Alert archive / Iowa / Tornado Warnings in 2021
Tornado Warning 3, NWS Quad Cities, IA
NWS Quad Cities, IA issued this tornado warning at Jun 20, 2021, 7:48 PM CDT for Dubuque County, Jackson County, Jones County, Iowa. It was in force for 42 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
- Jun 20, 2021, 7:48 PM CDT (00:48 UTC)
- Expired
- Jun 20, 2021, 8:30 PM CDT
- In force
- 42 min
- Issued by
- NWS Quad Cities, IA
- Area
- Storm-based polygon
- Tornado
- Radar indicated
- Hail
- 0.75 in
Counties Dubuque County, IA, Jackson County, IA, Jones County, IA
The radar
The Quad Cities radar (KDVN), 81 km from the middle of the area, began a volume at 00:52 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 |
|---|---|---|---|
| Jun 20, 8:02 PM CDT | TSTM WND GST 55 | Cascade, IA | |
| Jun 20, 8:06 PM CDT | TORNADO | 1 W Garry Owen, IA | A TORNADO DEVELOPED JUST WEST OF GARRY OWEN IN NORTHWEST JACKSON COUNTY, AND MOVED NORTHEAST ALONG AN INTERMITTENT 3 MILE PATH THROUGH FARM FIELDS, LIFTING EAST OF BERNARD IN SOUTHERN DUBUQUE COUNTY. THE TORNADO CAUSED TREE DAMAGE, AND EXTENSIVE DAMAGE TO OUTB |
| Jun 20, 8:09 PM CDT | TSTM WND DMG | 1 Nne Garry Owen, IA | POWER LINES AND BUILDINGS DOWN ON MCDEVITT LANE. POSSIBLE TORNADO. |
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 |
|---|---|---|---|
| Jun 20, 4:01 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
The nearest sounding before it
Davenport, (KDVN), launched 00:00Z, 0.8 hours before the alert went out and 82 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
- 1058 J/kg
- Mixed-layer CIN
- -19 J/kg
- Mixed-layer LCL
- 1009 m above ground
- 0-6 km bulk shear
- 52 kt
- 0-1 km storm-relative helicity
- 174 m²/s²
- 0-3 km storm-relative helicity
- 230 m²/s²
- Significant tornado parameter
- 1.4
- Supercell composite
- 7.8
The text
As transmitted.
162
WFUS53 KDVN 210048
TORDVN
IAC061-097-105-210130-
/O.NEW.KDVN.TO.W.0003.210621T0048Z-210621T0130Z/
BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Quad Cities IA/IL
748 PM CDT Sun Jun 20 2021
The National Weather Service in the Quad Cities has issued a
* Tornado Warning for...
Western Jackson County in east central Iowa...
Southwestern Dubuque County in northeastern Iowa...
Northeastern Jones County in east central Iowa...
* Until 830 PM CDT.
* At 747 PM CDT, a severe thunderstorm capable of producing a tornado
was located near Cascade, or 18 miles northeast of Anamosa, moving
southeast at 35 mph.
HAZARD...Tornado.
SOURCE...Radar indicated rotation.
IMPACT...Flying debris will be dangerous to those caught without
shelter. Mobile homes will be damaged or destroyed.
Damage to roofs, windows, and vehicles will occur. Tree
damage is likely.
* This dangerous storm will be near...
Bernard and Canton around 810 PM CDT.
Zwingle around 820 PM CDT.
La Motte and Fulton around 825 PM CDT.
Other locations impacted by this tornadic thunderstorm include
Emeline, Otter Creek, Crab Town, South Gary Owen, Ironhills,
Fillmore, Garry Owen, Washington Mills, Temple Hill and Fillmore
Recreation Area.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.
Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 4233 9058 4207 9072 4224 9117 4230 9114
4230 9113 4231 9113 4240 9108
TIME...MOT...LOC 0047Z 293DEG 31KT 4233 9107
TORNADO...RADAR INDICATED
HAIL...<.75IN
$$
RP Kinney4 follow-up statements
333
WWUS53 KDVN 210056
SVSDVN
Severe Weather Statement
National Weather Service Quad Cities IA/IL
756 PM CDT Sun Jun 20 2021
IAC061-097-105-210130-
/O.CON.KDVN.TO.W.0003.000000T0000Z-210621T0130Z/
Jackson IA-Dubuque IA-Jones IA-
756 PM CDT Sun Jun 20 2021
...A TORNADO WARNING REMAINS IN EFFECT UNTIL 830 PM CDT FOR WESTERN
JACKSON...SOUTHWESTERN DUBUQUE AND NORTHEASTERN JONES COUNTIES...
At 755 PM CDT, a severe thunderstorm capable of producing a tornado
was located over Cascade, or 20 miles northeast of Anamosa, moving
southeast at 35 mph.
HAZARD...Tornado.
SOURCE...Radar indicated rotation.
IMPACT...Flying debris will be dangerous to those caught without
shelter. Mobile homes will be damaged or destroyed. Damage
to roofs, windows, and vehicles will occur. Tree damage is
likely.
This dangerous storm will be near...
Bernard around 805 PM CDT.
Canton around 810 PM CDT.
Zwingle around 820 PM CDT.
La Motte and Fulton around 825 PM CDT.
Other locations impacted by this tornadic thunderstorm include
Emeline, Otter Creek, Crab Town, South Gary Owen, Ironhills,
Fillmore, Garry Owen, Washington Mills, Temple Hill and Fillmore
Recreation Area.
This storm may also produce damaging straight line winds around 70
mph.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.
Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 4233 9058 4207 9072 4224 9117 4230 9114
4230 9113 4231 9113 4240 9108
TIME...MOT...LOC 0055Z 293DEG 31KT 4230 9098
TORNADO...RADAR INDICATED
HAIL...<.75IN
$$
RP Kinney312
WWUS53 KDVN 210112
SVSDVN
Severe Weather Statement
National Weather Service Quad Cities IA/IL
812 PM CDT Sun Jun 20 2021
IAC061-097-105-210130-
/O.CON.KDVN.TO.W.0003.000000T0000Z-210621T0130Z/
Jackson IA-Dubuque IA-Jones IA-
812 PM CDT Sun Jun 20 2021
...A TORNADO WARNING REMAINS IN EFFECT UNTIL 830 PM CDT FOR WESTERN
JACKSON...SOUTH CENTRAL DUBUQUE AND NORTHEASTERN JONES COUNTIES...
At 811 PM CDT, a confirmed tornado was located over Bernard, or 15
miles south of Dubuque, moving east at 35 mph.
HAZARD...Damaging tornado.
SOURCE...Emergency management confirmed tornado.
IMPACT...Flying debris will be dangerous to those caught without
shelter. Mobile homes will be damaged or destroyed. Damage
to roofs, windows, and vehicles will occur. Tree damage is
likely.
This tornado will be near...
Zwingle around 820 PM CDT.
La Motte and Fulton around 825 PM CDT.
Other locations impacted by this tornadic thunderstorm include
Emeline, Otter Creek, Crab Town, South Gary Owen, Ironhills,
Fillmore, Garry Owen, Washington Mills, Temple Hill and Fillmore
Recreation Area.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
To repeat, a tornado is on the ground. TAKE COVER NOW! Move to a
basement or an interior room on the lowest floor of a sturdy
building. Avoid windows. If you are outdoors, in a mobile home, or in
a vehicle, move to the closest substantial shelter and protect
yourself from flying debris.
Tornadoes are extremely difficult to see and confirm at night. Do not
wait to see or hear the tornado. TAKE COVER NOW!
Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 4233 9058 4207 9072 4219 9103 4228 9099
4238 9092
TIME...MOT...LOC 0111Z 287DEG 31KT 4229 9079
TORNADO...OBSERVED
HAIL...<.75IN
$$
RP Kinney729
WWUS53 KDVN 210122
SVSDVN
Severe Weather Statement
National Weather Service Quad Cities IA/IL
822 PM CDT Sun Jun 20 2021
IAC105-210132-
/O.CAN.KDVN.TO.W.0003.000000T0000Z-210621T0130Z/
Jones IA-
822 PM CDT Sun Jun 20 2021
...THE TORNADO WARNING FOR NORTHEASTERN JONES COUNTY IS CANCELLED...
The tornadic thunderstorm which prompted the warning has moved out
of the warned area. Therefore, the warning has been cancelled.
A Severe Thunderstorm Watch remains in effect until 1100 PM CDT for
northeastern and east central Iowa.
LAT...LON 4224 9063 4225 9089 4236 9085 4232 9058
TIME...MOT...LOC 0122Z 277DEG 27KT 4229 9069
$$
IAC061-097-210130-
/O.CON.KDVN.TO.W.0003.000000T0000Z-210621T0130Z/
Jackson IA-Dubuque IA-
822 PM CDT Sun Jun 20 2021
...A TORNADO WARNING REMAINS IN EFFECT UNTIL 830 PM CDT FOR
NORTHWESTERN JACKSON AND SOUTH CENTRAL DUBUQUE COUNTIES...
At 822 PM CDT, a confirmed tornado was located over Zwingle, or 15
miles south of Dubuque, moving east at 30 mph.
HAZARD...Damaging tornado.
SOURCE...Emergency management confirmed tornado.
IMPACT...Flying debris will be dangerous to those caught without
shelter. Mobile homes will be damaged or destroyed. Damage
to roofs, windows, and vehicles will occur. Tree damage is
likely.
This tornado will be near...
Zwingle and La Motte around 830 PM CDT.
Other locations impacted by this tornadic thunderstorm include
Washington Mills and Garry Owen.
At 810 pm, Emergency management reported a tornado caused structure
and power line damage near McDevitt Lane along the Dubuque and
Jackson County border.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
To repeat, a tornado is on the ground. TAKE COVER NOW! Move to a
basement or an interior room on the lowest floor of a sturdy
building. Avoid windows. If you are outdoors, in a mobile home, or in
a vehicle, move to the closest substantial shelter and protect
yourself from flying debris.
Tornadoes are extremely difficult to see and confirm at night. Do not
wait to see or hear the tornado. TAKE COVER NOW!
Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 4224 9063 4225 9089 4236 9085 4232 9058
TIME...MOT...LOC 0122Z 277DEG 27KT 4229 9069
TORNADO...OBSERVED
HAIL...<.75IN
$$
RP Kinney022
WWUS53 KDVN 210132
SVSDVN
Severe Weather Statement
National Weather Service Quad Cities IA/IL
832 PM CDT Sun Jun 20 2021
IAC061-097-210140-
/O.EXP.KDVN.TO.W.0003.000000T0000Z-210621T0130Z/
Jackson IA-Dubuque IA-
832 PM CDT Sun Jun 20 2021
...THE TORNADO WARNING FOR NORTHWESTERN JACKSON AND SOUTH CENTRAL
DUBUQUE COUNTIES HAS EXPIRED...
The Tornado Warning that was previously in effect has been reissued
for northern Jackson County and is in effect until 9 pm. Please
refer to that bulletin for the latest severe weather information.
A Severe Thunderstorm Watch remains in effect until 1100 PM CDT for
northeastern and east central Iowa.
To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
the Quad Cities.
Remember, a Tornado Warning still remains in effect for northern
Jackson County until 9 pm!
LAT...LON 4224 9063 4225 9089 4236 9085 4232 9058
TIME...MOT...LOC 0130Z 293DEG 31KT 4227 9061
$$
RP KinneyThe office that day
Everything else NWS Quad Cities, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 20, 7:08 PM CDT | Severe Thunderstorm Warning | DVN | Iowa, Keokuk | 38 min |
| Jun 20, 7:08 PM CDT | Severe Thunderstorm Warning | DVN | Delaware, Dubuque, Jones, Linn | 52 min |
| Jun 20, 7:37 PM CDT | Severe Thunderstorm Warning | DVN | Benton, Buchanan, Linn | 38 min |
| Jun 20, 8:04 PM CDT | Severe Thunderstorm Warning | DVN | Des Moines, Henry, Lee, Van Buren | 41 min |
| Jun 20, 8:18 PM CDT | Severe Thunderstorm Warning | DVN | Keokuk, Washington | 42 min |
| Jun 20, 8:19 PM CDT | Severe Thunderstorm Warning | DVN | Clinton, Jackson, Jones | 41 min |
| Jun 20, 8:27 PM CDT | Tornado Warning | DVN | Jackson | 33 min |
| Jun 20, 8:28 PM CDT | Tornado Warning | DVN | Keokuk, Washington | 32 min |
| Jun 20, 8:37 PM CDT | Tornado Warning | DVN | Des Moines, Lee | 39 min |
| Jun 20, 8:47 PM CDT | Special Weather Statement | DVN | Jones, Linn | 43 min |
| Jun 20, 8:53 PM CDT | Severe Thunderstorm Warning | DVN | Clinton, Jackson | 67 min |
| Jun 20, 8:59 PM CDT | Special Weather Statement | DVN | Louisa | 31 min |
| Jun 20, 9:29 PM CDT | Special Weather Statement | DVN | Lee | 46 min |
| Jun 20, 9:36 PM CDT | Special Weather Statement | DVN | Scott | 39 min |
Nearby
Tornado Warnings in Iowa, 2021Every tornado warning in 2021Tornadoes 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.