SPC Convective Outlook Day 1

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526
ACUS01 KWNS 020531
SWODY1
SPC AC 020530

Day 1 Convective Outlook
NWS Storm Prediction Center Norman OK
1130 PM CST Sun Mar 01 2026

Valid 021200Z - 031200Z

...NO SEVERE THUNDERSTORM AREAS FORECAST...

...SUMMARY...
Thunderstorms are possible across parts of the central U.S., in
south Florida, and from the Intermountain West into the central High
Plains.

...Discussion...

Great Basin to southern Wyoming: Notable upper trough is
approaching the northern CA coast late this evening. This feature is
forecast to advance into the eastern Great Basin as a 500mb speed
max translates across southern NV into southern UT. Cool midlevel
temperatures and steep lapse rates north of the jet favor weak
buoyancy along a corridor from northern NV into southern WY.
Forecast soundings suggest SBCAPE could approach 500 J/kg by peak
heating. While deep-layer shear will be strong along the northern
fringe of the jet, current thinking is convection that evolves
across this region should not produce more than gusty winds, as PW
values are quite low.

Central U.S.: LLJ is forecast to increase across the southern Plains
into southern MO during the latter half of the period. Low-level
warm advection will be the primary forcing mechanism for potential
convective development during the overnight hours as the warm front
advances north into KS/MO. Forecast soundings suggest elevated
thunderstorms will not have enough instability to warrant a risk for
severe hail.

Southern Florida: Easterly low-level flow will persist during the
day1 period which should favor convection concentrating near the
southern FL Gulf coast. However, forecast midlevel lapse rates are
quite poor and this diurnally enhanced activity should remain weak
and sub-severe.

..Darrow/Lyons.. 03/02/2026

$$

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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747
FLUS43 KLOT 020959
HWOLOT

Hazardous Weather Outlook
National Weather Service Chicago/Romeoville IL
359 AM CST Mon Mar 2 2026

ILZ003>006-008-010>013-019>021-023-032-033-039-103>108-INZ001-002-
010-011-019-031000-
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-
359 AM CST Mon Mar 2 2026 /459 AM EST Mon Mar 2 2026/

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

.DAY ONE...Early this Morning through Tonight.

Weather hazards expected...

Limited Ice Accumulation Risk late tonight interior northern
Illinois

Spotty showers are possible late tonight, which may lead to
patchy slick spots on untreated surfaces in portions of interior
northern Illinois if and where temperatures fall below freezing.

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

Tuesday night through Friday...
Limited Thunderstorm Risk at times.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will not be necessary through tonight.

$$

LMZ740>745-031000-
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-
359 AM CST Mon Mar 2 2026

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...Early this Morning through Tonight.

No hazardous weather is expected at this time.

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

Wednesday through Friday...
Limited Thunderstorm Risk at times.

$$

Petr

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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317
ACUS02 KWNS 020658
SWODY2
SPC AC 020657

Day 2 Convective Outlook
NWS Storm Prediction Center Norman OK
1257 AM CST Mon Mar 02 2026

Valid 031200Z - 041200Z

...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS FROM PARTS OF
WESTERN OKLAHOMA INTO SOUTH-CENTRAL AND EASTERN KANSAS...

...SUMMARY...
Isolated severe storms with large hail will be possible Tuesday and
Tuesday night from parts of western Oklahoma into south-central and
eastern Kansas.

...Southern and Central Plains...
At mid-levels, a shortwave trough will move eastward into the
southern Rockies as flow remains southwesterly over the southern and
central Plains. At the surface, a cold front will advance southward
across Kansas during the day and into western and northern Oklahoma
during the evening. Increasing large-scale ascent ahead of the
approaching trough will likely support isolated thunderstorm
development near the front and across the post-frontal airmass
during the evening and overnight. NAM forecast soundings from
western Oklahoma into south-central Kansas around midnight have
effective shear of 40 to 50 knots, with 700-500 mb lapse rates in
the 7.5 to 8 C/km range. This suggests that isolated large hail will
be possible with rotating storms. The threat is expected to remain
marginal and could persist into the early morning hours on
Wednesday.

..Broyles.. 03/02/2026

$$

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

264
ACUS03 KWNS 020825
SWODY3
SPC AC 020824

Day 3 Convective Outlook
NWS Storm Prediction Center Norman OK
0224 AM CST Mon Mar 02 2026

Valid 041200Z - 051200Z

...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS ACROSS PARTS OF
THE SOUTHERN PLAINS AND WESTERN OZARKS...

...SUMMARY...
Severe storms with large hail and damaging wind gusts will be
possible on Wednesday from the southern Plains into the western
Ozarks. Marginally severe storms will be possible from the northern
Ozarks into the Ohio Valley.

...Southern Plains/Western Ozarks...
At mid-levels, a shortwave trough will move into the southern and
central Plains on Wednesday. At the surface, a cold front will
advance southeastward into the southern Plains and western Ozarks.
Ahead of the front, surface dewpoints will be in the 60s F. As
surface temperatures warm during the day across this moist airmass,
pockets of moderate instability appear likely to develop from
north-central and northeast Texas into southeastern Oklahoma and
western Arkansas. As low-level convergence increases near the front
in the afternoon, scattered thunderstorms are expected to form.
Isolated thunderstorms will also be possible to the south and east
of the front over the warm sector. Forecast soundings at 21Z from
northeast Texas into western Arkansas have MLCAPE peaking in the
1200 to 1500 J/kg range, with 0-6 km shear around 40 knots. In
addition, 700 to 500 mb lapse rates are forecast to be in the 7.5 to
8 C/km range. This environment will support severe thunderstorms in
the afternoon and evening, with a potential for large hail and
severe wind gusts, and perhaps a tornado threat. The severe threat
will be maximized in areas with supercell development. The severe
threat will likely persist into the late evening as a low-level jet
strengthens.

...Northern Ozarks/Mid Mississippi and Ohio Valleys...
West-southwesterly mid-level flow will be located from the mid
Mississippi Valley eastward into the Ohio Valley on Wednesday. At
the surface, a low will move eastward from northern Missouri into
north-central Illinois during the day. A warm front will advance
northward across Illinois, Indiana and Ohio. To the south of the
warm front, surface dewpoints in the 50s F will contribute to the
development of weak instability. Along the instability axis, a 30 to
40 knot low-level jet is forecast to consolidate over the Ohio
Valley in the afternoon and evening. Lift associated with the
low-level jet will support the formation of isolated to scattered
thunderstorms. Effective shear near 40 knots and 700-500 mb lapse
rates around 7.5 C/km should be favorable for a marginal severe
threat. Hail and isolated severe wind gusts will be possible.

..Broyles.. 03/02/2026

$$

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.