Alert archive / Iowa / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 8, NWS Quad Cities, IA

June 18, 2021Des Moines County, Henry County, Louisa County, Iowa

NWS Quad Cities, IA issued this severe thunderstorm warning at Jun 18, 2021, 11:29 PM CDT for Des Moines County, Henry County, Louisa County, Iowa. It was in force for 46 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 18, 2021, 11:29 PM CDT (04:29 UTC)
Expired: Jun 19, 2021, 12:15 AM CDT
In force: 46 min
Issued by: NWS Quad Cities, IA
Area: Storm-based polygon
Hail: 1.0 in
Wind: 50.0 mph

Counties Des Moines County, IA, Henry County, IA, Louisa County, IA

The radar

The Quad Cities radar (KDVN), 92 km from the middle of the area, began a volume at 04:32 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 18, 10:08 PM CDT	Severe Thunderstorm Watch	SPC	8 hr

The nearest sounding before it

Davenport, (KDVN), launched 00:00Z, 4.5 hours before the alert went out and 97 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: 4 J/kg
Mixed-layer CIN: -335 J/kg
Mixed-layer LCL: 2572 m above ground
0-6 km bulk shear: 55 kt
0-1 km storm-relative helicity: -15 m²/s²
0-3 km storm-relative helicity: 55 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

173 
WUUS53 KDVN 190429
SVRDVN
IAC057-087-115-190515-
/O.NEW.KDVN.SV.W.0008.210619T0429Z-210619T0515Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Quad Cities IA/IL
1129 PM CDT Fri Jun 18 2021

The National Weather Service in the Quad Cities has issued a

* Severe Thunderstorm Warning for...
  Northeastern Henry County in southeastern Iowa...
  Northwestern Des Moines County in southeastern Iowa...
  South central Louisa County in southeastern Iowa...

* Until 1215 AM CDT.

* At 1129 PM CDT, a severe thunderstorm was located near Mount Union,
  or 7 miles northeast of Mount Pleasant, moving east at 30 mph.

  HAZARD...Quarter size hail.

  SOURCE...Radar indicated.

  IMPACT...Damage to vehicles is expected.

* This severe thunderstorm will be near...
  Mount Union around 1135 PM CDT.

Other locations in the path of this severe thunderstorm include
Morning Sun and Mediapolis.

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 4098 9154 4115 9152 4112 9111 4097 9109
      4086 9118
TIME...MOT...LOC 0429Z 283DEG 25KT 4104 9146 

HAIL...1.00IN
WIND...<50MPH
 
$$

Gibbs

2 follow-up statements

002 
WWUS53 KDVN 190456
SVSDVN

Severe Weather Statement
National Weather Service Quad Cities IA/IL
1156 PM CDT Fri Jun 18 2021

IAC087-190506-
/O.CAN.KDVN.SV.W.0008.000000T0000Z-210619T0515Z/
Henry IA-
1156 PM CDT Fri Jun 18 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN 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 500 AM CDT for
southeastern Iowa.

LAT...LON 4092 9137 4114 9137 4112 9111 4097 9109
      4086 9118
TIME...MOT...LOC 0456Z 283DEG 25KT 4100 9122 

$$

IAC057-115-190515-
/O.CON.KDVN.SV.W.0008.000000T0000Z-210619T0515Z/
Des Moines IA-Louisa IA-
1156 PM CDT Fri Jun 18 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1215 AM CDT
FOR NORTHWESTERN DES MOINES AND SOUTH CENTRAL LOUISA COUNTIES...

At 1156 PM CDT, a severe thunderstorm was located over Mediapolis, or
12 miles south of Wapello, moving east at 30 mph.

HAZARD...Quarter size hail.

SOURCE...Radar indicated.

IMPACT...Damage to vehicles is expected.

Locations impacted include...
  Mediapolis.

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 4092 9137 4114 9137 4112 9111 4097 9109
      4086 9118
TIME...MOT...LOC 0456Z 283DEG 25KT 4100 9122 

HAIL...1.00IN
WIND...<50MPH
 
$$

Gibbs

256 
WWUS53 KDVN 190503
SVSDVN

Severe Weather Statement
National Weather Service Quad Cities IA/IL
1203 AM CDT Sat Jun 19 2021

IAC057-115-190515-
/O.CON.KDVN.SV.W.0008.000000T0000Z-210619T0515Z/
Des Moines IA-Louisa IA-
1203 AM CDT Sat Jun 19 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1215 AM CDT
FOR NORTH CENTRAL DES MOINES AND SOUTH CENTRAL LOUISA COUNTIES...

At 1203 AM CDT, a severe thunderstorm was located over Mediapolis, or
11 miles west of Oquawka, moving east at 30 mph.

HAZARD...Quarter size hail.

SOURCE...Radar indicated.

IMPACT...Damage to vehicles is expected.

Locations impacted include...
Mediapolis, Morning Sun, Kossuth, Dodgeville, Elrick Junction,
Northfield, Garland and Sperry.

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 4100 9131 4110 9127 4110 9111 4097 9109
      4092 9113
TIME...MOT...LOC 0503Z 283DEG 25KT 4099 9115 

HAIL...1.00IN
WIND...<50MPH
 
$$

Gibbs

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 18, 10:17 PM CDT	Severe Thunderstorm Warning	DVN	Des Moines, Henry, Louisa, Washington	58 min
Jun 18, 11:03 PM CDT	Severe Thunderstorm Warning	DVN	Des Moines	27 min
Jun 18, 11:21 PM CDT	Severe Thunderstorm Warning	DVN	Henry, Jefferson	39 min
Jun 18, 11:47 PM CDT	Severe Thunderstorm Warning	DVN	Louisa, Washington	29 min
Jun 19, 12:02 AM CDT	Severe Thunderstorm Warning	DVN	Keokuk, Washington	43 min
Jun 19, 12:12 AM CDT	Severe Thunderstorm Warning	DVN	Jefferson, Keokuk, Van Buren, Washington	48 min
Jun 19, 12:27 AM CDT	Severe Thunderstorm Warning	DVN	Des Moines, Louisa	27 min
Jun 19, 1:08 AM CDT	Severe Thunderstorm Warning	DVN	Lee, Van Buren	49 min
Jun 19, 1:28 AM CDT	Special Weather Statement	DVN	Louisa	2 hr
Jun 19, 2:01 AM CDT	Special Weather Statement	DVN	Lee, Van Buren	59 min
Jun 19, 4:33 AM CDT	Severe Thunderstorm Warning	DVN	Lee, Van Buren	57 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.