Peotone Weather
National Weather Service Forecast for: Peotone, IL
Issued by: National Weather Service Chicago/Romeoville, IL
Updated: Fri, 25-Sep-2020 11:16pm CDT

Peotone, IL
 
  Saturday

Saturday: Mostly Sunny
Mostly Sunny
Sunday

Sunday: Mostly Cloudy then Slight Chance Rain Showers
Mostly Cloudy then Slight Chance Rain Showers
Monday

Monday: Rain Showers Likely
Rain Showers Likely
Tuesday

Tuesday: Slight Chance Rain Showers
Slight Chance Rain Showers
Wednesday

Wednesday: Mostly Sunny then Slight Chance Rain Showers
Mostly Sunny then Slight Chance Rain Showers
Thursday

Thursday: Partly Sunny then Chance Showers And Thunderstorms
Partly Sunny then Chance Showers And T-Storms
Friday

Friday: Mostly Sunny
Mostly Sunny
  Hi 85 °F Hi 79 °F Hi 62 °F Hi 63 °F Hi 63 °F Hi 57 °F Hi 56 °F
 
Tonight

Tonight: Mostly Clear
Mostly Clear
Saturday
Night
Saturday Night: Partly Cloudy
Partly Cloudy
Sunday
Night
Sunday Night: Rain Showers Likely
Rain Showers Likely
Monday
Night
Monday Night: Chance Rain Showers
Chance Rain Showers
Tuesday
Night
Tuesday Night: Slight Chance Rain Showers
Slight Chance Rain Showers
Wednesday
Night
Wednesday Night: Slight Chance Rain Showers then Partly Cloudy
Slight Chance Rain Showers then Partly Cloudy
Thursday
Night
Thursday Night: Chance Showers And Thunderstorms then Mostly Cloudy
Chance Showers And T-Storms then Mostly Cloudy
 
Lo 59 °F Lo 64 °F Lo 54 °F Lo 47 °F Lo 46 °F Lo 43 °F Lo 38 °F  

 

Tonight
 
Mostly clear, with a low around 59. South wind 5 to 10 mph.
Saturday
 
Mostly sunny, with a high near 85. South southwest wind 10 to 20 mph, with gusts as high as 35 mph.
Saturday Night
 
Partly cloudy, with a low around 64. South southwest wind 15 to 20 mph, with gusts as high as 30 mph.
Sunday
 
A slight chance of rain showers after 1pm. Mostly cloudy, with a high near 79. West southwest wind 5 to 15 mph. Chance of precipitation is 20%.
Sunday Night
 
Rain showers likely. Mostly cloudy, with a low around 54. North northwest wind 5 to 10 mph. Chance of precipitation is 60%.
Monday
 
Rain showers likely. Mostly cloudy, with a high near 62. Chance of precipitation is 60%.
Monday Night
 
A chance of rain showers. Mostly cloudy, with a low around 47. Chance of precipitation is 40%.
Tuesday
 
A slight chance of rain showers. Partly sunny, with a high near 63.
Tuesday Night
 
A slight chance of rain showers before 1am. Partly cloudy, with a low around 46.
Wednesday
 
A slight chance of rain showers after 1pm. Mostly sunny, with a high near 63.
Wednesday Night
 
A slight chance of rain showers before 7pm. Partly cloudy, with a low around 43.
Thursday
 
A chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 57.
Thursday Night
 
A chance of showers and thunderstorms before 7pm. Mostly cloudy, with a low around 38.
Friday
 
Mostly sunny, with a high near 56.

 

Forecast from NOAA-NWS for Peotone, IL.

619
FXUS63 KLOT 260200
AFDLOT

Area Forecast Discussion
National Weather Service Chicago/Romeoville, IL
900 PM CDT Fri Sep 25 2020

.UPDATE...
900 PM CDT

Overall the forecast this evening remains in good shape. Did
nudge down low temperatures tonight a bit outside of the metro in
areas that have been quick to cool already this evening. Have also
increased sky cover across our southeastern zones toward daybreak
to account for hi-res guidance hinting at the potential for
stratus to lift north into that area.

Otherwise still expect a warm and breezy day on Saturday with
highs in the mid 80s and south southwesterly winds gusting to 25
to 30+ mph.

Petr

&&

.SHORT TERM...
225 PM CDT

Through Saturday night...

A summer time breeze has picked up across the area this afternoon
and is a bit of a precursor of things to come. Main weather
concerns are the warm temperatures and breezy/windy conditions on
Saturday.

The upper level flow across the northern tier of the United States
is certainly looking a bit more active upstream with a upper jet
slamming into the Pacific northwest and this will begin to dig a
upper trough across the upper Midwest. But before we jump ahead,
the pressure gradient is increasing ahead of a lead upper low
across north central Manitoba. This gradient will remain firm and
increase as the upper jet spread into the upper Midwest and spin
up a surface low across the plains on Saturday. Strong southwest
flow will not only pump in some summer-like mid 80s highs
tomorrow, but expect winds to pick up a tad, with gusts of 30-35
mph certainly plausible in this regime. Highest winds will be in
the mid to late afternoon. Model RH fields suggest 35-40 percent
on the lower end. Given the dry fuels and breezy conditions, some
limited fire weather concerns do still exist -- and could be more
elevated if dewpoints were a bit lower.

Saturday night will continue the breezy and unseasonably
mild conditions from the daytime hours as strengthening low
pressure (merging areas of low pressure) quickly tracks from
western Wisconsin to near James Bay by Sunday morning. Ahead of
the trailing cold front, south to southwest winds will gust to
25-35 mph through the evening and the early overnight. Overnight
lows will be summer- like in the lower to mid 60s outside Chicago
and upper 60s downtown.

KMD

&&

.LONG TERM...
306 PM CDT

Sunday through Friday...

While there continues to be high confidence that we will turn to a
much cooler and more unsettled weather pattern next week as a
pattern shift occurs, there continues to be somewhat lower
confidence with the day-to-day specifics, especially mid to late
next week.

On Sunday we will have a cold frontal boundary shifting
southeastward across the area. This will result in our coolest
temperatures (in the low to mid 70s) over far north central and
northwestern IL, and our warmest readings (low 80s) over my east
central IL and northwestern IN counties. While the front itself
should move through mainly precipitation free, this does not
appear to be the case in its wake. Increasing large scale forcing
for ascent (attendant to the digging upper trough over the Upper
Midwest) late Sunday into Sunday night looks likely to complement
a strengthening lower level frontogenetic circulation along the
lingering baroclinic zone. This should support an area of post
frontal rain developing over the area, first over northwestern and
parts of far north central IL Sunday afternoon, then across the
rest of the area Sunday evening and night. It appears that some a
good soaking rain could occur with this activity into Monday
morning, before the upper trough axis and lower-level baroclinic
zone shift to our east during the day Monday.

Lingering cloud cover and a cool airmass overhead should keep
temperatures in the 60s for daytime highs on Monday. It does
appear the main threat for more widespread rain may come to an end
early Monday, with the possibilities for only some occasional
widely scattered showers thereafter through midweek. With this in
mind, I limited POPs to low end chance during this period.

Temperatures should remain in the 60s again Tuesday, but there are
some signs that the temperatures around Wednesday could warm
briefly before another reinforcing shot of cold air shifts back
over the area later in the week as another significant impulse
looks to top the western CONUS ridge and dig in over the Great
Lakes. This could result in another good chance for showers on
Thursday, with temperatures potential remaining in the 50s for the
late week period.

KJB

&&

.AVIATION...
For the 00Z TAFs...

Primary concerns through the TAF period:

* Gusty south southwesterly winds Saturday
* Low potential for MVFR (or lower) stratus Saturday AM

Winds have eased this evening but will likely remain elevated around
10 kts overnight as the low level jet sets up over the area which
could allow for occasional gusts to mix down. Surface winds are
currently expected to remain high enough to preclude a formal
mention of low level wind shear in the TAF but will note the
marginal LLWS potential overnight and again tomorrow night.

A region of MVFR stratus across southern Illinois may try to lift
north into the area toward daybreak. Have opted to add a FEW020
mention to hint at this potential. Current thinking is this will
remain southeast of the terminals. Will continue to watch this
for later TAF updates.

After daybreak, winds are expected to quickly ramp up out of the
south southwest as the pressure gradient tightens and stronger
gusts mix down to the surface. Expect gusts in the upper 20kt
range to near 30kt possible at times during the afternoon hours.
Winds will likely remain elevated into the evening hours before
easing overnight.

Petr

&&

.LOT WATCHES/WARNINGS/ADVISORIES...
IL...None.
IN...None.
LM...Small Craft Advisory...LMZ740-LMZ741-LMZ742-LMZ743-LMZ744-
     LMZ745...noon Saturday to 4 AM Sunday.

&&

$$

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