SPC Convective Outlook Day 1

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507
ACUS01 KWNS 150547
SWODY1
SPC AC 150546

Day 1 Convective Outlook
NWS Storm Prediction Center Norman OK
1246 AM CDT Tue Apr 15 2025

Valid 151200Z - 161200Z

...NO SEVERE THUNDERSTORM AREAS FORECAST...

...SUMMARY...
Thunderstorms will be possible today in parts of the Northeast, Four
Corners, south-central Rockies and from western Nevada into
California. No severe weather is expected.

...DISCUSSION...
At mid-levels, a ridge will move eastward into the south-central
U.S. today, as a trough moves into the eastern states. Isolated
thunderstorms will be possible in parts of the Northeast as surface
temperatures warm, and as a band of strong large-scale ascent moves
from west to east across the region. In the western states, a
shortwave trough will move northeastward into the Four Corners.
Ahead of the trough, isolated thunderstorm development will take
place today from the Four Corners eastward into the south-central
Rockies. A few storms may also develop from the Sierras into
northern California, ahead a mid-level low that will approach the
coast of California. No severe weather is expected today or tonight
across the continental U.S.

..Broyles/Wendt.. 04/15/2025

$$

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

634
FLUS43 KLOT 150156
HWOLOT

Hazardous Weather Outlook
National Weather Service Chicago/Romeoville IL
856 PM CDT Mon Apr 14 2025

ILZ003>006-008-010>013-019>021-023-032-033-039-103>108-INZ001-002-
010-011-019-160200-
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-
856 PM CDT Mon Apr 14 2025 /956 PM EDT Mon Apr 14 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...Tuesday through Sunday.

Tuesday...
Elevated Fire Weather Risk.
Thursday...
Elevated Thunderstorm Risk.
Friday...
Elevated Thunderstorm Risk...with an associated:
Level 2 of 5 Severe Thunderstorm Risk.

DISCUSSION...

Gusty northwest winds, low relative humidity, and remaining dry
vegetation will support a continued localized elevated risk of
brush fires on Tuesday.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will not be necessary through tonight.

$$

LMZ740>745-160200-
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-
856 PM CDT Mon Apr 14 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...

Gale force winds are expected.

.DAYS TWO THROUGH SEVEN...Tuesday through Sunday.

Tuesday...
Gale force winds are expected.
Thursday...
Hazardous conditions for small craft are likely.
Elevated Thunderstorm Risk.
Friday...
Elevated Thunderstorm Risk...with an associated:
Level 2 of 5 Severe Thunderstorm Risk.

$$

Yack

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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228
ACUS02 KWNS 150539
SWODY2
SPC AC 150537

Day 2 Convective Outlook
NWS Storm Prediction Center Norman OK
1237 AM CDT Tue Apr 15 2025

Valid 161200Z - 171200Z

...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS IN A PORTION OF
THE CENTRAL GREAT PLAINS...

...SUMMARY...
Isolated severe thunderstorms, with a primary threat of large hail,
are possible on Wednesday evening/night across parts of the central
Great Plains.

...Synopsis...
A northern-stream shortwave trough is expected to dig southward from
the Canadian Rockies into the northern Intermountain West. A
southern-stream, lower-amplitude shortwave trough will drift towards
the southern CA coast. A pair of lee cyclones will develop near the
Black Hills and the CO/KS border area by Wednesday evening.

...Central Great Plains...
Just-in-time modified moisture return from south TX is anticipated
by early evening, yielding potential for isolated high-based
thunderstorm development near the southwest KS/far northwest OK
border area. This portion of the dryline, to the east-southeast of
the aforementioned cyclone, will have the best chance of sustaining
deep convection with overlap of the low-level thermal ridge/weak
buoyancy. Substantial veering of the wind profile with height could
support a high-based supercell or two with severe hail/wind.

The 00Z HRW-FV3 is a distinct outlier in indicating potential for a
discrete supercell deeper into the evening across south-central KS,
that impinges on greater low-level moisture amid enlarged low-level
hodograph curvature. Bulk of guidance otherwise suggests a
substantial increase in MLCIN after sunset as the low-level jet
intensifies from west TX into KS, with convection probably
struggling given the sub-optimal moisture relative to the stout EML.

Elevated convection should form later Wednesday night into early
morning Thursday, along the leading edge of the 700-mb warm front
and towards the exit region of the low-level jet. Although this
convection may remain rooted near 700 mb, favorable speed shear
through the cloud-bearing layer should offer a risk of isolated
severe hail overnight towards the Lower MO Valley.

..Grams.. 04/15/2025

$$

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

645
ACUS03 KWNS 150722
SWODY3
SPC AC 150721

Day 3 Convective Outlook
NWS Storm Prediction Center Norman OK
0221 AM CDT Tue Apr 15 2025

Valid 171200Z - 181200Z

...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS IN IA/NORTHERN
MO/EASTERN NE...

...SUMMARY...
Scattered severe thunderstorms, with a primary threat of large hail,
are possible on Thursday evening/night, centered on eastern
Nebraska, northern Missouri, and Iowa.

...Synopsis...
A longwave trough, consisting of multiple embedded shortwave
impulses, will become established from the southern Prairie
Provinces across the West to off the Baja CA coast. Peak surface
cyclone amplitude is expected over western KS on Thursday afternoon,
with a surface trough/baroclinic zone extending north-northeast into
MN. A dryline will arc across eastern KS into the southern Great
Plains. The cyclone will fill as it tracks east-northeast along the
baroclinic zone towards the MO/IA border area Thursday night.

...IA/MO/NE...
Along the leading edge of a stout EML and effective 700-mb warm
front, isolated to scattered elevated convection should be ongoing
at 12Z Thursday across parts of the Lower MO Valley. This activity
may persist eastward through the morning and pose a threat for
isolated severe hail. Neutral mid-level height change is anticipated
in its wake, likely confining early evening surface-based storm
potential to immediately downstream of the triple-point region in
the KS/NE/MO/IA border area. While the spatial extent of MLCIN away
from the dryline is a concern, another day of modifying moisture
return northward from the western Gulf should yield a confined plume
of upper 50s surface dew points and moderate buoyancy. A veering
wind profile with height will foster strong deep-layer shear and
supercell potential.

As the low-level jet becomes rather strong across OK/KS/MO, greater
convective coverage is anticipated Thursday night. Elevated storms
producing large hail should be the primary hazard from the
post-frontal environment in central/eastern NE to across the Mid-MS
Valley by early morning Friday.

..Grams.. 04/15/2025

$$

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.

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.