SPC Convective Outlook Day 1

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263
ACUS01 KWNS 040043
SWODY1
SPC AC 040042

Day 1 Convective Outlook
NWS Storm Prediction Center Norman OK
0642 PM CST Mon Nov 03 2025

Valid 040100Z - 041200Z

...NO SEVERE THUNDERSTORM AREAS FORECAST...

...SUMMARY...
Organized severe storms are not expected tonight.

...Synopsis...
A pronounced mid-level trough and accompanying 110+ kt 500 mb jet
max will continue to rapidly progress over the Northeast through
tonight. Cooler temperatures above the boundary layer are
contributing to near 8 C/km low- to mid-level lapse rates, resulting
in marginal (but adequate) buoyancy to support low-topped
thunderstorm development (per the 00Z BUF observed sounding). This
sounding also shows 50+ kt west-northwesterly flow just above the
boundary layer, and strengthening further with height, resulting in
elongated hodographs. It is not out of the question that some of the
deeper convective cells may produce a few strong wind gusts over the
next couple of hours, before the boundary layer stabilizes.

..Squitieri.. 11/04/2025

$$

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

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533
FLUS43 KLOT 040341
HWOLOT

Hazardous Weather Outlook
National Weather Service Chicago/Romeoville IL
941 PM CST Mon Nov 3 2025

ILZ003>006-008-010>013-019>021-023-032-033-039-103>108-INZ001-002-
010-011-019-050345-
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-
941 PM CST Mon Nov 3 2025 /1041 PM EST Mon Nov 3 2025/

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

.DAY ONE...Tonight.

Weather hazards expected...

No hazardous weather is expected at this time.

Tuesday...
Elevated Fire Weather Risk.

DISCUSSION...

Continued dry conditions, southerly wind gusts of up to 25 to 30
mph, and afternoon relative humidity values falling into the
25 to 30 percent range will lead to another day with a heightened
threat of fires igniting and spreading quickly tomorrow.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will not be necessary through tonight.

$$

LMZ740>745-050345-
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-
941 PM CST Mon Nov 3 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...Tuesday through Sunday.

Tuesday night through Sunday...
Hazardous conditions for small craft are likely at times

$$

Borchardt

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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106
ACUS02 KWNS 031707
SWODY2
SPC AC 031705

Day 2 Convective Outlook
NWS Storm Prediction Center Norman OK
1105 AM CST Mon Nov 03 2025

Valid 041200Z - 051200Z

...NO SEVERE THUNDERSTORM AREAS FORECAST...

...SUMMARY...
Isolated lightning flashes may occur with low-topped thunderstorms
approaching parts of coastal southwest Oregon and northern
California late Tuesday night into early Wednesday morning.
Organized severe thunderstorms are not forecast.

...Synopsis and Discussion...
Dry and/or stable conditions will limit thunderstorm potential
across a large majority of the CONUS on Tuesday. One exception may
exist for parts of coastal southwest OR and northern CA late Tuesday
night into early Wednesday morning. A highly amplified upper trough
will approach the West Coast late in the period, with pronounced
large-scale ascent overspreading the eastern Pacific and immediate
coast of OR/northern CA by 09-12Z Wednesday. With cooling mid-level
temperatures, weak but sufficient MUCAPE may exist to support
isolated lightning flashes with low-topped thunderstorms moving
onshore. Given the expected strength of the low/mid-level flow,
gusty winds may occur with this activity. However, the meager
forecast instability should limit the threat for organized severe
thunderstorms.

..Gleason.. 11/03/2025

$$

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

949
ACUS03 KWNS 031926
SWODY3
SPC AC 031925

Day 3 Convective Outlook
NWS Storm Prediction Center Norman OK
0125 PM CST Mon Nov 03 2025

Valid 051200Z - 061200Z

...NO SEVERE THUNDERSTORM AREAS FORECAST...

...SUMMARY...
Thunderstorms will be possible across parts of the Pacific Northwest
on Wednesday. Organized severe thunderstorms currently appear
unlikely.

...Synopsis and Discussion...
A large-scale upper trough will advance inland across the Pacific
Northwest on Wednesday. Cool mid-level temperatures and strong
large-scale ascent associated with the upper trough may support
sufficient but weak instability and the maintenance of a low-topped
band of thunderstorms. This activity should be ongoing along/near
the coast of WA/OR/northern CA at the start of the period early
Wednesday morning. Strong flow/shear is forecast at low/mid levels,
which would conditionally support organized convection. However,
surface-based instability is currently forecast to remain very weak,
which may tend to limit the overall severe threat along/near the
coast. Have therefore refrained from including low severe
probabilities at this time. The potential for isolated thunderstorms
may continue inland for portions of the higher terrain of WA/OR and
northern CA through the period as the upper trough continues
eastward.

..Gleason.. 11/03/2025

$$

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

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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

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.