Alert archive / Illinois / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 94, NWS Quad Cities, IA
NWS Quad Cities, IA issued this severe thunderstorm warning at Aug 24, 2021, 5:23 PM CDT for 4 counties in Illinois; Clinton County, Scott County, Iowa. It was in force for 37 min. 1 report 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, 5:23 PM CDT (22:23 UTC)
- Expired
- Aug 24, 2021, 6:00 PM CDT
- In force
- 37 min
- Issued by
- NWS Quad Cities, IA
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties Clinton County, IA, Scott County, IA, Carroll County, IL, Henry County, IL, Rock Island County, IL, Whiteside County, IL
The radar
The Quad Cities radar (KDVN), 40 km from the middle of the area, began a volume at 22:24 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, 5:24 PM CDT | TSTM WND GST 48 | Davenport Municipality, IA | ASOS STATION KDVN DAVENPORT ARPT. |
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, 10.4 hours before the alert went out and 34 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.
659
WUUS53 KDVN 242223
SVRDVN
ILC015-073-161-195-IAC045-163-242300-
/O.NEW.KDVN.SV.W.0094.210824T2223Z-210824T2300Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Quad Cities IA/IL
523 PM CDT Tue Aug 24 2021
The National Weather Service in the Quad Cities has issued a
* Severe Thunderstorm Warning for...
Northeastern Rock Island County in northwestern Illinois...
Whiteside County in northwestern Illinois...
Northwestern Henry County in northwestern Illinois...
Southeastern Carroll County in northwestern Illinois...
Scott County in east central Iowa...
Eastern Clinton County in east central Iowa...
* Until 600 PM CDT.
* At 522 PM CDT, severe thunderstorms were located along a line
extending from near Fairhaven to Garden Plain to Davenport, moving
southeast at 40 mph.
HAZARD...60 mph wind gusts.
SOURCE...Trained weather spotters.
IMPACT...Expect damage to roofs, siding, and trees.
* Severe thunderstorms will be near...
Erie, Fairhaven, Chadwick and Argo Fay around 530 PM CDT.
Morrison, Milledgeville and Coleta around 535 PM CDT.
Prophetstown, Rapids City and Lyndon around 540 PM CDT.
Other locations in the path of these severe thunderstorms include
Cleveland, Osborn, Emerson, Rock Falls and Sterling.
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 4145 9027 4147 9078 4163 9071 4203 9043
4203 9029 4201 8969 4193 8969 4193 8963
4170 8963
TIME...MOT...LOC 2222Z 292DEG 34KT 4198 8997 4177 9014 4154 9057
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
Ervin3 follow-up statements
387
WWUS53 KDVN 242231 RRA
SVSDVN
Severe Weather Statement
National Weather Service Quad Cities IA/IL
531 PM CDT Tue Aug 24 2021
ILC015-073-161-195-IAC045-163-242300-
/O.CON.KDVN.SV.W.0094.000000T0000Z-210824T2300Z/
Rock Island IL-Whiteside IL-Henry IL-Carroll IL-Scott IA-Clinton IA-
531 PM CDT Tue Aug 24 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 600 PM CDT
FOR NORTHEASTERN ROCK ISLAND...WHITESIDE...NORTHWESTERN HENRY...
SOUTHEASTERN CARROLL...SCOTT AND EASTERN CLINTON COUNTIES...
At 531 PM CDT, severe thunderstorms were located along a line
extending from near Fairhaven to near Erie to Riverdale, moving east
at 40 mph.
HAZARD...60 mph wind gusts.
SOURCE...Trained weather spotters.
IMPACT...Expect damage to roofs, siding, and trees.
These severe storms will be near...
Morrison, Erie, Fairhaven and Chadwick around 535 PM CDT.
Prophetstown, Milledgeville, Rapids City, Lyndon and Coleta around
540 PM CDT.
Other locations in the path of these severe thunderstorms include
Osborn, Emerson and Sterling.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Wind damage with these storms will occur before any rain or
lightning. Do not wait for the sound of thunder before taking cover.
SEEK SHELTER IMMEDIATELY inside a sturdy structure and stay away from
windows.
&&
LAT...LON 4145 9027 4147 9078 4163 9071 4203 9043
4203 9029 4201 8969 4193 8969 4193 8963
4170 8963
TIME...MOT...LOC 2231Z 292DEG 34KT 4195 8987 4174 9004 4151 9047
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
Ervin744
WWUS53 KDVN 242237
SVSDVN
Severe Weather Statement
National Weather Service Quad Cities IA/IL
537 PM CDT Tue Aug 24 2021
ILC015-073-161-195-IAC045-163-242300-
/O.CON.KDVN.SV.W.0094.000000T0000Z-210824T2300Z/
Rock Island IL-Whiteside IL-Henry IL-Carroll IL-Scott IA-Clinton IA-
537 PM CDT Tue Aug 24 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 600 PM CDT
FOR NORTHEASTERN ROCK ISLAND...WHITESIDE...NORTHWESTERN HENRY...
SOUTHEASTERN CARROLL...CENTRAL SCOTT AND SOUTHEASTERN CLINTON
COUNTIES...
At 537 PM CDT, severe thunderstorms were located along a line
extending from Coleta to near Lyndon to Silvis, moving east at 40
mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
These severe storms will be near...
Morrison, Prophetstown, Milledgeville, Lyndon and Coleta around
540 PM CDT.
Emerson around 545 PM CDT.
Other locations in the path of these severe thunderstorms include
Sterling.
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 4145 9027 4147 9078 4163 9071 4184 9025
4202 9004 4201 8969 4193 8969 4193 8963
4170 8963
TIME...MOT...LOC 2237Z 292DEG 34KT 4193 8980 4172 8997 4149 9040
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
Ervin360
WWUS53 KDVN 242253
SVSDVN
Severe Weather Statement
National Weather Service Quad Cities IA/IL
553 PM CDT Tue Aug 24 2021
IAC045-163-ILC015-073-161-195-242302-
/O.EXP.KDVN.SV.W.0094.000000T0000Z-210824T2300Z/
Rock Island IL-Whiteside IL-Henry IL-Carroll IL-Scott IA-Clinton IA-
553 PM CDT Tue Aug 24 2021
...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN ROCK ISLAND...
WHITESIDE...NORTHWESTERN HENRY...SOUTHEASTERN CARROLL...CENTRAL SCOTT
AND SOUTHEASTERN CLINTON COUNTIES WILL EXPIRE AT 600 PM CDT...
The storms which prompted the warning have weakened below severe
limits, and have exited the warned area. Therefore, the warning will
be allowed to expire. However gusty winds and heavy rain are still
possible with these thunderstorms.
This warning was issued primarly for the damaging outflow winds
ahead of the storms. There will be additional thunderstorms behind
this initial surge, that do not produce strong winds.
A Severe Thunderstorm Watch remains in effect until 700 PM CDT for
northwestern Illinois...and east central Iowa.
LAT...LON 4145 9027 4147 9078 4163 9071 4184 9025
4202 9004 4201 8969 4193 8969 4193 8963
4170 8963
TIME...MOT...LOC 2252Z 292DEG 34KT 4188 8963 4167 8980 4144 9023
$$
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, 5:46 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.