostly Clear


Tuesday

Tuesday: Sunny, with a high near 53.
Sunny


Tuesday
Night
Tuesday Night: Mostly clear, with a low around 33.
Mostly Clear


Wednesday

Wednesday: Sunny, with a high near 53.
Sunny


Hi 51 °F Lo 27 °F Hi 49 °F Lo 35 °F Hi 59 °F Lo 37 °F Hi 53 °F Lo 33 °F Hi 53 °F

Hazardous Weather Outlook
Special Weather Statement
 

Today
 
A slight chance of rain showers between 2pm and 3pm, then a chance of rain and snow showers. Mostly sunny, with a high near 51. Windy, with a northwest wind 15 to 20 mph increasing to 25 to 30 mph in the afternoon. Winds could gust as high as 45 mph. Chance of precipitation is 50%.
Tonight
 
Mostly clear, with a low around 27. Blustery, with a northwest wind 15 to 20 mph decreasing to 5 to 10 mph after midnight. Winds could gust as high as 30 mph.
Sunday
 
Sunny, with a high near 49. West southwest wind 5 to 10 mph.
Sunday Night
 
Mostly clear, with a low around 35. South southwest wind around 10 mph.
Monday
 
Mostly sunny, with a high near 59. Southwest wind around 10 mph, with gusts as high as 15 mph.
Monday Night
 
Mostly clear, with a low around 37.
Tuesday
 
Sunny, with a high near 53.
Tuesday Night
 
Mostly clear, with a low around 33.
Wednesday
 
Sunny, with a high near 53.
Wednesday Night
 
Partly cloudy, with a low around 34.
Thursday
 
Partly sunny, with a high near 52.
Thursday Night
 
Mostly cloudy, with a low around 36.
Friday
 
Partly sunny, with a high near 53.

 

Forecast from NOAA-NWS for Peotone IL.

000
FXUS63 KLOT 201359
AFDLOT

Area Forecast Discussion
National Weather Service Chicago/Romeoville, IL
859 AM CDT Sat Oct 20 2018

.UPDATE...856 AM CDT

The warmest and least windy portion of the day is ongoing this
morning, but winds will be ramping up soon. Upstream in Wisconsin
the strong PV anomaly is driving a mix of rain, graupel, and snow
with the transition occurring as you head farther north.

The initial band of isolated/scattered showers should be liquid,
and arriving late morning to around the noon hour, given the
warmer initial conditions. Several areas of additional shower
activity are upstream closer to the main trough, and forecast
soundings suggest mid afternoon could feature some mixed precip
rain/graupel and possibly snow will be found in the stronger
convective shower activity.

Generally wind gusts upstream have peaked in the 40-45 mph range,
though a few gusts to 50 mph are certainly not unreasonable and
have been reported toward LaCrosse. Loose objects will blow
around, and small twigs are susceptible in this strong cold
advection regime.

KMD

&&

.SHORT TERM...
300 AM CDT

Very windy and raw conditions are expected today, with falling
temperatures and rain/snow/graupel showers at times. Winds
diminish tonight under clear skies, making for chilly temps
overnight.

Early morning GOES-16 water vapor imagery depicts a deep mid-
level short wave digging southward across far western Ontario.
This feature, associated with an anomalously cold mid-level cold
pool and strong jet, will move quickly south across the western
Great Lakes this morning. This deep wave is reflected at the
surface by a strong secondary cold frontal trough, which will push
from north to south across the forecast area during the mid-
morning through mid-afternoon hours. A combination of a tightening
surface pressure gradient, steep low level lapse rates associated
with low level cold advection and the mid-level cold pool, and a
strong isallobaric (change in surface pressure) gradient will
result in very windy conditions, with winds shifting to the
northwest and increasing to 20-25 mph with gusts near 40 mph
behind the front later this morning. Forecast soundings depict a
very deep mixed layer, with adiabatic lapse rates to near 700 mb.
Resulting instability will support convective showers, which
despite well-above freezing surface temps may mix with graupel or
even some wet snow at times, as wet bulb zero heights below 1000
ft agl are likely. High temps will likely come this morning in
many locations, especially north of I-80, with readings falling
through the afternoon in strong cold advection regime. By evening,
precipitation will have shifted east, and only a few lake effect
rain or rain/snow showers will persist across eastern Porter
county.

While very windy today, prevailing sustained and gust speeds are
expected to top out just a bit below wind advisory criteria. Thus
am not planning an advisory at this time, but will highlight winds
in HWO and an SPS. Convective showers may be able to transport
higher momentum gusts in excess of 40 mph to the surface at times,
but this would be localized and of short duration. With the
strong winds and long northerly fetch, waves 10 feet or higher
along the Indiana shore could cause some minor beach/lakeshore
flooding, especially in Porter county where the fetch will be most
favorable for higher waves.

Winds will diminish fairly quickly during the evening, as high
pressure builds southward just west of the Mississippi River.
Clear skies, diminishing winds and cold air mass will support
chilly overnight lows in the mid-upper 20s in most areas by
sunrise Sunday morning.

Ratzer

&&

.LONG TERM...
300 AM CDT

Sunday through Friday...

Cooler than average and mainly dry weather will persist through
much of the period, as the upper flow pattern continues to feature
large scale troughing across the eastern CONUS, and ridging in
the west. Next chance of precipitation of any note appears to hold
off until the end of week or even into next weekend.

Sunday starts out with strong height rises aloft in the wake of
Saturday`s deep short wave. Large scale subsidence dominates the
region, as surface high pressure spreads southeast into the Ohio
Valley by Sunday night. The day will start off rather chilly, with
lows in the 20s in many areas. Winds will shift southwest as the
northern periphery of the surface ridge axis shifts off to the
east, though despite sunny skies and a dry air mass highs will
only reach the upper 40s and lower 50s.

With the mean upper trough axis east of the region, and northwest
flow aloft, a short wave is progged to ripple southeast from
central Canada into the Great Lakes region Monday and Monday
night. Low pressure tracks well to the north of the forecast area,
though a trailing cold front is progged to push southeast across
the cwa during the afternoon and evening hours. Warm advection on
southwest winds ahead of the front may make Monday the warmest of
the next several days, with 925 mb guidance temps supporting highs
from the upper 50s to lower 60s. Forecast soundings maintain dry
moisture profiles, and a dry fropa is expected with no guidance
producing any qpf.

Height rises and subsidence then build across the region again
Monday night, as the eastern long wave trough drifts eastward, and
upper ridging spreads east across the central CONUS. Guidance
depicts surface high pressure building across the western Great
Lakes region through mid-week, maintaining dry and cooler than
average weather Tuesday through Thursday. Models continue to
depict a weak cut-off wave drifting east from the Plains late in
the period, with some detail/strength differences amongst various
solutions. The ECMWF has trended weaker and slower similar to the
GFS and GEM solutions however, holding of any significant rain
until beyond the end of the forecast period.

Ratzer

&&

.AVIATION...
For the 12Z TAFs...

640 am...Primary forecast concern remains strong/gusty northwest
winds today. Additional forecast concerns include precip chances
early this afternoon.

No significant changes from the previous forecast. A strong cold
front will move across the terminals late this morning shifting
westerly winds to the northwest with quickly increasing speeds and
gusts. Best timing for this increase based off the latest forecast
soundings is 15z-16z at ord/mdw so opted to maintain current
timing but minor tweaks may be needed. Prevailing gusts in the
mid/upper 30kt range still look on track with some higher peak/
isolated gusts possible. Wind speeds/gusts are expected to slowly
diminish through the afternoon and then quickly diminish around/
just after sunset.

Scattered showers are possible behind this cold front from late
morning through early afternoon. It appears the best chances for
precip will be across northeast IL into northwest IN. Given how
unstable the low levels are behind this front...the precip will
likely be convective and as much colder air spreads across the
area...some mixed rain/snow/snow pellets are possible which may
allow visibilities to briefly drop into ifr. Mvfr cigs are also
possible during this time. cms

&&

.MARINE...

330 am...A strong cold front will move across the area late this
morning. The combination of a tight gradient and much colder air
spreading across the area behind this front will result in
northwest gales quickly developing during the late morning hours.
Gusts into the 40-45kt range are expected with these gusts slowly
diminishing during the mid/late afternoon with gales likely done
by early evening. Speeds will continue to diminish overnight as
high pressure moves from the northern Plains this afternoon to the
Ohio Valley by Sunday evening. cms

&&

.LOT WATCHES/WARNINGS/ADVISORIES...
IL...None.
IN...None.
LM...Small Craft Advisory...IN nearshore waters until 9 AM Saturday.

     Gale Warning...nearshore waters until
     10 PM Saturday.

&&

$$

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NWS LOT Office Area Forecast Discussion