Peotone Weather

National Weather Service Forecast for: 2 Miles SE Peotone, IL Issued by: National Weather Service Chicago/Romeoville, IL

Updated: Thu, 05-Mar-2026 3:06pm CST

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Peotone, IL

This Afternoon Mostly Cloudy Friday Areas Of Fog then Patchy Fog Saturday Chance Showers And T-Storms then Mostly Cloudy Sunday Sunny Monday Sunny Tuesday Showers And T-Storms Likely Wednesday Rain Showers   Hi 52 °F Hi 72 °F Hi 62 °F Hi 61 °F Hi 72 °F Hi 72 °F Hi 58 °F     Tonight Areas Of Fog Friday Night Slight Chance Showers And T-Storms then Showers And T-Storms Saturday Night Partly Cloudy Sunday Night Clear Monday Night Slight Chance Rain Showers Tuesday Night Showers And T-Storms Wednesday Night Slight Chance Rain And Snow Showers   Lo 44 °F Lo 61 °F Lo 34 °F Lo 45 °F Lo 50 °F Lo 47 °F Lo 27 °F

Forecast from NOAA-NWS for 2 Miles SE Peotone, IL.

710
FXUS63 KLOT 052055
AFDLOT

Area Forecast Discussion
National Weather Service Chicago/Romeoville, IL
255 PM CST Thu Mar 5 2026

.KEY MESSAGES...

- Expect periods of dense fog through Friday morning. The
  longest duration of very low visibility will be near the
  lakeshore.

- Friday through Friday night will be windy and unseasonably
  warm, with a period of showers and embedded thunderstorms
  during a portion of the morning and then more widespread
  showers and scattered storms late Friday night into early
  Saturday. Some of these storms may be strong to even severe,
  though confidence is low.

&&

.DISCUSSION...
Issued at 254 PM CST Thu Mar 5 2026

Through Friday Night:

A small, slow-moving mid-level low that fostered dense fog over
the area last night into this morning has now exited east of
the area. Associated patches of drizzle and isolated showers are
also waning, with precip-free conditions favored late this
afternoon through this evening. Meanwhile, dense fog has
persisted over Lake Michigan through the day, with some of the
fog spilling inland amid weak N/NE flow. So while diurnal
influences and limited deeper forcing have allowed visibility to
improve nearly area-wide, there is decent concern that dense
fog will expand back inland across northeast Illinois this
evening and overnight while winds gradually veer SE. Given
persistence along the shore, have extended the Dense Fog
Advisory through tonight for the Illinois shore and through this
evening for the Indiana shore, with a westward expansion
possibly required this evening.

A mid-level disturbance originating from northwest Mexico will
provide sufficient forcing for convection to develop late this
afternoon and early evening over the panhandle of Texas and
western Oklahoma. Resulting convective enhancement of the
disturbance should the bring a more compact northeastward across
western Missouri late tonight to Wisconsin by Friday afternoon.
Expectations are for a cluster of rain/showers with embedded
elevated thunderstorms to track across at least the northwest
half of the CWA very late tonight through mid-morning Friday.
Strong low-level moisture transport and unseasonably high PWATs
will yield locally heavy rain with this precip, with a narrow
swath of 1-2" possible. Also cannot rule out small hail with any
discrete cells ahead or southeast of the main precip shield
given modest convective layer shear.

Strong low-level SW flow will advect the warm sector over our
area on Friday ahead of deep troughing shifting across the
central CONUS. Morning convection will likely reinforce a warm
front across northern Illinois, with drizzle and/or isolated
showers persisting north of the front during the afternoon.
There is some indication that the northward progression of the
front may struggle during the day, but ultimately pass north of
the forecast area by sunset. Away from the Illinois lakeshore,
temps should push well into the 60s and likely at least into the
low 70s (near or at record highs) by the afternoon.

Given weak capping and a lack of broader forcing in the warm
sector over the CWA Friday afternoon and evening, dry conditions
are favored during this period. However, the kinematic and
thermodynamic setup remains favorable for discrete supercell
structures with primarily large hail conditional on any
convective initiation.

A cold front will then approach the area from the northwest
late Friday night as the trough to the west ejects toward the
Upper Mississippi River Valley. While an axis of convection is
expected to precede the front prior to daybreak Saturday, the
diurnally unfavorable period suggests there may be just enough
near surface stability to prevent damaging winds at the
surface. That said, the very strong kinematic environment and
anomalously high low-level moisture suggest that near surface
stability could be removed and allow for locally damaging winds
at the surface with any convection.

Kluber


Saturday through Thursday:

The surface cold front will quickly sweep eastward across the
area early Saturday morning. While some ongoing showers and
storms could be ongoing across far eastern IL and northwestern
IN around daybreak Saturday morning, expect this activity to
end with the frontal passage. Temperatures will start the early
morning in the upper 50s to the low 60s, which should be the
high for the day for most areas across northern IL. Temperatures
are then expected to drop off through the 50s during the day as
breezy westerly winds (gusting up to 30 mph) set up in the wake
of the front.

For areas that don`t receive much rain through early Saturday
morning, we`ll need to monitor for elevated fire danger on
Sunday and Monday due to mild temps paired with fairly low dew
points and gusty southwest winds. Both Monday and a part of
Tuesday look quite warm (highs possibly 70+ for a good chunk of
the area). Thereafter, ensembles continue to favor a stronger
cold frontal passage sometime late Tuesday into Tuesday night.
Much cooler weather will move in across the region in the wake
of this front for the second half of the week. However, as it
moves across the area through Tuesday night/Wednesday morning,
it looks to become the focus for periods of heavy rain producing
showers and thunderstorms. Near record precipitable water
values and the potential for some training showers and storms
suggest that some notable rainfall amounts may occur in or near
the region. Unfortunately, confidence is low this far out with
the specifics of which areas will be most at risk for any
excessive rainfall amounts. This will need to continue to be
monitored.

KJB

&&

.AVIATION /18Z TAFS THROUGH 00Z SATURDAY/...
Issued at 1146 AM CST Thu Mar 5 2026

Key Messages:

- Fog and low stratus persist through early Friday afternoon.

- Thunderstorm threat, particularly Friday morning.

While some minor diurnal CIG and VSBY improvements are expected
this afternoon, dense fog is expected to quickly build back
inland off of Lake Michigan after sunset this evening. It thus
looks to be another soupy night, especially across the Chicago
area terminals. Areas of dense fog will likely persist in this
area into early Friday morning, with conditions slatted to
quickly improve with the northward passage of a warm front into
Friday afternoon.

In addition to the low stratus and fog, there also continues to
be a threat for a 2-4 hour period of showers and thunderstorms
Friday morning. The best potential for this round of showers
and thunderstorms is across northwestern IL into parts of far
northeastern IL. With this in mind, have opted to include a
tempo group for TS at RFD. However, for the Chicago terminals I
have opted to hold onto the going PROB30 for now.

Winds will be light to calm through tonight, primarily from an
east to northeast component. On Friday, winds will increase
from the southeast (10+ kt) in the morning, then become breezy
from the south-southwest with the northward passage of a warm
front early to mid Friday afternoon.

KJB

&&

.LOT WATCHES/WARNINGS/ADVISORIES...
IL...Dense Fog Advisory until 6 AM CST Friday for ILZ006-ILZ103.

     Dense Fog Advisory until 6 AM CST Friday for ILZ104.

IN...Dense Fog Advisory until 9 PM CST this evening for INZ001-
     INZ002.

LM...Dense Fog Advisory until 6 AM CST Friday for the IL and IN
     nearshore waters.

&&

$$

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