SPC Convective Outlook Day 1

See Product Description

080
ACUS01 KWNS 240038
SWODY1
SPC AC 240037

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

Valid 240100Z - 241200Z

...NO SEVERE THUNDERSTORM AREAS FORECAST...

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

...01z Update...

Broad warm advection regime has established itself across the
southern Plains into far west TX. Latest surface data suggests the
polar front has surged to a position from northwest of CLL-ATT-OZA.
This boundary will advance into the lower Rio Grande Valley region
later tonight. Earlier thoughts continue regarding the potential for
elevated convection atop the cooler air mass. Model guidance
continues to suggest some risk for surface-based convection near the
front later tonight. However, low-level convergence is not
particularly noteworthy and updraft strength with this activity is
expected to remain weak.

..Darrow.. 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

461
FLUS43 KLOT 232110
HWOLOT

Hazardous Weather Outlook
National Weather Service Chicago/Romeoville IL
310 PM CST Fri Jan 23 2026

ILZ003>006-008-010>013-019>021-023-032-033-039-103>108-INZ001-002-
010-011-019-242115-
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-
310 PM CST Fri Jan 23 2026 /410 PM EST Fri Jan 23 2026/

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

.DAY ONE...Tonight.

Weather hazards expected...

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

DISCUSSION...

Dangerously cold weather will persist through Saturday morning,
with wind chills ranging from 20 to 30 below. The coldest
conditions will occur north and west of I-55.

Lake effect snow showers will persist across parts of far
northeast Porter County tonight, which will produce 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 in the morning.
Elevated Snow Risk afternoon and night.
Sunday...
Limited Excessive Cold Risk.
Elevated Snow Risk.
Sunday night and Monday...
Elevated Excessive Cold Risk.
Tuesday...
Limited Excessive Cold Risk.
Wednesday...
Limited Excessive Cold Risk.
Limited Snow Risk.
Thursday...
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 Illinois 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>745-242115-
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-
310 PM 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...Tonight.

Weather hazards expected...

Hazardous conditions for small craft Indiana shore.
Significant Freezing Spray Risk this evening Indiana shore.

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

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

$$

Ratzer

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

093
ACUS02 KWNS 231700
SWODY2
SPC AC 231659

Day 2 Convective Outlook
NWS Storm Prediction Center Norman OK
1059 AM CST Fri Jan 23 2026

Valid 241200Z - 251200Z

...NO SEVERE THUNDERSTORM AREAS FORECAST...

...SUMMARY...
The risk for severe thunderstorms appears negligible across the U.S.
Saturday through Saturday night.

...Discussion...
Downstream of amplified split flow across the Pacific into western
North America, it still appears that several short wave troughs will
gradually consolidate into larger-scale mid-level troughing across
the Rockies and Great Plains into Mississippi Valley through this
period. This is likely to include at least a couple of merging
perturbations of Canadian Arctic origin digging across the
international border through the northern U.S. Rockies and Great
Plains, and another emerging from the northern mid-latitude Pacific
before digging inland across the Pacific Northwest coast through the
southern Great Basin. Yet another impulse, emerging from the
southern mid-latitude eastern Pacific, and currently in the form of
a mid-level low as it digs toward Baja, is forecast to undergo
considerable deformation while being forced eastward, then
northeastward, across the northern Mexican Plateau into the southern
Great Plains by late Saturday night.

This is being preceded by the southeastward development of an
expansive cold surface ridge across much of the nation to the east
of the Rockies, as far south as the Gulf coast vicinity. While
highest surface pressures centered across the Upper Midwest, Ohio
Valley and Great Lakes at the outset of the period are forecast to
continue to fall while shifting northeastward, it appears that the
residual Arctic air mass will impede significant inland surface
cyclogenesis.

Models do still indicate modest deepening of surface troughing in
one corridor across the lower Mississippi Valley toward the lower
Ohio Valley (as well as in another near/offshore of the Carolina
coast) by late Saturday through Saturday night. Elevated moisture
return above the cold air to the north and northwest of this feature
appears likely to be accompanied by weak destabilization. However,
appreciable boundary-layer destabilization along the surface trough
axis, inland across southeastern Louisiana through southeastern/east
central Mississippi and adjacent western Alabama by 12Z Sunday,
appears unlikely. This is expected to minimize the risk for severe
weather.

...Southern Great Plains/Lower Mississippi Valley...
Convection allowing output and other guidance suggest that the most
substantive potential for thunderstorm development will largely
focus just to the cool side of the surface frontal zone, near/inland
of mid/upper Texas Gulf coastal areas through Louisiana and
central/southwestern Mississippi Saturday through Saturday night..
Layers of developing weak conditional and convective instability
further aloft, and to the west through north, might become
supportive of convective development capable of producing lightning,
anywhere from the Texas South Plains and Big Country into the Mid
South. The extent of this potential remains a bit unclear due to
spread evident in the model output. However, further adjustments to
the 10 percent thunder line may be needed in subsequent outlooks for
this period.

..Kerr.. 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

426
ACUS03 KWNS 231917
SWODY3
SPC AC 231916

Day 3 Convective Outlook
NWS Storm Prediction Center Norman OK
0116 PM CST Fri Jan 23 2026

Valid 251200Z - 261200Z

...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS SUNDAY INTO
SUNDAY NIGHT ACROSS PARTS OF SOUTHEASTERN LOUISIANA...SOUTHEASTERN
MISSISSIPPI,...SOUTHEASTERN ALABAMA...SOUTHERN GEORGIA AND THE
FLORIDA PANHANDLE...

...SUMMARY...
Strong thunderstorm development appears possible across parts of the
eastern Gulf Coast states Sunday into Sunday night, accompanied by
some risk for severe weather.

...Discussion...
Within a broadly confluent regime across and east of the Rockies,
models suggest that positively tilted larger-scale mid-level
troughing may continue to consolidate while progressing across and
east of the Mississippi Valley during this period, downstream of
broad mid-level ridging within split flow developing inland of the
Pacific coast into Intermountain West. In its wake, it appears that
another notable cold surface ridge will build south-southeastward to
the lee of the Rockies, through much of the Great Plains and
Mississippi Valley by late Sunday night. Ahead of it, models
indicate that the remnants of a preceding Arctic intrusion will
undergo more substantive modification, but, coupled with weak inland
upper forcing, probably not enough to support significant frontal
surface cyclogenesis across the Allegheny Plateau or Southeast.

...Eastern Gulf Coast states...
Guidance currently suggests that low-level thermal and moisture
advection, supportive of weak boundary-layer destabilization, may be
confined to a narrow inland spreading corridor across southeastern
Louisiana through portions of southern/eastern Alabama and adjacent
Georgia during the day Sunday, before being undercut/cut off by a
developing cold front. It appears that this will coincide with, but
generally trail to the southwest of, a modest to weak developing
frontal wave across the Piedmont of Alabama into Georgia.

Strong deep-layer southwesterly flow overspreading the destabilizing
environment will probably still contribute to shear potentially
conducive to organized convective development. This may include
sizable clockwise-curved low-level hodographs within the pre-cold
frontal warm advection regime. However, forecast soundings suggest
that these low-level hodographs will trend more linear, as the
initially stable boundary-layer destabilizes. So the risk for
tornadoes seems rather limited, but there may be a window for an
evolving line of storms with potential to produce strong surface
wind gusts, particularly across parts of southeastern Alabama and
the Florida Panhandle into southwestern Georgia late Sunday
afternoon and evening.

..Kerr.. 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

See Product Description

248
WWUS73 KLOT 240312
NPWLOT

URGENT - WEATHER MESSAGE
National Weather Service Chicago IL
912 PM CST Fri Jan 23 2026

ILZ003>006-008-010>013-019>021-023-032-103-105>108-241315-
/O.CON.KLOT.CW.Y.0002.000000T0000Z-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 Sycamore, Joliet, Morris, Plano,
Waukegan, Algonquin, Pontiac, Elgin, Mendota, Oak Forest,
Channahon, Manhattan, Gurnee, Kankakee, DeKalb, Belvidere,
Buffalo Grove, Mundelein, Marseilles, Bourbonnais, Mokena, Dixon,
McHenry, Bradley, Beecher, Calumet City, Downers Grove, Orland
Park, Evanston, Wilmington, Crete, Minooka, Coal City, Oregon, La
Salle, Palatine, Des Plaines, Streator, Wheaton, Fairbury,
Aurora, Dwight, Northbrook, Crystal Lake, Oswego, Plainfield,
Schaumburg, Byron, Yorkville, Rochelle, Bolingbrook, Woodstock,
Lombard, Park Forest, Lemont, Naperville, Rockford, Ottawa,
Peotone, and Carol Stream
912 PM CST Fri Jan 23 2026

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

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

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

* WHEN...Until 9 AM CST Saturday.

* 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-INZ001-002-010-011-019-241315-
/O.CON.KLOT.CW.Y.0002.000000T0000Z-260124T1500Z/
Iroquois-Ford-Lake IN-Porter-Newton-Jasper-Benton-
Including the cities of Gibson City, Paxton, Hammond, Valparaiso,
Rensselaer, Morocco, DeMotte, Chesterton, Gilman, Kentland,
Fowler, Oxford, Roselawn, Merrillville, Gary, Portage, and
Watseka
912 PM CST Fri Jan 23 2026 /1012 PM EST Fri Jan 23 2026/

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

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

* 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 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.

&&

$$

ILZ104-241315-
/O.CON.KLOT.CW.Y.0002.000000T0000Z-260124T1500Z/
Central Cook-
Including the cities of Oak Lawn, Cicero, La Grange, Chicago, and
Oak Park
912 PM CST Fri Jan 23 2026

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

* WHAT...Very cold wind chills as low as 15 to 30 below expected.

* WHERE...Central Cook County.

* WHEN...Until 9 AM CST Saturday.

* 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.

&&

$$

Birk

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.