SPC Convective Outlook Day 1

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511
ACUS01 KWNS 231238
SWODY1
SPC AC 231237

Day 1 Convective Outlook
NWS Storm Prediction Center Norman OK
0637 AM CST Fri Jan 23 2026

Valid 231300Z - 241200Z

...NO SEVERE THUNDERSTORM AREAS FORECAST...

...SUMMARY...
Scattered weak thunderstorm activity is likely today into tonight
across the Texas Big Bend region into central Texas.

...Synopsis...
Early-morning satellite imagery shows a well-defined upper low off
the northern Baja California coast, with a subtle lead shortwave
moving into northwest Mexico and modest shortwave ridging from
central Mexico into southeast AZ/southwest NM. Largely zonal flow
persists across much of the central and eastern CONUS.

Surface analysis reveals an expansive 1048 mb high extending from
the southern Canadian Prairies through the central Plains, mid MS
Valley, and much of the OH Valley. Very cold temperatures accompany
this high, and an intense cold front is currently pushing southward
across the TX Panhandle, northern OK, and northern AR. This same
front is pushing southeastward across the middle OH Valley.

...Big Bend Region into North/Central Texas...
Some modest low-level moisture advection is ongoing ahead of the
cold front from the TX Coastal Plain into the TX Hill Country. This
advection is forecast to continue throughout the day, likely
bringing upper 50s/low 60s dewpoints as far northwest as the Edwards
Plateau before interacting with the front this afternoon. Heating
will be tempered by abundant cloud cover and mid-level lapse rates
will be poor. Even so, the anticipated low-level moisture coupled
with cold mid-level temperatures should result in a relatively
confined area of moderate buoyancy (i.e. MLCAPE 500-1000 J/kg)
tonight. Additionally, deep-layer vertical shear will be strong,
resulting in environmental conditions that could support a
strong/marginally severe storm or two. However, the overall threat
will be mitigated by the undercutting nature of the cold front and
likely storm interactions. The limited duration and isolated nature
of the severe threat currently precludes the need for probabilities.

Farther north and west, a large area of precipitation is expected to
develop behind the front, supported by the strengthening
southwesterly flow aloft and associated broad isentropic ascent.
Cooling mid-level temperatures may result in minimal buoyancy
(mostly after 03Z), with a few deeper convective elements within the
precipitation shield capable of producing lightning amid freezing
rain and/or sleet.

..Mosier/Broyles.. 01/23/2026

$$

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

903
FLUS43 KLOT 231102
HWOLOT

Hazardous Weather Outlook
National Weather Service Chicago/Romeoville IL
502 AM CST Fri Jan 23 2026

ILZ003>006-008-010>013-019>021-023-032-033-039-103>108-INZ001-002-
010-011-019-241115-
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-
502 AM CST Fri Jan 23 2026 /602 AM EST Fri Jan 23 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...

Significant Excessive Cold Risk.
Limited Snow Risk far NE Porter County.

DISCUSSION...

Dangerously cold conditions will occur today, with wind chills
ranging from 20 to 40 below this morning. The coldest conditions
will occur north and west of I-55.

Lake effect snow showers are expected across parts of far
northeast Porter County which will lead to slippery conditions and
reduced visibilities.

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

.DAYS TWO THROUGH SEVEN...Saturday through Thursday.

Saturday...
Elevated Excessive Cold Risk.
Elevated Snow Risk late in the afternoon and at night.
Sunday...
Limited Excessive Cold Risk.
Elevated Snow Risk.
Monday...
Elevated Excessive Cold Risk in the morning.
Tuesday and Wednesday...
Limited Excessive Cold Risk.

DISCUSSION...

Bitterly cold conditions will continue through Saturday.

Accumulating snow is likely late Saturday into Sunday,
especially southeast of a Peru to Waukegan line. Several inches
of fluffy snow will likely lead to hazardous travel conditions.

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

.SPOTTER INFORMATION STATEMENT...

Spotter activation will not be necessary through tonight.

$$

LMZ740>745-241115-
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-
502 AM CST Fri Jan 23 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.

Weather hazards expected...

Gale force winds and very hazardous waves for parts of the
Indiana nearshore.
Significant Freezing Spray Risk for parts of the Indiana
nearshore.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday.

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

$$

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

789
ACUS02 KWNS 230637
SWODY2
SPC AC 230636

Day 2 Convective Outlook
NWS Storm Prediction Center Norman OK
1236 AM CST Fri Jan 23 2026

Valid 241200Z - 251200Z

...NO SEVERE THUNDERSTORM AREAS FORECAST...

...SUMMARY...
Severe thunderstorms are not anticipated across the U.S. Saturday
through Saturday night.

...Synopsis...
The mid-level pattern over the CONUS is forecast to amplify
significantly this weekend as initially split flow consolidates
behind a departing East Coast upper trough. Several short wave
perturbations (over the Southwest, northern Mexico, and southern
Canada) will gradually consolidate into larger-scale mid-level
troughing across the Rockies and Great Plains by late Saturday
night.

As upper troughing becomes established, a strong Arctic cold front
will rapidly move south with high pressure (1045+ mb) building in
its wake. An extensive cold intrusion will occur with significant
latitudinal suppression of lee cyclogenesis to far northern Mex and
the southern Gulf Coast. This will greatly limit inland moisture
return. Still, strong lift in the form of isentropic ascent over top
the front will support widespread winter precipitation (some
possibly with isolated lightning) over the Plains and south-central
US much of Saturday.

...South Texas Coast...
As the strong Arctic high pressure building over the southern Plains
forces the cold front to surge south, the Arctic air mass will
rapidly undercut the a remnant warm sector over parts of Far South
TX. Strong isentropic ascent over the shallow surface front will
allow for modest elevated destabilization. However, poor mid-level
lapse rates (6-6.5 C/km) and the overnight arrival of the more
consolidated upper ascent should preclude the development of larger
buoyancy. Thus, while a stronger storm is briefly possible along the
immediate coast or elevated behind the front, the overall severe
risk appears quite limited.

..Lyons.. 01/23/2026

$$

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

527
ACUS03 KWNS 230831
SWODY3
SPC AC 230830

Day 3 Convective Outlook
NWS Storm Prediction Center Norman OK
0230 AM CST Fri Jan 23 2026

Valid 251200Z - 261200Z

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

...SUMMARY...
Isolated strong to severe storms are possible over portions of the
central and eastern Gulf Coast Sunday.

...Synopsis...
Intensifying mid-level troughing over the central US will continue
to amplify as it moves eastward Sunday. Strong cyclonic flow aloft
will overspread portions of the southern US as a second embedded
perturbation skirts the central and eastern Gulf Coast before being
consolidated into the broader upper trough. Ascent from this
shortwave will allow a weak surface low to develop and shift
east/northeastward over the Tennessee Valley before moving offshore
of the Carolina coast early Monday. Attendant to the low, a strong
arctic cold front will sweep eastward across the southern CONUS.
Modified Gulf moisture will be in place, supporting weak instability
and some potential for strong to severe storms.

...Gulf Coast...
As the surface low moves onshore and deepens ahead of the advancing
shortwave early Sunday, inland moisture advection (60s F surface
dewpoints) is expected to increase over southeastern LA into
southern MS/AL and the western FL Panhandle in the wake of a surface
warm front lifting northward. Ongoing elevated convection near the
advancing cold front will likely encounter a warming/moistening
boundary layer sufficient for some intensification through the day
across south-central AL into the FL panhandle and southwestern GA.

Increasing southwesterly flow aloft (EBWD of 50-60 kt) will be
favorable for some storm organization amidst weak buoyancy (MLCAPE ~
500 J/kg). A broken band of storms along the cold front may pose a
risk for isolated damaging gusts and brief tornado where the
boundary layer can destabilize sufficiently inland south of the
prominent cold air intrusion/damming and ongoing winter weather. The
cold front will then continue offshore overnight with the severe
risk diminishing as a much colder air mass envelops the eastern
CONUS.

..Lyons.. 01/23/2026

$$

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

No active Winter Weather Statement for DuPage County.

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

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482
WWUS73 KLOT 230901
NPWLOT

URGENT - WEATHER MESSAGE
National Weather Service Chicago IL
301 AM CST Fri Jan 23 2026

ILZ003>006-008-010>013-019>021-023-032-103-105>108-231915-
/O.CON.KLOT.EC.W.0001.000000T0000Z-260123T1800Z/
/O.CON.KLOT.CW.Y.0002.260123T1800Z-260124T1500Z/
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 Kankakee, Wheaton, Mendota, Dwight,
Oregon, Palatine, Belvidere, Sycamore, Bolingbrook, Manhattan,
Evanston, Ottawa, Bourbonnais, Pontiac, Buffalo Grove,
Naperville, McHenry, Plano, Fairbury, Wilmington, Schaumburg,
Aurora, Mundelein, Mokena, Peotone, Plainfield, Des Plaines,
Yorkville, Gurnee, Bradley, Byron, Carol Stream, Morris, Crete,
Coal City, Beecher, Rockford, Downers Grove, Minooka, Rochelle,
Lemont, Streator, Calumet City, Orland Park, Joliet, Lombard, Oak
Forest, Marseilles, Dixon, Algonquin, Northbrook, DeKalb,
Waukegan, La Salle, Park Forest, Oswego, Elgin, Channahon,
Woodstock, and Crystal Lake
301 AM CST Fri Jan 23 2026

...EXTREME COLD WARNING REMAINS IN EFFECT UNTIL NOON CST TODAY...
...COLD WEATHER ADVISORY REMAINS IN EFFECT FROM NOON TODAY TO 9 AM
CST SATURDAY...

* WHAT...For the Extreme Cold Warning, dangerously cold wind chills
of 30 to 40 below zero expected. For the Cold Weather Advisory,
bitterly cold wind chills of 15 to 30 below zero expected.

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

* WHEN...For the Extreme Cold Warning, until noon CST today. For the
Cold Weather Advisory, from noon today to 9 AM CST Saturday.

* IMPACTS...The dangerously cold wind chills could cause frostbite
on exposed skin in as few as 10 minutes.

* ADDITIONAL DETAILS...Coldest wind chills are expected across
interior portions of northern Illinois.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Limit time outdoors. If you must go outdoors, dress in multiple
layers including a hat, face mask, and gloves.

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

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

Keep pets indoors as much as possible.

Ensure portable heaters are used correctly. Do not use generators or
grills inside.

&&

$$

ILZ104-231915-
/O.CON.KLOT.EC.W.0001.000000T0000Z-260123T1800Z/
/O.CON.KLOT.CW.Y.0002.260123T1800Z-260124T1500Z/
Central Cook-
Including the cities of Chicago, Cicero, La Grange, Oak Lawn, and
Oak Park
301 AM CST Fri Jan 23 2026

...EXTREME COLD WARNING REMAINS IN EFFECT UNTIL NOON CST TODAY...
...COLD WEATHER ADVISORY REMAINS IN EFFECT FROM NOON TODAY TO 9 AM
CST SATURDAY...

* WHAT...For the Extreme Cold Warning, dangerously cold wind chills
of 30 to 35 below zero expected. For the Cold Weather Advisory,
bitterly cold wind chills of 15 to 30 below zero expected.

* WHERE...Central Cook County.

* WHEN...For the Extreme Cold Warning, until noon CST today. For the
Cold Weather Advisory, from noon today to 9 AM CST Saturday.

* IMPACTS...The dangerously cold wind chills could cause frostbite
on exposed skin in as few as 10 minutes.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Limit time outdoors. If you must go outdoors, dress in multiple
layers including a hat, face mask, and gloves.

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

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

Keep pets indoors as much as possible.

Ensure portable heaters are used correctly. Do not use generators or
grills inside.

&&

$$

ILZ033-039-INZ001-002-010-011-019-231915-
/O.CON.KLOT.CW.Y.0002.000000T0000Z-260124T1500Z/
Iroquois-Ford-Lake IN-Porter-Newton-Jasper-Benton-
Including the cities of Morocco, Gary, Gibson City, Gilman,
Valparaiso, Roselawn, Watseka, Portage, Rensselaer, Kentland,
Hammond, Paxton, Fowler, Oxford, Merrillville, Chesterton, and
DeMotte
301 AM CST Fri Jan 23 2026 /401 AM EST Fri Jan 23 2026/

...COLD WEATHER ADVISORY REMAINS IN EFFECT UNTIL 9 AM CST /10 AM
EST/ SATURDAY...

* WHAT...Bitterly cold wind chills of 15 to 30 below zero expected.

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

* WHEN...Until 9 AM CST /10 AM EST/ Saturday.

* IMPACTS...The dangerously cold wind chills could cause frostbite
on exposed skin in as few as 10 to 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.

&&

$$

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.