Alert archive / Iowa / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 25, NWS Quad Cities, IA

June 22, 2021Jefferson County, Keokuk County, Iowa

NWS Quad Cities, IA issued this severe thunderstorm warning at Jun 22, 2021, 6:57 PM CDT for Jefferson County, Keokuk County, Iowa. It was in force for 33 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 22, 2021, 6:57 PM CDT (23:57 UTC)
Expired: Jun 22, 2021, 7:30 PM CDT
In force: 33 min
Issued by: NWS Quad Cities, IA
Area: Storm-based polygon
Hail: 1.25 in
Wind: 60.0 mph

Counties Jefferson County, IA, Keokuk County, IA

The radar

The Quad Cities radar (KDVN), 141 km from the middle of the area, began a volume at 23:57 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 22, 7:05 PM CDT	HAIL 0.88	1 N Brookville, IA	ALSO ESTIMATED 40-50 MPH WINDS. LASTED 5 MINUTES.
Jun 22, 7:13 PM CDT	HAIL 0.75	Libertyville, IA	HAIL COVERING THE GROUND.
Jun 22, 7:16 PM CDT	HAIL 1	Libertyville, IA	PEA TO QUARTER SIZED HAIL; LASTED FOR 10 TO 15 MINUTES.

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, 12.0 hours before the alert went out and 147 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 2027 m above ground
0-6 km bulk shear: 54 kt
0-1 km storm-relative helicity: 31 m²/s²
0-3 km storm-relative helicity: -11 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

401 
WUUS53 KDVN 222357
SVRDVN
IAC101-107-230045-
/O.NEW.KDVN.SV.W.0025.210622T2357Z-210623T0045Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Quad Cities IA/IL
657 PM CDT Tue Jun 22 2021

The National Weather Service in the Quad Cities has issued a

* Severe Thunderstorm Warning for...
  South central Keokuk County in southeastern Iowa...
  Western Jefferson County in southeastern Iowa...

* Until 745 PM CDT.

* At 657 PM CDT, a severe thunderstorm was located over Abingdon, or
  11 miles northwest of Fairfield, moving south at 40 mph.

  HAZARD...60 mph wind gusts and half dollar size hail.

  SOURCE...Radar indicated.

  IMPACT...Hail damage to vehicles is expected. Expect wind damage 
           to roofs, siding, and trees.

* This severe thunderstorm will be near...
  Maharishi Vedic City around 705 PM CDT.
  Batavia around 710 PM CDT.
  Libertyville around 715 PM CDT.

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.

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

&&

LAT...LON 4123 9206 4090 9193 4090 9218 4116 9218
      4116 9225 4117 9225
TIME...MOT...LOC 2357Z 341DEG 33KT 4111 9215 

HAIL...1.25IN
WIND...60MPH
 
$$

McClure

4 follow-up statements

152 
WWUS53 KDVN 230003
SVSDVN

Severe Weather Statement
National Weather Service Quad Cities IA/IL
703 PM CDT Tue Jun 22 2021

IAC101-107-230045-
/O.CON.KDVN.SV.W.0025.000000T0000Z-210623T0045Z/
Keokuk IA-Jefferson IA-
703 PM CDT Tue Jun 22 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 745 PM CDT
FOR SOUTH CENTRAL KEOKUK AND WESTERN JEFFERSON COUNTIES...

At 703 PM CDT, a severe thunderstorm was located over Abingdon, or 8
miles west of Fairfield, moving south 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 storm will be near...
  Libertyville around 715 PM CDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Prepare immediately for large hail and damaging winds. People outside
should move to a shelter, inside a strong building and away from
windows.

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

&&

LAT...LON 4120 9205 4090 9193 4090 9218 4116 9218
TIME...MOT...LOC 0003Z 341DEG 33KT 4105 9212 

HAIL...1.50IN
WIND...60MPH
 
$$

McClure

069 
WWUS53 KDVN 230011
SVSDVN

Severe Weather Statement
National Weather Service Quad Cities IA/IL
711 PM CDT Tue Jun 22 2021

IAC107-230021-
/O.CAN.KDVN.SV.W.0025.000000T0000Z-210623T0045Z/
Keokuk IA-
711 PM CDT Tue Jun 22 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTH CENTRAL KEOKUK COUNTY IS
CANCELLED...
    
The severe thunderstorm which prompted the warning has moved out of 
the warned area. Therefore, the warning has been cancelled.

LAT...LON 4090 9193 4090 9218 4106 9218 4115 9203
TIME...MOT...LOC 0011Z 341DEG 33KT 4099 9209 

$$

IAC101-230045-
/O.CON.KDVN.SV.W.0025.000000T0000Z-210623T0045Z/
Jefferson IA-
711 PM CDT Tue Jun 22 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 745 PM CDT
FOR WESTERN JEFFERSON COUNTY...

At 711 PM CDT, a severe thunderstorm was located near Libertyville,
or near Fairfield, moving south 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 storm will be near...
  Libertyville around 715 PM CDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Prepare immediately for large hail and damaging winds. People outside
should move to a shelter, inside a strong building and away from
windows.

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

&&

LAT...LON 4090 9193 4090 9218 4106 9218 4115 9203
TIME...MOT...LOC 0011Z 341DEG 33KT 4099 9209 

HAIL...1.50IN
WIND...60MPH
 
$$

McClure

590 
WWUS53 KDVN 230017
SVSDVN

Severe Weather Statement
National Weather Service Quad Cities IA/IL
717 PM CDT Tue Jun 22 2021

IAC101-230045-
/O.CON.KDVN.SV.W.0025.000000T0000Z-210623T0045Z/
Jefferson IA-
717 PM CDT Tue Jun 22 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 745 PM CDT
FOR SOUTHWESTERN JEFFERSON COUNTY...

At 717 PM CDT, a severe thunderstorm was located over Libertyville,
or 7 miles southwest of Fairfield, moving south 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.

Locations impacted include...
Fairfield, Batavia, Libertyville, Maharishi Vedic City, Jefferson
County Park, Collett and Jefferson County Fairgrounds.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Prepare immediately for large hail and damaging winds. People outside
should move to a shelter, inside a strong building and away from
windows.

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

&&

LAT...LON 4090 9193 4090 9218 4098 9218 4107 9200
TIME...MOT...LOC 0017Z 341DEG 33KT 4093 9206 

HAIL...1.50IN
WIND...60MPH
 
$$

McClure

520 
WWUS53 KDVN 230030
SVSDVN

Severe Weather Statement
National Weather Service Quad Cities IA/IL
730 PM CDT Tue Jun 22 2021

IAC101-230039-
/O.CAN.KDVN.SV.W.0025.000000T0000Z-210623T0045Z/
Jefferson IA-
730 PM CDT Tue Jun 22 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN JEFFERSON COUNTY
IS CANCELLED...
        
The storm which prompted the warning has moved out of the area.
Therefore, the warning has been cancelled.

LAT...LON 4090 9193 4090 9218 4098 9218 4107 9200
TIME...MOT...LOC 0029Z 341DEG 33KT 4082 9201 

$$

McClure

The office that day

Everything else NWS Quad Cities, IA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 22, 5:11 PM CDT	Special Weather Statement	DVN	Benton	34 min
Jun 22, 5:27 PM CDT	Severe Thunderstorm Warning	DVN	Benton, Buchanan, Delaware, Linn	48 min
Jun 22, 5:44 PM CDT	Special Weather Statement	DVN	Buchanan	31 min
Jun 22, 6:16 PM CDT	Special Weather Statement	DVN	Jones	29 min
Jun 22, 6:50 PM CDT	Special Weather Statement	DVN	Jefferson	25 min

Nearby

Severe Thunderstorm Warnings in Iowa, 2021 Every 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.