SPC Convective Outlook Day 1

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092
ACUS01 KWNS 050100
SWODY1
SPC AC 050058

Day 1 Convective Outlook
NWS Storm Prediction Center Norman OK
0758 PM CDT Fri Jul 04 2025

Valid 050100Z - 051200Z

...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS OVER PARTS OF
NORTH-CENTRAL MINNESOTA...

...SUMMARY...
Severe thunderstorms capable of producing damaging wind gusts will
continue this evening over the Upper Midwest. Isolated severe gusts
and hail may occur over the central High Plains, with severe gusts
also possible from eastern Oregon into portions of the northern
Great Basin/Rockies.

...Upper Midwest...
Ahead of a midlevel shortwave trough tracking eastward from the
northern Plains into the Upper Midwest, a broken band of strong to
severe thunderstorms is ongoing across parts of northern MN. Ahead
of these storms, a warm/moist boundary layer (lower 70s dewpoints)
is yielding moderately unstable inflow, while 30-40 kt of mostly
front-parallel deep-layer shear (per recent VWP data) is promoting
some cold pool organization. As these storms continue
spreading/developing eastward this evening, damaging wind gusts will
remain possible prior to increasing nocturnal inhibition. Reference
Severe Thunderstorm Watch #486 for more information.

...Central High Plains...
A cluster of organized storms is evolving eastward across western KS
-- ahead of a lee trough/lee cyclone over the CO/KS border. The DDC
00Z sounding sampled a moderately unstable air mass and around 30 kt
of effective shear (with ample low-level hodograph curvature). This
environment should continue to support organized multicell clusters
and embedded supercell structures capable of producing severe wind
gusts and isolated large hail for the next few hours. For additional
information, see MCD #1565.

..Weinman.. 07/05/2025

$$

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

728
FLUS43 KLOT 042331
HWOLOT

Hazardous Weather Outlook
National Weather Service Chicago/Romeoville IL
631 PM CDT Fri Jul 4 2025

ILZ003>006-008-010>013-019>021-023-032-033-039-103>108-INZ001-002-
010-011-019-052345-
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-
631 PM CDT Fri Jul 4 2025 /731 PM EDT Fri Jul 4 2025/

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

.DAY ONE...Tonight.

No hazardous weather is expected at this time.

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

Saturday...
Limited Thunderstorm Risk...with an associated:
Level 1 of 5 Severe Thunderstorm Risk.
Sunday...
Limited Flooding Risk.
Limited Thunderstorm Risk.
Tuesday night through Thursday...
Limited Thunderstorm Risk.

DISCUSSION...

Scattered thunderstorms are expected to slowly track eastward
across northern Illinois late Saturday afternoon and night. Some
of these storms could produce locally damaging winds and heavy
rain.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will not be necessary through tonight.

$$

LMZ740>745-052345-
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-
631 PM CDT Fri Jul 4 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.

No hazardous weather is expected at this time.

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

Saturday...
Hazardous conditions for small craft are likely.
Limited Thunderstorm Risk.
Sunday...
Limited Thunderstorm Risk.
Tuesday through Thursday...
Limited Thunderstorm Risk.

$$

- Izzi

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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147
ACUS02 KWNS 041647
SWODY2
SPC AC 041645

Day 2 Convective Outlook
NWS Storm Prediction Center Norman OK
1145 AM CDT Fri Jul 04 2025

Valid 051200Z - 061200Z

...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS ON SATURDAY FROM
CENTRAL MONTANA AND NORTHEAST WYOMING INTO THE WESTERN DAKOTAS AND
THE NEBRASKA PANHANDLE...

...SUMMARY...
Strong to severe storms are likely across portions of the northern
High Plains tomorrow (Saturday), with hail and wind being the main
concerns. Isolated damaging gusts may also accompany the stronger
storms over the Upper Midwest.

...Northern High Plains...
The prominent shortwave trough currently tracking across southeast
OR will top the ridge over the northern High Plains on Saturday. As
this happens, large scale forcing will overspread much of eastern
MT/WY into the Dakotas. Deep southeasterly low-level winds into
this region will result in a corridor of moderate instability from
northeast WY into central MT, where steep low and mid-level lapse
rates will contribute to MLCAPE values over 2000 J/kg.
Thunderstorms will begin increasing by early afternoon, with storms
spreading into the Dakotas by evening. Supercells and bowing
structures are expected, with a risk of large hail and damaging wind
gusts.

...Upper Midwest...
Current water vapor loop shows a weak shortwave trough over eastern
WY. This feature will strengthen and move into the upper Midwest
tomorrow. A surface cold front will extend from northeast IA into
central WI by afternoon, providing the focus for scattered
thunderstorm development. Mid-level lapse rates will be weak, but
ample low-level moisture should provide sufficient CAPE for a few
strong storms capable of gusty/damaging winds. A few of the 12z CAM
solutions suggest a few organized storm clusters and some potential
for a zone of greater severe concern from northeast IA into
southwest WI. Will maintain MRGL risk for now, but monitor for an
upgrade in later outlooks.

...Southern High Plains...
Scattered afternoon thunderstorms are expected on Saturday across
much of the southern High Plains from eastern CO into southwest KS,
the TX Panhandle, and eastern NM. Forecast soundings show steep
low-level lapse rates and sufficient northwest flow aloft for some
convective organization. Multiple clusters of storms capable of
gusty/damaging winds and hail are expected. Parts of this region
may need an upgrade to SLGT as mesoscale details become more clear.

..Hart.. 07/04/2025

$$

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.

SPC Convective Outlook Day 3

See Product Description

097
ACUS03 KWNS 041836
SWODY3
SPC AC 041835

Day 3 Convective Outlook
NWS Storm Prediction Center Norman OK
0135 PM CDT Fri Jul 04 2025

Valid 061200Z - 071200Z

...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS ON SUNDAY ACROSS
PARTS OF THE CENTRAL HIGH PLAINS...

...SUMMARY...
A few storms may produce isolated severe wind and hail along the
central High Plains on Sunday.

...Central High Plains...
A broad upper ridge will be in place on Sunday across most of the
central and southern US, with the mid-level westerlies extending
across the northern states. Scattered afternoon and evening
thunderstorms are expected throughout the High Plains from MT to TX,
but the area of greatest concern for a few strong/severe storms will
extend from the Black Hills region into northeast NM. Strong
heating and steep lapse rates will promote some risk of damaging
winds and hail in the strongest cells. Parts of western NE may
require higher severe probabilities in later outlooks.

..Hart.. 07/04/2025

$$

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.

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.