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Current Conditions

A message from COD Meteorology

Current Local Radar

Temperature
23°F
Feels Like:
19°F
Dew Point	Humidity
19°F	83%

Wind Strength
Light	Moderate	Strong
North at 3 mph

Local Graphical Forecast (Updated: 02/22/19 1:15 am)

Friday (2/22)
Day	Night

	20%
High	Low
39	30

Saturday (2/23)
Day	Night

70%	100%
High	Low
44	33

Sunday (2/24)
Day	Night

20%
High	Low
35	12

Monday (2/25)
Day	Night


High	Low
25	13

Tuesday (2/26)
Day	Night

30%	30%
High	Low
31	17

Wednesday (2/27)
Day	Night


High	Low
28	12

Thursday (2/28)
Day	Night


High	Low
28

Detailed Text Forecast (Updated: 02/22/19 1:15 am)

Friday Night: Partly cloudy, with a low around 18. North northeast wind around 5 mph.

Friday: Mostly sunny, with a high near 39. East wind around 5 mph.

Friday Night: A 20 percent chance of rain after 3am. Mostly cloudy, with a low around 30. East wind 5 to 10 mph.

Saturday: Rain likely before noon, then showers likely after noon. Cloudy, with a high near 44. East southeast wind 5 to 10 mph. Chance of precipitation is 70%.

Saturday Night: Rain showers before midnight, then a chance of rain between midnight and 5am, then a chance of rain and snow after 5am. Some thunder is also possible. Low around 33. Breezy, with an east southeast wind 10 to 15 mph becoming west 15 to 20 mph after midnight. Winds could gust as high as 35 mph. Chance of precipitation is 100%.

Sunday: A slight chance of rain and snow, mainly between 9am and noon. Partly sunny, with a high near 35. Breezy. Chance of precipitation is 20%.

Sunday Night: Partly cloudy, with a low around 12. Breezy.

Monday: Partly sunny, with a high near 25.

Monday Night: Mostly cloudy, with a low around 13.

Tuesday: A chance of snow. Mostly cloudy, with a high near 31.

Tuesday Night: A chance of snow. Mostly cloudy, with a low around 17.

Wednesday: Partly sunny, with a high near 28.

Wednesday Night: Mostly cloudy, with a low around 12.

Thursday: Mostly sunny, with a high near 28.

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Copyright © 2019

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SPC Convective Outlook Day 1

See Product Description

067
ACUS01 KWNS 220549
SWODY1
SPC AC 220548

Day 1 Convective Outlook
NWS Storm Prediction Center Norman OK
1148 PM CST Thu Feb 21 2019

Valid 221200Z - 231200Z

...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS FROM EAST TEXAS
INTO THE LOWER MISSISSIPPI VALLEY...

...SUMMARY...
Strong thunderstorms may impact portions of the lower Mississippi
Valley this afternoon, expanding into the ArkLaTex vicinity by late
tonight, accompanied by at least some risk for severe weather.

...Synopsis...
A strong shortwave trough over the Southwest is expected to
intensify and become negatively tilted as it moves
east-northeastward towards the Southern Plains by Saturday morning.
In response, cyclogenesis is expected in the lee of the southern
Rockies, and a cold front will begin to surge eastward into portions
of West TX late tonight. Further east, a warm front will move slowly
northward during the day across portions of east TX into the lower
Mississippi Valley, with some acceleration northward into the
ArkLaTex region late tonight as the surface low deepens to the west.

...Lower MS Valley Region...
Showers and scattered thunderstorms will likely be ongoing at the
start of the period and will continue through much of the day due to
persistent warm advection north of the warm front. While rich
low-level moisture (characterized by mid-upper 60s F dewpoints) will
spread slowly northward through the day south of the boundary,
widespread cloudiness and only modest midlevel lapse rates will tend
to limit instability, with MLCAPE likely remaining in the 500-1000
J/kg range across the warm sector. With the primary upper system and
associated large-scale ascent remaining well to the west during the
day, the greatest coverage of convection is expected to remain north
of the boundary, though there will be some potential for a few
surface-based storms during the afternoon across portions of
central/southern MS and perhaps northern LA, with an attendant risk
of marginally severe hail and locally damaging wind. While a brief
tornado cannot be ruled out with any cell that interacts with the
surface boundary, the potential for substantial surface-based
development appears too limited at this time to introduce tornado
probabilities.

Elevated convection from southeast AR into northern MS may also pose
some severe risk, especially later tonight when somewhat steeper
midlevel lapse rates begin to move in from the west as the upper
trough approaches and the surface boundary gradually moves
northward.

...ArkLaTex Region Late Tonight...
As the primary shortwave moves into the southern Plains late in the
period, elevated storms may develop across portions of eastern OK/TX
into the ArkLaTex by early Saturday morning. Steep midlevel lapse
rates and sufficient effective shear will support a conditional risk
of hail and perhaps locally damaging wind with the strongest cells,
though the coverage and southward extent of deep convection across
the region prior to the end of the period at 12Z remains uncertain
at this time.

..Dean/Squitieri.. 02/22/2019

$$

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

772
FLUS43 KLOT 212137
HWOLOT

Hazardous Weather Outlook
National Weather Service Chicago/Romeoville IL
337 PM CST Thu Feb 21 2019

ILZ003>006-008-010>014-019>023-032-033-039-INZ001-002-010-011-019-
222145-
Winnebago-Boone-McHenry-Lake IL-Ogle-Lee-DeKalb-Kane-DuPage-Cook-
La Salle-Kendall-Grundy-Will-Kankakee-Livingston-Iroquois-Ford-
Lake IN-Porter-Newton-Jasper-Benton-
337 PM CST Thu Feb 21 2019 /437 PM EST Thu Feb 21 2019/

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...Friday through Wednesday.

Friday...
Elevated Ice Accumulation Risk.
Saturday...
Limited Thunderstorm Risk.
Limited Non Thunderstorm Wind Risk.
Elevated Ice Accumulation Risk.
Sunday...
Limited Excessive Cold Risk.
Elevated Non Thunderstorm Wind Risk.
Monday through Wednesday...
Limited Excessive Cold Risk.

DISCUSSION:

A deep low pressure system will lift across the region this weekend.
There is a chance that locations north of an Evanston to Mendota line
may see freezing rain late Friday night into Saturday morning, with
light ice accumulation possible. A strong cold front will sweep across
the region Saturday night. There will be a chance for thunderstorms
Saturday ahead of the cold front. Strong west-northwest winds up to
45 mph are possible from early Sunday morning into Sunday evening
following the passage of the front.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will not be necessary through tonight.

$$

LMZ740>745-222145-
Winthrop Harbor to Wilmette Harbor-
Wilmette Harbor to Northerly Island-
Northerly Island to Calumet Harbor-Calumet Harbor to Gary-
Gary to Burns Harbor-Burns Harbor to Michigan City-
337 PM CST Thu Feb 21 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...Tonight.

No hazardous weather is expected at this time.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday.

Saturday...
Gale force winds and very hazardous waves are likely.
Limited Thunderstorm Risk.
Sunday...
Gale force winds and or very hazardous waves are likely.
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

See Product Description

172
ACUS02 KWNS 220534
SWODY2
SPC AC 220533

Day 2 Convective Outlook
NWS Storm Prediction Center Norman OK
1133 PM CST Thu Feb 21 2019

Valid 231200Z - 241200Z

...THERE IS AN ENHANCED RISK OF SEVERE THUNDERSTORMS FROM SE
AR/NORTHERN MS TO WESTERN TN...

...SUMMARY...
Scattered severe thunderstorms are expected to form along a corridor
from the lower Mississippi Valley into portions of the Tennessee
Valley. Damaging winds and tornadoes are possible.

...Lower MS Valley to TN Valley...

Late-evening water vapor imagery depicts a well-defined upper low
near the lower CO River Valley. This feature is forecast to eject
into the southern Plains by the start of the day2 period then lift
into the Mid MS Valley by mid day Saturday as an intense 500mb speed
max translates across OK into MO. Mid-level speed max will shift
into western PA by Sunday morning. Impressive 12hr 500mb height
falls will spread across the southern High Plains into MO with the
southern extent of large-scale forcing for ascent expected to glance
the ENH Risk region.

Latest model guidance suggests this low-latitude system will induce
a lee surface low over northeast NM late Friday. Surface low should
track along the KS/OK border before ejecting northeast into
southeast IA by early evening. In response to this developing
cyclone, higher-PW air mass will surge inland as a warm front lifts
across the Arklatex ahead of a surging cold front. Latest NAM
guidance is not as aggressive with destabilization from eastern OK
into KY due to a slower advancing warm front. Have adjusted northern
severe probabilities to reflect the possibility that buoyancy, and
certainly surface-based instability, may be retarded at higher
latitudes. Forecast shear profiles are impressive and supportive of
organized severe convection. At this time it appears severe
convection should evolve along the advancing cold front with
supercells possible prior to possible squall line development.
Discrete pre-frontal storms may develop which could have a
proclivity to produce tornadoes if surface-based instability
materializes as expected across the ENH risk, and surrounding areas.
Severe threat will migrate into the TN Valley and central Gulf
States during the latter half of the period. In addition to the
tornado threat, damaging winds are likely with the frontal
convection.

...MAXIMUM RISK BY HAZARD...
Tornado: 10% SIG - Enhanced
Wind: 30% - Enhanced
Hail: 15% - Slight

..Darrow.. 02/22/2019

$$

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

801
ACUS03 KWNS 220714
SWODY3
SPC AC 220713

Day 3 Convective Outlook
NWS Storm Prediction Center Norman OK
0113 AM CST Fri Feb 22 2019

Valid 241200Z - 251200Z

...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS ALONG THE
CENTRAL GULF COAST...

...SUMMARY...
A few strong storms may occur Sunday morning along the central Gulf
Coast.

...Central Gulf Coast...

Strong upper trough that ejects across the Mid MS Valley/OH Valley
region late in the day2 period will flatten heights across the
northeastern US Sunday. Associated deep surface low will lift into
QC during the day and occlude. While primary large-scale forcing for
ascent will spread well north of appreciable buoyancy, trailing
surface front is expected to provide the focus for deep convection,
especially near the Gulf Coast. The greatest risk for a few strong
storms will occur before 18z from southeast LA into the FL Panhandle
ahead of the wind shift. Model guidance suggests a narrow corridor
of pre-frontal moisture will advance inland such that near-surface
based instability could support a few strong storms along southern
fringe of stronger cyclonic flow aloft. At this time it appears
gusty winds would be the primary threat with a loosely organized
frontal squall line. Frontal convection should weaken during the
afternoon as it encounters increasingly hostile air mass downstream.

..Darrow.. 02/22/2019

$$

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.