SPC Convective Outlook Day 1

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960
ACUS01 KWNS 240524
SWODY1
SPC AC 240522

Day 1 Convective Outlook
NWS Storm Prediction Center Norman OK
1122 PM CST Fri Jan 23 2026

Valid 241200Z - 251200Z

...NO SEVERE THUNDERSTORM AREAS FORECAST...

...SUMMARY...
Severe thunderstorms are not forecast today.

...Northwest/North Central Gulf Coast...

Late-evening water-vapor imagery depicts a well-defined upper low
off the Baja Peninsula. This feature is forecast to eject across the
central Baja around mid day as a 500mb speed max rounds the base of
the trough, then ejects into northeast Mexico by 25/06z. In response
to this speed max, a weak surface low should develop along the polar
front over the northwest Gulf basin, then lift northeast across
southeast LA into southern MS late in the period. Latest model
guidance suggests modified Gulf air mass will return to the northern
Gulf coast ahead of this weak surface low, but forecast soundings
depict a boundary layer that most likely will not recover adequately
for surface-based convection. While MUCAPE will increase ahead of
the front, any thunderstorms that form will likely be at least
slightly elevated in nature.

Early in the period there is some concern for a few robust
thunderstorms near the TX Gulf coast. However, polar front will
surge offshore near the start of the day1 and the primary concern
for organized storms will be quickly shunted southeast off the
coast. At this time the probability for severe thunderstorms appears
too low to warrant a MRGL Risk.

..Darrow/Thornton.. 01/24/2026

$$

The "Convective Outlooks" issued by SPC can be thought of as a detailed discussion of the Severe Thunderstorm threat and it's associated risks nationwide. Risk levels range from Marginal to Slight, Enhanced, Moderate, and High and are issued based on the likelihood of 3 major severe weather threats; the risk of tornadoes, damaging winds, and hail. These discussions are often heavily laced meteorological terminology that may be difficult to understand without a background in the field. However understanding these discussions shouldn't be thought of as necessary. Instead, should DuPage county fall under one of these threat levels for severe weather, the response should be to have a heightened level of awareness about the deveoloping weather. Keep an eye on the "Watch County Notification" for any active severe weather watches issued for DuPage county; the "Hazardous Weather Outlook" and "Severe Weather Statement" can also be helpful in explaining the developing risk; additionally, watch for "Active Weather Warnings" and keep an eye on our "Regional Satellite and Radar" products which can be viewed with active watches/warnings or lightning activity.

Hazardous Weather Outlook

See Product Description

583
FLUS43 KLOT 240957
HWOLOT

Hazardous Weather Outlook
National Weather Service Chicago/Romeoville IL
357 AM CST Sat Jan 24 2026

ILZ003>006-008-010>013-019>021-023-032-033-039-103>108-INZ001-002-
010-011-019-251000-
Winnebago-Boone-McHenry-Lake IL-Ogle-Lee-De Kalb-Kane-DuPage-
La Salle-Kendall-Grundy-Kankakee-Livingston-Iroquois-Ford-
Northern Cook-Central Cook-Southern Cook-Northern Will-
Southern Will-Eastern Will-Lake IN-Porter-Newton-Jasper-Benton-
357 AM CST Sat Jan 24 2026 /457 AM EST Sat Jan 24 2026/

This Hazardous Weather Outlook is for portions of north central
Illinois...northeast Illinois and northwest Indiana.

.DAY ONE...Today and Tonight.

Weather hazards expected...

Elevated Excessive Cold Risk this morning.
Elevated Snow Risk Tonight.

DISCUSSION...

Bitterly cold weather will persist through this morning, with wind
chills ranging from 20 to 30 below.

Lake effect snow showers will persist across parts of northern
Porter and possibly parts of northeast Lake County in northwest
Indiana early this morning. This will lead to slippery conditions
due to snow-covered roads.

Accumulating snow will spread across the region late this
afternoon and tonight, particularly near and east of I-55,
resulting in hazardous travel conditions.

Extensive ice cover on area rivers may cause localized ice jam
flooding.

.DAYS TWO THROUGH SEVEN...Sunday through Friday.

Sunday...
Limited Excessive Cold Risk.
Elevated Snow Risk.
Monday...
Elevated Excessive Cold Risk in the morning.
Tuesday night through Friday...
Limited Excessive Cold Risk mainly at night.
Wednesday...
Limited Snow Risk.

DISCUSSION...

Accumulating snow will continue on Sunday, especially southeast of
a Peru to Waukegan, Illinois line. Several inches of fluffy snow
will likely lead to hazardous travel conditions.

Another period of bitterly cold conditions is expected late Sunday
night into Monday morning.

Extensive ice cover on area rivers may cause localized ice jam
flooding.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will not be necessary through tonight.

$$

LMZ740>745-251000-
Winthrop Harbor to Wilmette Harbor IL-
Wilmette Harbor to Northerly Island IL-
Northerly Island to Calumet Harbor IL-
Calumet Harbor IL to Gary IN-Gary to Burns Harbor IN-
Burns Harbor to Michigan City IN-
357 AM CST Sat Jan 24 2026

This Hazardous Weather Outlook is for portions of the Illinois
nearshore waters of Lake Michigan and the Indiana nearshore
waters of Lake Michigan.

.DAY ONE...Today and Tonight.

No hazardous weather is expected at this time.

.DAYS TWO THROUGH SEVEN...Sunday through Friday.

Sunday and Monday...
Hazardous conditions for small craft are likely.
Elevated Freezing Spray Risk.
Tuesday through Friday...
Hazardous conditions for small craft are likely.

$$

Carlaw

Visit us at www.weather.gov/chicago

The "Hazardous Weather Outlook" contains information regarding any and all weather expected to occur within the region that could be hazardous to travel, life or property. This is one of our most highly recommended products to check on a daily basis, and it some cases multiple times per day should significant weather be expected to affect DuPage county.

SPC Convective Outlook Day 2

See Product Description

212
ACUS02 KWNS 240715
SWODY2
SPC AC 240713

Day 2 Convective Outlook CORR 1
NWS Storm Prediction Center Norman OK
0113 AM CST Sat Jan 24 2026

Valid 251200Z - 261200Z

...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS OVER PORTIONS OF
THE EASTERN GULF COAST...

CORRECTED FOR GRAPHIC ERROR

...SUMMARY...
Strong to severe thunderstorms are possible across parts of the
eastern Gulf Coast states Sunday into Sunday night. Damaging gusts
are expected to be the primary risk.

...Synopsis...
A broad positively tilted larger-scale mid-level trough over the
central US is forecast to intensify Sunday as it moves eastward and
absorbs several smaller perturbations ejecting from the Rockies and
western CONUS. The most prominent of these smaller-scale features
will move from the Sabine Valley and central Gulf Coast,
northeastward into the Tennessee Valley and central Appalachians by
Monday night. Amplification of the overall trough and southwesterly
cyclonic flow aloft will support the development of a weak surface
low ahead of the cold front moving into the Southeast. Southerly
flow ahead of this low will result in modest modification inland of
a remnant Gulf air mass south of a large Arctic intrusion/cold air
damming. Weak buoyancy and strong forcing will likely support a band
of thunderstorms with the potential for some strong/severe storms
through parts of the eastern Gulf Coast Sunday afternoon.

...Eastern Gulf Coast States...
Gradual destabilization is expected early Sunday first over southern
LA and MS as the surface low and warm front lift northward. Strong
isentropic ascent over the shallow Arctic air mass will likely
support a band of initially elevated convection from portions of
East TX into southern LA and MS gradually spreading eastward. With
time, these storms will encounter the northward advancing modified
warm sector as the cold front impinges on the western edge of the
moisture return through the day.

Weak destabilization peaking around 500-750 J/kg of MLCAPE will
overlap with strong deep-layer shear of 50-60 kt. This will allow
for some intensification/organization of the ongoing storms where
the near surface air mass can destabilize. Likely linear in nature
owing to the strong frontal forcing, a few stronger segments appear
plausible, especially across southeastern Alabama and the Florida
Panhandle into southwestern Georgia late Sunday afternoon and
evening. Damaging gusts would be primary risk given 50-70 kt flow in
the lowest 1-3 km AGL. A brief QLCS tornado is also possible, but
less certain as the low-level wind field gradually veers through the
day as the main ascent lifts away to the north.

..Lyons.. 01/24/2026

$$

The "Convective Outlooks" issued by SPC can be thought of as a detailed discussion of the Severe Thunderstorm threat and it's associated risks nationwide. Risk levels range from Marginal to Slight, Enhanced, Moderate, and High and are issued based on the likelihood of 3 major severe weather threats; the risk of tornadoes, damaging winds, and hail. These discussions are often heavily laced meteorological terminology that may be difficult to understand without a background in the field. However understanding these discussions shouldn't be thought of as necessary. Instead, should DuPage county fall under one of these threat levels for severe weather, the response should be to have a heightened level of awareness about the deveoloping weather. Keep an eye on the "Watch County Notification" for any active severe weather watches issued for DuPage county; the "Hazardous Weather Outlook" and "Severe Weather Statement" can also be helpful in explaining the developing risk; additionally, watch for "Active Weather Warnings" and keep an eye on our "Regional Satellite and Radar" products which can be viewed with active watches/warnings or lightning activity.

SPC Convective Outlook Day 3

See Product Description

395
ACUS03 KWNS 240831
SWODY3
SPC AC 240830

Day 3 Convective Outlook
NWS Storm Prediction Center Norman OK
0230 AM CST Sat Jan 24 2026

Valid 261200Z - 271200Z

...NO THUNDERSTORM AREAS FORECAST...

...SUMMARY...
Thunderstorms appear unlikely Monday.

...Synopsis...
Mid-level troughing and strong cyclonic flow aloft will shift
southward over the US before gradually moving offshore Monday. A
second trough is expected to move south out of Canada into the Great
Lakes as it also intensifies. The mid-level flow pattern is forecast
to continue to amplify with troughing persisting over the eastern
US. In turn, ridging is forecast to build over the central and
western portions of the country with increasingly strong
northwesterly flow.

At the surface, a robust and widespread Arctic air mass with strong
high pressure will dominate the lower 48 as a cold front moves
offshore into the Atlantic and down the FL Peninsula. Widespread
winter weather and cold temperatures will largely preclude robust
inland surface moisture outside of coastal south FL. However, weak
lapse rates and only glancing ascent suggests thunderstorm potential
here is low. Thus, thunderstorms and severe weather appear unlikely
over the US on Monday.

..Lyons.. 01/24/2026

$$

The "Convective Outlooks" issued by SPC can be thought of as a detailed discussion of the Severe Thunderstorm threat and it's associated risks nationwide. Risk levels range from Marginal to Slight, Enhanced, Moderate, and High and are issued based on the likelihood of 3 major severe weather threats; the risk of tornadoes, damaging winds, and hail. These discussions are often heavily laced meteorological terminology that may be difficult to understand without a background in the field. However understanding these discussions shouldn't be thought of as necessary. Instead, should DuPage county fall under one of these threat levels for severe weather, the response should be to have a heightened level of awareness about the deveoloping weather. Keep an eye on the "Watch County Notification" for any active severe weather watches issued for DuPage county; the "Hazardous Weather Outlook" and "Severe Weather Statement" can also be helpful in explaining the developing risk; additionally, watch for "Active Weather Warnings" and keep an eye on our "Regional Satellite and Radar" products which can be viewed with active watches/warnings or lightning activity.

Special Weather Statement

See Product Description

No active Special Weather Statement for DuPage County.

The "Special Weather Statement" details notable weather either occuring or expected to occur, but does not necessarily have to be considered severe or hazardous. This is a supplementary product issued by the National Weather Service to help describe noteworthy weather. It's terminology should be reasonably easy to understand by the general public.

Watch County Notification

See Product Description

No active Watch County Notification for DuPage County.

The "Watch County Notification" will contain updates regarding active severe weather watches that pertain to DuPage county. This may be for a newly issued watch, or the cancelation of an existing watch. Severe weather watches come in two forms; Severe Thunderstorm and Tornado, and it should be noted that a Severe Thunderstorm Watch does NOT rule out the possibility of tornadoes occuring. It generally means that the tornado threat is minimal while damaging winds and hail are still likely. See our "Watch, Warning, and Advisory Criteria" for more detailed information on the differences and critera for watches, warnings and advisory for all forms of weather.

Winter Weather Statement

See Product Description

735
WWUS43 KLOT 240751
WSWLOT

URGENT - WINTER WEATHER MESSAGE
National Weather Service Chicago IL
151 AM CST Sat Jan 24 2026

ILZ006-103-104-241800-
/O.NEW.KLOT.WW.Y.0005.260125T0000Z-260126T0000Z/
Lake IL-Northern Cook-Central Cook-
Including the cities of Waukegan, Schaumburg, Oak Lawn, Oak Park,
La Grange, Gurnee, Mundelein, Des Plaines, Cicero, Buffalo Grove,
Northbrook, Chicago, Evanston, and Palatine
151 AM CST Sat Jan 24 2026

...WINTER WEATHER ADVISORY IN EFFECT FROM 6 PM THIS EVENING TO 6 PM
CST SUNDAY...

* WHAT...Snow expected. Total snow accumulations between 2 and 6
inches, highest within a few miles of the lakeshore. Lower snow
totals are forecasted across western portions of Lake and northern
Cook counties.

* WHERE...Central Cook, Lake IL, and Northern Cook Counties.

* WHEN...From 6 PM this evening to 6 PM CST Sunday.

* IMPACTS...Roads, and especially bridges and overpasses, will
likely become slick and hazardous.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Be prepared for slippery roads. Slow down and use caution while
driving. If you are going outside, watch your first few steps taken
on stairs, sidewalks, and driveways. These surfaces could be icy and
slippery, increasing your risk of a fall and injury.

During lake effect snow, the weather can vary from bands of locally
heavy snow to dry weather just a few miles away. Visibilities can
also vary greatly. Be prepared for rapid changes in weather,
visibility, and road conditions.

&&

$$

ILZ013-019>021-023-032-105>108-241800-
/O.NEW.KLOT.WW.Y.0005.260125T0000Z-260126T0000Z/
DuPage-La Salle-Kendall-Grundy-Kankakee-Livingston-Southern Cook-
Northern Will-Southern Will-Eastern Will-
Including the cities of Downers Grove, Beecher, Fairbury,
Lombard, Naperville, Streator, Channahon, Ottawa, Manhattan,
Oswego, Oak Forest, Lemont, Calumet City, Carol Stream, Wheaton,
Crete, Plano, Park Forest, Morris, Plainfield, Marseilles,
Pontiac, Yorkville, Orland Park, Bradley, Mendota, Minooka,
Bourbonnais, Joliet, Bolingbrook, Dwight, Kankakee, Wilmington,
Peotone, La Salle, Mokena, and Coal City
151 AM CST Sat Jan 24 2026

...WINTER WEATHER ADVISORY IN EFFECT FROM 6 PM THIS EVENING TO 6 PM
CST SUNDAY...

* WHAT...Snow expected. Total snow accumulations between 2 and 5
inches, highest east of Interstate 55. Lower snow totals are
forecasted across northwestern portions of La Salle, Kendall, and
DuPage counties.

* WHERE...Portions of central, north central, and northeast Illinois.

* WHEN...From 6 PM this evening to 6 PM CST Sunday.

* IMPACTS...Roads, and especially bridges and overpasses, will
likely become slick and hazardous.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Be prepared for slippery roads. Slow down and use caution while
driving. If you are going outside, watch your first few steps taken
on stairs, sidewalks, and driveways. These surfaces could be icy and
slippery, increasing your risk of a fall and injury.

&&

$$

ILZ033-039-INZ010-011-019-241800-
/O.NEW.KLOT.WW.Y.0005.260125T0000Z-260126T0300Z/
Iroquois-Ford-Newton-Jasper-Benton-
Including the cities of Fowler, Kentland, DeMotte, Rensselaer,
Watseka, Gilman, Roselawn, Paxton, Morocco, Gibson City, and
Oxford
151 AM CST Sat Jan 24 2026 /251 AM EST Sat Jan 24 2026/

...WINTER WEATHER ADVISORY IN EFFECT FROM 6 PM CST /7 PM EST/ THIS
EVENING TO 9 PM CST /10 PM EST/ SUNDAY...

* WHAT...Snow expected. Total snow accumulations between 4 and 7
inches.

* WHERE...In Illinois, Ford and Iroquois Counties. In Indiana,
Benton, Jasper, and Newton Counties.

* WHEN...From 6 PM CST /7 PM EST/ this evening to 9 PM CST /10 PM
EST/ Sunday.

* IMPACTS...Roads, and especially bridges and overpasses, will
likely become slick and hazardous.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Be prepared for slippery roads. Slow down and use caution while
driving. If you are going outside, watch your first few steps taken
on stairs, sidewalks, and driveways. These surfaces could be icy and
slippery, increasing your risk of a fall and injury.

&&

$$

INZ001-002-241800-
/O.NEW.KLOT.WW.Y.0005.260125T0000Z-260126T0600Z/
Lake IN-Porter-
Including the cities of Merrillville, Chesterton, Valparaiso,
Hammond, Portage, and Gary
151 AM CST Sat Jan 24 2026

...WINTER WEATHER ADVISORY IN EFFECT FROM 6 PM THIS EVENING TO
MIDNIGHT CST SUNDAY NIGHT...

* WHAT...Snow expected. Total snow accumulations between 3 and 6
inches.

* WHERE...Lake IN and Porter Counties.

* WHEN...From 6 PM this evening to midnight CST Sunday Night.

* IMPACTS...Roads, and especially bridges and overpasses, will
likely become slick and hazardous.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Be prepared for slippery roads. Slow down and use caution while
driving. If you are going outside, watch your first few steps taken
on stairs, sidewalks, and driveways. These surfaces could be icy and
slippery, increasing your risk of a fall and injury.

&&

$$

Ogorek

The "Winter Weather Statement" is a product aimed at the general public that will discuss impacts caused by winter weather. This may include information about watches, warnings and advisories as well as details about impactful winter weather that may not warrant the issuance of a watch, warning or advisory.

Severe Weather Statement

See Product Description

No active Severe Weather Statement for DuPage County.

The "Severe Weather Statement" is a product aimed at the general public that will discuss impacts caused by severe thunderstorms. This may include information about watches and warnings as well as details about impactful "sub-severe" weather that may not warrant the issuance of a watch or warning which sometimes may come when a watch or warning has been canceled.

Non-Precip Statement

See Product Description

911
WWUS73 KLOT 240758
NPWLOT

URGENT - WEATHER MESSAGE
National Weather Service Chicago IL
158 AM CST Sat Jan 24 2026

ILZ003>006-008-010>013-019>021-023-032-103-105>108-241800-
/O.EXT.KLOT.CW.Y.0002.000000T0000Z-260124T1800Z/
Winnebago-Boone-McHenry-Lake IL-Ogle-Lee-De Kalb-Kane-DuPage-La
Salle-Kendall-Grundy-Kankakee-Livingston-Northern Cook-Southern
Cook-Northern Will-Southern Will-Eastern Will-
Including the cities of Buffalo Grove, Lombard, Gurnee, Sycamore,
Joliet, Manhattan, Woodstock, Naperville, Fairbury, Minooka,
Rockford, La Salle, Bolingbrook, Orland Park, Park Forest,
Belvidere, Byron, Downers Grove, Dwight, Des Plaines, Aurora,
Wheaton, Wilmington, Crete, Oswego, Morris, Rochelle, Kankakee,
Schaumburg, Pontiac, Channahon, McHenry, Mokena, Yorkville,
Streator, Bourbonnais, Plainfield, Palatine, Beecher, Waukegan,
Coal City, Calumet City, Plano, Lemont, Carol Stream, Mundelein,
Ottawa, Crystal Lake, Mendota, Bradley, Peotone, Elgin,
Northbrook, DeKalb, Marseilles, Evanston, Algonquin, Dixon, Oak
Forest, and Oregon
158 AM CST Sat Jan 24 2026

...COLD WEATHER ADVISORY NOW IN EFFECT UNTIL NOON CST TODAY...

* WHAT...Very cold wind chills as low as 25 to 30 below this morning.

* WHERE...Portions of central, north central, and northeast Illinois.

* WHEN...Until noon CST today.

* IMPACTS...The dangerously cold wind chills as low as 25 to 30
below zero could cause frostbite on exposed skin in as little as
30 minutes.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Dress in layers including a hat, face mask, and gloves if you must
go outside.

To prevent water pipes from freezing; wrap or drain or allow them to
drip slowly.

Keep pets indoors as much as possible.

Make frequent checks on older family, friends, and neighbors.

&&

$$

ILZ033-039-INZ001-002-010-011-019-241800-
/O.EXT.KLOT.CW.Y.0002.000000T0000Z-260124T1800Z/
Iroquois-Ford-Lake IN-Porter-Newton-Jasper-Benton-
Including the cities of Portage, Gilman, Chesterton, Oxford,
DeMotte, Gibson City, Morocco, Hammond, Merrillville, Watseka,
Paxton, Gary, Kentland, Roselawn, Fowler, Rensselaer, and
Valparaiso
158 AM CST Sat Jan 24 2026 /258 AM EST Sat Jan 24 2026/

...COLD WEATHER ADVISORY NOW IN EFFECT UNTIL NOON CST /1 PM EST/
TODAY...

* WHAT...Very cold wind chills as low as 20 to 25 below this morning.

* WHERE...In Illinois, Ford and Iroquois Counties. In Indiana,
Benton, Jasper, Lake IN, Newton, and Porter Counties.

* WHEN...Until noon CST /1 PM EST/ today.

* IMPACTS...The dangerously cold wind chills as low as 20 to 25
below zero could cause frostbite on exposed skin in as little as
30 minutes.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Limit time outdoors. If you go outdoors, wear appropriate clothing
including a hat and gloves.

Make frequent checks on older family, friends, and neighbors.

Keep pets indoors as much as possible.

&&

$$

ILZ104-241800-
/O.EXT.KLOT.CW.Y.0002.000000T0000Z-260124T1800Z/
Central Cook-
Including the cities of Chicago, Cicero, Oak Park, Oak Lawn, and
La Grange
158 AM CST Sat Jan 24 2026

...COLD WEATHER ADVISORY NOW IN EFFECT UNTIL NOON CST TODAY...

* WHAT...Very cold wind chills as low as 20 to 30 below this morning.

* WHERE...Central Cook County.

* WHEN...Until noon CST today.

* IMPACTS...The dangerously cold wind chills as low as 30 below zero
could cause frostbite on exposed skin in as little as 10 to 30
minutes.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Dress in layers including a hat, face mask, and gloves if you must
go outside.

Residents of the city of Chicago can call 3 1 1 to request well
being checks for elderly friends or family members, or for
information on finding the nearest warming center.

To prevent water pipes from freezing; wrap or drain or allow them to
drip slowly.

Keep pets indoors as much as possible.

&&

$$

The "Non-Precip Statement" is aimed at the general public and will detail notable weather that is either occuring or expected to occur, but does not relate to any form of precipitation. These would include but are not limited to high winds, reduced visibility or extreme temperatures.

Active Weather Warnings

Tornado Warnings

No active Tornado Warnings.

Severe Thunderstorm Warnings

No active Severe Thunderstorm Warnings.

Flood Warnings

No active Flood Warnings.

General Tornado/Severe Weather Safety

1. A Tornado or Severe Thunderstorm Warning is issued when it has been reported, or when it has been detected via National Weather Service radar. It is to be interpreted that this event is occuring and is expected to affect all warned areas. Those within the warning need to take action immediately.
2. If under a warning remain calm and if it is necessary to seek shelter. Students and Employees should head to their nearest designated shelter area. The route to these shelter areas are posted in all rooms on campus and signs are placed in the hallways to direct you to the nearest shelter area. Review these instructions and be familiar with where your nearest shelter is. Stay indoors, away from windows and large unsupported ceilings. Faculty should account for their students and Supervisors should account for their areas employees.
3. If outside, take shelter in the nearest building.
4. After the storm has passed, dial Police at 911 to report any injuries or damage to buildings.
5. If the building is severely damaged, evacuate the building as soon as possible after the storm has passed.