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Current Conditions

A message from COD Meteorology

Current Local Radar

Temperature
69°F
Feels Like:
69°F
Dew Point	Humidity
55°F	61%

Overcast

Wind Strength
Light	Moderate	Strong
Northeast at 6 mph

Local Graphical Forecast (Updated: 07/30/21 6:15 pm)

Friday (7/30)
Day	Night


High	Low
	61

Saturday (7/31)
Day	Night

	30%
High	Low
80	65

Sunday (8/1)
Day	Night


High	Low
77	58

Monday (8/2)
Day	Night


High	Low
76	58

Tuesday (8/3)
Day	Night


High	Low
80	61

Wednesday (8/4)
Day	Night


High	Low
83	63

Thursday (8/5)
Day	Night


High	Low
84	66

Detailed Text Forecast (Updated: 07/30/21 6:15 pm)

Friday Night: A chance of sprinkles before 11pm. Mostly cloudy, with a low around 61. East northeast wind 5 to 10 mph becoming light and variable in the evening.

Saturday: Widespread haze after 1pm. Mostly sunny, with a high near 80. Light west wind increasing to 5 to 10 mph in the morning.

Saturday Night: A 30 percent chance of showers and thunderstorms, mainly before 1am. Widespread haze. Partly cloudy, with a low around 65. West wind 5 to 10 mph.

Sunday: Widespread haze before 1pm. Mostly sunny, with a high near 77. North wind around 10 mph, with gusts as high as 20 mph.

Sunday Night: Mostly clear, with a low around 58. North northeast wind 5 to 10 mph.

Monday: Mostly sunny, with a high near 76.

Monday Night: Mostly clear, with a low around 58.

Tuesday: Sunny, with a high near 80.

Tuesday Night: Mostly clear, with a low around 61.

Wednesday: Sunny, with a high near 83.

Wednesday Night: Mostly clear, with a low around 63.

Thursday: Mostly sunny, with a high near 84.

Thursday Night: Partly cloudy, with a low around 66.

Friday: A slight chance of showers. Mostly sunny, with a high near 85.

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SPC Convective Outlook Day 1

See Product Description

494
ACUS01 KWNS 302001
SWODY1
SPC AC 301959

Day 1 Convective Outlook
NWS Storm Prediction Center Norman OK
0259 PM CDT Fri Jul 30 2021

Valid 302000Z - 311200Z

...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS CENTRAL/EASTERN NE
TO SOUTHWEST IA AND NORTHWEST MO...

...SUMMARY...
A couple tornadoes along with scattered damaging winds and large
hail are possible across portions of the central Great Plains to the
Lower Missouri Valley from late afternoon into tonight.

...Discussion...
No change was made to the previous convective outlook.

..Smith.. 07/30/2021

.PREV DISCUSSION... /ISSUED 1128 AM CDT Fri Jul 30 2021/

...Central Great Plains and Lower MO Valley...
Late afternoon to evening thunderstorm development will be focused
along and north of a quasi-stationary front arcing from northeast CO
to central NE to southwest MO. The temperature and dew point
gradient will be largest in the NE portion of the baroclinic zone.
Here, organized severe storms should initiate along a corridor of
moderate to large buoyancy supported by upper 60s to mid 70s
boundary-layer dew points. Initial storms in the central NE vicinity
will be on the fringe of modest deep-layer westerlies (with stronger
flow east; weaker west). This should tend to foster mainly
outflow-dominated cells. However, convection will likely intensify
as it spreads towards eastern NE this evening with effective shear
around 40 kts. Although lower-level lapse rates should progressively
weaken with northern extent from the surface boundary, enlargement
to the low-level hodograph may yield a couple tornadic storms prior
to broader clustering of convection that spreads east-southeast.
Regenerative warm-advection-driven storms should persist across the
Mid to Lower MO Valley through much of the night, although the
overall severe threat will gradually subside during late evening to
early morning as instability diminishes.

...Southeast VA and central/eastern NC...
A southeast-sagging cold front should be the focus for at least
isolated thunderstorms later this afternoon. In the mid-levels,
relatively warm temperatures and weak lapse rates will be limiting
factors, as well as drier air spreading from west to east. A
moderate buoyancy plume should still develop along the coastal plain
where boundary-layer dew points will be largest. With
west-southwesterly low-level flow, moderate speed shear through the
cloud-bearing layer should foster mainly cellular convection capable
of small hail. This should augment downdraft strength and yield a
threat for locally damaging winds from sporadic downbursts.

$$

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

100
ACUS02 KWNS 301723
SWODY2
SPC AC 301722

Day 2 Convective Outlook
NWS Storm Prediction Center Norman OK
1222 PM CDT Fri Jul 30 2021

Valid 311200Z - 011200Z

...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS EASTERN KANSAS
EAST INTO THE LOWER OHIO VALLEY...AND PARTS OF WISCONSIN...

...SUMMARY...
Marginally severe thunderstorms will be possible Saturday centered
over Missouri and Wisconsin.

...Synopsis...
A broad region of cyclonic flow aloft will remain over the
northeastern quarter of the CONUS, with various embedded waves. One
disturbance is forecast to move from the mid MS Valley to KY/WV by
early evening. A cold front will progress southward across KS and
much of MO during the day with the eastern portion of the frontal
zone becoming stationary over the lower OH Valley. Farther north, a
series of weak disturbances will move southeastward across the
western Great Lakes during the period. A surface trough will move
southward across the western Great Lakes and focus
shower/thunderstorm development during the afternoon/early evening.

...MO and Vicinity...
Showers/thunderstorms will likely be ongoing Saturday morning across
the lower MO Valley. A threat for strong to locally severe storms
may accompany this thunderstorm activity during the morning as
warm/moist advection weakens during the morning. It seems plausible
additional storms will preferentially develop on the leading edge of
earlier-day outflow, primarily from midday onward. Modest flow
fields will favor southeastward-moving storms with an isolated risk
for damaging gusts. Isolated large hail could accompany the
strongest updrafts.

...WI and Vicinity...
Lapse rates will steepen throughout the day with weak surface
convergence and low 60s F dewpoints. MLCAPE up to 1000 J/kg may
develop, beneath northwest flow aloft. Scattered storms are
forecast after 21Z from eastern MN across WI and into Lower MI, with
around 40 kt deep-layer shear. This may favor cellular storm mode
capable of marginal hail or strong/damaging gusts. The activity
will likely diminish by late evening as instability wanes.

..Smith.. 07/30/2021

$$

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

270
ACUS03 KWNS 300726
SWODY3
SPC AC 300725

Day 3 Convective Outlook
NWS Storm Prediction Center Norman OK
0225 AM CDT Fri Jul 30 2021

Valid 011200Z - 021200Z

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

...SUMMARY...
A few storms may become severe Sunday over parts of the eastern
Carolinas and Virginia.

...Synopsis...
Cyclonic flow aloft will persist over the Great Lakes and Northeast,
with an upper speed max over WI Sunday morning. This feature will
move across OH and into PA by late afternoon, providing cooling
aloft and increased deep-layer shear. Meanwhile, a leading
low-amplitude wave will move east across VA and NC, with 500 mb
speeds of 40-50 kt.

At the surface, lows will exist over eastern VA/NC, and near Lake
Ontario during the afternoon. A cold front will extend southwest
from the Mid Atlantic low into northern TX. Ahead of this front,
ample moisture and instability will exist with MUCAPE commonly in
the 2000-3000 J/kg range.

Meanwhile, only a few hundred J/kg MUCAPE is expected to develop
near the northern low where dewpoints will average in the 50s to
lower 60s F but beneath cooler temperatures aloft. While mid-high
level winds will be strongest across the Northeast, winds below 700
mb will be relatively weak.

Elsewhere, an upper high will be centered over the Four Corners
states with ridge extending north into Alberta, with scattered
daytime storms over the West.

...Eastern VA and NC...
Mid to upper 70s F dewpoints will exist ahead of a cold front,
resulting in strong instability and zero CIN for much of the day.
Surface convergence will be sufficient along a cold front and near
the weak low, with scattered storms possible. Some models indicate
substantial early day storms over VA and western NC, with varying
degrees of diurnal storm coverage thereafter. Therefore, while shear
and instability may conditionally favor severe storms, enough
uncertainty exists at this time range to defer greater probabilities
to later updates as needed.

...Northeast...
Moisture will be meager for this time of year ahead of the cold
front which will move across OH and into western PA and NY prior to
00Z. In addition, surface temperatures will only average in the 70s
F, resulting in weak lapse rates. Furthermore, weak winds will exist
below 700 mb. Therefore, while scattered showers and thunderstorms
are expected, the probability of severe storms appears low.

..Jewell.. 07/30/2021

$$

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.