Alert archive / Illinois / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 92, NWS Quad Cities, IA
NWS Quad Cities, IA issued this severe thunderstorm warning at Aug 24, 2021, 5:01 PM CDT for Carroll County, Jo Daviess County, Stephenson County, Illinois; Jackson County, Iowa. It was in force for 59 min. 3 reports came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- Aug 24, 2021, 5:01 PM CDT (22:01 UTC)
- Expired
- Aug 24, 2021, 6:00 PM CDT
- In force
- 59 min
- Issued by
- NWS Quad Cities, IA
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
Counties Jackson County, IA, Carroll County, IL, Jo Daviess County, IL, Stephenson County, IL
The radar
The Quad Cities radar (KDVN), 98 km from the middle of the area, began a volume at 22:01 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Aug 24, 5:15 PM CDT | TSTM WND GST 65 | Savanna Airport, IL | |
| Aug 24, 5:23 PM CDT | TSTM WND GST 60 | Lanark, IL | SMALL TREE LIMBS COMING DOWN. |
| Aug 24, 5:32 PM CDT | TSTM WND DMG | Lanark, IL | 4 INCH DIAMETER TREE BRANCH DOWN IN TOWN, ANOTHER TREE APPROX 1 FOOT IN DIAMETER SNAPPED NEAR BASE ON E FRANKLIN ST. TIME ESTIMATED FROM RADAR. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Aug 24, 1:52 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
The nearest sounding before it
Davenport, (KDVN), launched 12:00Z, 10.0 hours before the alert went out and 93 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 1809 J/kg
- Mixed-layer CIN
- -127 J/kg
- Mixed-layer LCL
- 1284 m above ground
- 0-6 km bulk shear
- 15 kt
- 0-1 km storm-relative helicity
- 35 m²/s²
- 0-3 km storm-relative helicity
- 9 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
668
WUUS53 KDVN 242201
SVRDVN
ILC015-085-177-IAC097-242300-
/O.NEW.KDVN.SV.W.0092.210824T2201Z-210824T2300Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Quad Cities IA/IL
501 PM CDT Tue Aug 24 2021
The National Weather Service in the Quad Cities has issued a
* Severe Thunderstorm Warning for...
Jo Daviess County in northwestern Illinois...
Carroll County in northwestern Illinois...
Stephenson County in northwestern Illinois...
Southeastern Jackson County in east central Iowa...
* Until 600 PM CDT.
* At 501 PM CDT, severe thunderstorms were located along a line
extending from near Scales Mound to Miles, moving east at 50 mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Trained weather spotters.
IMPACT...Hail damage to vehicles is expected. Expect wind damage
to roofs, siding, and trees.
* Severe thunderstorms will be near...
Apple River around 505 PM CDT.
Savanna and Sabula around 510 PM CDT.
Stockton and Warren around 515 PM CDT.
Mount Carroll and Nora around 520 PM CDT.
Other locations in the path of these severe thunderstorms include
Lena, Winslow, Chadwick, Freeport, Cedarville, Dakota and Rock City.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
sturdy building.
Torrential rainfall is occurring with these storms, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 4220 8940 4220 8969 4201 8969 4204 9043
4251 9024 4250 8940
TIME...MOT...LOC 2201Z 282DEG 42KT 4250 9019 4206 9033
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
Ervin5 follow-up statements
053
WWUS53 KDVN 242215 RRA
SVSDVN
Severe Weather Statement
National Weather Service Quad Cities IA/IL
515 PM CDT Tue Aug 24 2021
ILC015-085-177-IAC097-242300-
/O.CON.KDVN.SV.W.0092.000000T0000Z-210824T2300Z/
Jo Daviess IL-Carroll IL-Stephenson IL-Jackson IA-
515 PM CDT Tue Aug 24 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 600 PM CDT
FOR JO DAVIESS...CARROLL...STEPHENSON AND SOUTHEASTERN JACKSON
COUNTIES...
At 515 PM CDT, severe thunderstorms were located along a line
extending from near Nora to near Savanna, moving east at 55 mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Radar indicated.
IMPACT...Hail damage to vehicles is expected. Expect wind damage to
roofs, siding, and trees.
These severe storms will be near...
Lena and Winslow around 520 PM CDT.
Other locations in the path of these severe thunderstorms include
Chadwick, Lanark, Cedarville, Dakota, Davis and Rock City.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Torrential rainfall is occurring with these storms, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 4220 8940 4220 8969 4201 8969 4204 9043
4251 9024 4250 8940
TIME...MOT...LOC 2215Z 278DEG 49KT 4247 8990 4204 9009
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
Ervin870
WWUS53 KDVN 242230
SVSDVN
Severe Weather Statement
National Weather Service Quad Cities IA/IL
530 PM CDT Tue Aug 24 2021
ILC015-085-177-IAC097-242300-
/O.CON.KDVN.SV.W.0092.000000T0000Z-210824T2300Z/
Jo Daviess IL-Carroll IL-Stephenson IL-Jackson IA-
530 PM CDT Tue Aug 24 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 600 PM CDT
FOR EASTERN JO DAVIESS...CARROLL...STEPHENSON AND SOUTHEASTERN
JACKSON COUNTIES...
At 529 PM CDT, severe thunderstorms were located along a line
extending from Rock City to near Chadwick, moving east at 55 mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Trained weather spotters.
IMPACT...Hail damage to vehicles is expected. Expect wind damage to
roofs, siding, and trees.
These severe storms will be near...
Davis, Dakota and Rock City around 535 PM CDT.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Wind damage with these storms will occur before any rain or
lightning. Do not wait for the sound of thunder before taking cover.
SEEK SHELTER IMMEDIATELY inside a sturdy structure and stay away from
windows.
Torrential rainfall is occurring with these storms, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 4220 8940 4220 8969 4201 8969 4204 9043
4251 8996 4250 8940
TIME...MOT...LOC 2229Z 277DEG 49KT 4243 8948 4204 8994
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
Ervin232
WWUS53 KDVN 242238
SVSDVN
Severe Weather Statement
National Weather Service Quad Cities IA/IL
538 PM CDT Tue Aug 24 2021
ILC085-IAC097-242248-
/O.CAN.KDVN.SV.W.0092.000000T0000Z-210824T2300Z/
Jo Daviess IL-Jackson IA-
538 PM CDT Tue Aug 24 2021
...THE SEVERE THUNDERSTORM WARNING FOR EASTERN JO DAVIESS AND
SOUTHEASTERN JACKSON COUNTIES IS CANCELLED...
The storms which prompted the warning have moved out of the warned
area. Therefore, the warning has been cancelled.
A Severe Thunderstorm Watch remains in effect until 700 PM CDT for
northwestern Illinois.
LAT...LON 4250 8940 4220 8940 4220 8969 4201 8969
4203 9007 4220 8996 4220 8992 4225 8992
4250 8975
TIME...MOT...LOC 2238Z 278DEG 40KT 4245 8940 4202 8983
$$
ILC015-177-242300-
/O.CON.KDVN.SV.W.0092.000000T0000Z-210824T2300Z/
Carroll IL-Stephenson IL-
538 PM CDT Tue Aug 24 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 600 PM CDT
FOR NORTHEASTERN CARROLL AND STEPHENSON COUNTIES...
At 538 PM CDT, severe thunderstorms were located along a line
extending from Lake Summerset to near Chadwick, moving east at 45
mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Trained weather spotters.
IMPACT...Hail damage to vehicles is expected. Expect wind damage to
roofs, siding, and trees.
These severe storms will be near...
Davis around 545 PM CDT.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Wind damage with these storms will occur before any rain or
lightning. Do not wait for the sound of thunder before taking cover.
SEEK SHELTER IMMEDIATELY inside a sturdy structure and stay away from
windows.
Torrential rainfall is occurring with these storms, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 4250 8940 4220 8940 4220 8969 4201 8969
4203 9007 4220 8996 4220 8992 4225 8992
4250 8975
TIME...MOT...LOC 2238Z 278DEG 40KT 4245 8940 4202 8983
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
Ervin110
WWUS53 KDVN 242249
SVSDVN
Severe Weather Statement
National Weather Service Quad Cities IA/IL
549 PM CDT Tue Aug 24 2021
ILC015-177-242300-
/O.CON.KDVN.SV.W.0092.000000T0000Z-210824T2300Z/
Carroll IL-Stephenson IL-
549 PM CDT Tue Aug 24 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 600 PM CDT
FOR NORTHEASTERN CARROLL AND EASTERN STEPHENSON COUNTIES...
At 549 PM CDT, severe thunderstorms were located along a line
extending from near Durand to near Polo, moving east at 50 mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Radar indicated.
IMPACT...Hail damage to vehicles is expected. Expect wind damage to
roofs, siding, and trees.
These severe thunderstorms will remain over mainly rural areas of
northeastern Carroll and eastern Stephenson Counties, including the
following locations... Albertus Airport, Rock Grove, Winneshiek,
Dakota Dornink Airport, Stephenson County Fairgrounds and Lake
Summerset.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Wind damage with these storms will occur before any rain or
lightning. Do not wait for the sound of thunder before taking cover.
SEEK SHELTER IMMEDIATELY inside a sturdy structure and stay away from
windows.
Torrential rainfall is occurring with these storms, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 4250 8940 4220 8940 4220 8969 4201 8969
4202 8991 4207 8982 4220 8976 4228 8969
4249 8951
TIME...MOT...LOC 2249Z 282DEG 42KT 4242 8924 4200 8967
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
Ervin890
WWUS53 KDVN 242254
SVSDVN
Severe Weather Statement
National Weather Service Quad Cities IA/IL
554 PM CDT Tue Aug 24 2021
ILC015-177-242304-
/O.EXP.KDVN.SV.W.0092.000000T0000Z-210824T2300Z/
Carroll IL-Stephenson IL-
554 PM CDT Tue Aug 24 2021
...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN CARROLL AND
EASTERN STEPHENSON COUNTIES WILL EXPIRE AT 600 PM CDT...
The storms which prompted the warning have moved out of the area.
Therefore, the warning will be allowed to expire. However heavy rain
is still possible with these thunderstorms.
This warning was issued primarly for the damaging outflow winds
ahead of the storms. There will be additional thunderstorms behind
this initial surge, that do not produce strong winds.
A Severe Thunderstorm Watch remains in effect until 700 PM CDT for
northwestern Illinois.
LAT...LON 4250 8940 4220 8940 4220 8969 4201 8969
4202 8991 4207 8982 4220 8976 4228 8969
4249 8951
TIME...MOT...LOC 2254Z 282DEG 42KT 4241 8920 4199 8963
$$
ErvinThe office that day
Everything else NWS Quad Cities, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 24, 3:42 PM CDT | Severe Thunderstorm Warning | DVN | Jo Daviess | 48 min |
| Aug 24, 4:17 PM CDT | Severe Thunderstorm Warning | DVN | Jo Daviess, Stephenson | 58 min |
| Aug 24, 5:23 PM CDT | Severe Thunderstorm Warning | DVN | Carroll, Henry, Rock Island, Whiteside | 37 min |
| Aug 24, 5:46 PM CDT | Severe Thunderstorm Warning | DVN | Bureau, Henry, Mercer, Rock Island, Whiteside | 44 min |
| Aug 24, 6:49 PM CDT | Special Weather Statement | DVN | Rock Island | 41 min |
| Aug 24, 2:21 PM CDT | Severe Thunderstorm Warning | DVN | Buchanan | 39 min |
| Aug 24, 2:49 PM CDT | Severe Thunderstorm Warning | DVN | Benton, Buchanan, Delaware, Jones, Linn | 56 min |
| Aug 24, 3:03 PM CDT | Severe Thunderstorm Warning | DVN | Buchanan, Delaware, Dubuque | 42 min |
| Aug 24, 3:38 PM CDT | Tornado Warning | DVN | Dubuque | 25 min |
| Aug 24, 4:07 PM CDT | Special Weather Statement | DVN | Cedar, Clinton, Jackson, Johnson | 23 min |
| Aug 24, 4:54 PM CDT | Special Weather Statement | DVN | Benton | 36 min |
| Aug 24, 5:05 PM CDT | Severe Thunderstorm Warning | DVN | Benton, Iowa | 40 min |
| Aug 24, 5:27 PM CDT | Special Weather Statement | DVN | Johnson | 48 min |
| Aug 24, 6:07 PM CDT | Severe Thunderstorm Warning | DVN | Cedar, Johnson, Linn | 38 min |
Nearby
Severe Thunderstorm Warnings in Illinois, 2021Severe Thunderstorm Warnings in Iowa, 2021Every severe thunderstorm warning in 2021
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.