SPC Convective Outlook Day 1

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732
ACUS01 KWNS 130031
SWODY1
SPC AC 130030

Day 1 Convective Outlook
NWS Storm Prediction Center Norman OK
0630 PM CST Mon Jan 12 2026

Valid 130100Z - 131200Z

...NO THUNDERSTORM AREAS FORECAST...

...SUMMARY...
Thunderstorms are not expected the remainder of tonight.

...Synopsis...

Expansive surface high pressure and a dry/stable boundary layer will
preclude thunderstorm activity tonight.

..Leitman.. 01/13/2026

$$

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

653
FLUS43 KLOT 122108
HWOLOT

Hazardous Weather Outlook
National Weather Service Chicago/Romeoville IL
308 PM CST Mon Jan 12 2026

ILZ003>006-008-010>013-019>021-023-032-033-039-103>108-INZ001-002-
010-011-019-132115-
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-
308 PM CST Mon Jan 12 2026 /408 PM EST Mon Jan 12 2026/

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

.DAY ONE...Tonight.

No hazardous weather is expected at this time.

.DAYS TWO THROUGH SEVEN...Tuesday through Sunday.

Wednesday afternoon through Thursday morning...
Elevated Snow Risk northeastern Porter County.
Moderate Lakeshore Flood Risk Indiana shore.
Thursday night through Sunday...
Limited Snow Risk at times.
Sunday...
Limited Excessive Cold Risk.

DISCUSSION...

Wind driven accumulating lake effect snow is possible across
northeastern Porter County late Wednesday, Wednesday night, and
possibly lingering into Thursday morning. It is still too early to
determine if and for how long the potentially heavier lake effect
snow will impact Porter County versus remaining east of Porter
County.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will not be necessary through tonight.

$$

LMZ740>745-132115-
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-
308 PM CST Mon Jan 12 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.

.DAYS TWO THROUGH SEVEN...Tuesday through Sunday.

Tuesday...
Hazardous conditions for small craft are likely.
Wednesday and Wednesday night...
Gale force winds and very hazardous waves likely.
Significant Freezing Spray Risk.
Thursday...
Hazardous conditions for small craft are likely.
Significant Freezing Spray Risk.
Friday through Sunday...
Hazardous conditions for small craft are likely.

$$

- Izzi

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

299
ACUS02 KWNS 121653
SWODY2
SPC AC 121651

Day 2 Convective Outlook
NWS Storm Prediction Center Norman OK
1051 AM CST Mon Jan 12 2026

Valid 131200Z - 141200Z

...NO SEVERE THUNDERSTORM AREAS FORECAST...

...SUMMARY...
Severe thunderstorms are not expected on Tuesday.

...Synopsis...
A large-scale upper trough is forecast to amplify across the
central/eastern CONUS on Tuesday. Within the large-scale trough,
multiple embedded shortwaves will move across parts of the northern
Plains and Midwest/Great Lakes, while a weak upper low initially
over southwest TX will eject eastward as a shortwave trough. A
surface low is forecast to move across parts of Ontario and southern
Quebec. A weak cold front will move across parts of the central
Plains into the Ohio Valley, while a stronger reinforcing front will
move across the northern Plains into the Upper Midwest/Great Lakes
late in the period.

Moisture return within the warm sector of the primary cyclone is
expected to remain too meager for any appreciable destabilization
and thunderstorm threat. One area where thunderstorm development
cannot be ruled out is across far southeast FL and the Keys, where
some low-level moistening beneath cooling midlevel temperatures may
support MUCAPE of around 500-1000 J/kg. Generally weak large-scale
ascent and a warm layer around 700 mb are expected to limit
thunderstorm coverage, but a storm or two may develop, especially
near or just offshore of the southeast FL coast, within a low-level
convergence zone.

..Dean.. 01/12/2026

$$

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

657
ACUS03 KWNS 121911
SWODY3
SPC AC 121910

Day 3 Convective Outlook
NWS Storm Prediction Center Norman OK
0110 PM CST Mon Jan 12 2026

Valid 141200Z - 151200Z

...NO THUNDERSTORM AREAS FORECAST...

...SUMMARY...
Thunderstorm potential appears low on Wednesday.

...Synopsis...
A deep upper trough will remain in place across the central/eastern
CONUS on Wednesday. Within the large-scale trough, embedded
shortwave troughs will move through parts of the Midwest/Great
Lakes, central Gulf Coast/Southeast, and the Florida Peninsula. A
surface low initially over Quebec will move quickly northeastward,
with new surface low development expected near southern New England
later in the period, and frontal wave development possible offshore
of the Atlantic Seaboard. A reinforcing cold front will move through
much of the central/eastern CONUS through the period.

With the exception of south FL, prefrontal moisture return is
expected to be too meager for appreciable destabilization. Across
south FL, weak buoyancy may be in place Wednesday morning, but most
guidance suggests that thunderstorm potential will largely be
offshore by the start of the period (12Z Wednesday morning). Late in
the period, weak convection associated with the approaching
shortwave trough and cold front may affect parts of the FL
Peninsula, but forecast buoyancy by late Wednesday night/early
Thursday morning appears too weak/shallow for appreciable
thunderstorm potential.

..Dean.. 01/12/2026

$$

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

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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

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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

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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

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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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No active Non-Precip Statement for DuPage County.

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.

Winter Weather Warnings

No active Winter Weather 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.