Peotone Weather

National Weather Service Forecast for: Peotone IL Issued by: National Weather Service Chicago, IL

Updated: 10:15 pm CDT Oct 20, 2018

- Select Forecast - Peotone, IL Manteno, IL Beecher, IL Monee, IL Kankakee, IL Willmington, IL Braidwood, IL Manhattan, IL Ottawa, IL Amboy, IL Byron, IL Rockford, IL Quad Cities, IL Champaign/Urbana, IL Peoria, IL Bloomington, IL Springfield, IL Carbondale, IL Vienna, IL Culver, IN

Peotone, IL

Tonight Clear Sunday Sunny Sunday Night Mostly Clear Monday Mostly Sunny Monday Night Mostly Clear Tuesday Sunny Tuesday Night Mostly Clear Wednesday Sunny Wednesday Night Mostly Clear Lo 25 °F Hi 48 °F Lo 35 °F Hi 58 °F Lo 36 °F Hi 53 °F Lo 33 °F Hi 51 °F Lo 33 °F

Hazardous Weather Outlook
 

Forecast from NOAA-NWS for Peotone IL.

000
FXUS63 KLOT 210202
AFDLOT

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

.UPDATE...
902 PM CDT

No big changes to going forecast. Winds continue to diminish and
this trend will continue overnight. Outside of lake effect
cloudiness over northwest IN, skies have cleared. As winds get
fairly light late tonight, some of the typically colder cold air
drainage/sheltered areas could get a bit chillier than current
forecast lows.

The progged 925mb temps Sunday would support high temps around 50,
if not in the lower 50s, so will be briefing oncoming mid shift on
potential for highs a couple degrees warmer Sunday.

- Izzi

&&

.SHORT TERM...
344 PM CDT

Through Sunday...

Near term:

The latest run of the GFS shows a shortwave trough over
southern Quebec. Within it are two smaller wavelength shortwave
troughs: one centered over southeastern Wisconsin and the other
centered over southern Quebec. The primary shortwave trough
influencing conditions over the region is centered over
southeastern Wisconsin. The MRMS operational viewer shows a meso-
low centered over eastern Michigan, likely associated with the
primary upper-level shortwave trough. This meso-low combined with
strong cyclonic vorticity advection due to the tight curvature of
the system producing vorticity values in excess of 40/s, is
creating substantial rising motion over the Great Lakes Region.
KLOT, and other surround radars, show that the mixed precipitation
occurring in the region is the result of convection ahead of a
very strong surface cold front. Isentropic analysis at 280 K
clearly shows the abundance of moisture over the region as well as
the necessary rising motion necessary for a variety of
convectively induced snow storms. As the system propagates
eastward and out of the area through this evening and tonight,
expect the windy conditions to subside and much cooler
temperatures as a result of both diurnal cooling and the frontal
passage.

Short term:

Tomorrow we will quickly recover from the polar
temperatures of tonight as a result of daytime heating and high
pressure building over the region. The latest GFS run suggests
strong 850-hPa cold air advection behind the frontal passage will
build the surface high as synoptic-scale subsidence moves into the
area. It also suggests strong 500-hPa anticyclonic vorticity
advection will only further increase the heights at the surface
and differential anticyclonic vorticity advection will support the
synoptic scale subsidence. Due to the sinking motion developing
over the region and lack of moisture as a result of the polar air
mass, expect clear conditions tomorrow with highs into the upper
40s, primarily the result of daytime heating. Overnight lows
should again fall into the mid 30s with continued subsidence-
induced clear skies.

On Monday, the next shortwave trough looks to develop just north
of the Great Lakes in southern Canada. The main impact will be
cloud cover developing during the day as a result of some
relatively weak 500-hPa creating rising motion over the region,
evident by the latest run of the GFS. The northeast corridor of
the anticyclone that will be positioned over the central Great
Plains will cause 850-hPa warm-air advection from downslope flow
over the Rockies as well, providing further support for some
broken cloud cover through Monday. This warm air advection will
also allow slightly warmer temperatures; expect highs to reach
into the mid to upper 50s and overnight lows into the mid 30s.

DL

&&

.LONG TERM...
315 PM CDT

Sunday night through Saturday...

Continued cool but primarily dry stretch of weather is expected
through most of the upcoming week. Blocking upper ridge that has
been anchored over the west coast the past few days will begin to
break down Sunday night into Monday and upper ridge will gradually
shift east to the Great Plains by midweek. Meanwhile, surface
ridge will build from the Canadian Rockies late this weekend into
the Great Lakes by midweek, and eventually reach New England late
in the week. Temperatures remain cool within this air mass with
highs in the 50s each day this week and lows in the 30s/low 40s.
Next chance for any precip looks to be late in the week, Friday,
as the remnants of the upper low currently off SoCal coast lift
across the Midwest.

BMD

&&

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

Northwest winds will continue to quickly diminish early this
evening, becoming light late tonight as wind back southwest.
Southwest winds will begin to ramp up again by late morning
Sunday, with a few gusts to around 20 kt possible from the
southwest by later Sunday afternoon into early Sunday evening.
Assuming gustiness remains sporadic, then LLWS threat will exist
Sunday evening as winds just off the deck increase to 40-45kt.

- Izzi

&&


.LOT WATCHES/WARNINGS/ADVISORIES...
IL...None.
IN...None.
LM...Gale Warning...nearshore waters until 1
     AM Sunday.

&&

$$

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