Alert archive / Illinois / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 95, NWS Quad Cities, IA
NWS Quad Cities, IA issued this severe thunderstorm warning at Aug 24, 2021, 5:46 PM CDT for 5 counties in Illinois. It was in force for 44 min. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Aug 24, 2021, 5:46 PM CDT (22:46 UTC)
- Expired
- Aug 24, 2021, 6:30 PM CDT
- In force
- 44 min
- Issued by
- NWS Quad Cities, IA
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties Bureau County, IL, Henry County, IL, Mercer County, IL, Rock Island County, IL, Whiteside County, IL
The radar
The Quad Cities radar (KDVN), 70 km from the middle of the area, began a volume at 22:48 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.
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, 10.8 hours before the alert went out and 64 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.
637
WUUS53 KDVN 242246
SVRDVN
ILC011-073-131-161-195-242330-
/O.NEW.KDVN.SV.W.0095.210824T2246Z-210824T2330Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Quad Cities IA/IL
546 PM CDT Tue Aug 24 2021
The National Weather Service in the Quad Cities has issued a
* Severe Thunderstorm Warning for...
Southeastern Rock Island County in northwestern Illinois...
Northeastern Mercer County in northwestern Illinois...
Southeastern Whiteside County in northwestern Illinois...
Henry County in northwestern Illinois...
Bureau County in north central Illinois...
* Until 630 PM CDT.
* At 545 PM CDT, severe thunderstorms were located along a line
extending from near Dixon to near Sherrard, moving southeast at 55
mph.
HAZARD...60 mph wind gusts.
SOURCE...Trained weather spotters.
IMPACT...Expect damage to roofs, siding, and trees.
* Severe thunderstorms will be near...
Woodhull around 600 PM CDT.
Cambridge around 605 PM CDT.
Other locations in the path of these severe thunderstorms include
Galva and Kewanee.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
sturdy building.
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.
&&
LAT...LON 4120 8964 4123 8964 4123 8987 4115 8987
4115 9044 4137 9074 4154 9022 4183 8963
4159 8963 4158 8917 4139 8917
TIME...MOT...LOC 2245Z 293DEG 47KT 4186 8955 4136 9048
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
Ervin4 follow-up statements
305
WWUS53 KDVN 242303
SVSDVN
Severe Weather Statement
National Weather Service Quad Cities IA/IL
603 PM CDT Tue Aug 24 2021
ILC011-073-131-161-195-242330-
/O.CON.KDVN.SV.W.0095.000000T0000Z-210824T2330Z/
Rock Island IL-Mercer IL-Whiteside IL-Henry IL-Bureau IL-
603 PM CDT Tue Aug 24 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 630 PM CDT
FOR SOUTH CENTRAL ROCK ISLAND...NORTHEASTERN MERCER...SOUTHEASTERN
WHITESIDE...HENRY AND BUREAU COUNTIES...
At 602 PM CDT, outflow from severe thunderstorms were located along
a line extending from near Amboy to near Cambridge, moving southeast
at 55 mph.
HAZARD...60 mph wind gusts.
SOURCE...Trained weather spotters.
IMPACT...Expect damage to roofs, siding, and trees.
Locations impacted include...
Kewanee.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Wind damage with these storms will occur before any rain or
lightning. Do not wait for the sound of thunder before taking cover.
SEEK SHELTER IMMEDIATELY inside a sturdy structure and stay away from
windows.
&&
LAT...LON 4120 8964 4123 8964 4123 8987 4115 8987
4115 9044 4135 9072 4149 9016 4175 8963
4159 8963 4158 8917 4139 8917
TIME...MOT...LOC 2302Z 293DEG 47KT 4177 8928 4127 9021
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
Ervin738
WWUS53 KDVN 242310
SVSDVN
Severe Weather Statement
National Weather Service Quad Cities IA/IL
610 PM CDT Tue Aug 24 2021
ILC011-073-131-161-195-242330-
/O.CON.KDVN.SV.W.0095.000000T0000Z-210824T2330Z/
Rock Island IL-Mercer IL-Whiteside IL-Henry IL-Bureau IL-
610 PM CDT Tue Aug 24 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 630 PM CDT
FOR SOUTH CENTRAL ROCK ISLAND...NORTHEASTERN MERCER...SOUTHEASTERN
WHITESIDE...HENRY AND BUREAU COUNTIES...
At 610 PM CDT, severe thunderstorms were located along a line
extending from 9 miles west of Paw Paw to near Galva, moving
southeast at 55 mph.
HAZARD...60 mph wind gusts.
SOURCE...Trained weather spotters.
IMPACT...Expect damage to roofs, siding, and trees.
These severe thunderstorms will remain over mainly rural areas of
south central Rock Island, northeastern Mercer, southeastern
Whiteside, Henry and Bureau Counties, including the following
locations... Preemption, Seatonville, Henry County Fairgrounds,
Ophiem, Cherry, German Corner, Coal Hollow, Kasbeer, Manlius and
Nekoma.
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.
&&
LAT...LON 4120 8964 4123 8964 4123 8987 4115 8987
4115 9044 4133 9069 4141 9005 4167 8963
4159 8963 4158 8917 4139 8917
TIME...MOT...LOC 2310Z 293DEG 47KT 4173 8915 4123 9008
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
Ervin635
WWUS53 KDVN 242320
SVSDVN
Severe Weather Statement
National Weather Service Quad Cities IA/IL
620 PM CDT Tue Aug 24 2021
ILC131-161-195-242329-
/O.CAN.KDVN.SV.W.0095.000000T0000Z-210824T2330Z/
Rock Island IL-Mercer IL-Whiteside IL-
620 PM CDT Tue Aug 24 2021
...THE SEVERE THUNDERSTORM WARNING FOR SOUTH CENTRAL ROCK ISLAND...
NORTHEASTERN MERCER AND SOUTHEASTERN WHITESIDE COUNTIES IS
CANCELLED...
The storms which prompted the warning have moved out of the warned
area. Therefore, the warning has been cancelled.
This warning was issued primarly for the damaging outflow winds
ahead of the storms. There will be additional thunderstorms behind
this initial surge, that do not produce strong winds.
LAT...LON 4120 8964 4123 8964 4123 8987 4115 8987
4115 9044 4123 9040 4136 8988 4152 8966
4158 8955 4158 8917 4139 8917
TIME...MOT...LOC 2319Z 293DEG 47KT 4169 8902 4119 8995
$$
ILC011-073-242330-
/O.CON.KDVN.SV.W.0095.000000T0000Z-210824T2330Z/
Henry IL-Bureau IL-
620 PM CDT Tue Aug 24 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 630 PM CDT
FOR SOUTHERN HENRY AND BUREAU COUNTIES...
At 619 PM CDT, severe thunderstorms were located along a line
extending from near Paw Paw to near Kewanee, moving southeast at 55
mph.
HAZARD...60 mph wind gusts.
SOURCE...Trained weather spotters.
IMPACT...Expect damage to roofs, siding, and trees.
These severe thunderstorms will remain over mainly rural areas of
southern Henry and Bureau Counties, including the following
locations... Mineral, Seatonville, Bishop Hill, Providence, Cherry,
German Corner, Dover, Coal Hollow, Zearing and Kasbeer.
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.
&&
LAT...LON 4120 8964 4123 8964 4123 8987 4115 8987
4115 9044 4123 9040 4136 8988 4152 8966
4158 8955 4158 8917 4139 8917
TIME...MOT...LOC 2319Z 293DEG 47KT 4169 8902 4119 8995
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
Ervin271
WWUS53 KDVN 242324
SVSDVN
Severe Weather Statement
National Weather Service Quad Cities IA/IL
624 PM CDT Tue Aug 24 2021
ILC011-073-242333-
/O.EXP.KDVN.SV.W.0095.000000T0000Z-210824T2330Z/
Henry IL-Bureau IL-
624 PM CDT Tue Aug 24 2021
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHERN HENRY AND BUREAU
COUNTIES WILL EXPIRE AT 630 PM CDT...
The storms which prompted the warning have weakened. Therefore, the
warning will be allowed to expire.
This warning was issued primarly for the damaging outflow winds
ahead of the storms. There will be additional thunderstorms behind
this initial surge, that do not produce strong winds.
LAT...LON 4120 8964 4123 8964 4123 8987 4115 8987
4115 9044 4123 9040 4136 8988 4152 8966
4158 8955 4158 8917 4139 8917
TIME...MOT...LOC 2323Z 293DEG 47KT 4168 8898 4118 8991
$$
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, 5:01 PM CDT | Severe Thunderstorm Warning | DVN | Carroll, Jo Daviess, Stephenson | 59 min |
| Aug 24, 5:23 PM CDT | Severe Thunderstorm Warning | DVN | Carroll, Henry, Rock Island, Whiteside | 37 min |
| Aug 24, 6:49 PM CDT | Special Weather Statement | DVN | Rock Island | 41 min |
Nearby
Severe Thunderstorm Warnings in Illinois, 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.