Severe Thunderstorm Warning 68, NWS Chicago, IL

075 
WWUS53 KLOT 110246
SVSLOT

Severe Weather Statement
National Weather Service Chicago/Romeoville
946 PM CDT Tue Aug 10 2021

INC073-089-111-127-110345-
/O.CON.KLOT.SV.W.0068.000000T0000Z-210811T0345Z/
Newton IN-Porter IN-Lake IN-Jasper IN-
946 PM CDT Tue Aug 10 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1045 PM CDT
FOR NORTHERN NEWTON...SOUTHERN PORTER...SOUTHERN LAKE AND JASPER
COUNTIES...

At 945 PM CDT, a severe thunderstorm was located over Roselawn, or 
miles west of DeMotte, moving east at 45 mph. The most severe winds 
are likely to reach DeMotte by 10 PM CDT.

HAZARD...70 mph wind gusts and quarter size hail.

SOURCE...Radar indicated.

IMPACT...Hail damage to vehicles is expected. Expect considerable 
         tree damage. Wind damage is also likely to mobile homes, 
         roofs, and outbuildings.

Locations impacted include...
Rensselaer, DeMotte, Hebron, Wheatfield, Lake Village, Roselawn,
Kouts, Shelby, Hanging Grove, Schneider, Sumava Resorts, Thayer,
Baileys Corner, Stoutsburg, Fair Oaks, Parr and Dunns Bridge.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

Continuous cloud to ground lightning is occurring with this storm.
Move indoors immediately. Lightning is one of nature's leading
killers. Remember, if you can hear thunder, you are close enough to
be struck by lightning.

Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4102 8753 4124 8753 4139 8693 4091 8693
TIME...MOT...LOC 0245Z 264DEG 38KT 4114 8727 

THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...70 MPH

$$

FRIEDLEIN

657 
WWUS53 KLOT 110254
SVSLOT

Severe Weather Statement
National Weather Service Chicago/Romeoville
954 PM CDT Tue Aug 10 2021

INC073-089-111-127-110345-
/O.CON.KLOT.SV.W.0068.000000T0000Z-210811T0345Z/
Newton IN-Porter IN-Lake IN-Jasper IN-
954 PM CDT Tue Aug 10 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1045 PM CDT
FOR NORTHERN NEWTON...SOUTHERN PORTER...SOUTHEASTERN LAKE AND JASPER
COUNTIES...

At 953 PM CDT, a line of severe thunderstorms was located from near 
DeMotte to near Fair Oaks, moving east at 45 mph.

HAZARD...70 mph wind gusts and quarter size hail.

SOURCE...Radar indicated.

IMPACT...Hail damage to vehicles is expected. Expect considerable 
         tree damage. Wind damage is also likely to mobile homes, 
         roofs, and outbuildings.

Locations impacted include...
Rensselaer, DeMotte, Hebron, Wheatfield, Lake Village, Roselawn,
Kouts, Shelby, Hanging Grove, Schneider, Sumava Resorts, Thayer,
Baileys Corner, Stoutsburg, Fair Oaks, Parr and Dunns Bridge.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

Continuous cloud to ground lightning is occurring with this storm.
Move indoors immediately. Lightning is one of nature's leading
killers. Remember, if you can hear thunder, you are close enough to
be struck by lightning.

Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4102 8753 4115 8753 4129 8733 4139 8693
      4091 8693
TIME...MOT...LOC 0253Z 264DEG 40KT 4115 8720 

THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...70 MPH

$$

FRIEDLEIN

393 
WWUS53 KLOT 110304
SVSLOT

Severe Weather Statement
National Weather Service Chicago/Romeoville
1004 PM CDT Tue Aug 10 2021

INC073-089-111-127-110345-
/O.CON.KLOT.SV.W.0068.000000T0000Z-210811T0345Z/
Newton IN-Porter IN-Lake IN-Jasper IN-
1004 PM CDT Tue Aug 10 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1045 PM CDT
FOR NORTHERN NEWTON...SOUTHERN PORTER...SOUTHEASTERN LAKE AND JASPER
COUNTIES...

At 1002 PM CDT, a line of severe thunderstorm was located from near 
Wheatfield to 5 miles north of Rensselaer, moving east at 45 mph. 
This storm downed at least one large tree on the Newton and Jasper 
County border.

HAZARD...70 mph wind gusts and quarter size hail.

SOURCE...Law enforcement.

IMPACT...Hail damage to vehicles is expected. Expect considerable 
         tree damage. Wind damage is also likely to mobile homes, 
         roofs, and outbuildings.

Locations impacted include...
Rensselaer, DeMotte, Hebron, Wheatfield, Lake Village, Roselawn,
Kouts, Hanging Grove, Sumava Resorts, Thayer, Baileys Corner,
Stoutsburg, Fair Oaks, Parr and Dunns Bridge.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

Continuous cloud to ground lightning is occurring with this storm.
Move indoors immediately. Lightning is one of nature's leading
killers. Remember, if you can hear thunder, you are close enough to
be struck by lightning.

Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4102 8753 4115 8753 4118 8734 4129 8724
      4133 8716 4139 8693 4091 8693
TIME...MOT...LOC 0302Z 264DEG 40KT 4116 8706 

THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...70 MPH

$$

FRIEDLEIN

892 
WWUS53 KLOT 110320
SVSLOT

Severe Weather Statement
National Weather Service Chicago/Romeoville
1020 PM CDT Tue Aug 10 2021

INC089-127-110326-
/O.CAN.KLOT.SV.W.0068.000000T0000Z-210811T0345Z/
Porter IN-Lake IN-
1020 PM CDT Tue Aug 10 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHERN PORTER AND
SOUTHEASTERN LAKE COUNTIES IS CANCELLED...
    
The severe thunderstorm which prompted the warning has moved out of 
the warned area. Therefore, the warning has been cancelled. 
Additional thunderstorms are possible overnight.

A Severe Thunderstorm Watch remains in effect until 200 AM CDT for
northeastern Illinois...and northwestern Indiana.

LAT...LON 4102 8753 4109 8753 4120 8727 4123 8698
      4122 8697 4123 8693 4091 8693
TIME...MOT...LOC 0316Z 264DEG 40KT 4115 8719 

$$

INC073-111-110345-
/O.CON.KLOT.SV.W.0068.000000T0000Z-210811T0345Z/
Newton IN-Jasper IN-
1020 PM CDT Tue Aug 10 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1045 PM CDT
FOR NORTHERN NEWTON AND JASPER COUNTIES...

At 1016 PM CDT, a severe thunderstorm was located near Bailey's 
Corner, moving east at 45 mph. Additional thunderstorms were 
developing to the west of this storm. This storm downed at least one 
large tree on the Newton and Jasper County border.

HAZARD...70 mph wind gusts and quarter size hail.

SOURCE...Law enforcement.

IMPACT...Hail damage to vehicles is expected. Expect considerable 
         tree damage. Wind damage is also likely to mobile homes, 
         roofs, and outbuildings.

Locations impacted include...
Rensselaer, DeMotte, Wheatfield, Lake Village, Roselawn, Hanging
Grove, Fair Oaks, Parr, Baileys Corner, Stoutsburg, Thayer and Dunns
Bridge.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

Continuous cloud to ground lightning is occurring with this storm.
Move indoors immediately. Lightning is one of nature's leading
killers. Remember, if you can hear thunder, you are close enough to
be struck by lightning.

Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4102 8753 4109 8753 4120 8727 4123 8698
      4122 8697 4123 8693 4091 8693
TIME...MOT...LOC 0316Z 264DEG 40KT 4115 8719 

THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...70 MPH

$$

FRIEDLEIN

603 
WWUS53 KLOT 110328
SVSLOT

Severe Weather Statement
National Weather Service Chicago/Romeoville
1028 PM CDT Tue Aug 10 2021

INC111-110337-
/O.CAN.KLOT.SV.W.0068.000000T0000Z-210811T0345Z/
Newton IN-
1028 PM CDT Tue Aug 10 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHERN NEWTON COUNTY IS
CANCELLED...
    
The severe thunderstorm which prompted the warning has moved out of 
the warned area. Therefore, the warning has been cancelled.

A Severe Thunderstorm Watch remains in effect until 200 AM CDT for
northwestern Indiana.

LAT...LON 4097 8724 4109 8722 4121 8693 4091 8693
TIME...MOT...LOC 0327Z 264DEG 38KT 4105 8696 

$$

INC073-110345-
/O.CON.KLOT.SV.W.0068.000000T0000Z-210811T0345Z/
Jasper IN-
1028 PM CDT Tue Aug 10 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1045 PM CDT
FOR CENTRAL JASPER COUNTY...

At 1027 PM CDT, a severe thunderstorm was located near Bailey's 
Corner, or 10 miles south of Wheatfield, moving east at 45 mph.

HAZARD...70 mph wind gusts and quarter size hail.

SOURCE...Law enforcement.

IMPACT...Hail damage to vehicles is expected. Expect considerable 
         tree damage. Wind damage is also likely to mobile homes, 
         roofs, and outbuildings.

Locations impacted include...
Rensselaer, Hanging Grove, Baileys Corner and Parr. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

Continuous cloud to ground lightning is occurring with this storm.
Move indoors immediately. Lightning is one of nature's leading
killers. Remember, if you can hear thunder, you are close enough to
be struck by lightning.

Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4097 8724 4109 8722 4121 8693 4091 8693
TIME...MOT...LOC 0327Z 264DEG 38KT 4105 8696 

THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...70 MPH

$$

FRIEDLEIN

142 
WWUS53 KLOT 110343
SVSLOT

Severe Weather Statement
National Weather Service Chicago/Romeoville
1043 PM CDT Tue Aug 10 2021

INC073-110353-
/O.EXP.KLOT.SV.W.0068.000000T0000Z-210811T0345Z/
Jasper IN-
1043 PM CDT Tue Aug 10 2021

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL JASPER COUNTY WILL
EXPIRE AT 1045 PM CDT...
        
The storm which prompted the warning has moved out of the area.
Therefore, the warning will be allowed to expire.

A Severe Thunderstorm Watch remains in effect until 200 AM CDT for
northwestern Indiana.

LAT...LON 4097 8724 4109 8722 4121 8693 4091 8693
TIME...MOT...LOC 0343Z 260DEG 37KT 4108 8676 

$$

FRIEDLEIN

Area Forecast Discussion
National Weather Service Chicago/Romeoville, IL
630 PM CDT Tue Aug 10 2021

.SHORT TERM...
245 PM CDT

Through Wednesday Morning...

As anticipated, thunderstorms are erupting within two areas in
Iowa - the first near a subtle mesoscale convective vortex just
north of the IA/MO state line, and the second along a northwestern
wind shift in northeastern Iowa. The storms have been explosive
in growth, as evident by one storm producing 1" hail report within
15 minutes of the the first lightning strike. Such behavior is
not surprising given extreme instability in place, with surface
dew points in the lower 80s(!), surface temperatures in the upper
80s to lower 90s, and mid-level lapse rates of 8.3 K/km supporting
RAP-analyzed MLCAPE of 4500-5000 J/kg. While deep-layer shear will
remain less than we normally expect for organized severe weather
episodes, extreme instability often "picks up the slack."

Accordingly, any storm that develops today will almost certainly
become severe with a threat for all severe hazards (damaging hail,
destructive winds, and brief tornadoes). The greatest threat
appears to be damaging winds strong enough to uproot trees given
such extreme instability but weak shear (e.g. top-heavy cores as
well as potential to "grow upscale" via the amalgamation of beefy
cold pools). We already see signs of an organized line developing
in northeastern Iowa, which itself may turn east to southeast
into northern Illinois this evening. Finally, while low-level
shear will be less than yesterday, plentiful low-level moisture as
well as extreme low-level stretching potential will nevertheless
keep the threat for tornadoes present, albeit favoring brief
touchdowns rather than those that carry long tracks. The timeframe
of greatest concern remains 6 to 11 PM CDT.

Tonight through Wednesday morning, a stout 35-40 kt 850 mb low-
level jet will develop and point into eastern Iowa and northern
Illinois atop a convectively-generated outflow boundary. Depending
on where the boundary stalls tonight (e.g. where will LFCs be
breached?), regenerating thunderstorms are likely somewhere in the
Lower Great Lakes. Where storms to redevelop, concern is high
that an axis of hefty rainfall totals and hence flash flooding
will occur considering ample instability to take advantage of
PWATs > 2". In these situation, total rainfall amounts can easily
exceed 6 inches. Confidence in exactly where such rainfall totals
may occur, however, remains low. If you had to twist our arms,
we'd say areas along and south of a line from Dixon to Kankakee
have the highest threat for flash flooding tonight into Wednesday
morning (looking at midnight to 10 AM or so).

One final note - heat index values are currently 105 to 110
across the area. Take frequent breaks and stay hydrated if
outdoors.

Borchardt

&&

.LONG TERM...
334 PM CDT

Wednesday afternoon and Wednesday night...

The forecast for Wednesday is repeat of Tuesday, with concerns again
centering on heat and thunderstorms in the warm, moist and unsettled
weather pattern.

Following morning convection in the region, it appears the early to
mid afternoon will be a period of drying/subsidence ahead of
stronger mid level flow and an approaching cold front. Forecasted
925 mb temperatures and surface dewpoints look to be just a tad
lower than today. Having widespread 105-110 heat indices today, feel
like while we look to take a tip downward and may have lingering
cloud cover, the several days of uncomfortable weather support
another Heat Advisory Wednesday afternoon.

Concern will then shift to the longwave trough over the upper
Midwest that will steer a cold front toward the upper/mid
Mississippi Valley late Wednesday. Convective initiation is likely
along the front in another extremely buoyant airmass. It is still
unclear on the convective coverage, but it seems favorable that this
activity will again approach the local area late afternoon and
evening. This would support a higher end wind threat should factors
come together, and this will be a period to watch.

The front will not fly on through, therefore we will need to watch
for additional training thunderstorms Wednesday night which will
pose a flooding threat.

KMD

Thursday through Monday...Previous forecast discussion
unchanged...Capping will remain a limiting factor in convective
coverage on Thursday as larger-scale forcing will be confined to the
mid-level wave brushing the area. However, modest deep layer shear
up to 25 knots within a highly unstable environment conditional upon
breaking the cap warrants chance PoPs and a mention of severe storm
potential through most of this period. This is particularly the case
Thursday afternoon across the south half of the CWA.

South of the boundary on Thursday, very humid conditions will
persist, with afternoon heat index values possibly surpassing 100F.

Thursday night and Friday: A slow-moving cold front will shift south
across the forecast area, with convective potential at any given
time mainly tied to the location of the front. Guidance has slowed
the progression of the front, resulting in the introduction of low
chance of thunderstorms across the south half of the CWA through the
day (but especially the afternoon) on Friday. Drier profiles behind
Thursday's potential storms reduces afternoon heat concerns as well
as coverage of storms.

Saturday through Monday: High pressure will build across the region
through the weekend and into early next week, bringing dry weather
along with cooler and much less humid conditions.

Kluber

&&

.AVIATION...
For the 00Z TAFs...

630 PM...Primary forecast concern is thunderstorm chances this
evening, Wednesday morning and again Wednesday afternoon/evening.

A line of thunderstorms will move across northern IL and the
terminals over the next few hours. Wind gusts in the 30-40kt range
will be possible with these storms along with ifr cigs/vis with
heavy rain. Isolated thunderstorms will be possible ahead of the
line of storms. Trends become uncertain for thunderstorms
overnight into Wednesday morning. Its possible that new convection
will develop further south across central IL tonight and may
remain generally south of the terminals into Wednesday morning.
Given low confidence, opted to maintain current prob mention for
now. A lull is expected from late morning through mid afternoon
and then there will be another period of possible thunderstorms
from late afternoon across northwest IL through mid evening across
the Chicago terminals. There seems to be a consensus from the
models for this time period and opted to include prob mention with
this forecast.

Other concerns will be gusty south/southwest winds this evening
and again Wednesday. Some mvfr cigs will be possible at times, but
confidence too low to include with this forecast. cms

&&

.LOT WATCHES/WARNINGS/ADVISORIES...
IL...Heat Advisory...ILZ003-ILZ004-ILZ005-ILZ006-ILZ008-ILZ010-ILZ011-
     ILZ012-ILZ013-ILZ019-ILZ020-ILZ021-ILZ023-ILZ032-ILZ033-
     ILZ039-ILZ103-ILZ104-ILZ105-ILZ106-ILZ107-ILZ108 until 7 PM
     Tuesday.

     Heat Advisory...ILZ003-ILZ004-ILZ005-ILZ006-ILZ008-ILZ010-ILZ011-
     ILZ012-ILZ013-ILZ019-ILZ020-ILZ021-ILZ023-ILZ032-ILZ033-
     ILZ039-ILZ103-ILZ104-ILZ105-ILZ106-ILZ107-ILZ108...noon
     Wednesday to 7 PM Wednesday.

IN...Heat Advisory...INZ001-INZ002-INZ010-INZ011-INZ019 until 7 PM
     Tuesday.

     Heat Advisory...INZ001-INZ002-INZ010-INZ011-INZ019...noon
     Wednesday to 7 PM Wednesday.

LM...None.
&&

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Hazardous Weather Outlook
National Weather Service Chicago/Romeoville IL
309 PM CDT Tue Aug 10 2021

ILZ003>006-008-010>013-019>021-023-032-033-039-103>108-INZ001-002-
010-011-019-112015-
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-
309 PM CDT Tue Aug 10 2021 /409 PM EDT Tue Aug 10 2021/

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

.DAY ONE...Tonight.

Weather hazards expected...

  Elevated Thunderstorm Risk...with an associated:
     Limited Tornado risk.
     Limited hail risk...up to 1 inch in diameter.
     Elevated damaging wind risk...up to 70.
  Limited Flooding Risk.
  Significant Excessive Heat Risk.

DISCUSSION...

Thunderstorms developing across eastern Iowa and will track
across the area this evening. Each storm will be capable of
producing winds strong enough to uproot trees, damaging hail,
brief tornadoes, and torrential downpours. The primary
thunderstorm threat will be between 6 and 11 PM CDT.

Dangerous heat will continue this afternoon with heat related
illness probable after 30 minutes of being in direct sunlight.

Additional thunderstorms may develop after midnight and produce
torrential downpours with a threat for flash flooding. At this
point, it appears such renewed thunderstorms will be south of
Interstate 80.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday.

Wednesday...
  Limited Severe Thunderstorm Risk.
  Elevated Excessive Heat Risk.
  Limited Non Thunderstorm Wind Risk.
Thursday...
  Limited Severe Thunderstorm Risk.
  Elevated Excessive Heat Risk.
Friday...
  Elevated Thunderstorm Risk.

DISCUSSION:

Warm and humid conditions will persist Wednesday and Thursday,
with afternoon heat indices possibly surpassing 105 F during the
afternoon.

Another round of strong to severe storms may occur Wednesday
evening.

.SPOTTER INFORMATION STATEMENT...

 Spotters may be needed this evening and overnight.

GENERAL STORM MOTION OF THE DAY:

 Moving toward the east at 40 mph.

LMZ740>745-112015-
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-
309 PM CDT Tue Aug 10 2021

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.

Weather hazards expected...

  Elevated Thunderstorm Risk...with an associated:
     Limited hail risk...up to 1 inch in diameter.
     Limited thunderstorm wind gust risk...up to 60 kt.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday.

Wednesday...
  Hazardous conditions for small craft may occur.
  Limited Severe Thunderstorm Risk.
Thursday...
  Limited Severe Thunderstorm Risk.
Friday...
  Limited Thunderstorm Risk.

Borchardt

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PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO IL
838 PM CDT TUE AUG 10 2021

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0815 PM     FLOOD            1 N ARCHER HTS. - CHICA 41.82N 87.72W
08/10/2021                   COOK               IL   PUBLIC

            NUMEROUS PUBLIC REPORTS OF WATER ON PORTIONS
            OF I-55 NEAR PULASKI ROAD.

&&

WSL

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO IL
902 PM CDT TUE AUG 10 2021

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0755 PM     TSTM WND DMG     ROGERS PARK - CHICAGO   42.01N 87.67W
08/10/2021                   COOK               IL   PUBLIC

            PHOTO SHARED VIA SOCIAL MEDIA OF LARGE
            BRANCH BLOCKING ROADWAY IN ROGERS PARK,
            CHICAGO. TIME ESTIMATED BY RADAR.

&&

WSL

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO IL
907 PM CDT TUE AUG 10 2021

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0753 PM     TSTM WND DMG     2 NNW SHOREWOOD         41.54N 88.22W
08/10/2021                   WILL               IL   PUBLIC

            REPORT OF DOWNED TREE BRANCHES ON SOUTH
            RIVER ROAD IN PLAINFIELD. TIME ESTIMATED BY
            RADAR.

&&

WSL

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO IL
910 PM CDT TUE AUG 10 2021

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0750 PM     TSTM WND DMG     1 SSW WILMETTE          42.06N 87.73W
08/10/2021                   COOK               IL   PUBLIC

            PHOTOS SHARED TO SOCIAL MEDIA SHOW BRANCHES
            DOWNED NEAR HARRISON STREET AND PROSPECT
            AVENUE IN EVANSTON. TIME ESTIMATED BY RADAR.

&&

WSL

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO IL
914 PM CDT TUE AUG 10 2021

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0830 PM     TSTM WND GST     GARY AIRPORT            41.62N 87.41W
08/10/2021  M58 MPH          LAKE               IN   AWOS

            TIME ESTIMATED BY RADAR.

&&

Special Weather Statement
National Weather Service Chicago/Romeoville
922 PM CDT Tue Aug 10 2021

ILZ023-032-033-039-INZ001-002-010-011-110315-
Livingston IL-Iroquois IL-Kankakee IL-Ford IL-Porter IN-Newton IN-
Jasper IN-Lake IN-
922 PM CDT Tue Aug 10 2021

...Strong thunderstorms will impact portions of east central
Livingston, Kankakee, north central Ford, northern Iroquois,
northern Newton, southern Porter, southern Lake and northern Jasper
Counties through 1015 PM CDT...

At 921 PM CDT, Doppler radar was tracking a line of strong
thunderstorms from east of Pontiac, to east of Kankakee, to
Valparaiso, moving east at 30 mph.

HAZARD...Wind gusts up to 50 mph and nickel size hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor damage to outdoor objects is
         possible.

Locations impacted include...
Valparaiso, Kankakee, Bourbonnais, Bradley, Lowell, DeMotte, Hebron,
Momence, Gilman, Herscher, Clifton, Morocco, Wheatfield, Lake
Village, Lakes of the Four Seasons, Winfield, Roselawn, Kouts,
Limestone and Lake Dalecarlia.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

Torrential rainfall is also occurring with this storm and may lead to
localized flooding. Do not drive your vehicle through flooded
roadways.

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

A Severe Thunderstorm Watch remains in effect until 200 AM CDT for
northeastern Illinois...and northwestern Indiana.

&&

LAT...LON 4075 8794 4077 8852 4091 8850 4119 8789
      4139 8724 4152 8693 4108 8693
TIME...MOT...LOC 0221Z 271DEG 25KT 4107 8779

MAX HAIL SIZE...0.88 IN
MAX WIND GUST...50 MPH

FRIEDLEIN