Alert archive / Iowa / Tornado Warnings in 2021

Tornado Warning 4, NWS Quad Cities, IA

June 20, 2021Jackson County, Iowa

NWS Quad Cities, IA issued this tornado warning at Jun 20, 2021, 8:27 PM CDT for Jackson County, Iowa. It was in force for 33 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: Jun 20, 2021, 8:27 PM CDT (01:27 UTC)
Expired: Jun 20, 2021, 9:00 PM CDT
In force: 33 min
Issued by: NWS Quad Cities, IA
Area: Storm-based polygon
Tornado: Observed
Hail: 0.75 in

County Jackson County, IA

The radar

The Quad Cities radar (KDVN), 77 km from the middle of the area, began a volume at 01:27 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
Jun 20, 4:01 PM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Davenport, (KDVN), launched 00:00Z, 1.5 hours before the alert went out and 75 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

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

Open this sounding in Storm Lab

The text

As transmitted.

043 
WFUS53 KDVN 210127
TORDVN
IAC097-210200-
/O.NEW.KDVN.TO.W.0004.210621T0127Z-210621T0200Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Quad Cities IA/IL
827 PM CDT Sun Jun 20 2021

The National Weather Service in the Quad Cities has issued a

* Tornado Warning for...
  North central Jackson County in east central Iowa...

* Until 900 PM CDT.

* At 827 PM CDT, a confirmed tornado was located over La Motte, or 12
  miles southwest of Galena, 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.

* The tornado will be near...
  Bellevue around 845 PM CDT.

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.

Heavy rainfall may hide this tornado. 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 9042 4230 9042 4229 9043 4228 9043
      4225 9042 4224 9041 4225 9067 4235 9066
      4235 9044
TIME...MOT...LOC 0127Z 270DEG 30KT 4229 9060 

TORNADO...OBSERVED
HAIL...<.75IN

$$

RP Kinney

2 follow-up statements

655 
WWUS53 KDVN 210138
SVSDVN

Severe Weather Statement
National Weather Service Quad Cities IA/IL
838 PM CDT Sun Jun 20 2021

IAC097-210200-
/O.CON.KDVN.TO.W.0004.000000T0000Z-210621T0200Z/
Jackson IA-
838 PM CDT Sun Jun 20 2021

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 900 PM CDT FOR NORTH
CENTRAL JACKSON COUNTY...
    
At 838 PM CDT, a severe thunderstorm capable of producing a tornado
was located near Bellevue, or 9 miles south of Galena, moving east 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 tornadic thunderstorm will remain over mainly rural areas of
north central Jackson County, including the following locations...
Spruce Creek Park, Smiths and Bellevue State Park.

At 810 pm, Emergency management reported a tornado caused structure 
and power line damage near McDevitt Lane along the Dubuque and 
Jackson County border. There have been no recent reports of 
tornadoes.

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.

Heavy rainfall may hide this tornado. 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 9042 4230 9042 4229 9043 4228 9043
      4225 9042 4224 9041 4225 9060 4235 9057
      4235 9044
TIME...MOT...LOC 0138Z 270DEG 30KT 4229 9048 

TORNADO...RADAR INDICATED
HAIL...<.75IN

$$

RP Kinney

600 
WWUS53 KDVN 210153 RRA
SVSDVN

Severe Weather Statement
National Weather Service Quad Cities IA/IL
853 PM CDT Sun Jun 20 2021

IAC097-210203-
/O.EXP.KDVN.TO.W.0004.000000T0000Z-210621T0200Z/
Jackson IA-
853 PM CDT Sun Jun 20 2021

...THE TORNADO WARNING FOR NORTH CENTRAL JACKSON COUNTY 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 1100 PM CDT for
east central Iowa. A Severe Thunderstorm Watch also remains in effect
until 100 AM CDT for northwestern Illinois.

To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
the Quad Cities.

LAT...LON 4233 9042 4230 9042 4229 9043 4228 9043
      4225 9042 4224 9041 4225 9060 4235 9057
      4235 9044
TIME...MOT...LOC 0153Z 270DEG 30KT 4229 9033 

$$

RP Kinney

The 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, 7:48 PM CDT	Tornado Warning	DVN	Dubuque, Jackson, Jones	42 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, 8:28 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, 2021 Every tornado warning in 2021 Tornadoes 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.