Alert archive / Iowa / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 38, NWS Quad Cities, IA

July 9, 20215 counties in Iowa

NWS Quad Cities, IA issued this severe thunderstorm warning at Jul 9, 2021, 7:29 PM CDT for 5 counties in Iowa. It was in force for 31 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
Jul 9, 2021, 7:29 PM CDT (00:29 UTC)
Expired
Jul 9, 2021, 8:00 PM CDT
In force
31 min
Issued by
NWS Quad Cities, IA
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 mph

Counties Iowa County, IA, Johnson County, IA, Keokuk County, IA, Louisa County, IA, Washington County, IA

The radar

The Quad Cities radar (KDVN), 99 km from the middle of the area, began a volume at 00:34 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.

IssuedProductOfficeLasted
Jul 9, 7:08 PM CDTSevere Thunderstorm WatchSPC3 hr

The nearest sounding before it

Davenport, (KDVN), launched 00:00Z, 0.5 hours before the alert went out and 105 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-pSkew-T log-p diagram, Davenport, at 00:00Z on 2021-07-10Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Davenport, at 00:00Z on 2021-07-10The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 19 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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
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

Open this sounding in Storm Lab

The text

As transmitted.

998 
WUUS53 KDVN 100029
SVRDVN
IAC095-103-107-115-183-100100-
/O.NEW.KDVN.SV.W.0038.210710T0029Z-210710T0100Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Quad Cities IA/IL
729 PM CDT Fri Jul 9 2021

The National Weather Service in the Quad Cities has issued a

* Severe Thunderstorm Warning for...
  Northwestern Louisa County in southeastern Iowa...
  Northeastern Keokuk County in southeastern Iowa...
  Southwestern Johnson County in east central Iowa...
  Washington County in southeastern Iowa...
  Southeastern Iowa County in east central Iowa...

* Until 800 PM CDT.

* At 729 PM CDT, a severe thunderstorm was located near Kinross, or
  16 miles northwest of Washington, moving southeast at 45 mph.

  HAZARD...60 mph wind gusts and quarter 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...
  Kalona around 740 PM CDT.
  Richmond around 745 PM CDT.

Other locations in the path of this severe thunderstorm include
Washington, Ainsworth and Cotter.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 4161 9193 4136 9137 4134 9137 4117 9168
      4142 9214
TIME...MOT...LOC 0029Z 302DEG 39KT 4146 9192 

HAIL...1.00IN
WIND...60MPH
 
$$

DC
2 follow-up statements
955 
WWUS53 KDVN 100041
SVSDVN

Severe Weather Statement
National Weather Service Quad Cities IA/IL
741 PM CDT Fri Jul 9 2021

IAC095-100050-
/O.CAN.KDVN.SV.W.0038.000000T0000Z-210710T0100Z/
Iowa IA-
741 PM CDT Fri Jul 9 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN IOWA 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 and east central Iowa.

LAT...LON 4142 9209 4151 9190 4151 9183 4155 9183
      4156 9181 4136 9137 4134 9137 4117 9168
TIME...MOT...LOC 0040Z 302DEG 39KT 4139 9178 

$$

IAC103-107-115-183-100100-
/O.CON.KDVN.SV.W.0038.000000T0000Z-210710T0100Z/
Louisa IA-Keokuk IA-Johnson IA-Washington IA-
741 PM CDT Fri Jul 9 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 800 PM CDT
FOR NORTHWESTERN LOUISA...NORTHEASTERN KEOKUK...SOUTHWESTERN JOHNSON
AND WASHINGTON COUNTIES...

At 740 PM CDT, a severe thunderstorm was located near Richmond, or 7
miles northwest of Washington, moving southeast at 45 mph.

HAZARD...60 mph wind gusts and quarter size hail.

SOURCE...Radar indicated.

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

Locations impacted include...
  Washington, Ainsworth and Cotter.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
sturdy building.

&&

LAT...LON 4142 9209 4151 9190 4151 9183 4155 9183
      4156 9181 4136 9137 4134 9137 4117 9168
TIME...MOT...LOC 0040Z 302DEG 39KT 4139 9178 

HAIL...1.00IN
WIND...60MPH
 
$$

DC
914 
WWUS53 KDVN 100047 RRA
SVSDVN

Severe Weather Statement
National Weather Service Quad Cities IA/IL
747 PM CDT Fri Jul 9 2021

IAC103-107-100057-
/O.CAN.KDVN.SV.W.0038.000000T0000Z-210710T0100Z/
Keokuk IA-Johnson IA-
747 PM CDT Fri Jul 9 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN KEOKUK AND
SOUTHWESTERN JOHNSON COUNTIES 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.

LAT...LON 4144 9175 4146 9168 4148 9164 4136 9137
      4134 9137 4117 9168 4133 9195
TIME...MOT...LOC 0047Z 302DEG 39KT 4135 9169 

$$

IAC115-183-100100-
/O.CON.KDVN.SV.W.0038.000000T0000Z-210710T0100Z/
Louisa IA-Washington IA-
747 PM CDT Fri Jul 9 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 800 PM CDT
FOR NORTHWESTERN LOUISA AND CENTRAL WASHINGTON COUNTIES...

At 747 PM CDT, a severe thunderstorm was located near Washington,
moving southeast at 45 mph.

HAZARD...60 mph wind gusts and quarter size hail.

SOURCE...Radar indicated.

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

Locations impacted include...
Washington, Ainsworth, Cotter, Richmond, West Chester, Haskins,
Washington Airport, Washington County Fairgrounds, Marr Park and
Gladwin.

LAT...LON 4144 9175 4146 9168 4148 9164 4136 9137
      4134 9137 4117 9168 4133 9195
TIME...MOT...LOC 0047Z 302DEG 39KT 4135 9169 

HAIL...1.00IN
WIND...60MPH
 
$$

DC

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 9, 7:08 PM CDTSevere Thunderstorm WarningDVNDes Moines, Henry, Lee37 min
Jul 9, 7:19 PM CDTSevere Thunderstorm WarningDVNLee41 min
Jul 9, 7:51 PM CDTSevere Thunderstorm WarningDVNHenry, Jefferson, Keokuk, Washington24 min
Jul 9, 8:25 PM CDTSevere Thunderstorm WarningDVNHenry, Lee, Van Buren35 min
Jul 9, 8:57 PM CDTSevere Thunderstorm WarningDVNLee33 min
Jul 10, 4:25 AM CDTSpecial Weather StatementDVNJefferson, Keokuk, Van Buren95 min

Nearby

Severe Thunderstorm Warnings in Iowa, 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.