Alert archive / Iowa / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 41, NWS Quad Cities, IA
NWS Quad Cities, IA issued this severe thunderstorm warning at Jul 9, 2021, 8:25 PM CDT for Henry County, Lee County, Van Buren County, Iowa; Clark County, Missouri. It was in force for 35 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
- Jul 9, 2021, 8:25 PM CDT (01:25 UTC)
- Expired
- Jul 9, 2021, 9:00 PM CDT
- In force
- 35 min
- Issued by
- NWS Quad Cities, IA
- Area
- Storm-based polygon
- Tornado
- Possible
- Hail
- 1.5 in
- Wind
- 60.0 mph
Counties Henry County, IA, Lee County, IA, Van Buren County, IA, Clark County, MO
The radar
The Quad Cities radar (KDVN), 134 km from the middle of the area, began a volume at 01:25 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 |
|---|---|---|---|
| Jul 9, 8:54 PM CDT | HAIL 1 | Donnellson, IA |
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 |
|---|---|---|---|
| Jul 9, 7:08 PM CDT | Severe Thunderstorm Watch | SPC | 3 hr |
The nearest sounding before it
Davenport, (KDVN), launched 00:00Z, 1.4 hours before the alert went out and 140 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
- 1111 m above ground
- 0-6 km bulk shear
- 50 kt
- 0-1 km storm-relative helicity
- 19 m²/s²
- 0-3 km storm-relative helicity
- 114 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.0
The text
As transmitted.
110
WUUS53 KDVN 100125
SVRDVN
IAC087-111-177-MOC045-100200-
/O.NEW.KDVN.SV.W.0041.210710T0125Z-210710T0200Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Quad Cities IA/IL
825 PM CDT Fri Jul 9 2021
The National Weather Service in the Quad Cities has issued a
* Severe Thunderstorm Warning for...
Southwestern Henry County in southeastern Iowa...
Eastern Van Buren County in southeastern Iowa...
Northwestern Lee County in southeastern Iowa...
Northwestern Clark County in northeastern Missouri...
* Until 900 PM CDT.
* At 825 PM CDT, a severe thunderstorm was located over Stockport, or
8 miles northeast of Keosauqua, moving southeast at 40 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.
* This severe thunderstorm will be near...
Bentonsport/Vernon around 830 PM CDT.
Bonaparte around 835 PM CDT.
Other locations in the path of this severe thunderstorm include
Donnellson, Croton and New Boston.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Prepare immediately for large hail and damaging winds. People outside
should move immediately to shelter inside a strong building. Stay
away from windows.
Large hail and damaging winds and 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 4086 9195 4090 9185 4090 9172 4093 9172
4094 9164 4060 9136 4050 9160 4046 9183
TIME...MOT...LOC 0125Z 329DEG 36KT 4081 9183
TORNADO...POSSIBLE
HAIL...1.50IN
WIND...60MPH
$$
Gibbs4 follow-up statements
014
WWUS53 KDVN 100131
SVSDVN
Severe Weather Statement
National Weather Service Quad Cities IA/IL
831 PM CDT Fri Jul 9 2021
IAC087-111-177-MOC045-100200-
/O.CON.KDVN.SV.W.0041.000000T0000Z-210710T0200Z/
Henry IA-Van Buren IA-Lee IA-Clark MO-
831 PM CDT Fri Jul 9 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 900 PM CDT
FOR SOUTHWESTERN HENRY...EASTERN VAN BUREN...NORTHWESTERN LEE AND
NORTHWESTERN CLARK COUNTIES...
At 831 PM CDT, a severe thunderstorm was located near Bonaparte, or 9
miles east of Keosauqua, moving southeast at 40 mph.
HAZARD...Two inch hail and 60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...People and animals outdoors will be injured. Expect hail
damage to roofs, siding, windows, and vehicles. Expect wind
damage to roofs, siding, and trees.
This severe storm will be near...
Bonaparte around 835 PM CDT.
Other locations in the path of this severe thunderstorm include
Donnellson, Croton and New Boston.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
This is a dangerous storm. Prepare immediately for large destructive
hail capable of producing significant damage. People outside should
move to a shelter, inside a strong building and away from windows.
Continuous cloud to ground lightning is occurring with this storm.
Move indoors immediately. Lightning is one of nature's leading
killers. Remember, if you can hear thunder, you are close enough to
be struck by lightning.
Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 4086 9195 4090 9185 4090 9172 4093 9172
4094 9164 4060 9136 4050 9160 4046 9183
TIME...MOT...LOC 0131Z 329DEG 36KT 4075 9179
TORNADO...POSSIBLE
HAIL...2.00IN
WIND...60MPH
$$
Gibbs801
WWUS53 KDVN 100136
SVSDVN
Severe Weather Statement
National Weather Service Quad Cities IA/IL
836 PM CDT Fri Jul 9 2021
IAC087-111-177-MOC045-100200-
/O.CON.KDVN.SV.W.0041.000000T0000Z-210710T0200Z/
Henry IA-Van Buren IA-Lee IA-Clark MO-
836 PM CDT Fri Jul 9 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 900 PM CDT
FOR SOUTHWESTERN HENRY...SOUTHEASTERN VAN BUREN...NORTHWESTERN LEE
AND NORTH CENTRAL CLARK COUNTIES...
At 836 PM CDT, a severe thunderstorm was located over Bonaparte, or
10 miles east of Keosauqua, moving southeast at 40 mph.
HAZARD...Two inch 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.
This severe storm will be near...
Donnellson and Croton around 850 PM CDT.
Other locations in the path of this severe thunderstorm include New
Boston.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
This is a dangerous storm. Prepare immediately for large destructive
hail capable of producing significant damage. People outside should
move to a shelter, inside a strong building and away from windows.
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 4078 9187 4083 9175 4085 9167 4086 9162
4087 9159 4060 9137 4050 9160 4047 9177
TIME...MOT...LOC 0136Z 329DEG 36KT 4071 9175
TORNADO...POSSIBLE
HAIL...2.00IN
WIND...60MPH
$$
Gibbs160
WWUS53 KDVN 100146
SVSDVN
Severe Weather Statement
National Weather Service Quad Cities IA/IL
846 PM CDT Fri Jul 9 2021
IAC087-100156-
/O.CAN.KDVN.SV.W.0041.000000T0000Z-210710T0200Z/
Henry IA-
846 PM CDT Fri Jul 9 2021
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN HENRY COUNTY IS
CANCELLED...
The severe thunderstorm which prompted the warning has moved out of
the warned area. Therefore, the warning has been cancelled.
A Severe Thunderstorm Watch remains in effect until midnight CDT for
southeastern Iowa...and northeastern Missouri.
LAT...LON 4070 9183 4080 9172 4081 9171 4081 9154
4060 9137 4050 9160 4047 9177
TIME...MOT...LOC 0146Z 329DEG 36KT 4063 9169
$$
IAC111-177-MOC045-100200-
/O.CON.KDVN.SV.W.0041.000000T0000Z-210710T0200Z/
Van Buren IA-Lee IA-Clark MO-
846 PM CDT Fri Jul 9 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 900 PM CDT
FOR SOUTHEASTERN VAN BUREN...NORTHWESTERN LEE AND NORTH CENTRAL CLARK
COUNTIES...
At 846 PM CDT, a severe thunderstorm was located over Croton, or 14
miles north of Kahoka, moving southeast at 40 mph.
HAZARD...Two inch 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.
This severe storm will be near...
Donnellson around 850 PM CDT.
Other locations in the path of this severe thunderstorm include New
Boston.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
This is a dangerous storm. Prepare immediately for large destructive
hail capable of producing significant damage. People outside should
move to a shelter, inside a strong building and away from windows.
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 4070 9183 4080 9172 4081 9171 4081 9154
4060 9137 4050 9160 4047 9177
TIME...MOT...LOC 0146Z 329DEG 36KT 4063 9169
TORNADO...POSSIBLE
HAIL...2.00IN
WIND...60MPH
$$
Gibbs009
WWUS53 KDVN 100159
SVSDVN
Severe Weather Statement
National Weather Service Quad Cities IA/IL
859 PM CDT Fri Jul 9 2021
IAC111-177-MOC045-100208-
/O.EXP.KDVN.SV.W.0041.000000T0000Z-210710T0200Z/
Van Buren IA-Lee IA-Clark MO-
859 PM CDT Fri Jul 9 2021
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN VAN BUREN...
NORTHWESTERN LEE AND NORTH CENTRAL CLARK COUNTIES WILL EXPIRE AT 900
PM CDT...
The storm which prompted the warning has moved out of the area.
Therefore, the warning will be allowed to expire.
A Severe Thunderstorm Watch remains in effect until midnight CDT for
southeastern Iowa...and northeastern Missouri.
To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
the Quad Cities.
Remember, a Severe Thunderstorm Warning still remains in effect for
Lee and Clark Counties.
LAT...LON 4070 9183 4080 9172 4081 9171 4081 9154
4060 9137 4050 9160 4047 9177
TIME...MOT...LOC 0158Z 329DEG 36KT 4053 9161
$$
GibbsThe office that day
Everything else NWS Quad Cities, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 9, 7:08 PM CDT | Severe Thunderstorm Warning | DVN | Des Moines, Henry, Lee | 37 min |
| Jul 9, 7:19 PM CDT | Severe Thunderstorm Warning | DVN | Lee | 41 min |
| Jul 9, 7:29 PM CDT | Severe Thunderstorm Warning | DVN | Iowa, Johnson, Keokuk, Louisa, Washington | 31 min |
| Jul 9, 7:51 PM CDT | Severe Thunderstorm Warning | DVN | Henry, Jefferson, Keokuk, Washington | 24 min |
| Jul 9, 8:57 PM CDT | Severe Thunderstorm Warning | DVN | Lee | 33 min |
| Jul 10, 4:25 AM CDT | Special Weather Statement | DVN | Jefferson, Keokuk, Van Buren | 95 min |
Nearby
Severe Thunderstorm Warnings in Iowa, 2021Severe Thunderstorm Warnings in Missouri, 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.