Damaging Winds in Illinois, August 11 to 12, 2021

Name: Damaging Winds in Illinois, August 11 to 12, 2021
Start: 2021-08-11T20:38
End: 2021-08-12T01:31
Location: Illinois

August 11 to 12, 2021 · NWS LOT · 5 events in 3 counties and zones

Scattered thunderstorms moved across portions of northern Illinois during the late evening of August 11th into the early morning of August 12th producing scattered wind damage.

Where it happened

Every event with a place to put it. Tap one for its entry below.

Tornadoes
Tropical storms and surge
Floods
Wind
Hail
Winter weather
Heat and drought
Cold
Fire, smoke and dust
Marine and coastal
Other

Open the live radar over this ground

The toll

Deaths: 0
Injuries: 0
Property damage: None recorded
Crop damage: None recorded
Events: 5

Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.

What happened

The episode as NWS LOT wrote it up.

Scattered thunderstorms moved across portions of northern Illinois during the late evening of August 11th into the early morning of August 12th producing scattered wind damage.

What forecasters said that day

The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Chicago, IL wrote its last area forecast discussion before the first event at Aug 11, 6:49 PM CST, 1 hour 49 minutes earlier.

Area forecast discussion, Aug 11, 6:49 PM CST, 1 hour 49 minutes before

Area Forecast Discussion...UPDATED
National Weather Service Chicago/Romeoville, IL
749 PM CDT Wed Aug 11 2021

.MESOSCALE DISCUSSION...
748 PM CDT

We are monitoring convective trends closely north of I-80 early
this evening. In summary, we do think scattered storms will
gradually uptick in the area, though confidence of overall
evolution and severe threat coverage remains on the lower side.

Gusty southwest winds since mid-afternoon have helped replenish
the low-level moisture over the area, with widespread 77+ dew
points spreading northeast over the area, replacing the
convectively-scoured air mass from earlier today. Temperatures
moderated as well although not enough thus far to overcome a cap
as captured on the 00Z DVN and ILX soundings, and as shown by
stratocumulus that developed across a good portion of north
central Illinois late this afternoon. In the past hour, there have
been updrafts to poke up from this stratocumulus, but have not
been any more than showers as of 745 PM.

This is a tricky one for this evening, because that cap may
continue to hold convective attempts for an hour or two more,
especially given how activity along the cold front in southwest
Wisconsin and northeast Iowa gradually weakened as it approached
the area. However, synoptically and kinematically the atmosphere
is fairly potent for severe weather, with a 1004 mb low in central
Wisconsin, a recovering, very moist air low-level air mass into
the region, and a strong low-level jet that is steadily increasing
(2 km flow of 45 kt on the KLOT VWP with >250 m2/s2).

While ahead of the incoming slow-moving cold front will be the
main focus, there is general moist advection atop the area that is
triggering the current isolated showers. We do expect at least
ahead of the front that there will be isolated to scattered storms
with more of a semi-discrete behavior given the orthogonal shear
to the boundary. Based on earlier convective behavior and deep
layer shear of 25-35 kt and especially the 0-1 km shear of 25 kt,
there is decent potential for supercell like behavior in any
discrete storms that can mature. This mid to late evening time in
the summer also presents some conditional threat for a tornado or
two with the low-level jet at its maximum. Otherwise, scattered
severe downburst winds, and large hail (due to a large area of 8.5
C/km lapse rates in the 2-6 km layer) are the primary threats if
any storms can mature.

Again, quite a bit of uncertainty, and the convection allowing
models support just that. These can and are really struggling in
a high CAPE/high PWAT atmosphere, showing some wildly dispersive
solutions of evolution. We'll continue to monitor closely, but do
think scattered storms are still a good bet between 9 PM - 1 AM.

MTF

&&

.SHORT TERM...
330 PM CDT

Through Thursday night...

Primary concern is the intensity, timing and coverage of the line
of severe storms this evening. While there was some reduction in
the insolation today due to lingering cloud cover, we are still
seeing some recovery late this afternoon. KILX 19z sounding
indicated MUCAPEs had increased to 1300 J/kg and will continue
climbing as afternoon heating continues. We also are seeing a bit
of a cap around 850 mb, but additional heating should work to
overcome any warm layer aloft. So assuming sufficient instability
will be present, low level shear profiles are becoming more
favorable for rotating updrafts. SFC-3km SRH is increasing as
well, already around 250 m2/s2. SPC mesoanalysis page is
projecting that to climb over 300 by the time the line of storms
arrives this evening. Timing looks to be slightly delayed from
the timing we had in the morning forecast, with arrival in our NW
counties now closer to 530-6pm. Severe threat will include
widespread damaging winds possibly up to 70 mph, with a few
tornadoes possible. Hail threat will be present, but no
significant hail sizes are anticipated.

Looking ahead, the next main concern will be the severe potential
late Thursday and Thursday evening. Yet another wave of strong to
severe storms is projected to develop across northern Illinois
late in the afternoon ahead of an advancing cold front. Dynamics
and kinematics point toward damaging winds as the primary hazard,
but a few tornadoes will also be possible. Hail threat will be
marginal with Thursday evenings storms.

Heat on Thursday looks to remain below heat advisory levels, and
even today had reduced heat levels from persistent cloud cover.
Will let the current heat advisory ride through expiration today.

Shimon

&&

.LONG TERM...
330 PM CDT

Friday through Wednesday...

The slowly departing cold front will keep chances of showers and
storms in our SE counties on Friday, but they should remain south
of the Chicago Metro area. The storms should remain below severe
levels on Friday, with those chances primarily in southern and
SE Illinois. Precip should depart to the SE by Friday evening,
setting the stage for a pleasant weekend with low heat and
humidity, by August standards.

A shift in the longwave pattern will allow Canadian high pressure
to slowly advance along the northern CONUS, providing northerly
breezes and lowering dewpoints. High temps through the weekend
into Monday look to remain in the upper 70s to lower 80s. A
warming trend will develop on Tuesday and Wednesday as southerly
winds develop on the west side of departing high pressure. A few
showers/storms could bubble up on Tuesday afternoon and again on
Wednesday, but coverage will be isolated for the most part.

Shimon

&&

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

628 PM...Primary forecast concern is thunderstorm chances tonight
and again Thursday afternoon/evening.

Scattered thunderstorms from northeast IA into southern WI will
continue moving east/southeast this evening. Additional
thunderstorms are possible ahead of the current activity, but
confidence is low. Opted to delay the tempo timing based on
current trends but changes will be possible as trends emerge this
evening. Its also possible that coverage may increase over the
terminals by mid/late evening. Ahead of these storms, southwest
winds will remain gusty into the mid/upper 20kt range, but will
slowly diminish this evening.

Southwest winds will become gusty again Thursday morning with
another chance for thunderstorms later Thursday afternoon into
Thursday evening. Opted to carry prob mention at ord/mdw but
confidence is fairly low for both location and coverage. cms

&&

.LOT WATCHES/WARNINGS/ADVISORIES...
IL...None.
IN...None.
LM...Small Craft Advisory...nearshore waters
     until 10 PM Wednesday.

&&

Visit us at weather.gov/chicago

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

Hazardous weather outlook, Aug 11, 2:41 PM CST, 5 hours 57 minutes before

Hazardous Weather Outlook
National Weather Service Chicago/Romeoville IL
Issued by National Weather Service Lincoln IL
341 PM CDT Wed Aug 11 2021

ILZ003>006-008-010>013-019>021-023-032-033-039-103>108-INZ001-002-
010-011-019-122045-
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-
341 PM CDT Wed Aug 11 2021 /441 PM EDT Wed Aug 11 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 quarter size.
     Elevated damaging wind risk...up to 70 mph.
  Limited Flooding Risk.

DISCUSSION...

Severe thunderstorms will again be possible into this evening, with
organized thunderstorms expect to move southeast from Wisconsin
into the region. The primary threat is expected to be damaging
winds, though isolated large hail and brief tornadoes are also
possible. Locally heavy rainfall will occur with some of these
storms.

Afternoon heat index values may temporarily reach values of 100
to 105 degrees depending on the amount of sunshine in any one area.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday.

Thursday...
  Limited Severe Thunderstorm Risk.
  Limited Flooding Risk.
  Elevated Excessive Heat Risk.
Friday...
  Limited Thunderstorm Risk.
Tuesday...
  Limited Thunderstorm Risk.

DISCUSSION:

Scattered thunderstorms are possible Thursday afternoon and
night. A few of these could be severe. Scattered storms will
also be possible south of I-80 on Friday.

.SPOTTER INFORMATION STATEMENT...

 Spotters may be needed this evening, especially north of I-80.

GENERAL STORM MOTION OF THE DAY:

  Moving toward the east southeast at 30 to 45 mph.

LMZ740>745-122045-
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-
341 PM CDT Wed Aug 11 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...

  Hazardous conditions for small craft.
  Elevated Thunderstorm Risk...with an associated:
     Limited Waterspout Risk.
     Limited Hail Risk...up to quarter size.
     Elevated thunderstorm wind gust risk...up to 50 knots.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday.

Thursday...
  Limited Severe Thunderstorm Risk.
Friday...
  Limited Thunderstorm Risk.

Shimon

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

In the hours before

Local storm report, Aug 11, 4:27 PM CST, 4 hours 11 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO IL
527 PM CDT WED AUG 11 2021

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

0955 AM     TSTM WND DMG     1 SSE LISLE             41.79N 88.07W
08/11/2021                   DUPAGE             IL   PUBLIC

            SEVERAL LARGE TREE BRANCHES DOWNED ALONG
            MAPLE AVENUE IN DOWNERS GROVE.

&&

RO

Local storm report, Aug 11, 4:59 PM CST, 3 hours 39 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO IL
559 PM CDT WED AUG 11 2021

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

0612 PM     TSTM WND DMG     PECATONICA              42.31N 89.36W
08/10/2021                   WINNEBAGO          IL   AMATEUR RADIO

            POWER LINES DOWNED IN THE VICINITY OF
            PECATONICA. TIME ESTIMATED BY RADAR.

0638 PM     TSTM WND DMG     2 NE LAKE IN THE HILLS  42.20N 88.30W
08/10/2021                   MCHENRY            IL   PUBLIC

            BILLBOARD DESTROYED ALONG VIRGINIA AVE IN
            CRYSTAL LAKE.

0648 PM     TSTM WND DMG     2 ESE TIMBERLANE        42.33N 88.83W
08/10/2021                   BOONE              IL   PUBLIC

            APPROXIMATELY 2 FOOT DIAMETER TREE SNAPPED
            AT BASE.

0717 PM     TSTM WND DMG     2 W SCHAUMBURG          42.02N 88.12W
08/10/2021                   COOK               IL   NWS EMPLOYEE

            APPROXIMATELY 5 INCH DIAMETER TREE LIMB
            DOWNED.

0736 PM     TSTM WND DMG     BUFFALO GROVE           42.17N 87.97W
08/10/2021                   LAKE               IL   PUBLIC

            SEVERAL TREES DOWNED AROUND BUFFALO GROVE.

0745 PM     TSTM WND DMG     SKOKIE                  42.03N 87.76W
08/10/2021                   COOK               IL   BROADCAST MEDIA

            LARGE TREE UPROOTED AND FELL ONTO CAR.

0747 PM     TSTM WND DMG     EVANSTON                42.06N 87.69W
08/10/2021                   COOK               IL   BROADCAST MEDIA

            SEVERAL LARGE TREES UPROOTED OR SNAPPED
            THROUGHOUT EVANSTON.

0753 PM     MARINE TSTM WIND 1 NE MONTROSE HARBOR    41.97N 87.63W
08/10/2021  M62 MPH          LMZ741             IL   MESONET

            MESONET STATION XMTB MONTROSE BEACH LIGHT.

&&

Local storm report, Aug 11, 5:03 PM CST, 3 hours 35 minutes before

PRELIMINARY LOCAL STORM REPORT...SUMMARY
NATIONAL WEATHER SERVICE CHICAGO IL
603 PM CDT WED AUG 11 2021

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

0546 PM     TSTM WND DMG     1 N ROCKFORD            42.29N 89.09W
08/10/2021                   WINNEBAGO          IL   BROADCAST MEDIA

            TREE DOWNED ON POWERLINES ALONG AUBURN
            STREET NEAR RIDGE AVENUE. TIME ESTIMATED BY
            RADAR.

0550 PM     TSTM WND DMG     2 E ROCKFORD            42.27N 89.05W
08/10/2021                   WINNEBAGO          IL   AMATEUR RADIO

            POWER LINES DOWNED ON STATE STREET NEAR PALM
            AVENUE. TIME ESTIMATED BY RADAR.

0555 PM     TSTM WND DMG     3 ESE LOVES PARK        42.30N 89.01W
08/10/2021                   WINNEBAGO          IL   AMATEUR RADIO

            8-IN DIAMETER TREE DOWN ALONG SPRING BROOK
            ROAD WEST OF MULFORD ROAD. TIME ESTIMATED BY
            RADAR.

0600 PM     TSTM WND DMG     ROSCOE                  42.41N 89.01W
08/10/2021                   WINNEBAGO          IL   BROADCAST MEDIA

            LARGE TREE UPROOTED IN ROSCOE AREA. TIME
            ESTIMATED BY RADAR.

0605 PM     TSTM WND DMG     LEAF RIVER              42.13N 89.40W
08/10/2021                   OGLE               IL   PUBLIC

            MULTIPLE TREES DOWNED IN LEAF RIVER,
            INCLUDING SOME LARGE BRANCHES. TIME
            ESTIMATED BY RADAR.

0612 PM     TSTM WND DMG     PECATONICA              42.31N 89.36W
08/10/2021                   WINNEBAGO          IL   AMATEUR RADIO

            POWER LINES DOWNED IN THE VICINITY OF
            PECATONICA. TIME ESTIMATED BY RADAR.

0615 PM     TSTM WND DMG     ROCKTON                 42.46N 89.07W
08/10/2021                   WINNEBAGO          IL   PUBLIC

            PHOTO SHARED VIA SOCIAL MEDIA SHOWS LARGE
            BRANCH DOWNED IN ROCKTON AREA.

0625 PM     TSTM WND GST     1 NNW ROCHELLE          41.94N 89.07W
08/10/2021  M58 MPH          OGLE               IL   PUBLIC

            PRIVATE WEATHER STATION REPORTED 58 MPH GUST
            IN NORTHWEST ROCHELLE.

0629 PM     TSTM WND DMG     1 N NEW MILFORD         42.19N 89.07W
08/10/2021                   WINNEBAGO          IL   BROADCAST MEDIA

            TREES DOWN IN CHEROKEE HILLS NEIGHBORHOOD OF
            NEW MILFORD. TIME ESTIMATED BY RADAR.

0633 PM     TSTM WND DMG     2 NE FAIRDALE           42.12N 88.90W
08/10/2021                   DE KALB            IL   BROADCAST MEDIA

            DAMAGE TO AGRICULTURE AND SOME TREES IN THE
            VICINITY OF KIRKLAND. GENERAL AREA WAS IN
            FAR NORTHWEST DEKALB COUNTY NORTH OF QUARRY
            ROAD AND SOUTHWEST OF CHERRY VALLEY ROAD.
            TIME ESTIMATED BY RADAR.

0634 PM     TSTM WND GST     ROCKFORD AIRPORT        42.20N 89.10W
08/10/2021  M55 MPH          WINNEBAGO          IL   OFFICIAL NWS OBS

            RECORDED AT THE ROCKFORD ASOS.

0635 PM     TSTM WND GST     2 SSW ROCHELLE          41.89N 89.08W
08/10/2021  E56 MPH          OGLE               IL   AWOS

            RECORDED AT THE ROCHELLE AWOS.

0638 PM     TSTM WND DMG     2 NE LAKE IN THE HILLS  42.20N 88.30W
08/10/2021                   MCHENRY            IL   PUBLIC

            BILLBOARD DESTROYED ALONG VIRGINIA AVE IN
            CRYSTAL LAKE.

0638 PM     TSTM WND DMG     2 NE LAKE IN THE HILLS  42.21N 88.30W
08/10/2021                   MCHENRY            IL   PUBLIC

            MULTIPLE TREES AND POWER LINES DOWNED IN THE
            CRYSTAL LAKE, ALGONQUIN, CARY, AND MCHENRY
            AREAS. TIME ESTIMATED BY RADAR.

0639 PM     TSTM WND DMG     1 E CRYSTAL LAKE        42.24N 88.30W
08/10/2021                   MCHENRY            IL   PUBLIC

            NUMEROUS TREES AND TREE LIMBS DOWNED NEAR
            PINGREE ROAD AND US31 IN CRYSTAL LAKE. TIME
            ESTIMATED BY RADAR.

0644 PM     TSTM WND DMG     SANDWICH                41.65N 88.62W
08/10/2021                   DE KALB            IL   EMERGENCY MNGR

            TREE DOWNED ON POWER LINES NEAR LISBON
            STREET AND GREEN STREET IN SANDWICH. TIME
            ESTIMATED BY RADAR.

0645 PM     TSTM WND GST     1 WSW OAKWOOD HILLS     42.24N 88.26W
08/10/2021  M45 MPH          MCHENRY            IL   PUBLIC

0648 PM     TSTM WND DMG     2 ESE TIMBERLANE        42.33N 88.83W
08/10/2021                   BOONE              IL   PUBLIC

            APPROXIMATELY 2 FOOT DIAMETER TREE SNAPPED
            AT BASE.

0648 PM     TSTM WND GST     ISLAND LAKE             42.27N 88.19W
08/10/2021  M60 MPH          LAKE               IL   TRAINED SPOTTER

0650 PM     HAIL             2 N BELVIDERE           42.29N 88.85W
08/10/2021  E0.88 INCH       BOONE              IL   PUBLIC

            RELAYED VIA WINNEBAGO EMA.

0650 PM     TSTM WND GST     5 ENE HERBERT           42.18N 88.70W
08/10/2021  M57 MPH          MCHENRY            IL   PUBLIC

            PRIVATE WEATHER STATION REPORTED 57 MPH WIND
            GUST SOUTHWEST OF MARENGO NEAR HARMONY ROAD
            AND GENOA ROAD.

0650 PM     TSTM WND GST     4 NW HARVARD            42.47N 88.66W
08/10/2021  M60 MPH          MCHENRY            IL   PUBLIC

            PRIVATE WEATHER STATION REPORTED 60 MPH GUST
            NORTHWEST OF HARVARD NEAR LAWRENCE ROAD AND
            MAXON ROAD.

0652 PM     TSTM WND DMG     MARENGO                 42.26N 88.60W
08/10/2021                   MCHENRY            IL   PUBLIC

            BRANCH DOWNED IN MARENGO AREA. REPORT
            RELAYED VIA MPING. TIME ESTIMATED BY RADAR.

0653 PM     TSTM WND GST     2 WNW SUGAR GROVE       41.77N 88.48W
08/10/2021  M58 MPH          KANE               IL   ASOS

            RECORDED AT THE AURORA-SUGAR GROVE ASOS.

0655 PM     TSTM WND GST     2 NE UNION              42.26N 88.51W
08/10/2021  M57 MPH          MCHENRY            IL   EMERGENCY MNGR

            GUST OF 57 MPH NEAR FRANKLINVILLE ROAD AND
            IL-176. TIME ESTIMATED BY RADAR.

0700 PM     TSTM WND GST     3 SSE HARVARD           42.39N 88.59W
08/10/2021  M67 MPH          MCHENRY            IL   LAW ENFORCEMENT

            MEASURED WITH ANEMOMETER. LARGE TREES
            UPROOTED.

0703 PM     TSTM WND DMG     2 N BULL VALLEY         42.33N 88.36W
08/10/2021                   MCHENRY            IL   PUBLIC

            PUBLIC REPORT OF TREE BRANCHES DOWNED NEAR
            BULL VALLEY. RELAYED VIA MPING. TIME
            ESTIMATED BY RADAR.

0705 PM     TSTM WND DMG     GREENWOOD               42.39N 88.38W
08/10/2021                   MCHENRY            IL   PUBLIC

            NUMEROUS TREES DOWNED NEAR WONDER LAKE. ONE
            TREE HAS MOST BRANCHED REMOVED. TIME
            ESTIMATED BY RADAR.

0705 PM     TSTM WND DMG     MCHENRY                 42.34N 88.27W
08/10/2021                   MCHENRY            IL   PUBLIC

            DELAYED REPORT RELAYED VIA SOCIAL MEDIA.
            LARGE TREE DOWN THROUGH ROOF, WITH LARGE
            TREE ALSO BLOWN DOWN IN NEIGHBORING YARD.
            TIME ESTIMATED VIA RADAR.

0711 PM     TSTM WND DMG     ELGIN                   42.04N 88.29W
08/10/2021                   KANE               IL   PUBLIC

            NUMEROUS REPORTS OF TREE BRANCHES DOWNED IN
            ELGIN AND VICINITY. RELAYED VIA MPING. TIME
            ESTIMATED BY RADAR.

0711 PM     TSTM WND DMG     SLEEPY HOLLOW           42.09N 88.32W
08/10/2021                   KANE               IL   PUBLIC

            DELAYED REPORT. RELAYED VIA SOCIAL MEDIA.
            LARGE TREE LIMBS BLOWN DOWN AND LARGE TREE
            BLOWN DOWN OR UPROOTED NEAR BEAU BRUMMEL DR
            AND SLEEPY HOLLOW RD.

0712 PM     TSTM WND DMG     WEST DUNDEE             42.10N 88.28W
08/10/2021                   KANE               IL   PUBLIC

            DELAYED REPORT RELAYED VIA SOCIAL MEDIA.
            MULTIPLE LARGE TREES AND TREE LIMBS BLOWN
            DOWN THROUGHOUT TOWN. TIME ESTIMATED BY
            RADAR.

0715 PM     TSTM WND DMG     ALGONQUIN               42.17N 88.30W
08/10/2021                   MCHENRY            IL   PUBLIC

            PUBLIC REPORT OF AN UPROOTED AND ANOTHER
            SNAPPED TREE IN ALGONQUIN. TIME ESTIMATED BY
            RADAR.

0717 PM     TSTM WND DMG     2 W SCHAUMBURG          42.02N 88.12W
08/10/2021                   COOK               IL   NWS EMPLOYEE

            APPROXIMATELY 5 INCH DIAMETER TREE LIMB
            DOWNED.

0718 PM     TSTM WND DMG     2 ENE SOUTH BARRINGTON  42.10N 88.12W
08/10/2021                   COOK               IL   PUBLIC

            LARGE TREES DOWN.

0729 PM     TSTM WND GST     MOUNT PROSPECT          42.07N 87.94W
08/10/2021  M51 MPH          COOK               IL   PUBLIC

            PRIVATE WEATHER STATION REPORTS 51 MPH GUST
            IN MT PROSPECT.

0730 PM     TSTM WND GST     1 NNW ROSELLE           41.99N 88.08W
08/10/2021  M60 MPH          COOK               IL   PUBLIC

            PRIVATE WEATHER STATION REPORTED 60 MPH GUST
            NEAR ROSELLE.

0730 PM     TSTM WND DMG     GRAYSLAKE               42.34N 88.04W
08/10/2021                   LAKE               IL   PUBLIC

            TRAINED SPOTTER REPORTS SHINGLES BLOWN OFF
            ROOF IN GRAYSLAKE AREA. TIME ESTIMATED BY
            RADAR.

0730 PM     TSTM WND GST     3 WSW MONTGOMERY        41.71N 88.40W
08/10/2021  M55 MPH          KENDALL            IL   PUBLIC

            PRIVATE WEATHER STATION REPORTED 55 MPH WIND
            GUST NEAR MONTGOMERY. TIME ESTIMATED BY
            RADAR.

0733 PM     TSTM WND DMG     ELMHURST                41.90N 87.94W
08/10/2021                   DUPAGE             IL   PUBLIC

            PUBLIC REPORT OF LARGE BRANCHES DOWNED IN
            ELMHURST AREA. TIME ESTIMATED BY RADAR.

0735 PM     TSTM WND GST     1 W ELMHURST            41.90N 87.95W
08/10/2021  M57 MPH          DUPAGE             IL   PUBLIC

            PRIVATE WEATHER STATION REPORTS 57 MPH WIND
            GUST IN ELMHURST.

0735 PM     TSTM WND DMG     DES PLAINES             42.05N 87.88W
08/10/2021                   COOK               IL   TRAINED SPOTTER

            TRAINED SPOTTER REPORTS LARGE TREE SNAPPED
            IN DES PLAINES. OTHER REPORTS OF TREE
            DAMAGED ALSO RECEIVED IN VICINITY. TIME
            ESTIMATED BY RADAR.

0735 PM     TSTM WND DMG     OAKBROOK TERRACE        41.85N 87.97W
08/10/2021                   DUPAGE             IL   BROADCAST MEDIA

            POWER LINE DOWNED NEAR MIDWEST ROAD AND
            BUTTERFIELD ROAD IN OAK BROOK. TIME
            ESTIMATED BY RADAR.

0736 PM     TSTM WND DMG     BUFFALO GROVE           42.17N 87.97W
08/10/2021                   LAKE               IL   PUBLIC

            SEVERAL TREES DOWNED AROUND BUFFALO GROVE.

0738 PM     TSTM WND DMG     1 ENE WADSWORTH         42.43N 87.91W
08/10/2021                   LAKE               IL   TRAINED SPOTTER

            TRAINED SPOTTER RELAYED 5 INCH TO 2 FOOT
            DIAMETER BRANCHES DOWN IN AN AROUND
            WADSWORTH.

0745 PM     TSTM WND DMG     SKOKIE                  42.03N 87.76W
08/10/2021                   COOK               IL   BROADCAST MEDIA

            LARGE TREE UPROOTED AND FELL ONTO CAR.

0745 PM     TSTM WND GST     EVANSTON                42.05N 87.69W
08/10/2021  M65 MPH          COOK               IL   PUBLIC

            DELAYED REPORT. RELAYED VIA SOCIAL MEDIA.

0747 PM     TSTM WND DMG     EVANSTON                42.06N 87.69W
08/10/2021                   COOK               IL   BROADCAST MEDIA

            SEVERAL LARGE TREES UPROOTED OR SNAPPED
            THROUGHOUT EVANSTON.

0747 PM     TSTM WND DMG     FRANKLIN PARK           41.93N 87.89W
08/10/2021                   COOK               IL   TRAINED SPOTTER

            SPOTTER REPORTS 60 MPH GUST NEAR GRAND
            AVENUE AND MANHEIM ROAD NEAR FRANKLIN PARK.

0748 PM     TSTM WND DMG     1 NNW HOMETOWN          41.74N 87.74W
08/10/2021                   COOK               IL   PUBLIC

            PUBLIC REPORT OF A 6 INCH DIAMETER LIMB DOWN
            BLOCKING 83RD AND CICERO IN OAK LAWN.

0749 PM     TSTM WND GST     3 SW MIDWAY AIRPORT     41.74N 87.78W
08/10/2021  M60 MPH          COOK               IL   CO-OP OBSERVER

            COOPERATIVE OBSERVER REPORTS 60 MPH GUST
            NEAR CHICAGO MIDWAY AIRPORT.

0750 PM     TSTM WND DMG     1 NW WEST RIDGE - CHICA 42.01N 87.71W
08/10/2021                   COOK               IL   NWS EMPLOYEE

            TREE DOWNED NEAR KEDZIE AVENUE AND TOUHY
            AVENUE IN CHICAGO. TIME ESTIMATED BY RADAR.

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.

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.

0753 PM     MARINE TSTM WIND 1 NE MONTROSE HARBOR    41.97N 87.63W
08/10/2021  M62 MPH          LMZ741             IL   MESONET

            MESONET STATION XMTB MONTROSE BEACH LIGHT.

0755 PM     TSTM WND GST     HIGHWOOD                42.20N 87.81W
08/10/2021  M54 MPH          LAKE               IL   TRAINED SPOTTER

            TRAINED SPOTTER REPORTS 54 MPH WIND GUST IN
            HIGHWOOD. TIME ESTIMATED BY RADAR.

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.

0800 PM     MARINE TSTM WIND HARRISON-DEVER CRIB     41.92N 87.57W
08/10/2021  M54 MPH          LMZ741             IL   C-MAN STATION

            RECORDED AT THE HARRISON-DEVER CRIB.
            ANEMOMETER IS AT 26 M ABOVE SITE ELEVATION.

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.

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

            TIME ESTIMATED BY RADAR.

0846 PM     TSTM WND DMG     BEVERLY SHORES          41.69N 86.98W
08/10/2021                   PORTER             IN   LAW ENFORCEMENT

            MULTIPLE TREES DOWNED. TIME ESTIMATED BY
            RADAR.

0945 PM     TSTM WND DMG     2 ENE ROSELAWN          41.16N 87.28W
08/10/2021                   JASPER             IN   LAW ENFORCEMENT

            LARGE TREE DOWN AT PAUL REVERE RD AND N
            COUNTY ROAD 1200 W. TIME ESTIMATED BY RADAR.

1004 PM     TSTM WND DMG     1 NNE WHEATFIELD        41.20N 87.05W
08/10/2021                   JASPER             IN   TRAINED SPOTTER

            LARGE TREE DOWNED. MEASURED 57 MPH WIND GUST
            NEAR THE LOCATION OF THE DOWNED TREE.

0431 AM     TSTM WND GST     4 ESE VALPARAISO        41.45N 87.00W
08/11/2021  M52 MPH          PORTER             IN   ASOS

            ASOS STATION KVPZ VALPARAISO AIRPORT.

&&

Local storm report, Aug 11, 5:06 PM CST, 3 hours 32 minutes before

PRELIMINARY LOCAL STORM REPORT...SUMMARY
NATIONAL WEATHER SERVICE CHICAGO IL
606 PM CDT WED AUG 11 2021

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

0850 AM     TSTM WND DMG     SUBLETTE                41.64N 89.23W
08/11/2021                   LEE                IL   BROADCAST MEDIA

            LARGE LIMBS DOWNED.

0854 AM     TSTM WND DMG     MENDOTA                 41.55N 89.12W
08/11/2021                   LA SALLE           IL   BROADCAST MEDIA

            NUMEROUS TREES DOWNED IN MENDOTA. A COUPLE
            OF TREES SNAPPED AT THE BASE.

0856 AM     TSTM WND DMG     5 SSW COMPTON           41.63N 89.11W
08/11/2021                   LEE                IL   TRAINED SPOTTER

            WIND TURBINE BLADE BLOWN OFF.

0910 AM     TSTM WND DMG     SOMONAUK                41.63N 88.68W
08/11/2021                   DE KALB            IL   PUBLIC

            PART OF LARGE TREE SNAPPED OFF.

0915 AM     TSTM WND GST     2 SSW ROCHELLE          41.89N 89.08W
08/11/2021  M52 MPH          OGLE               IL   AWOS

            AWOS STATION KRPJ ROCHELLE AIRPORT.

0915 AM     TSTM WND DMG     WATERMAN                41.77N 88.77W
08/11/2021                   DE KALB            IL   TRAINED SPOTTER

            SIDING RIPPED OFF THE SIDE OF A BUILDING IN
            WATERMAN.

0918 AM     TSTM WND DMG     2 SW PLANO              41.64N 88.57W
08/11/2021                   KENDALL            IL   PUBLIC

            SEVERAL TREES SNAPPED OR DOWNED BETWEEN
            SANDWICH AND PLANO.

0918 AM     TSTM WND DMG     1 W PLANO               41.66N 88.56W
08/11/2021                   KENDALL            IL   TRAINED SPOTTER

            TREE DOWNED ON LITTLE ROCK RD WEST OF PLANO.

0919 AM     TSTM WND GST     3 NNW SHERIDAN          41.57N 88.71W
08/11/2021  M54 MPH          LA SALLE           IL   MESONET

            PRIVATE WEATHER STATION REPORTED PEAK WIND
            GUST OF 54 MPH BETWEEN SOMONAUK AND
            SHERIDAN.

0920 AM     TSTM WND DMG     SANDWICH                41.65N 88.62W
08/11/2021                   DE KALB            IL   EMERGENCY MNGR

            NUMEROUS TREES AND WIRES DOWNED THROUGHOUT
            SANDWICH.

0922 AM     TSTM WND DMG     3 SSW BIG ROCK          41.72N 88.57W
08/11/2021                   KENDALL            IL   PUBLIC

            LARGE OAK TREE SNAPPED AT BASE.

0924 AM     TSTM WND GST     PLANO                   41.66N 88.53W
08/11/2021  M68 MPH          KENDALL            IL   MESONET

            PRIVATE WEATHER STATION REPORTED PEAK WIND
            GUST OF 68 MPH. WINDS GUSTED ABOVE 60 MPH
            FOR 15 MINUTES.

0928 AM     TSTM WND DMG     OSWEGO                  41.68N 88.35W
08/11/2021                   KENDALL            IL   PUBLIC

            LARGE TREE LIMB DOWNED AND FENCE BLOWN OVER.

0928 AM     TSTM WND GST     2 WNW SUGAR GROVE       41.77N 88.47W
08/11/2021  M64 MPH          KANE               IL   ASOS

            KARR ASOS PEAK GUST.

0929 AM     TSTM WND DMG     OSWEGO                  41.68N 88.35W
08/11/2021                   KENDALL            IL   PUBLIC

            HALF OF TREE SNAPPED AT ITS FORK.

0930 AM     TSTM WND DMG     BOULDER HILL            41.71N 88.34W
08/11/2021                   KENDALL            IL   TRAINED SPOTTER

            MULTIPLE LARGE TREE LIMBS DOWNED IN BOULDER
            HILL.

0931 AM     TSTM WND GST     ROCKFORD AIRPORT        42.20N 89.10W
08/11/2021  M60 MPH          WINNEBAGO          IL   ASOS

            KRFD ASOS PEAK GUST.

0933 AM     TSTM WND DMG     AURORA                  41.76N 88.31W
08/11/2021                   KANE               IL   PUBLIC

            LARGE TREE LIMB DOWNED IN WILDER PARK IN
            AURORA AND NEARBY POWER POLE TILTED.

0935 AM     TSTM WND GST     3 WSW MONTGOMERY        41.71N 88.40W
08/11/2021  M68 MPH          KENDALL            IL   MESONET

            PEAK GUST ON PERSONAL WEATHER STATION.

0935 AM     TSTM WND GST     5 SE LISBON             41.43N 88.42W
08/11/2021  M55 MPH          GRUNDY             IL   AWOS

            AWOS STATION KC09 MORRIS AIRPORT.

0935 AM     TSTM WND DMG     2 W AURORA              41.76N 88.34W
08/11/2021                   KANE               IL   AMATEUR RADIO

            12 INCH DIAMETER LIMB DOWNED.

0936 AM     TSTM WND GST     2 NW PLAINFIELD         41.63N 88.23W
08/11/2021  E65 MPH          WILL               IL   NWS EMPLOYEE

            FENCE PANEL BLOWN OVER.

0937 AM     TSTM WND DMG     MINOOKA                 41.46N 88.26W
08/11/2021                   GRUNDY             IL   PUBLIC

            LARGE TREE DOWNED.

0938 AM     TSTM WND DMG     BATAVIA                 41.85N 88.31W
08/11/2021                   KANE               IL   PUBLIC

            LARGE TREE LIMB DOWNED.

0940 AM     TSTM WND DMG     ROCKFORD                42.27N 89.09W
08/11/2021                   WINNEBAGO          IL   PUBLIC

            MULTIPLE REPORTS OF TREE DAMAGE IN ROCKFORD.

0943 AM     TSTM WND DMG     GENEVA                  41.89N 88.31W
08/11/2021                   KANE               IL   PUBLIC

            FENCE BLOWN DOWN.

0946 AM     TSTM WND DMG     1 SSE NAPERVILLE        41.76N 88.14W
08/11/2021                   DUPAGE             IL   NWS EMPLOYEE

            TREE DEBRIS ON ROAD CAUSED ROAD CLOSURE.

0947 AM     TSTM WND DMG     WINFIELD                41.87N 88.16W
08/11/2021                   DUPAGE             IL   PUBLIC

            PART OF LARGE TREE SNAPPED AT BASE.

0951 AM     TSTM WND DMG     BELVIDERE               42.26N 88.84W
08/11/2021                   BOONE              IL   LAW ENFORCEMENT

            TREES AND WIRES DOWNED IN VARIOUS LOCATIONS
            IN AND AROUND BELVIDERE.

0954 AM     TSTM WND DMG     NEW LENOX               41.51N 87.97W
08/11/2021                   WILL               IL   PUBLIC

            MULTIPLE TREES DOWNED IN NEW LENOX.

0954 AM     TSTM WND DMG     SOUTH ELGIN             41.99N 88.30W
08/11/2021                   KANE               IL   PUBLIC

            LARGE TREE BRANCH DOWNED.

0955 AM     TSTM WND DMG     1 SSE LISLE             41.79N 88.07W
08/11/2021                   DUPAGE             IL   PUBLIC

            SEVERAL LARGE TREE BRANCHES DOWNED ALONG
            MAPLE AVENUE IN DOWNERS GROVE.

0955 AM     TSTM WND DMG     1 SW DOWNERS GROVE      41.78N 88.02W
08/11/2021                   DUPAGE             IL   PUBLIC

            PART OF TREE SNAPPED OFF.

0955 AM     TSTM WND DMG     1 N TIMBERLANE          42.34N 88.86W
08/11/2021                   BOONE              IL   LAW ENFORCEMENT

            TREE DOWNED ONTO WIRES.

0959 AM     TSTM WND DMG     ELGIN                   42.04N 88.28W
08/11/2021                   KANE               IL   PUBLIC

            LARGE TREE BRANCH DOWNED.

1000 AM     TSTM WND DMG     SLEEPY HOLLOW           42.09N 88.31W
08/11/2021                   KANE               IL   PUBLIC

            LARGE TREE UPROOTED.

1001 AM     TSTM WND DMG     WOODSTOCK               42.31N 88.45W
08/11/2021                   MCHENRY            IL   PUBLIC

            LARGE TREE SNAPPED HALFWAY UP.

1003 AM     TSTM WND DMG     2 E SCHAUMBURG          42.03N 88.04W
08/11/2021                   COOK               IL   COCORAHS

            9 INCH DIAMETER BRANCH DOWNED.

1004 AM     TSTM WND DMG     2 E LAKEWOOD            42.22N 88.34W
08/11/2021                   MCHENRY            IL   PUBLIC

            LARGE TREE SNAPPED.

1005 AM     TSTM WND DMG     PRAIRIE GROVE           42.28N 88.26W
08/11/2021                   MCHENRY            IL   PUBLIC

            PARTS OF LARGE TREES SNAPPED OFF.

1009 AM     TSTM WND DMG     WONDER LAKE             42.39N 88.35W
08/11/2021                   MCHENRY            IL   PUBLIC

            SEVERAL TREES DOWNED IN WONDER LAKE.

1009 AM     TSTM WND DMG     OAK PARK                41.89N 87.79W
08/11/2021                   COOK               IL   PUBLIC

            HALF OF TREE SNAPPED AT ITS FORK.

1013 AM     TSTM WND DMG     WAUCONDA                42.26N 88.15W
08/11/2021                   LAKE               IL   EMERGENCY MNGR

            POWER LINES DOWNED ONTO ROADS.

1016 AM     TSTM WND DMG     1 NW LONG LAKE          42.38N 88.14W
08/11/2021                   LAKE               IL   PUBLIC

            LARGE TREE DOWNED ONTO FENCE.

1017 AM     TSTM WND DMG     GRAYSLAKE               42.34N 88.04W
08/11/2021                   LAKE               IL   PUBLIC

            LARGE TREE UPROOTED.

1018 AM     TSTM WND DMG     FOX LAKE                42.40N 88.18W
08/11/2021                   LAKE               IL   PUBLIC

            SEVERAL TREES SNAPPED OR DOWNED IN FOX LAKE.

1026 AM     TSTM WND DMG     1 SW ANTIOCH            42.47N 88.11W
08/11/2021                   LAKE               IL   FIRE DEPT/RESCUE

            SIDING RIPPED OFF OF HOUSE AND FENCE KNOCKED
            DOWN.

1030 AM     TSTM WND DMG     BEACH PARK              42.43N 87.85W
08/11/2021                   LAKE               IL   PUBLIC

            SEVERAL LARGE TREES DOWNED IN BEACH PARK.

1034 AM     TSTM WND DMG     PLAINFIELD              41.61N 88.21W
08/11/2021                   WILL               IL   PUBLIC

            TREE DOWNED ONTO FENCE.

1053 AM     TSTM WND GST     MIDWAY AIRPORT          41.78N 87.76W
08/11/2021  M58 MPH          COOK               IL   ASOS

            ASOS STATION KMDW CHICAGO MIDWAY.

1055 AM     TSTM WND DMG     PORTAGE                 41.58N 87.18W
08/11/2021                   PORTER             IN   PUBLIC

            LARGE TREE LIMB DOWNED ONTO A SHED. TIME
            ESTIMATED.

1116 AM     TSTM WND DMG     4 S WHEATFIELD          41.13N 87.05W
08/11/2021                   JASPER             IN   AMATEUR RADIO

            4 INCH DIAMETER TREE BRANCHES DOWNED.

1156 AM     TSTM WND GST     4 ESE VALPARAISO        41.45N 87.00W
08/11/2021  M55 MPH          PORTER             IN   ASOS

            ASOS STATION KVPZ VALPARAISO AIRPORT.

&&

Local storm report, Aug 11, 6:39 PM CST, 1 hour 59 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO IL
739 PM CDT WED AUG 11 2021

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

1008 AM     TSTM WND DMG     2 SSW ROCKFORD          42.25N 89.11W
08/11/2021                   WINNEBAGO          IL   BROADCAST MEDIA

            *** 1 FATAL ***
            THREE PEOPLE WERE RESCUED FROM A MOBILE HOME
            THAT WAS CRUSHED BY A FALLEN TREE. ONE
            FATALITY WAS REPORTED. TIME CONFIRMED BY 911
            CALL CENTER.

&&

BB

Local storm report, Aug 11, 8:33 PM CST, 5 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO IL
933 PM CDT WED AUG 11 2021

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

0932 PM     TSTM WND GST     DUPAGE AIRPORT          41.92N 88.25W
08/11/2021  M56 MPH          DUPAGE             IL   ASOS

            ASOS STATION KDPA DUPAGE AIRPORT REPORTS 56
            MPH GUST.

&&

WSL

The radar

The Chicago radar (KLOT), 32 km away, was scanning. The volume nearest the first event began at 02:36 UTC.

Open the radar archive at this moment

Event by event

5 thunderstorm wind. Local standard time, as filed.

Thunderstorm Wind, Du Page

When: August 11, 8:38 PM CST
Where: Du Page County, 0.51 mi W of West Chicago
Measured: 55 kt (63 mph) estimated gust
Reported by: Law Enforcement
Coordinates: 41.880, -88.210

A large tree was blown down.

Thunderstorm Wind, Will

When: August 12, 1:15 AM CST
Where: Will County, 1.37 mi W of Braidwood
Measured: 60 kt (69 mph) estimated gust
Reported by: Emergency Manager
Coordinates: 41.270, -88.246

A tree was blown down onto power lines along County Line Road.

Thunderstorm Wind, Kankakee

When: August 12, 1:29 AM CST to 1:30 AM CST
Where: Kankakee County, 2.04 mi ENE of Aroma Park to 2.53 mi ENE of Aroma Park
Measured: 65 kt (75 mph) estimated gust
Reported by: Emergency Manager
Coordinates: 41.095, -87.776

Widespread tree damage occurred northeast of Aroma Park between Bittersweet Drive and Heiland Road. Numerous large tree limbs were blown down. Two houses suffered minor roof damage from the falling tree limbs. Some roads were blocked by the fallen trees. Power lines were also blown down.

Thunderstorm Wind, Kankakee

When: August 12, 1:29 AM CST to 1:30 AM CST
Where: Kankakee County, 1.39 mi ENE of Aroma Park to 1.78 mi ENE of Aroma Park
Measured: 65 kt (75 mph) estimated gust
Reported by: Emergency Manager
Coordinates: 41.089, -87.786

Widespread tree damage occurred near the Elks Country Club with numerous trees snapped or blown down along with large tree limbs and power lines also blown down.

Thunderstorm Wind, Kankakee

When: August 12, 1:30 AM CST to 1:31 AM CST
Where: Kankakee County, 2.61 mi NE of Aroma Park to 2.3 mi SW of Sun River Terrace
Measured: 65 kt (75 mph) estimated gust
Reported by: Emergency Manager
Coordinates: 41.105, -87.772

Significant tree damage occurred along Sandbar Road. Several trees were uprooted. Several large tree limbs were blown down and one fell onto a parked pickup truck. Power lines were also blown down.

What these are

Thunderstorm Wind: Winds from a thunderstorm of 50 knots (58 mph) or more, or lower winds that caused damage or casualties. Measured gusts are marked MG, estimated EG.

After NWS Directive 10-1605, the rules offices file Storm Data by.

The same day elsewhere

Every storm in Illinois in 2021 Every state in 2021 This day in weather history Warnings in Illinois, August 2021

Sources

NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 978383, 978386, 978676, 978678, 978674.