Essentials:

Regional Satellite and Radar...

-with Watches and Warnings
-with Lightning Detection

Helpful Information:

Weather Safety:

Current Conditions

A message from COD Meteorology

Current Local Radar

Temperature
76°F
Feels Like:
76°F
Dew Point	Humidity
54°F	46%

Fair

Wind Strength
Light	Moderate	Strong
Southeast at 11 mph

Local Graphical Forecast (Updated: 08/25/19 1:16 pm)

Sunday (8/25)
Day	Night

	40%
High	Low
78	64

Monday (8/26)
Day	Night

70%	70%
High	Low
79	67

Tuesday (8/27)
Day	Night


High	Low
81	59

Wednesday (8/28)
Day	Night


High	Low
75	56

Thursday (8/29)
Day	Night


High	Low
78	62

Friday (8/30)
Day	Night

	15%
High	Low
77	58

Saturday (8/31)
Day	Night


High	Low
74

Detailed Text Forecast (Updated: 08/25/19 1:16 pm)

Sunday: A slight chance of sprinkles after 3pm. Partly sunny, with a high near 78. East southeast wind around 10 mph, with gusts as high as 20 mph.

Sunday Night: A slight chance of sprinkles before 7pm, then a chance of showers after 11pm. Mostly cloudy, with a low around 64. East southeast wind 5 to 10 mph. Chance of precipitation is 40%.

Monday: Showers and thunderstorms likely before 1pm, then a chance of showers between 1pm and 4pm, then a chance of showers and thunderstorms after 4pm. Mostly cloudy, with a high near 79. Southeast wind 5 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 70%. New rainfall amounts between a half and three quarters of an inch possible.

Monday Night: Showers likely and possibly a thunderstorm before 1am, then a chance of showers. Mostly cloudy, with a low around 67. South wind around 10 mph, with gusts as high as 15 mph. Chance of precipitation is 70%.

Tuesday: Mostly sunny, with a high near 81. West wind around 10 mph, with gusts as high as 20 mph.

Tuesday Night: Mostly clear, with a low around 59.

Wednesday: Sunny, with a high near 75.

Wednesday Night: Mostly clear, with a low around 56.

Thursday: Sunny, with a high near 78.

Thursday Night: Mostly clear, with a low around 62.

Friday: Mostly sunny, with a high near 77.

Friday Night: A slight chance of showers. Partly cloudy, with a low around 58.

Saturday: Mostly sunny, with a high near 74.

Campus Weather®:
Provided by College of DuPage
Built and Maintained by: COD Meteorology "NEXLAB"
Copyright © 2019

Contact COD Meteorology "NEXLAB":
Phone: 630-942-2590
Web: Contact Form

Contact College of Dupage:
Phone: 630-942-2800

College of DuPage:
Meteorology at COD
Earth Science at COD
COD AMS Student Weather Club
Programs of Study at COD
COD Admissions

Downers Grove South High School:
Home Page

SPC Convective Outlook Day 1

See Product Description

082
ACUS01 KWNS 251625
SWODY1
SPC AC 251624

Day 1 Convective Outlook
NWS Storm Prediction Center Norman OK
1124 AM CDT Sun Aug 25 2019

Valid 251630Z - 261200Z

...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS THIS AFTERNOON
INTO TONIGHT FROM THE DAKOTAS INTO NORTHERN NE...

...SUMMARY...
Thunderstorms with large hail and a few damaging gusts are expected
over parts of the Dakotas this afternoon/evening into northern
Nebraska overnight.

...Dakotas to NE this afternoon into tonight...
A northern stream shortwave trough will amplify over the northern
High Plains through tonight. An initial surface trough/cold front
across the western Dakotas will continue eastward into the eastern
Dakotas and southeastward into NE by the end of the period. A
narrow zone of surface heating along the surface trough and weak
large-scale ascent will support thunderstorm development this
afternoon/evening across the central Dakotas, and storms will
subsequently spread eastward and southeastward tonight. Steep
midlevel lapse rates will combine with the surface heating and
boundary-layer dewpoints in the mid 60s to result in MLCAPE of
1500-2500 J/kg immediately east of the surface trough this
afternoon.

Deep-layer vertical shear with straight hodographs will initially
favor supercells capable of producing large hail, though upscale
growth into clusters/line segments with damaging winds appears
probable this evening before the convection begins to spread east of
the stronger buoyancy. The southern flank of the frontal convection
is likely to maintain intensity the longest, potentially developing
southward into NE in conjunction with the surface triple point and
warm advection on the nose of 30-40 kt nocturnal low-level jet.

Other more isolated storms will be possible later this evening from
the Big Horns into southwestern SD, in the immediate post-frontal
upslope flow regime. Deep-layer vertical shear will be favorable
for supercells, though limited moisture/buoyancy should tend to
temper the hail/wind threat somewhat.

...OK/AR/MO this afternoon...
A convectively enhanced midlevel trough is moving eastward over
eastern KS and northeastern OK as of mid morning. Vertical shear
will be strongest to the west of the trough in conjunction with the
stronger northwesterly midlevel flow. However, storm initiation
beyond ongoing convection in the warm advection zone near I-35 along
the KS/OK border is unlikely given the expected onset of subsidence
in the wake of the midlevel trough. Some destabilization is
expected south through east of the convective outflow, though clouds
are relatively widespread and will likely continue to slow surface
heating. Overall, it appears that a marginal threat for damaging
wind is the primary concern with multicell clusters along the
outflow boundary this afternoon from southern MO into northwestern
AR and southeastern OK.

..Thompson/Cook.. 08/25/2019

$$

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

839
FLUS43 KLOT 251820
HWOLOT

Hazardous Weather Outlook
National Weather Service Chicago/Romeoville IL
120 PM CDT Sun Aug 25 2019

ILZ003>006-008-010>014-019>023-032-033-039-INZ001-002-010-011-019-
261830-
Winnebago-Boone-McHenry-Lake IL-Ogle-Lee-De Kalb-Kane-DuPage-Cook-
La Salle-Kendall-Grundy-Will-Kankakee-Livingston-Iroquois-Ford-
Lake IN-Porter-Newton-Jasper-Benton-
120 PM CDT Sun Aug 25 2019 /220 PM EDT Sun Aug 25 2019/

This Hazardous Weather Outlook is for portions of North Central
Illinois...Northeast Illinois and Northwest Indiana.

.DAY ONE...This Afternoon and Tonight.

Weather hazards expected...

Limited Thunderstorm Risk overnight.

DISCUSSION...

A couple non-severe thunderstorms are possible overnight.

There is a chance along the northeast Illinois shore north of
Chicago that a risk of high rip currents develops, mainly
tonight.

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

Monday...
Limited Severe Thunderstorm Risk.
Limited Flooding Risk.
High Swim Risk
Tuesday...
Limited Thunderstorm Risk.
Friday...
Limited Thunderstorm Risk.

DISCUSSION:

A strong cold front moving across the region Monday night will
bring a period of showers and thunderstorms to the outlook area.
With deep layer moisture pooling ahead of the front, there will be
a chance for some storms to produce locally heavy rainfall and the
potential for some localized flooding. The high levels of deep
layer moisture along with moderate instability will bring a chance
for some of the stronger storms to become severe, with damaging
winds the primary severe threat.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will not be necessary through tonight.

GENERAL STORM MOTION OF THE DAY:

Moving toward the northeast at 30 mph.

$$

LMZ740>745-261830-
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-
120 PM CDT Sun Aug 25 2019

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...This Afternoon and Tonight.

No hazardous weather is expected at this time.

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

Monday and Tuesday...
Limited Thunderstorm Risk.
Wednesday...
Hazardous conditions for small craft are likely.
Thursday and Friday...
Limited Thunderstorm Risk.

$$

Kluber

Visit us at http://weather.gov/chicago

Follow us on Facebook, Twitter, and Youtube at:
www.facebook.com/nwschicago
www.twitter.com/nwschicago
www.youtube.com/nwschicago

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

See Product Description

307
ACUS02 KWNS 251732
SWODY2
SPC AC 251730

Day 2 Convective Outlook
NWS Storm Prediction Center Norman OK
1230 PM CDT Sun Aug 25 2019

Valid 261200Z - 271200Z

...THERE IS AN ENHANCED RISK OF SEVERE THUNDERSTORMS FROM NORTHEAST
OKLAHOMA...EASTERN KANSAS INTO MISSOURI...

...SUMMARY...
Severe thunderstorms are expected Monday afternoon and evening from
the Middle Mississippi Valley region into eastern Kansas and
Oklahoma. Large hail and damaging winds should be the main threats,
though a few tornadoes are also possible.

...Synopsis...

A broad low-amplitude upper trough now situated from southwestern
Canada into the northern Rockies is forecast to undergo significant
amplification as it moves through the northern Plains and upper MS
Valley region Monday. This feature will be accompanied by a cold
front that should extend from MN, eastern KS, northwest OK into the
TX Panhandle by late tomorrow afternoon. A warm front will advance
northward reaching northern MO early in the period.

...Middle MS Valley region through eastern Kansas and Oklahoma...

Ascent with a leading vorticity maximum embedded within the
amplifying upper trough will likely contribute to a few storms early
in the period, mainly from eastern NE into IA. A few instances of
hail and locally strong wind gusts cannot be ruled out with this
activity. South of the early storms, the moistening warm sector will
become strongly unstable with low to mid 70s F dewpoints beneath
7-7.5 C/km mid-level lapse rates, and diabatic warming of the
boundary layer contributing to 3000-4000 J/kg MLCAPE. Wind profiles
will strengthen in association with the amplifying trough with 35-45
kt effective bulk shear. Storms are expected to redevelop along the
cold front, initially over northeast KS into northwest MO and move
east through MO. A broken band of storms with mixed modes including
supercells and line segments appears likely with large hail and
damaging wind. A few tornadoes may be possible especially over
northern MO where remnant boundary from early activity might augment
0-2 km storm relative helicity. Backbuilding into OK is expected as
the front continues south during the evening. Though wind profiles
will be weaker with southwestern extent into OK, the thermodynamic
environment with strong instability and steep lapse rates will
support a risk for large hail and downburst winds.

...MAXIMUM RISK BY HAZARD...
Tornado: 5% - Slight
Wind: 30% - Enhanced
Hail: 30% - Enhanced

..Dial.. 08/25/2019

$$

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

569
ACUS03 KWNS 250726
SWODY3
SPC AC 250725

Day 3 Convective Outlook
NWS Storm Prediction Center Norman OK
0225 AM CDT Sun Aug 25 2019

Valid 271200Z - 281200Z

...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS ACROSS SOUTHERN
OK AND NORTHERN TX...

...SUMMARY...
Isolated severe thunderstorms are possible across southern Oklahoma
and northern Texas on Tuesday.

...Discussion...
A large and mature mid-latitude cyclone will likely be centered near
the central Manitoba/Ontario border early Tuesday. Center of this
cyclone is expected to move eastward into far northwestern Ontario
while cyclonic flow throughout its base moves over the upper and
middle MS Valleys.

At the surface, a cold front will likely extend from the Upper Great
Lakes southeastward through the middle MS Valley and into northwest
TX. Northern portion of this front is expected to remain fairly
progressive, reaching the Lower Great Lakes, Upper OH Valley, and
middle TN Valley by Tuesday evening. Southern/western portion of the
front are expected to be less progressive with outflow from a MCS
becoming the effective boundary across southern OK/northern TX.

While thunderstorms are possible along northern portions of the
front, displacement east of the better vertical shear should
mitigate storm intensity. Warm temperatures, ample low-level
moisture, and strong convergence along the composite front should be
able to overcome the warm mid-level temperatures across southern
OK/northern TX. Environment supports a severe threat with any storms
that develop, but location of the front is uncertain, and the lack
of large-scale forcing for ascent and warm mid-level temperatures
could limit storm coverage. As such, only low severe probabilities
are introduced with this forecast.

..Mosier.. 08/25/2019

$$

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.