Peotone Weather

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

Updated: 4:16 am CST Feb 23, 2019

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Peotone, IL

Today Showers Likely and Patchy Fog Tonight Showers and Patchy Fog then Scattered Showers and Windy Sunday Windy. Scattered Rain/Snow then Partly Sunny Sunday Night Partly Cloudy and Windy Monday Partly Sunny Monday Night Mostly Cloudy Tuesday Mostly Cloudy Tuesday Night Mostly Cloudy Wednesday Chance Snow Hi 47 °F Lo 33 °F Hi 33 °F⇓ Lo 9 °F Hi 22 °F Lo 11 °F Hi 29 °F Lo 20 °F Hi 32 °F

Hazardous Weather Outlook
High Wind Watch
 

Forecast from NOAA-NWS for Peotone IL.

000
FXUS63 KLOT 230920
AFDLOT

Area Forecast Discussion
National Weather Service Chicago/Romeoville, IL
320 AM CST Sat Feb 23 2019

.SHORT TERM...
320 AM CST

Through Sunday Night...

A potent winter storm will track across the region through Sunday,
bringing periods of rain today and tonight, some snow showers Sunday
morning, and very strong winds late tonight through Sunday.

Synopsis: A strong, negatively-tilted trough over northern NM early
this morning will track NE to the Great Lakes region through Sunday
morning. An associated surface low will gradually deepen over the
central Great Plains today, then quickly deepen to around 980mb near
far northern Lake Michigan by Sunday morning.

Near-term through 15Z: A short-wave trough near northwest MO early
this morning will continue to force a shield of precip NE that will
edge into the NW half of the CWA through this morning. As of 3am,
surface temps continue to tick up above freezing for nearly the
entire CWA, with upstream temps also above freezing. However,
surface wet-bulb temps remains slightly below freezing across the NW
CWA. With precip expected across the NW counties by 12Z, am still
anticipating a risk of some patchy icing before wet-bulbs temps rise
above freezing by 15Z. Road temps appear to be generally in the low
to mid 30s, supporting at least some icing risk. Have ultimately
trimmed the winter weather advisory to Ogle, Winnebago and Boone
counties given the current trends in temps and precip.

Wind: E to ESE winds of 10-15mph with infrequent gusts to 20mph are
expected through the day today. Winds will then veer from SE to SW
this evening, with gusts to 30-35mph across the SE half of the CWA,
as the surface low passes to the NW. West winds will then quickly
increase to 30-35mph with gusts of 50 to possibly 60mph late tonight
through Sunday morning as in impressive pressure gradient and
associated pressure falls of 13-16mb over 6 hrs shift across the NW
half of the CWA. Forecast soundings indicate mixing into 50-55kt
winds as low as 900hPa amidst strong CAA throughout the day Sunday.
Guidance remains varied on longevity of the strongest winds,
including the period of potential warning criteria speeds/gusts.
There is some indication that this may end up being a long-duration
high-end advisory event with a 3-6hr period of winds meeting warning
criteria Sunday morning when the strongest CAA aligns with the best
isallobaric wind. After collaboration with neighboring offices,
decided to hold on to the current High Wind Watch given
uncertainties in timing, longevity and magnitude, and the fact
conditions are still 24 hours or more out. This will still allow the
next shift to digest 12Z data and issue a warning, if necessary,
with plenty of lead-time.

Precip/snow: As noted before, the precip shield should affect mainly
the NW half of the CWA through this morning. Meanwhile, broad WAA
will support pockets of light rain across the SE half of the CWA. An
arc of significant low-level moisture transport will shift NE across
the CWA late this afternoon through this evening. This will support
a round of widespread showers, potentially heavy at times across the
entire CWA. As the surface low passes NW of the CWA late tonight and
a mid-level dry slot crosses all but the NW portion of the CWA,
expect precip to change to either light rain or drizzle. CAA will
quickly take hold late tonight, transitioning any remaining rain to
snow by 12-14Z Sunday. The southern extent of the upper trough`s
deformation zone will likely clip the north half of the CWA during
the morning. A period of snow showers will combine with the strong
winds to create very poor visibility and possibly briefly hazardous
road conditions through at least mid-morning Sunday.

Thunder: Mid-level lapse rates steepen in conjunction with the
aforementioned increase in low-level moisture transport late this
afternoon through this evening. A few embedded rumbles of thunder
will be possible across the CWA during this time. There is some
concern that some of these showers/storms could bring down gusty
winds, particularly across the far SE CWA, as winds at 925-850hPa
vary from 35 to 50 knots.

Kluber

&&

.LONG TERM...
245 AM CST

Monday through Friday...

High pressure expected to build across the region at the start of
the period, but with the CWA likely remaining on the edge of this
feature during this time. As this occurs, west northwest flow
will allow some weak energy to traverse the region, with some
upstream light snow development possibly moving across the region
on Monday. Any snow that does approach the area will likely be
weakening, and at this time, don`t anticipate much of any precip
development over the CWA. A fairly similar pattern expected on
Tuesday and Tuesday night, though backing low/mid level winds
could support WAA with slightly higher snow chances. Guidance
varying slightly with overall pattern by Wednesday, but most
showing the possibility for a stronger wave to move across the
region and help provide additional precip chances by midweek. A
lull in the activity is possible by late in the work week, but
with an active pattern possibly returning once again during the
weekend. Below normal temps are expected through much of the
period.

Rodriguez

&&

.AVIATION...
For the 06Z TAFs...

Multiple forecast concerns through the period including...

Light freezing rain around daybreak Saturday for rfd.
Ifr/lifr cigs Saturday morning through Saturday night.
Possible dense fog Saturday afternoon/Saturday evening.
Chance of thunderstorms Saturday evening.
Low level wind shear Saturday evening.
Strong westerly winds Sunday morning.
Chance of snow showers/snow squalls Sunday morning.

Overall...no significant changes to the forecast with general
trends on track.

Light rain is still expected to move across northwest IL toward
daybreak Saturday morning with air temperatures near freezing and
the potential for light freezing rain for a few hours at rfd.
Precip timing still appears to hold off until mid morning for the
Chicago area terminals when air temperatures are expected to be
above freezing. Scattered rain showers will be possible Saturday
but confidence on timing is only medium as there may be some lulls
in the precipitation.

Mid clouds overnight are expected to quickly lower through mvfr
Saturday morning and likely to lifr by Saturday afternoon while
visibilities lower to 1sm or less...especially northwest of a
vys/lot/mdw line. Confidence for how low vis may drop at gyy/mdw
remains low and continued prob mention with this forecast. Its
possible that dense fog develops over parts of the area Saturday
afternoon and may persist into Saturday evening.

Another area of showers with isolated/scattered thunderstorms are
possible Saturday evening. Duration should only be 1-2 hours at
any one location as these race north across the area and if these
do materialize as expected...they should help improve visibilities
and possibly lift cigs.

Easterly winds will continue through Saturday afternoon and shift
southeast Saturday evening...southwest early Sunday morning and
then westerly prior to daybreak Sunday morning. Once the winds
begin to turn southerly...gusts into the 20kt range will be
possible and once winds shift westerly...toward the end of the 30
hour ord/mdw tafs...gusts into the 35kt range are expected. With
these strong winds...colder air will quickly spread across the
area and eventually scattered snow showers or snow squalls will be
possible through mid Sunday morning. cms

&&

.LOT WATCHES/WARNINGS/ADVISORIES...
IL...Winter Weather Advisory...ILZ003-ILZ004-ILZ005-ILZ008 until 9 AM
     Saturday.

     High Wind Watch...ILZ003-ILZ004-ILZ005-ILZ006-ILZ008-ILZ010-
     ILZ011-ILZ012-ILZ013-ILZ014-ILZ019-ILZ020-ILZ021-ILZ022-
     ILZ023-ILZ032-ILZ033-ILZ039...3 AM Sunday to 9 PM Sunday.

IN...High Wind Watch...INZ001-INZ002-INZ010-INZ011-INZ019...3 AM
     Sunday to 9 PM Sunday.

LM...Gale Warning...LMZ740-LMZ741-LMZ742-LMZ743-LMZ744-LMZ745...3 AM
     Sunday to 3 AM Monday.

&&

$$

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NWS LOT Office Area Forecast Discussion