SPC Convective Outlook Day 1

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333
ACUS01 KWNS 290050
SWODY1
SPC AC 290049

Day 1 Convective Outlook
NWS Storm Prediction Center Norman OK
0649 PM CST Fri Nov 28 2025

Valid 290100Z - 291200Z

...NO SEVERE THUNDERSTORM AREAS FORECAST...

...SUMMARY...
Severe thunderstorms are not anticipated tonight.

...Synopsis...
Evening water-vapor imagery shows a weak shortwave trough over the
Plains moving eastward ahead of a second, more intense, upper trough
over the central and northern Rockies. As the primary trough
intensifies to the west, the increases in west/southwesterly
midlevel flow will help deep a surface low moving from eastern
CO/western KS into OK tonight. The southerly winds will allow modest
northward moisture return tonight across parts of the southern
Plains and Ozarks.

As the surface low strengthens with the approach of the western
trough this evening and overnight, low-level warm advection should
also intensify. Strong isentropic ascent atop the cool and
relatively dry boundary-layer over the southern Plains should
support increasing coverage of showers and elevated thunderstorms
already ongoing from central and western North TX into OK and
eventually the lower MO Valley/Ozarks. With meager buoyancy aloft
(MUCAPE 500 J/kg or less) the potential for stronger updrafts
appears quite limited despite increasingly robust deep-layer shear
profiles. While a stronger storm or two with the potential for small
hail cannot be completely ruled out, severe potential remains very
low.

..Lyons.. 11/29/2025

$$

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

740
FLUS43 KLOT 290416
HWOLOT

Hazardous Weather Outlook
National Weather Service Chicago/Romeoville IL
1016 PM CST Fri Nov 28 2025

ILZ003>006-008-010>013-019>021-023-032-033-039-103>108-INZ001-002-
010-011-019-300430-
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-
1016 PM CST Fri Nov 28 2025 /1116 PM EST Fri Nov 28 2025/

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 Late Tonight.

DISCUSSION...

Snow moving into the area late tonight will result in some snow
accumulations and slippery travel by sunrise Saturday in areas
west of Interstate 55 and the Fox River Valley.

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

Saturday...
Significant Snow Risk.
Monday night...
Limited Snow Risk.

DISCUSSION...

Travel impacts from several inches of accumulating snow are
expected area-wide Saturday and Saturday night. The highest
snowfall rates will occur Saturday afternoon and early evening.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will not be necessary through tonight.

$$

LMZ740>745-300430-
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-
1016 PM CST Fri Nov 28 2025

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...

No hazardous weather is expected at this time.

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

Saturday and Sunday...
Hazardous conditions for small craft are likely.
Wednesday and 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

560
ACUS02 KWNS 281730
SWODY2
SPC AC 281728

Day 2 Convective Outlook
NWS Storm Prediction Center Norman OK
1128 AM CST Fri Nov 28 2025

Valid 291200Z - 301200Z

...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS OVER MUCH OF
EASTERN TEXAS INTO WESTERN LOUISIANA...

...SUMMARY...
Isolated severe thunderstorms are possible across portions of
southeast Texas into western Louisiana Saturday afternoon and
evening.

...Synopsis...
A shortwave trough will move from the central Plains into the Ohio
Valley and upper Great Lakes on Saturday, with a midlevel speed max
strengthening as it expands northeastward from KS to NY. East of
this system, upper ridging will occur over the East as a trough
moves out of the Maritimes.

At the surface, low pressure will move from OK/KS into northern IL
by 00Z, with a cold front trailing southwest across southern MO,
western AR, and northern TX by that time. A large area of high
pressure will remain over much of the eastern CONUS, with a surface
ridge extending into the northern Gulf for much of the day. As such,
low-level moisture return will be limited from the western Gulf into
TX, with low to mid 60s F dewpoints spreading northward ahead of the
cold front. Southwesterly 850 mb winds to around 50 kt will aid
elevated moisture advection across eastern TX/LA, while the stronger
surface-based instability stays generally west of the Sabine River.

...Eastern TX into western LA...
Modest heating is forecast over central TX ahead of the cold front
during the afternoon, though much of eastern TX into LA will remain
cool at the surface. Coincident with peak heating, thunderstorms are
likely to develop as the cold front intercepts the moist plume over
northern TX around 21Z. While profiles aloft will be cool, lapse
rates will not be particularly steep. With MLCAPE perhaps up to 1000
J/kg within the theta-e plume, and effective shear of 30-40 kt,
marginal hail cannot be ruled out. Locally strong gusts may also
accompany the storms as the cold front surges south.

Farther south, additional activity may develop ahead of the cold
front over southeast TX as moisture increases. Low-level wind fields
will be weak overall, but veering with height. As such, a weak/brief
tornado cannot be ruled out. Otherwise, a line of storms will push
south along with the surging cold front, with marginal hail or
locally gusty winds. Severe risk into LA is less certain, as the
surface air mass remains cool with elevated instability. SBCAPE may
develop into southwest LA late in the period, supporting low severe
probabilities.

..Jewell.. 11/28/2025

$$

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

477
ACUS03 KWNS 281911
SWODY3
SPC AC 281910

Day 3 Convective Outlook
NWS Storm Prediction Center Norman OK
0110 PM CST Fri Nov 28 2025

Valid 301200Z - 011200Z

...NO SEVERE THUNDERSTORM AREAS FORECAST...

...SUMMARY...
A few thunderstorms are possible along the Gulf Coast. Severe
thunderstorms are not expected.

...Synopsis...
A large upper trough will extend from Hudson Bay southward into the
Great Lakes region on Sunday, and will pivot across the Northeast
through early Monday. West of this trough, another strong trough
will dive southeastward across the Great Basin and Rockies. For the
southern Plains into the Southeast, moderate westerly winds aloft
will persist with nearly zonal flow.

At the surface, a large area of high pressure will extend from MT
into the Plains early Sunday, settling across the Midwest/mid MS and
OH Valleys into Monday morning. Given the cool air mass over most of
the CONUS, thunderstorms chances will be limited to the immediate
Gulf Coast where the cold front will undercut residual moisture.

Given minimal elevated instability and lift, any convection is
expected to remain non-severe.

..Jewell.. 11/28/2025

$$

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

445
WWUS43 KLOT 290349
WSWLOT

URGENT - WINTER WEATHER MESSAGE
National Weather Service Chicago IL
949 PM CST Fri Nov 28 2025

ILZ003>006-008-010>013-019>021-023-032-103>108-INZ001-002-291400-
/O.CON.KLOT.WS.W.0002.251129T0900Z-251130T1200Z/
Winnebago-Boone-McHenry-Lake IL-Ogle-Lee-De Kalb-Kane-DuPage-La
Salle-Kendall-Grundy-Kankakee-Livingston-Northern Cook-Central
Cook-Southern Cook-Northern Will-Southern Will-Eastern Will-Lake
IN-Porter-
Including the cities of Woodstock, Gary, Lemont, Gurnee, Aurora,
Elgin, Morris, Wilmington, Plano, Oregon, Marseilles, DeKalb,
Mundelein, Coal City, Oak Lawn, Crete, Rochelle, Ottawa,
Merrillville, Minooka, Beecher, Algonquin, Dixon, Peotone,
Valparaiso, Cicero, Bourbonnais, Streator, Fairbury, Belvidere,
Bradley, Carol Stream, Crystal Lake, Buffalo Grove, Pontiac,
Bolingbrook, Manhattan, Downers Grove, Hammond, Byron, Dwight,
Orland Park, Naperville, Portage, Waukegan, Channahon, Wheaton,
Kankakee, Rockford, La Salle, Des Plaines, Plainfield, Mendota,
Sycamore, Oak Forest, Yorkville, La Grange, Park Forest, Oak
Park, Calumet City, Joliet, Chesterton, Palatine, Oswego,
Northbrook, Chicago, Mokena, Evanston, Schaumburg, McHenry, and
Lombard
949 PM CST Fri Nov 28 2025

...WINTER STORM WARNING REMAINS IN EFFECT FROM 3 AM SATURDAY TO 6 AM
CST SUNDAY...

* WHAT...Heavy snow expected. Total snow accumulations between 6 and
10 inches. Locally higher amounts possible northwest of an Ottawa
to Aurora to Waukegan line. Southeast winds gusting to 30 mph.

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

* WHEN...From 3 AM Saturday to 6 AM CST Sunday.

* IMPACTS...Travel could be very difficult.

* ADDITIONAL DETAILS...The highest snowfall rates are expected
Saturday afternoon, with some blowing and drifting snow possible.
The snow may mix with or transition to drizzle east of Interstate
55 Saturday evening.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If you must travel, keep an extra flashlight, food, and water in
your vehicle in case of an emergency. The latest road conditions for
Illinois can be obtained at www.gettingaroundillinois.com. The
latest road conditions for Indiana can be obtained at
https://511in.org.

&&

$$

ILZ033-039-INZ010-011-019-291400-
/O.CON.KLOT.WS.W.0002.251129T0900Z-251130T0600Z/
Iroquois-Ford-Newton-Jasper-Benton-
Including the cities of Morocco, Kentland, Paxton, Gibson City,
DeMotte, Roselawn, Oxford, Rensselaer, Gilman, Watseka, and
Fowler
949 PM CST Fri Nov 28 2025 /1049 PM EST Fri Nov 28 2025/

...WINTER STORM WARNING REMAINS IN EFFECT FROM 3 AM CST /4 AM EST/
SATURDAY TO MIDNIGHT CST /1 AM EST/ SATURDAY NIGHT...

* WHAT...Heavy snow expected. Total snow accumulations between 5 and
9 inches. Southeast winds gusting as high as 30 mph.

* WHERE...In Illinois, Ford and Iroquois Counties. In Indiana,
Benton, Jasper, and Newton Counties.

* WHEN...From 3 AM CST /4 AM EST/ Saturday to midnight CST /1 AM
EST/ Saturday Night.

* IMPACTS...Travel could be very difficult.

* ADDITIONAL DETAILS...The highest snowfall rates are expected
Saturday afternoon, with some blowing and drifting snow possible.
The snow will likely transition to drizzle Saturday evening.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If you must travel, keep an extra flashlight, food, and water in
your vehicle in case of an emergency. The latest road conditions for
Illinois can be obtained at www.gettingaroundillinois.com. The
latest road conditions for Indiana can be obtained at
https://511in.org.

&&

$$

Ogorek

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.

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.