SPC Convective Outlook Day 1

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478
ACUS01 KWNS 260536
SWODY1
SPC AC 260534

Day 1 Convective Outlook
NWS Storm Prediction Center Norman OK
1134 PM CST Wed Feb 25 2026

Valid 261200Z - 271200Z

...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS ACROSS PORTIONS
OF NORTHERN MISSISSIPPI AND NORTHERN ALABAMA...

...SUMMARY...
Isolated-scattered thunderstorms are expected across portions of the
Gulf states into the Southeast. A few storms may produce hail across
portions of northern Mississippi into northern Alabama.

...Gulf States...

Water-vapor imagery depicts a well-defined short-wave trough digging
southeast across the central Plains. 500mb speed max associated with
this feature is forecast to translate across northern AR into the
Mid South by 18z before the short wave deamplifies as it approaches
the southern Appalachians. In response to this short wave, LLJ will
strengthen across GA into NC before advancing off the Middle
Atlantic coast by early evening. While low-level flow will weaken
considerably across the northern Gulf states, weak convergence is
expected to aid convective development along the trailing synoptic
front as it settles south during the afternoon. Latest model
guidance suggests modest boundary-layer heating will be noted across
the lower MS Valley into northern AL by mid afternoon such that
minimal inhibition will be present along the wind shift. Forecast
soundings exhibit MLCAPE on the order of 1000 J/kg as surface
temperatures rise through the upper 60s into the lower 70s. HREF
guidance supports this with isolated-scattered convection evolving
along the trailing boundary by 21z, especially the HRRR. Hail is the
primary concern with these storms through early evening.

..Darrow/Chalmers.. 02/26/2026

$$

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

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646
FLUS43 KLOT 260228 AAA
HWOLOT

Hazardous Weather Outlook...UPDATED
National Weather Service Chicago/Romeoville IL
828 PM CST Wed Feb 25 2026

ILZ003>006-008-010>013-019>021-023-032-033-039-103>108-INZ001-002-
010-011-019-270230-
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-
828 PM CST Wed Feb 25 2026 /928 PM EST Wed Feb 25 2026/

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

.DAY ONE...Tonight.

Weather hazards expected...

Limited Snow Risk south of a La Salle to Rensselaer line.

DISCUSSION...

A brief burst of snow may develop tonight south of a La Salle to
Rensselaer line leading to locally slippery travel conditions.
Any snow threat will end by about 3 to 4 AM.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday.

Saturday...
Limited Snow Risk.
Sunday night and through Tuesday...
Limited Snow Risk.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will not be necessary through tonight.


.SPOTTER INFORMATION STATEMENT...

Spotter activation will not be necessary through tonight.

$$

LMZ740>745-270230-
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-
828 PM CST Wed Feb 25 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.

No hazardous weather is expected at this time.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday.

Friday through Tuesday...
Hazardous conditions for small craft are likely.

$$

Carlaw

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

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206
ACUS02 KWNS 260651
SWODY2
SPC AC 260650

Day 2 Convective Outlook
NWS Storm Prediction Center Norman OK
1250 AM CST Thu Feb 26 2026

Valid 271200Z - 281200Z

...NO SEVERE THUNDERSTORM AREAS FORECAST...

...SUMMARY...
General thunderstorms are likely over parts of the Southeast on
Friday. Severe thunderstorms are not currently forecast.

... Discussion ...

A deamplifying shortwave tough is forecast to move across the
Southeast through the period, embedded within a broader regime of
mid-level toughing across the eastern US. This large-scale setup
will maintain modest ascent across the Gulf States and South
Atlantic coast. At the surface, a weak cold front will continue to
sag slowly south toward the Gulf Coast and northern Florida
Peninsula.

Ongoing precipitation and cloud cover at the start of the period
across central Alabama and Georgia are expected to persist,
gradually shifting south and east through the period. While
thermodynamic conditions support thunderstorms, the overall severe
threat should remain low due to weak low-level convergence and
limited instability.

... Southern Alabama/Georgia and the Florida Panhandle ...

Seasonably rich low-level moisture characterized by dewpoints in the
low 60Fs will be in place ahead of the sagging surface boundary.
Despite surface temperatures warming into the low 70Fs, widespread
cloud cover and ongoing precipitation will likely limit overall
diurnal heating.

Modified soundings suggest a marginally unstable environments with
MLCAPE ranging from 500-1000 J/kg. These buoyancy profiles appear
tall and skinny, which, combined with the lack of stronger forcing,
will limit the potential for robust updrafts. While hodographs are
notably elongated, suggesting deep-layer shear should be sufficient
for some storm organization, weak low-level kinematic fields and
poor low-level convergence should preclude a sustained, organized
severe threat.

... Florida Peninsula ...

South of the primary frontal zone, additional thunderstorm
development appears possible during the day on Friday across the
Florida peninsula. Forecast soundings across the peninsula indicate
the presence of a CAPE robbing capping inversion around 700 mb,
although this inversion lifts during the day in response to subtle
height falls associated with the synoptic trough. The associated
warmer mid-level temperatures associated with the capping inversion
will limit MLCAPE to between 500-1000 J/kg. Additionally, hodograph
lengths decrease with southward extent, indicative of weakening
deep-layer shear. Given this type of environment and the lack of
focused forcing, any thunderstorm should remain disorganized and
below severe limits.

..Marsh.. 02/26/2026

$$

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

219
ACUS03 KWNS 251921
SWODY3
SPC AC 251920

Day 3 Convective Outlook
NWS Storm Prediction Center Norman OK
0120 PM CST Wed Feb 25 2026

Valid 271200Z - 281200Z

...NO SEVERE THUNDERSTORM AREAS FORECAST...

...SUMMARY...
General thunderstorms are likely over parts of the Southeast on
Friday. Severe thunderstorms are not currently forecast.

...Synopsis...
A shortwave trough will move from the southern Plains toward the
northern Gulf of America on Friday, with cooling aloft overspreading
much of the Southeast. At the surface, a prominent ridge will extend
from the Mid Atlantic across the TN and into the lower MS Valley,
with a cold front roughly from SC into LA.

Near this front, rain and a few thunderstorms are likely to be
ongoing from southern LA/MS/AL/GA into northern FL Friday morning.
While clouds and precipitation may hamper heating, at least a few
hundred J/kg MLCAPE appears likely given lower 60s F dewpoints and a
plume of low-level theta-e extending out of the northern Gulf and
across the FL Panhandle/southern AL/southern GA.

Given questionable destabilization and relatively weak boundary
layer winds, potential for isolated strong/severe storms are not
currently depicted.

..Jewell.. 02/25/2026

$$

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.

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.