SPC Convective Outlook Day 1

See Product Description

835
ACUS01 KWNS 120453
SWODY1
SPC AC 120452

Day 1 Convective Outlook
NWS Storm Prediction Center Norman OK
1052 PM CST Sun Jan 11 2026

Valid 121200Z - 131200Z

...NO THUNDERSTORM AREAS FORECAST...

...SUMMARY...
Thunderstorms are not expected today and tonight.

...Synopsis...

Surface high pressure will be in place from the Intermountain West
to the Southeast today. The expansive high pressure extending from
the southern Plains to the Southeast will maintain continental
trajectories and offshore flow, cutting off Gulf moisture. The lack
of boundary layer moisture, and cool/stable conditions will preclude
thunderstorm activity through Monday night/early Tuesday.

..Leitman.. 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.

Hazardous Weather Outlook

See Product Description

611
FLUS43 KLOT 111955
HWOLOT

Hazardous Weather Outlook
National Weather Service Chicago/Romeoville IL
155 PM CST Sun Jan 11 2026

ILZ003>006-008-010>013-019>021-023-032-033-039-103>108-INZ001-002-
010-011-019-122000-
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-
155 PM CST Sun Jan 11 2026 /255 PM EST Sun Jan 11 2026/

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

.DAY ONE...This Afternoon and Tonight.

No hazardous weather is expected at this time.

.DAYS TWO THROUGH SEVEN...Monday through Saturday.

Wednesday through Saturday...
Limited Snow Risk at times.

DISCUSSION...

Wind-whipped snow showers appear likely on Wednesday, potentially
followed by accumulating lake effect snow Wednesday night into
Thursday morning for portions of northeast and east central
Illinois and northwest Indiana. Another round of snow may occur
Friday into Saturday.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will not be necessary through tonight.

$$

LMZ740>745-122000-
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-
155 PM CST Sun Jan 11 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...This Afternoon and Tonight.

Weather hazards expected...

Hazardous conditions for small craft.

.DAYS TWO THROUGH SEVEN...Monday through Saturday.

Monday and Tuesday...
Hazardous conditions for small craft are likely.
Wednesday...
Gale force winds and very hazardous waves likely.
Elevated Freezing Spray Risk.
Thursday...
Hazardous conditions for small craft are likely.

$$

Ogorek

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

034
ACUS02 KWNS 111650
SWODY2
SPC AC 111648

Day 2 Convective Outlook
NWS Storm Prediction Center Norman OK
1048 AM CST Sun Jan 11 2026

Valid 121200Z - 131200Z

...NO THUNDERSTORM AREAS FORECAST...

...SUMMARY...
Thunderstorm potential appears low on Monday.

...Synopsis...
A mid/upper shortwave trough and attendant strong jet will move
southeastward from the Canadian Prairies towards the northern Plains
and Upper Midwest through the period. This system will be
accompanied by cooling aloft and steepening midlevel lapse rates,
but available moisture appears insufficient for appreciable
buoyancy, resulting in limited thunderstorm potential.

An upper low is forecast to move across northern Mexico and approach
southwest TX. Limited moisture is expected to result in negligible
to only very weak elevated buoyancy, and thunderstorm potential
appears low at this time.

Some low-level moistening and weak destabilization will be possible
across far south FL and the Keys, but poor lapse rates and weak
forcing are expected to hamper development of deep convection.

..Dean.. 01/11/2026

$$

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

092
ACUS03 KWNS 111852
SWODY3
SPC AC 111851

Day 3 Convective Outlook
NWS Storm Prediction Center Norman OK
1251 PM CST Sun Jan 11 2026

Valid 131200Z - 141200Z

...NO THUNDERSTORM AREAS FORECAST...

...SUMMARY...
Thunderstorm potential appears low on Tuesday.

...Synopsis...
Generally dry and stable conditions are expected to limit
thunderstorm potential across the CONUS on Tuesday. A large-scale
upper trough is forecast to amplify across the central/eastern
CONUS. An embedded shortwave trough and attendant surface low are
forecast to move across the Great Lakes vicinity, while a weak upper
low initially near southwest TX is expected to evolve into a
low-amplitude shortwave trough and move eastward across the Gulf
Coast region.

A persistent surface ridge over the Gulf will inhibit moisture
return and destabilization within the warm sector of the surface low
moving across the Great Lakes. Modest low-level moisture and weak
buoyancy may reside across parts of south FL and the Keys for much
of the period. However, weak forcing and poor lapse rates will tend
to inhibit deep convection, with any appreciable thunderstorm
potential currently expected to remain offshore.

..Dean.. 01/11/2026

$$

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

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.