SPC Convective Outlook Day 1

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944
ACUS01 KWNS 222000
SWODY1
SPC AC 221959

Day 1 Convective Outlook
NWS Storm Prediction Center Norman OK
0159 PM CST Sun Dec 22 2024

Valid 222000Z - 231200Z

...NO SEVERE THUNDERSTORM AREAS FORECAST...

...SUMMARY...
Severe thunderstorms are not forecast across the contiguous United
States through tonight.

...20Z Update...
Lightning flashes continue to be observed just offshore of the
northern CA coastline as a mid-level trough approaches the Pacific
Northwest. As the mid-level trough continues to advance toward the
coastline later this afternoon and evening, increased mid-level
cooling aloft will encourage at least isolated onshore thunderstorm
development. As such, no changes have been made to the previous
forecast.

..Squitieri.. 12/22/2024

.PREV DISCUSSION... /ISSUED 1003 AM CST Sun Dec 22 2024/

...Northern CA/Pacific Northwest coast through tonight...
Lightning flashes have been observed this morning within a
baroclinic band roughly 150 mi off the northern CA coast, in
association with a midlevel shortwave trough that will move inland
later today into tonight. The potential for isolated lightning
flashes inland will begin this afternoon with elevated convection in
the warm conveyor belt across northwest CA/southwest OR. Other
isolated lightning flashes may also occur this evening into early
tonight along the WA coast as steeper low-midlevel lapse rates and
weak buoyancy spread inland.

$$

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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869
FLUS43 KLOT 220958
HWOLOT

Hazardous Weather Outlook
National Weather Service Chicago/Romeoville IL
358 AM CST Sun Dec 22 2024

ILZ003>006-008-010>013-019>021-023-032-033-039-103>108-INZ001-002-
010-011-019-231000-
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-
358 AM CST Sun Dec 22 2024 /458 AM EST Sun Dec 22 2024/

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

.DAY ONE...Today and Tonight.

Weather hazards expected...

Limited Ice Accumulation Risk Late Tonight.

DISCUSSION...

Freezing drizzle is possible overnight toward daybreak and may
causing a light glaze of ice accumulation on untreated and
elevated surfaces.

.DAYS TWO THROUGH SEVEN...Monday through Saturday.

Monday Morning...
Limited Ice Accumulation Risk.

DISCUSSION...

Freezing drizzle will be possible Monday morning during the
morning commute, before temperatures warm above freezing by mid
morning.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will not be necessary through tonight.

$$

LMZ740>745-231000-
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-
358 AM CST Sun Dec 22 2024

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...Today and Tonight.

Weather hazards expected...

Hazardous conditions for small craft.

.DAYS TWO THROUGH SEVEN...Monday through Saturday.

Monday...
Hazardous conditions for small craft are likely.

$$

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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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913
ACUS02 KWNS 221718
SWODY2
SPC AC 221716

Day 2 Convective Outlook
NWS Storm Prediction Center Norman OK
1116 AM CST Sun Dec 22 2024

Valid 231200Z - 241200Z

...NO SEVERE THUNDERSTORM AREAS FORECAST...

...SUMMARY...
Severe thunderstorms are not expected on Monday.

A midlevel shortwave trough will amplify from the central Rockies to
the south-central High Plains on Monday. A weak surface low will
likely develop across Texas into southern Oklahoma, with a modest
increase in low-level moisture across central/east Texas into
southern Oklahoma in advance of a cold front moving southeastward
across the southern High Plains. Increasing forcing for ascent and
elevated moisture transport should lead to increasing elevated
convection Monday night across north/northeast Texas into southeast
Oklahoma and the ArkLaTex. While a mid-level capping inversion may
tend to persist, updrafts should increasingly reach a sufficient
depth/temperature late Monday night into early Tuesday for at least
isolated thunderstorms. Severe thunderstorms are not currently
expected given access to only weak elevated buoyancy.

Isolated thunderstorms will also be possible late Monday night
across the coastal Pacific Northwest and northern California as
temperatures aloft cool with the approaching mid-level trough.

..Bentley.. 12/22/2024

$$

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

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948
ACUS03 KWNS 221930
SWODY3
SPC AC 221929

Day 3 Convective Outlook
NWS Storm Prediction Center Norman OK
0129 PM CST Sun Dec 22 2024

Valid 241200Z - 251200Z

...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS ACROSS
SOUTH-CENTRAL/SOUTHEAST TEXAS...

...SUMMARY...
A few strong storms could occur across parts of south-central and
southeast Texas on Tuesday.

...Synopsis...
A progressive upper-level pattern will be present on Tuesday as a
positively tilted mid-level trough moves off the Northeast Coast. A
weaker positively tilted trough amplifies across the central CONUS
and a much stronger trough moves inland across the West Coast.
Overall, high pressure will dominate most of the CONUS with a weak
low-pressure center along a frontal zone in the southern Plains and
weak low-pressure in the InterMountain West.

...Southern Plains...
Low to mid 60s dewpoints will advect inland across southern/eastern
Texas on Tuesday as low-level flow strengthens south of a developing
cold front. Mid-level cooling ahead of the approaching mid-level
shortwave trough will steepen lapse rates and result in weak to
potentially moderate instability. Thunderstorms will likely be
ongoing near the surface front Tuesday morning with the
front/composite outflow drifting slowly south during the day. Some
diurnal increase in intensity is possible from this activity. In
addition, strengthening of the low-level jet through the day may
provide enough isentropic ascent for scattered thunderstorm
development during the afternoon/evening across the open warm
sector. Initially, deep-layer shear will be weak during the morning,
but will increase to around 30 to 35 knots by the afternoon/early
evening. This could result in some rotating updrafts with the
potential for some large hail or a few wind gusts.

...Pacific Northwest/Northern California...
A surface front will likely be located somewhere near the
northern/central California coast at 12Z Tuesday. Forecast soundings
ahead of this front show shallow/weak instability which could favor
an isolated wind gust, but lightning activity should be minimal. A
better chance for open-cell convection will be during the afternoon
along the Pacific Northwest/California coast as mid-level temps cool
and deeper instability develops. However, by this time, relatively
weak flow should limit storm organization/intensity.

..Bentley.. 12/22/2024

$$

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

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717
WWUS83 KLOT 222047
SPSLOT

Special Weather Statement
National Weather Service Chicago/Romeoville IL
247 PM CST Sun Dec 22 2024

ILZ003>006-011>013-020-021-023-033-103>108-INZ001-002-010-011-019-
230500-
Winnebago-Boone-McHenry-Lake IL-De Kalb-Kane-DuPage-Kendall-
Grundy-Kankakee-Iroquois-Northern Cook-Central Cook-Southern Cook-
Northern Will-Southern Will-Eastern Will-Lake IN-Porter-Newton-
Jasper-Benton-
Including the cities of Rockford, Belvidere, Crystal Lake,
Algonquin, McHenry, Woodstock, Waukegan, Buffalo Grove,
Mundelein, Gurnee, DeKalb, Sycamore, Aurora, Elgin, Naperville,
Wheaton, Downers Grove, Lombard, Carol Stream, Oswego, Yorkville,
Plano, Morris, Coal City, Minooka, Kankakee, Bourbonnais,
Bradley, Watseka, Gilman, Evanston, Des Plaines, Schaumburg,
Palatine, Northbrook, Chicago, Cicero, Oak Lawn, Oak Park,
La Grange, Calumet City, Oak Forest, Lemont, Orland Park,
Park Forest, Joliet, Bolingbrook, Plainfield, Mokena, Channahon,
Manhattan, Wilmington, Crete, Peotone, Beecher, Gary, Hammond,
Merrillville, Portage, Valparaiso, Chesterton, Roselawn,
Kentland, Morocco, Rensselaer, DeMotte, Fowler, and Oxford
247 PM CST Sun Dec 22 2024 /347 PM EST Sun Dec 22 2024/

...Slippery Travel Conditions Possible Monday Morning...

Drizzle may develop across the area prior to sunrise Monday
morning. With temperatures expected to remain at or below freezing
through mid-morning, any drizzle that forms will result in icy
and slippery conditions on untreated or elevated surfaces. Plan to
check the latest forecasts and be prepared for extra travel time
Monday morning.

$$

Kluber

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.