Peotone Weather

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

Updated: Wed, 30-Apr-2025 10:26am CDT

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Peotone, IL

Today Mostly Cloudy then Chance Rain Showers Thursday Showers And T-Storms Friday Partly Sunny then Chance Rain Showers Saturday Mostly Sunny Sunday Sunny Monday Sunny Tuesday Sunny   Hi 66 °F Hi 70 °F Hi 65 °F Hi 59 °F Hi 68 °F Hi 75 °F Hi 77 °F     Tonight Showers And T-Storms Thursday Night Showers And T-Storms then Chance Showers And T-Storms Friday Night Chance Rain Showers Saturday Night Mostly Clear Sunday Night Mostly Clear Monday Night Mostly Clear Tuesday Night Partly Cloudy   Lo 55 °F Lo 50 °F Lo 42 °F Lo 41 °F Lo 47 °F Lo 50 °F Lo 52 °F

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

614
FXUS63 KLOT 301131
AFDLOT

Area Forecast Discussion
National Weather Service Chicago/Romeoville, IL
631 AM CDT Wed Apr 30 2025

.KEY MESSAGES...

- Periods of rain and some thunderstorms, particularly tonight
  through Thursday. Locally heavy rainfall amounts up to 2".

- Above normal temperatures and dry conditions over the weekend
  and into early next week

&&

.DISCUSSION...
Issued at 323 AM CDT Wed Apr 30 2025

Through Thursday:

A mid/upper-level trough will eject out of the Desert Southwest
this morning, then drive an attendant surface low east-
northeastward across the Southern Plains into the Ozarks this
afternoon and evening before shifting across our area into
Thursday. Ultimately, this system will result in some periods of
inclement weather across our area, particularly tonight and on
Thursday.

While all is quiet locally early this morning, we are watching
an area of showers and thunderstorms currently moving into
southwestern MO. This activity is associated with a lead
convectively enhanced impulse that is expected to track
northeastward into IL later this morning and into this
afternoon. Fortunately, it will be moving into a much drier and
stable airmass with northeast extent over IL. Accordingly, a
weakening trend is expected through the morning.

Nevertheless, some light rain showers are likely (60% chance)
to shift into at least southern sections of the area (south of
I-80) later this morning into the midday timeframe. Some of
these light showers could even make their way into far northern
IL and northwestern IN mid to late this afternoon (after 3 PM).
However, easterly low-level flow across far northern IL is
expected to continue a steady feed of drier air in the low
levels through most of the afternoon. This may hence result in
only some very light showers as far north as the Chicago metro
area through early this evening. Otherwise, expect seasonable
inland temperatures in the low to mid 60s today, with cooler
onshore flow keeping temperatures in the lower 50s along the IL
lakeshore.

Rain chances will ramp-up significantly across the area
tonight, most notably after midnight as the main slug of
moisture advects northward into the region just ahead of the
approaching surface low and surface warm front. Steepening mid-
level lapse rates overnight will also support some embedded
thunderstorms towards morning. This in combination with healthy
deep layer moisture (Precipitable Water values 1.4"+) will
support the possibility of locally heavy rainfall amounts
(possibly as much as 1-2") across parts of northeastern IL and
northwestern IN late tonight into early Thursday morning. This
is not currently anticipated to cause any significant flooding
issues, though if some of these heavy rainfall amounts fall over
the urban areas around Chicago, some minor flooding could
result.

Very low clouds and possibly some fog may also develop near the
surface warm front and low track very late tonight into
Thursday morning. While fog is possible, particularly on Lake
Michigan, this has been left out of the official forecast for
now. Any low visibilities that result will improve into the
afternoon as the surface low begins to shift into Lower
Michigan.

Additional periods of showers and thunderstorms are expected on
Thursday, particularly near and in advance of a surface cold
front, that looks to reside near the I-55 corridor into the
afternoon. While the threat for strong storms looks low at this
point, due to the lack of much insolation, some storms could
once again produce some locally heavy rainfall amounts Thursday
afternoon.

KJB

Thursday Night through Tuesday:

The center of the surface low should be east of the area on
Thursday night, but the cold front will still be trailing
behind it. Chances for showers and thunderstorms along the front
earlier on Thursday night are expected, but probabilities for
rain drop substantially after midnight as the front exits to the
east. Drier conditions are expected on Friday morning. As an
upper-level trough drops southward from Canada and passes
quickly over the region, there is a 30 to 40 percent chance for
another quick shower Friday afternoon/evening, but there is low
confidence in coverage. And given the lack of moisture (relative
to the mid week system), it seems these showers would not pose
any significant impacts.

A surface high will grow through the weekend with an upper-level
ridge building into early next week over the western Great
Lakes. With height rises and a dry air mass, the extended
forecast is expected to be precip free. 850 mb temperatures will
steady increase as the ridge builds and surface temperatures
will slowly return to 10+ degrees above seasonal normal values
by early next week.

DK

&&

.AVIATION /12Z TAFS THROUGH 18Z THURSDAY/...
Issued at 630 AM CDT Wed Apr 30 2025

Key Aviation Messages for the current TAF period:

- Increasing chances for rain through the latter half of the
  TAF window

- MVFR cigs/vis are expected with the rain, with the potential
  for IFR cigs after 06Z

A low pressure system will gradually move through the area
overnight Wednesday through Thursday. As the warm front
associated with it moves north Wednesday evening, the chances
for rain increase with it. There are four main windows being
monitored:

1.) on Wednesday afternoon, the first push of moisture aloft
ahead of the front will increase cloud cover over the area.
Maybe a sprinkle reaches the ground, but drier air near the
surface should keep it virga, therefore no formal mention in the
TAF.

2.) Wednesday evening will be the first window for the
chances for rain as more moisture feeds in. This window was kept
as a TEMPO due to the lower confidence on exact timing at any
specific terminal. If and when it is raining, MVFR cigs are
expected.

3.) Higher confidence in prevailing rain at terminals
after 06Z. As the low moves closer to the area, there is a
chance for higher rain rates resulting in MVFR cigs/vis with
the potential for IFR cigs.

4.) Rain turns more into rain showers after 12Z, with the
potential for a few breaks. However, IFR/MVFR cigs are expected
to remain.

While the chance for thunder is non-zero through the overnight
and Thursday morning, models are keeping the better instability
farther south (not arriving until Thursday during the day).
Therefore, thunder has been kept out of the TAFs presently.

Winds are light and east northeasterly. As they increase, they
are expected to be out of the southeast between 10 to 15 knots
today. An occasional gust under 20 knots is possible, but should
be fairly sporadic if it were to occur. Winds will return to
the east around 00Z through 12Z as they diminish. After 12Z,
there is low confidence in wind trends for Chicago terminals,
yet moderate confidence near KRFD. It will be determined by the
exact track of the surface low, which models are still
differing. Even just a few miles shift in the low track could
create a period of southerly winds versus northwest winds at
Chicago terminals.

DK

&&

.LOT WATCHES/WARNINGS/ADVISORIES...
IL...None.
IN...None.
LM...None.

&&

$$

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