SPC Convective Outlook Day 1

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457
ACUS01 KWNS 250529
SWODY1
SPC AC 250528

Day 1 Convective Outlook
NWS Storm Prediction Center Norman OK
1228 AM CDT Tue Mar 25 2025

Valid 251200Z - 261200Z

...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS ACROSS SOUTHEAST
FLORIDA PENINSULA...AND FROM CENTRAL TEXAS INTO SOUTHEAST
OKLAHOMA...

...SUMMARY...
Gusty winds, along with some risk for hail, will accompany isolated
thunderstorms across the southeastern Florida Peninsula, and parts
of southeast Oklahoma into central Texas.

...Southern FL Peninsula...

Upper trough is firmly established over the eastern U.S. early this
morning. Along the southern fringe of this wave, a low-latitude
short-wave trough is digging east-southeast toward the southern FL
Peninsula. Latest model guidance suggests seasonally cool mid-level
temperatures will spread across this region with -13C at 500mb
forecast by mid day as surface temperatures warm into the lower 80s.
Early-afternoon soundings exhibit substantial SBCAPE with steep
mid-level lapse rates. While wind profiles will remain somewhat
modest, solenoidal influences should encourage isolated convection,
some of which could be robust. Gusty winds, and perhaps some hail
could be noted with this diurnally driven activity.

...Southeast Oklahoma/North Central-Central TX...

Large-scale pattern is not forecast to change appreciably during the
upcoming day1 period as ridging will dominate the western U.S.
Northwesterly flow will be noted across the Plains and any embedded
disturbances are currently weak and not particularly evident. Even
so, while heights will gradually rise across this region, 2km wind
field will gradually strengthen over the southern High Plains and
some increase in PW is expected along the I35 corridor from central
TX into southern OK by 26/00z. Strong boundary-layer heating is
expected west of I35 and convective temperatures will be breached by
late afternoon as readings rise through the mid 80s. Most HREF
members suggest isolated, relatively high-based convection will
evolve along this corridor. Gusty winds and some hail appear
possible with this activity. After sunset, low-level warm advection
should focus ascent from southeast OK into northeast TX. This
elevated activity could also generate hail, and perhaps some wind
gusts.

..Darrow/Lyons.. 03/25/2025

$$

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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972
FLUS43 KLOT 250904
HWOLOT

Hazardous Weather Outlook
National Weather Service Chicago/Romeoville IL
404 AM CDT Tue Mar 25 2025

ILZ003>006-008-010>013-019>021-023-032-033-039-103>108-INZ001-002-
010-011-019-260915-
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-
404 AM CDT Tue Mar 25 2025 /504 AM EDT Tue Mar 25 2025/

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

.DAY ONE...Today and Tonight.

No hazardous weather is expected at this time.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday.

Thursday Night into Friday Morning...
Limited Thunderstorm Risk.
Saturday and Sunday...
Limited Thunderstorm Risk.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will not be necessary through tonight.

$$

LMZ740>745-260915-
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-
404 AM CDT Tue Mar 25 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...Today and Tonight.

No hazardous weather is expected at this time.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday.

Friday and Saturday...
Limited Thunderstorm Risk.

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

$$

Castro

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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249
ACUS02 KWNS 250558
SWODY2
SPC AC 250556

Day 2 Convective Outlook
NWS Storm Prediction Center Norman OK
1256 AM CDT Tue Mar 25 2025

Valid 261200Z - 271200Z

...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS ACROSS PORTIONS
OF THE PACIFIC NORTHWEST...

...SUMMARY...
Isolated severe thunderstorms are possible across parts of the
Pacific Northwest on Wednesday afternoon into the evening.

...Synopsis...
Slow progression of the upper pattern -- a general western
ridge/eastern trough configuration -- is expected Wednesday.
Upstream, an eastern Pacific trough/low will strengthen as it nears
the Pacific Northwest Coast.

At the surface, a rather ill-defined baroclinic zone will extend
from Florida to Texas. Meanwhile, a cold front -- associated with a
deepening/occluded low off the coast -- will shift into the Pacific
Northwest through the day.

...Pacific Northwest...
Ahead of the cold front forecast to move eastward across the area
during the afternoon and evening, daytime heating of a modestly
moist boundary layer will result in at least marginal
destabilization. Questions persist regarding the degree of
low-level moisture, which will likely modulate storm development and
subsequent intensity.

With that said, diffluent flow aloft ahead of the approaching upper
low, and increasingly strong southerly deep-layer flow would
otherwise suggest a favorable setup for isolated severe storms. At
this time, will maintain 5%/MRGL risk for hail/wind, as low-level
flow/shear should remain weak. However, the favorable overall setup
could yield greater coverage/risk than currently indicated, and thus
modifications in subsequent outlooks may be needed.

...Far West Texas vicinity...
A dry/capped airmass and weak shear is expected across the Permian
Basin/Transpecos Region/Davis Mountains. However, presuming an
isolated storm or two can develop near the dryline, steep lapse
rates aloft would suggest potential for briefly intense updrafts.
Any storm which would develop could produce hail/wind, but any risk
is highly conditional and does not appear to warrant inclusion of a
risk area at this time.

..Goss.. 03/25/2025

$$

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

792
ACUS03 KWNS 250736
SWODY3
SPC AC 250736

Day 3 Convective Outlook
NWS Storm Prediction Center Norman OK
0236 AM CDT Tue Mar 25 2025

Valid 271200Z - 281200Z

...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS ACROSS PARTS OF
THE MID MISSOURI VALLEY AND MIDWEST...AND ACROSS PARTS OF WESTERN
AND SOUTHERN TEXAS...

...SUMMARY...
A few strong/severe storms will be possible Thursday from the Mid
Missouri Valley into the Ohio Valley, and across parts of western
and southern Texas.

...Synopsis...
Deamplification of the upper pattern across the U.S. is expected
Thursday, as an eastern U.S. trough departs into the Atlantic, and
deamplifying eastern Pacific troughing shifts into the West.
Meanwhile, a weak southern-stream trough is forecast to cross
northern Mexico and the southern Plains through Friday morning.

At the surface, a cold front is expected to advance across the
Intermountain West, associated with the filling/occluded low off the
Pacific Northwest coast. Meanwhile, a warm front is forecast to
advance northward across the central U.S., and should extend from
the northern Plains east-southeastward into the Ohio Valley by the
end of the period.

...Portions of western and southern Texas, including the Rio Grande
Valley...
Afternoon heating will result in airmass destabilization across
Texas, as cool air aloft associated with the southern-stream trough
spreads across the region. While flow aloft will remain modest,
ample CAPE suggests a few stronger storms will be possible, with
risk for hail and gusty/damaging winds. Coverage of stronger
convection should remain sparse, but enough to warrant introduction
of 5%/MRGL risk for the afternoon and evening hours.

...Mid Missouri Valley across the Corn Belt...
Low-level warm advection will be maximized near and north of a warm
front advancing northward across the central CONUS. Sufficiently
steep mid-level lapse rates will support ample elevated CAPE,
resulting in a zone of strong storm potential from eastern Nebraska
east-southeastward to Indiana. With west-northwesterly mid-level
flow expected to average around 35 kt near the frontal zone,
sufficient shear will exist to allow occasionally stronger storms to
evolve -- a few capable of producing severe-caliber hail.

..Goss.. 03/25/2025

$$

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.