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Current Conditions

A message from COD Meteorology

Current Local Radar

Temperature
67°F
Feels Like:
67°F
Dew Point	Humidity
54°F	63%

A Few Clouds

Wind Strength
Light	Moderate	Strong
North at 8 mph

Local Graphical Forecast (Updated: 06/13/21 5:15 am)

Sunday (6/13)
Day	Night


High	Low
87	66

Monday (6/14)
Day	Night


High	Low
83	60

Tuesday (6/15)
Day	Night


High	Low
80	56

Wednesday (6/16)
Day	Night


High	Low
79	55

Thursday (6/17)
Day	Night


High	Low
86	66

Friday (6/18)
Day	Night


High	Low
86	63

Saturday (6/19)
Day	Night


High	Low
83

Detailed Text Forecast (Updated: 06/13/21 5:15 am)

Sunday: Sunny, with a high near 87. Northeast wind 5 to 10 mph.

Sunday Night: Mostly clear, with a low around 66. Northeast wind 5 to 10 mph becoming southwest after midnight. Winds could gust as high as 15 mph.

Monday: Sunny, with a high near 83. North wind 10 to 15 mph, with gusts as high as 25 mph.

Monday Night: Mostly clear, with a low around 60. North wind 5 to 10 mph.

Tuesday: Sunny, with a high near 80. North wind 5 to 15 mph.

Tuesday Night: Clear, with a low around 56.

Wednesday: Sunny, with a high near 79.

Wednesday Night: Clear, with a low around 55.

Thursday: Sunny, with a high near 86.

Thursday Night: A chance of showers and thunderstorms, mainly after 1am. Partly cloudy, with a low around 66.

Friday: A chance of showers and thunderstorms. Mostly sunny, with a high near 86.

Friday Night: A slight chance of showers and thunderstorms. Mostly clear, with a low around 63.

Saturday: Sunny, with a high near 83.

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Copyright © 2021

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Phone: 630-942-2590
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SPC Convective Outlook Day 1

See Product Description

693
ACUS01 KWNS 130720
SWODY1
SPC AC 130718

Day 1 Convective Outlook CORR 1
NWS Storm Prediction Center Norman OK
0218 AM CDT Sun Jun 13 2021

Valid 131200Z - 141200Z

...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS ACROSS PARTS OF
THE CENTRAL APPALACHIANS...

CORRECTED FOR NDFD GRIDS

...SUMMARY...
Damaging wind gusts and marginally severe hail will be possible
across parts of the central Appalachians this afternoon and evening.
Marginally severe hail and strong wind gusts may also occur over
parts of the southern and central High Plains, and in parts of the
Upper Midwest.

...Central Appalachians...
An upper-level trough will move southeastward into the Great Lakes
region today as mid-level flow becomes west-northwesterly across
much of the Northeast. At the surface, a cold front will advance
southeastward into the central Appalachians. Ahead of the front,
surface dewpoints from the mid 60s to the lower 70s F will result in
a southwest-to-northeast corridor of moderate instability.
Thunderstorms are forecast to develop along and ahead of the front
during the late morning with these storms moving east-southeastward
across the central Appalachians during the afternoon.

In addition to moderate instability, NAM forecast soundings ahead of
the front at 21Z have 0-6 km shear in the 30 to 35 kt range. This is
due to strong speed shear located in the 700 to 300 mb layer. The
vertical shear combined with the moderate instability and steep
low-level lapse rates will be favorable for damaging wind gusts.
Although supercells will be possible, the more common storm mode
should be multicellular. Storms that can congeal together into lines
could have wind damage potential. The possibility for wind damage
will likely persist into the early evening with any cold pool that
can become established. The wind damage threat should be greatest
from West Virginia northeastward across Pennsylvania where the
combination of instability and shear is forecast to be maximized. A
few marginally severe wind gusts could also occur further southwest
into central and eastern Kentucky.

...Southern and Central High Plains...
An upper-level ridge will remain in place across the southern and
central Rockies today. To the east of the ridge, an axis of moderate
to strong instability will develop by afternoon from western Kansas
into western Nebraska. Isolated thunderstorms are expected to form
by midday on the western edge of the stronger instability in the
higher terrain of New Mexico, Colorado and Wyoming. These storms
will move eastward into the High Plains this afternoon. Although
large-scale ascent will be limited, directional shear in the low to
mid-levels and steep lapse rates may be enough for marginally severe
wind gust and hail.

...Upper Midwest...
A shortwave trough will move southeastward into the upper
Mississippi Valley today. At the surface, a low and an associated
cold front are forecast to move southeastward across central
Minnesota. Thunderstorm development is expected to occur during the
afternoon to the northeast of the surface low in northern and
central Wisconsin. This convection will be supported by strong
large-scale ascent ahead of the shortwave trough. Although
instability is forecast to remain weak, deep-layer shear should be
near 50 kt due to very strong mid-level speed shear. This along with
steep low to mid-level lapse rates could be enough for marginally
severe wind gusts and hail.

..Broyles/Moore.. 06/13/2021

$$

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 2

See Product Description

825
ACUS02 KWNS 130856
SWODY2
SPC AC 130854

Day 2 Convective Outlook RESENT 1
NWS Storm Prediction Center Norman OK
0354 AM CDT Sun Jun 13 2021

Valid 141200Z - 151200Z

...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS FROM OHIO AND
PENNSYLVANIA INTO SOUTHEAST VIRGINIA...AND OVER PARTS OF THE
NORTHERN AND CENTRAL HIGH PLAINS...

...SUMMARY...
Isolated severe storms will be possible over parts of the Mid
Atlantic and High Plains Monday.

...Synopsis...
A prominent upper ridge will remain over the Rockies with upper high
centered over the Four Corners area. Late in the period into Tuesday
morning, northwest portions of the ridge will begin to break down as
a shortwave trough moves across the Pacific Northwest, with strong
cooling aloft across WA and OR Monday night. To the east, cyclonic
flow aloft will exist over the northeastern quarter of the CONUS,
with various waves embedded within. An early disturbance will move
from NY across New England, associated with the left-front quadrant
of the upper jet. Later in the period, another wave will move from
the upper Great Lakes toward the upper OH Valley, a bit more
amplified with stronger cooling aloft.

...Mid Atlantic...
A cold front is expected to stall and weaken over the Appalachians,
with weak low pressure redeveloping from VA into the Carolinas
during the day. Mid to upper 60s F dewpoints will lead a plume of
moderate instability roughly from the eastern Carolinas into New
Jersey, and scattered storms are expected, a few of which could be
severe as deep-layer shear will be sufficient for storm longevity.
Hodographs will be straight, and will favor cells, possibly
splitting, with marginal hail or wind threat.

Lift associated with the second wave may produce storms over OH, WV,
and VA after 00Z. Some of these could be strong, and strong ascent
may compensate for minimal instability with mainly a wind threat.

...Northern and central High Plains...
A plume of 50s to near 60 F dewpoints will extend from southeast MT
into the central High Plains as southeast surface winds persist.
Strong heating beneath the upper ridge will steepen lapse rates,
with widely-spaced storms possible by late afternoon, forming on the
elevated terrain. Localized hail or wind damage will be possible
with these storms as they proceed southeastward, possibly through
the evening as elevated instability remains substantial.

Farther south, the environment will remain favorable for severe
storms across western KS, OK/TX Panhandles, provided elevated warm
advection can instigate storms. Lapse rates aloft will be steep and
700 mb moisture may yield storms capable of hail. Several CAMs
support this possibility, but overall the threat is conditional.

..Jewell.. 06/13/2021

$$

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

980
ACUS03 KWNS 130727
SWODY3
SPC AC 130726

Day 3 Convective Outlook
NWS Storm Prediction Center Norman OK
0226 AM CDT Sun Jun 13 2021

Valid 151200Z - 161200Z

...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS OVER PARTS OF
THE MID ATLANTIC...

...SUMMARY...
A few severe storms are possible Tuesday across the eastern
Carolinas and southeast Virginia.

...Mid Atlantic...
A shortwave trough embedded within the large-scale cyclonic flow
regime is forecast to move from the OH Valley into VA, providing
cooling aloft. Meanwhile, a moist and unstable air mass is expected
to exist ahead of a cold front that will move across southeast VA
and NC during the day. Modest deep-layer shear on the order of 35-40
kt and primarily straight hodographs will favor a hail and wind
threat. Model timing differs on frontal position and wave speed,
thus only 5% probabilities are in effect.

....Northern ID and MT...eastern WA...
A strong shortwave trough will move across the Pacific Northwest on
Tuesday, with primary height falls from OR into western MT. A cold
front is expected to rapidly move east across ID and MT during the
day, outpacing the cooling aloft. Models depict little if any
thunderstorms activity along this front given the rapid drying. It
appears likely that a plume of instability will exist over far
eastern MT ahead of the front, and this may support at least
isolated afternoon/evening storms. Trends will continue to be
monitored for possible low probabilities in later outlooks.

..Jewell.. 06/13/2021

$$

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.