Alert archive / Iowa / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 86, NWS Quad Cities, IA
NWS Quad Cities, IA issued this severe thunderstorm warning at Aug 12, 2021, 7:26 AM CDT for Van Buren County, Iowa. It was in force for 33 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 12, 2021, 7:26 AM CDT (12:26 UTC)
- Expired
- Aug 12, 2021, 7:59 AM CDT
- In force
- 33 min
- Issued by
- NWS Quad Cities, IA
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 50.0 mph
County Van Buren County, IA
The radar
The Quad Cities radar (KDVN), 152 km from the middle of the area, began a volume at 12:28 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 12, 7:50 AM CDT | HAIL 1 | Farmington, IA | DELAYED REPORT. TIME ESTIMATED FROM RADAR. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Davenport, (KDVN), launched 12:00Z, 0.4 hours before the alert went out and 158 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 2463 m above ground
- 0-6 km bulk shear
- 30 kt
- 0-1 km storm-relative helicity
- 27 m²/s²
- 0-3 km storm-relative helicity
- 71 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
102
WUUS53 KDVN 121226
SVRDVN
IAC177-121315-
/O.NEW.KDVN.SV.W.0086.210812T1226Z-210812T1315Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Quad Cities IA/IL
726 AM CDT Thu Aug 12 2021
The National Weather Service in the Quad Cities has issued a
* Severe Thunderstorm Warning for...
Van Buren County in southeastern Iowa...
* Until 815 AM CDT.
* At 726 AM CDT, a severe thunderstorm was located over Keosauqua,
moving east at 25 mph.
HAZARD...Quarter size hail.
SOURCE...Radar indicated.
IMPACT...Damage to vehicles is expected.
* This severe thunderstorm will be near...
Keosauqua around 735 AM CDT.
Other locations in the path of this severe thunderstorm include
Stockport, Bentonsport/Vernon and Bonaparte.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
sturdy 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 4081 9218 4088 9174 4061 9172 4061 9176
4060 9218
TIME...MOT...LOC 1226Z 262DEG 20KT 4074 9202
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...<50 MPH
$$
Ervin6 follow-up statements
210
WWUS53 KDVN 121233
SVSDVN
Severe Weather Statement
National Weather Service Quad Cities IA/IL
733 AM CDT Thu Aug 12 2021
IAC177-121315-
/O.CON.KDVN.SV.W.0086.000000T0000Z-210812T1315Z/
Van Buren IA-
733 AM CDT Thu Aug 12 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 815 AM CDT
FOR VAN BUREN COUNTY...
At 733 AM CDT, a severe thunderstorm was located over Keosauqua,
moving east at 25 mph.
HAZARD...Ping pong ball size hail and 60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...People and animals outdoors will be injured. Expect hail
damage to roofs, siding, windows, and vehicles. Expect wind
damage to roofs, siding, and trees.
Locations impacted include...
Bentonsport/Vernon, Bonaparte and Stockport.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Continuous cloud to ground lightning is occurring with this storm.
Move indoors immediately. Lightning is one of nature's leading
killers. Remember, if you can hear thunder, you are close enough to
be struck by lightning.
Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 4081 9218 4088 9174 4061 9172 4061 9176
4060 9218
TIME...MOT...LOC 1233Z 262DEG 20KT 4075 9197
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.50 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
Ervin300
WWUS53 KDVN 121241
SVSDVN
Severe Weather Statement
National Weather Service Quad Cities IA/IL
741 AM CDT Thu Aug 12 2021
IAC177-121315-
/O.CON.KDVN.SV.W.0086.000000T0000Z-210812T1315Z/
Van Buren IA-
741 AM CDT Thu Aug 12 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 815 AM CDT
FOR VAN BUREN COUNTY...
At 741 AM CDT, a severe thunderstorm was located over Keosauqua,
moving east at 20 mph.
HAZARD...Ping pong ball size hail and 60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...People and animals outdoors will be injured. Expect hail
damage to roofs, siding, windows, and vehicles. Expect wind
damage to roofs, siding, and trees.
Locations impacted include...
Bentonsport/Vernon, Stockport and Bonaparte.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
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 4081 9218 4088 9174 4061 9172 4061 9176
4060 9218
TIME...MOT...LOC 1241Z 267DEG 17KT 4073 9194
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.50 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
Ervin707
WWUS53 KDVN 121244
SVSDVN
Severe Weather Statement
National Weather Service Quad Cities IA/IL
744 AM CDT Thu Aug 12 2021
IAC177-121315-
/O.CON.KDVN.SV.W.0086.000000T0000Z-210812T1315Z/
Van Buren IA-
744 AM CDT Thu Aug 12 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 815 AM CDT
FOR EASTERN VAN BUREN COUNTY...
At 744 AM CDT, a severe thunderstorm was located over
Bentonsport/Vernon, or near Keosauqua, moving east at 25 mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Radar indicated.
IMPACT...Hail damage to vehicles is expected. Expect wind damage to
roofs, siding, and trees.
This severe storm will be near...
Bonaparte around 755 AM CDT.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Continuous cloud to ground lightning is occurring with this storm.
Move indoors immediately. Lightning is one of nature's leading
killers. Remember, if you can hear thunder, you are close enough to
be struck by lightning.
Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 4084 9197 4088 9174 4061 9172 4061 9176
4060 9207
TIME...MOT...LOC 1244Z 268DEG 20KT 4073 9189
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
Ervin754
WWUS53 KDVN 121248
SVSDVN
Severe Weather Statement
National Weather Service Quad Cities IA/IL
748 AM CDT Thu Aug 12 2021
IAC177-121315-
/O.CON.KDVN.SV.W.0086.000000T0000Z-210812T1315Z/
Van Buren IA-
748 AM CDT Thu Aug 12 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 815 AM CDT
FOR EASTERN VAN BUREN COUNTY...
At 747 AM CDT, a severe thunderstorm was located over
Bentonsport/Vernon, or near Keosauqua, moving east at 25 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.
This severe storm will be near...
Bonaparte around 755 AM CDT.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
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 4084 9197 4088 9174 4061 9172 4061 9176
4060 9207
TIME...MOT...LOC 1247Z 271DEG 20KT 4072 9186
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
Ervin303 WWUS53 KDVN 121256 SVSDVN Severe Weather Statement National Weather Service Quad Cities IA/IL 756 AM CDT Thu Aug 12 2021 IAC177-121315- /O.CON.KDVN.SV.W.0086.000000T0000Z-210812T1315Z/ Van Buren IA- 756 AM CDT Thu Aug 12 2021 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 815 AM CDT FOR EASTERN VAN BUREN COUNTY... At 756 AM CDT, a severe thunderstorm was located over Bonaparte, or 8 miles east of Keosauqua, moving east at 25 mph. HAZARD...60 mph wind gusts. SOURCE...Radar indicated. IMPACT...Expect damage to roofs, siding, and trees. This severe thunderstorm will remain over mainly rural areas of eastern Van Buren County, including the following locations... Farmington, Indian Lake Park and Utica. PRECAUTIONARY/PREPAREDNESS ACTIONS... Continuous cloud to ground lightning is occurring with this storm. Move indoors immediately. Lightning is one of nature's leading killers. Remember, if you can hear thunder, you are close enough to be struck by lightning. Torrential rainfall is occurring with this storm, and may lead to flash flooding. Do not drive your vehicle through flooded roadways. && LAT...LON 4085 9190 4088 9174 4061 9172 4061 9192 TIME...MOT...LOC 1256Z 271DEG 20KT 4072 9180 HAIL THREAT...RADAR INDICATED MAX HAIL SIZE...<.75 IN WIND THREAT...RADAR INDICATED MAX WIND GUST...60 MPH $$ Ervin
551
WWUS53 KDVN 121259
SVSDVN
Severe Weather Statement
National Weather Service Quad Cities IA/IL
759 AM CDT Thu Aug 12 2021
IAC177-121309-
/O.CAN.KDVN.SV.W.0086.000000T0000Z-210812T1315Z/
Van Buren IA-
759 AM CDT Thu Aug 12 2021
...THE SEVERE THUNDERSTORM WARNING FOR EASTERN VAN BUREN COUNTY IS
CANCELLED...
The severe thunderstorm which prompted the warning has weakened.
Therefore, the warning has been cancelled. However gusty winds and
heavy rain are still possible with this thunderstorm.
LAT...LON 4085 9190 4088 9174 4061 9172 4061 9192
TIME...MOT...LOC 1257Z 262DEG 20KT 4072 9177
$$
ErvinThe office that day
Everything else NWS Quad Cities, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 12, 2:09 AM CDT | Special Weather Statement | DVN | Lee | 21 min |
| Aug 12, 2:57 AM CDT | Heat Advisory | DVN | Lee | 8 hr |
| Aug 12, 7:24 AM CDT | Special Weather Statement | DVN | Van Buren | 36 min |
| Aug 12, 9:10 AM CDT | Special Weather Statement | DVN | Van Buren | 50 min |
| Aug 12, 9:23 AM CDT | Flash Flood Warning | DVN | Van Buren | 4 hr |
| Aug 12, 9:54 AM CDT | Special Weather Statement | DVN | Lee, Van Buren | 96 min |
| Aug 12, 10:32 AM CDT | Flash Flood Warning | DVN | Lee, Van Buren | 6 hr |
| Aug 12, 11:29 AM CDT | Special Weather Statement | DVN | Lee, Van Buren | 91 min |
| Aug 12, 12:44 PM CDT | Flash Flood Watch | DVN | Des Moines, Lee, Van Buren | 8 hr |
Nearby
Severe 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.