SPC Convective Outlook Day 1

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586
ACUS01 KWNS 030058
SWODY1
SPC AC 030056

Day 1 Convective Outlook
NWS Storm Prediction Center Norman OK
0656 PM CST Fri Jan 02 2026

Valid 030100Z - 031200Z

...NO SEVERE THUNDERSTORM AREAS FORECAST...

...SUMMARY...
No severe threat is expected across the U.S. through tonight.

...DISCUSSION...
A shortwave trough will move through the Southeast tonight. Ahead of
this feature, isolated thunderstorms may occur across parts of
Alabama, Georgia and the Florida Panhandle. Further west, a
shortwave trough will move southeastward across the southern Plains
this evening. A small cluster of thunderstorms near the trough will
likely persist for a couple more hours in the central and eastern
Texas Panhandle. In the western U.S., a few thunderstorms may
develop in California tonight ahead of a mid-level trough moving
through the eastern Pacific. No severe threat is expected across the
U.S. through daybreak on Saturday.

..Broyles.. 01/03/2026

$$

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

526
FLUS43 KLOT 022032
HWOLOT

Hazardous Weather Outlook
National Weather Service Chicago/Romeoville IL
232 PM CST Fri Jan 2 2026

ILZ003>006-008-010>013-019>021-023-032-033-039-103>108-INZ001-002-
010-011-019-032045-
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-
232 PM CST Fri Jan 2 2026 /332 PM EST Fri Jan 2 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...Saturday through Thursday.

No hazardous weather is expected at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will not be necessary through tonight.

$$

LMZ740>745-032045-
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-
232 PM CST Fri Jan 2 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.

No hazardous weather is expected at this time.

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

No hazardous weather is expected at this time.

$$

Petr

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

230
ACUS02 KWNS 021726
SWODY2
SPC AC 021725

Day 2 Convective Outlook
NWS Storm Prediction Center Norman OK
1125 AM CST Fri Jan 02 2026

Valid 031200Z - 041200Z

...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS ACROSS PORTIONS
OF THE SOUTHEAST AND PARTS OF NORTHERN CALIFORNIA AND THE OREGON
COAST...

...SUMMARY...
Isolated severe storms are possible across parts of the Southeast on
Saturday, and the Sacramento/northern San Joaquin Valleys to coastal
northern California-southwest Oregon in the afternoon/early evening.

...Southeast...
Late-morning surface observations across the TX/LA/MS region show
the early stages of moisture return ahead of a gradually deepening
surface low to the west across the southern Plains. The ejection of
a low-amplitude mid-level perturbation (noted in water-vapor imagery
over the Four Corners region as of 17 UTC) will lead to modest
strengthening and an eastward progression of the surface low into
the Southeast states through Saturday evening.

Thunderstorms will likely develop within the warm/moist advection
regime and along a weak surface trough/cold front by mid/late
afternoon across portions of AL, GA, and northern FL. A plume of low
to mid-60s dewpoints will likely become established by late
afternoon across the FL Panhandle into southern GA, and should
support MLCAPE values upwards of 1000 J/kg, though ongoing
showers/thunderstorms may modulate overall destabilization to some
degree. 50-knot mid-level flow will support adequate deep-layer
shear for organized convection, including the potential for
semi-discrete supercells before gradual upscale growth occurs
through late afternoon/evening. Some severe wind/hail and tornado
threat is expected to materialize, but uncertainty regarding the
degree of destabilization within the warm sector and storm mode
limits confidence for higher risk probabilities. This uncertainty is
reflected in 12z CAM/HREF guidance, which depicts only modest
signals for intense convection. That said, a more focused corridor
of severe risk may emerge along the FL/GA line where the convective
environment should be relatively most favorable for supercells.

...Central Valley into the CA/OR Coasts...
A strong upper trough off the West Coast is expected to move inland
over the next 24 hours. Multiple bands of showers and thunderstorms
will likely spread across northern CA and OR through peak heating
when modest low-level moisture (low 50s dewpoints) will likely
support a few hundred J/kg MLCAPE. Southerly low-level flow through
the Central Valley will maintain some low-level hodograph curvature
that may be favorable for a brief tornado or two. Additionally,
40-45 flow between the 1-3 km layer may augment downdraft winds and
support sporadic wind damage and perhaps a few severe gusts.

..Moore.. 01/02/2026

$$

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

678
ACUS03 KWNS 021925
SWODY3
SPC AC 021924

Day 3 Convective Outlook
NWS Storm Prediction Center Norman OK
0124 PM CST Fri Jan 02 2026

Valid 041200Z - 051200Z

...NO SEVERE THUNDERSTORM AREAS FORECAST...

...SUMMARY...
Severe thunderstorms are not expected on Sunday or Sunday night.

...Synopsis...
A mid-level wave traversing the eastern CONUS at the beginning of
the period will continue to shift off the East Coast through the day
Sunday. A trailing cold front pushing southward along the FL
Peninsula will likely support shallow convective showers along the
coasts, but warm mid-level temperatures coincident with dry air will
limit the potential for deep convection and lightning production.
Across the West, broad southwesterly flow will persist along the
coast and into the Great Basin. Thunderstorm potential will most
likely be confined to central CA and perhaps along the northern CA
and OR/WA coasts where cool mid-level temperatures will overspread
modest low-level moisture. Weaker low-level wind profiles compared
to D2/Saturday should limit the potential for organized convection.
Sporadic lightning flashes appear possible further inland across the
northern Great Basin given broad-scale ascent and some degree of
mid-level cooling, but the signal for appreciable MUCAPE among all
guidance is too limited to introduce additional thunder areas.

..Moore.. 01/02/2026

$$

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

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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

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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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.