Peotone Weather
National Weather Service Forecast for: Peotone, IL
Issued by: National Weather Service Chicago/Romeoville, IL
Updated: Wed, 24-Jan-2018 4:46am CST


Wednesday: Occasional Snow Showers
Occasional Snow Showers

Thursday: Mostly Sunny
Mostly Sunny

Friday: Mostly Sunny
Mostly Sunny

Saturday: Chance Light Rain
Chance Light Rain

Sunday: Mostly Sunny
Mostly Sunny

Monday: Mostly Sunny
Mostly Sunny

Tuesday: Partly Sunny
Partly Sunny
  Hi 33 °F ↓ Hi 44 °F Hi 50 °F Hi 46 °F Hi 36 °F Hi 33 °F Hi 40 °F

Overnight: Occasional Snow Showers
Occasional Snow Showers
Wednesday Night: Mostly Cloudy
Mostly Cloudy
Thursday Night: Mostly Clear
Mostly Clear
Friday Night: Mostly Cloudy then Chance Light Rain
Mostly Cloudy then Chance Light Rain
Saturday Night: Slight Chance Light Rain then Partly Cloudy
Slight Chance Light Rain then Partly Cloudy
Sunday Night: Partly Cloudy
Partly Cloudy
Monday Night: Partly Cloudy
Partly Cloudy
Lo 27 °F Lo 23 °F Lo 31 °F Lo 39 °F Lo 27 °F Lo 20 °F Lo 21 °F  

Winter Weather Advisory

Occasional snow showers before 5am, then occasional snow showers and occasional freezing drizzle. Cloudy, with a low around 27. Northwest wind around 5 mph.
Occasional snow showers and occasional freezing drizzle before 1pm. Cloudy. High near 33, with temperatures falling to around 27 in the afternoon. West northwest wind 5 to 10 mph.
Wednesday Night
Mostly cloudy, with a low around 23. South southwest wind 0 to 5 mph.
Mostly sunny, with a high near 44. South wind 5 to 10 mph.
Thursday Night
Mostly clear, with a low around 31. South wind 5 to 15 mph.
Mostly sunny, with a high near 50.
Friday Night
A chance of rain after midnight. Mostly cloudy, with a low around 39. Chance of precipitation is 30%.
A chance of rain. Partly sunny, with a high near 46.
Saturday Night
A slight chance of rain before 6pm. Partly cloudy, with a low around 27.
Mostly sunny, with a high near 36.
Sunday Night
Partly cloudy, with a low around 20.
Mostly sunny, with a high near 33.
Monday Night
Partly cloudy, with a low around 21.
Partly sunny, with a high near 40.


Forecast from NOAA-NWS for Peotone, IL.

FXUS63 KLOT 241112

Area Forecast Discussion
National Weather Service Chicago/Romeoville, IL
512 AM CST Wed Jan 24 2018

513 AM CST

Have issued a Winter Weather Advisory for freezing drizzle causing
a light glaze on untreated surfaces, in effect until 9am CST. For
much of the overnight, it appeared there was sufficient ice
crystals in the clouds for mostly flurries as precipitation type
falling from the the stratus deck. However, in the last hour or
so, a substantial (10kft) dry layer aloft noted on the KLOT VWP
appears to have resulted in enough ice crystal loss for freezing
drizzle mixed in with flurries. Outside the office, over the past
hour, we went from dry pavement to a light glaze on surfaces, with
freezing drizzle occurring as of 5am. There have been reports of
numerous accidents on interstates, including some serious ones.
With the threat of icy roads continuing as the morning commute is
about to start, opted to quickly get a Winter Weather Advisory
area wide.

As the next short-wave crossing the MS River arrives noted by
light echoes on regional radar mosaic, KDVN VWP shows little or
no intervening dry layer, suggesting that seeder-feeder should
allow transition back to very light snow or flurries will occur
this morning. There is uncertainty on how long this will take to
occur, so have freezing drizzle mention in the grids and the
advisory in effect until 15z/9am CST.



259 AM CST

Through tonight...

The main concern today is cloud cover trends and flurries/light
snow potential. Regarding the flurries, short-wave disturbances
noted on W/V imagery have been causing occasional flurries through
the night and even some very patchy drizzle/mist at times. It also
appears that there may be some airplane seeding going on near ORD
which has reported briefly lower visibility down to 1-2 miles, and
stronger radar echoes responsible seem to correlate with flight
paths. The next short-wave is approaching the MS River from
eastern IA and will translate across the area through mid
day/early afternoon. Have kept occasional flurries mention during
much of this time and gradually end it from the west and northwest
later this morning. As previous AFD update mentioned, seeder
feeder processes could assist despite drier layers noted on
soundings. Brief periods of steadier light snow are possible that
could knock down visibility slightly and even produce patchy
dustings, but feel that for most of the time that occasional
flurry mention will suffice for this activity.

Expansive stratus deck noted on GOES-16 nightime microphysics RGB
covers much of the region, with primary hole in OVC appearing to
be over far NE IA, western WI and southeast MN and additional
stratus extending back well west of this. It`s uncertain that the
patchy clearing of the low clouds will make it into the CWA and
overall have trended more pessimistic with sky trends today. It
appears the best chance for the low clouds to scatter to just mid
clouds during daylight hours would be in the western and northwest
CWA. Given the expectation of cloudy/mostly cloudy conditions
much of the day, temperatures which have been held up overnight by
the OVC should conversely struggle to rise today and cut back
slightly by a degree or two from previous forecast, with still
low-mid 30s forecast highs. Lower level flow will turn
southwesterly tonight and strengthen, so do expect the stratus to
finally lift northeast assuming it doesn`t clear much during the
day. Light southerly winds shouldn`t be an impediment to some
radiational cooling to low-mid 20s for most of the area. Coolest
locations should be in northeast Boone, McHenry and Lake counties
in the upper teens to around 20 due to the deeper snow cover in
that area.



328 AM CST

Thursday through Tuesday...

Our up and down temperature roller coaster will continue through
day 7. A warm front lifting north on Thursday, mostly sunny skies
and stout warm advection is expected to support temperatures
rising well into the 40s for much of the area. The possible
noteworthy exception to this is for portions of far northern
Illinois that have solid snow cover from Monday night. Since
southerly winds should stay generally less than 10 mph and mixing
won`t be all that deep given strong inversion at 850 mb, high
temperatures from northeast Boone across the northern half or 2/3
of McHenry and Lake counties stand to be limited to the mid to
upper 30s. After a quiet and mild for late January Thursday night
with strengthening southerly winds, Friday remains on track to be
unseasonably mild with mostly sunny to partly cloudy skies.
Southwest winds will become strong and gusty and in fact if mixing
is deep enough, gusts up to 35 mph or even 40 mph are possible.
Have continued with highs in the lower 50s across most of the
area, perhaps slightly limited in areas with snow cover.

Guidance continues to vary on the extent of light rain coverage
with a southwest flow disturbance Friday night into Saturday, with
operational ECMWF a bit more on the bullish side. There is however
decent agreement on the rain focusing southeast of I-55, so
maintained low-mid chance PoPs for central Illinois into parts of
NW Indiana. Areas northwest could remain dry or mostly dry. The
unseasonably mild conditions will continue Friday night into
Saturday ahead of the next cold frontal passage, which will come
through Saturday night. The models have trended back a bit
stronger with the next cold shot driven by approach of strong
~1040 mb high arriving Sunday into Monday. Will also need to
watch for magntitude of northern stream clipper type wave
embedded in long wave trough, as some recent model runs, namely
the ECMWF indicate light snow/snow shower potential with this
outside of any lake effect snow which should be mainly east.

Monday will feature near to slightly below normal high temperatures
under the strong surface high, with the pendulum then briefly
swinging back to above normal for Tuesday-Wednesday as the high
shifts east. Beyond day 7, longer range guidance is pointing to
the return of a predominantly colder pattern late next week. In
the transition period, depending on how the surface and mid-upper
pattern evolves, a wintry system is possible somewhere over the



For the 12Z TAFs...

Primary aviation concern this morning is FZDZ threat, with lesser
concern being the duration of MVFR stratus lingering.

Flurries and very light snow grains have recently begun changing
to freezing drizzle over the western and southern Chicago suburbs.
This trend will likely continue northeast into the other terminals
and have added FZDZ to the TAFs through mid morning. Seeder-feeder
from higher clouds moving east into NW IL should allow FZDZ to
transition back to very light snow or flurries by mid morning.

Otherwise, stratus deck is unlikely to clear tonight as light flow
and low sun angle don`t favor significant changes in the areal
coverage of the stratus which extends north to central WI and west
into eastern IA. As low level southerly flow off the deck
increases tonight, should see stratus deck be blown north out of
the area.

- Izzi


126 AM CST

Fairly tranquil weather on the lake the next couple days as a
ridge of high pressure gradually moves across the region. Later
Thursday night into Friday southerly winds will strengthen, with a
period of southerly gales possible Friday, particularly northern
Lake Michigan. Unseasonably mild air moving over cold lake will
likely limit the magnitude of the winds some and may keep winds
just shy of gale force over southern portions of the lake where
stability issues will be greatest. A pair of cold fronts will move
across the lake Friday night and then the second Saturday night.
The stronger winds and more substantial cold air push will occur
behind the second front later Saturday night into Sunday.

- Izzi


IL...Winter Weather Advisory...ILZ003-ILZ004-ILZ005-ILZ006-ILZ008-
     ILZ022-ILZ023-ILZ032-ILZ033-ILZ039 until 9 AM Wednesday.

IN...Winter Weather Advisory...INZ001-INZ002-INZ010-INZ011-INZ019
     until 9 AM Wednesday.





NWS LOT Office Area Forecast Discussion