Alert archive / Iowa / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 33, NWS Quad Cities, IA

July 9, 2021Henry County, Washington County, Iowa

NWS Quad Cities, IA issued this severe thunderstorm warning at Jul 9, 2021, 6:07 PM CDT for Henry County, Washington County, Iowa. It was in force for 23 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: Jul 9, 2021, 6:07 PM CDT (23:07 UTC)
Expired: Jul 9, 2021, 6:30 PM CDT
In force: 23 min
Issued by: NWS Quad Cities, IA
Area: Storm-based polygon
Hail: 1.0 in
Wind: 50.0 mph

Counties Henry County, IA, Washington County, IA

The radar

The Quad Cities radar (KDVN), 103 km from the middle of the area, began a volume at 23:06 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
Jul 9, 6:13 PM CDT	HAIL 1.75	Swedesburg, IA	GOLF BALL HAIL ON 218 NEAR SWEDESBURG. HEAVY RAIN WITH NEAR ZERO VISIBILITY.
Jul 9, 6:30 PM CDT	HAIL 0.7	4 Wsw Mount Union, IA	A FEW DIME SIZED HAIL STONES AND HEAVY RAIN. TIME ESTIMATED.
Jul 9, 6:31 PM CDT	HAIL 1.5	Mount Union, IA

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, 11.1 hours before the alert went out and 109 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: 1131 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 53 m²/s²
0-3 km storm-relative helicity: 100 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

391 
WUUS53 KDVN 092307
SVRDVN
IAC087-183-092330-
/O.NEW.KDVN.SV.W.0033.210709T2307Z-210709T2330Z/

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

The National Weather Service in the Quad Cities has issued a

* Severe Thunderstorm Warning for...
  Central Henry County in southeastern Iowa...
  Southern Washington County in southeastern Iowa...

* Until 630 PM CDT.

* At 607 PM CDT, a severe thunderstorm was located near Olds, or 8
  miles north of Mount Pleasant, moving southeast at 45 mph.

  HAZARD...Quarter size hail.

  SOURCE...Radar indicated.

  IMPACT...Damage to vehicles is expected.

* This severe thunderstorm will be near...
  Mount Pleasant and Winfield around 615 PM CDT.
  Mount Union around 620 PM CDT.
  New London around 625 PM CDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4105 9171 4120 9158 4109 9138 4083 9141
TIME...MOT...LOC 2307Z 302DEG 39KT 4108 9156 

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

DC

2 follow-up statements

403 
WWUS53 KDVN 092313
SVSDVN

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

IAC183-092322-
/O.CAN.KDVN.SV.W.0033.000000T0000Z-210709T2330Z/
Washington IA-
613 PM CDT Fri Jul 9 2021

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

LAT...LON 4107 9167 4116 9157 4109 9138 4086 9141
TIME...MOT...LOC 2312Z 302DEG 39KT 4105 9149 

$$

IAC087-092330-
/O.CON.KDVN.SV.W.0033.000000T0000Z-210709T2330Z/
Henry IA-
613 PM CDT Fri Jul 9 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 630 PM CDT
FOR CENTRAL HENRY COUNTY...

At 612 PM CDT, a severe thunderstorm was located near Mount Union, or
near Mount Pleasant, moving southeast at 45 mph.

HAZARD...Half dollar size hail.

SOURCE...Radar indicated.

IMPACT...Damage to vehicles is expected.

This severe storm will be near...
  Mount Union around 620 PM CDT.
  New London around 625 PM CDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4107 9167 4116 9157 4109 9138 4086 9141
TIME...MOT...LOC 2312Z 302DEG 39KT 4105 9149 

HAIL...1.25IN
WIND...<50MPH
 
$$

DC

933 
WWUS53 KDVN 092316
SVSDVN

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

IAC087-092330-
/O.CON.KDVN.SV.W.0033.000000T0000Z-210709T2330Z/
Henry IA-
616 PM CDT Fri Jul 9 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 630 PM CDT
FOR CENTRAL HENRY COUNTY...

At 615 PM CDT, a severe thunderstorm was located near Mount Union, 
or 7 miles northeast of Mount Pleasant, moving southeast at 45 mph. 
A trained spotter reported golf ball size hail on Highway 218 at 
Swedesburg. 

HAZARD...Golf ball size hail.

SOURCE...Trained weather spotters.

IMPACT...People and animals outdoors will be injured. Expect damage 
         to roofs, siding, windows, and vehicles.

This severe storm will be near...
  New London around 625 PM CDT.

LAT...LON 4107 9167 4116 9157 4109 9138 4086 9141
TIME...MOT...LOC 2315Z 302DEG 39KT 4103 9144 

HAIL...1.75IN
WIND...<50MPH
 
$$

DC

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 9, 2:49 AM CDT	Flash Flood Watch	DVN	Des Moines, Henry, Jefferson, Lee, Van Buren	40 hr
Jul 9, 5:04 PM CDT	Special Weather Statement	DVN	Iowa	26 min
Jul 9, 5:16 PM CDT	Severe Thunderstorm Warning	DVN	Iowa, Johnson, Keokuk, Washington	29 min
Jul 9, 5:34 PM CDT	Special Weather Statement	DVN	Benton	26 min
Jul 9, 5:59 PM CDT	Special Weather Statement	DVN	Benton, Des Moines, Henry, Iowa, Jefferson, Johnson and 3 more	31 min
Jul 9, 6:23 PM CDT	Severe Thunderstorm Warning	DVN	Des Moines, Henry, Louisa	37 min
Jul 9, 6:37 PM CDT	Special Weather Statement	DVN	Iowa	23 min
Jul 9, 6:50 PM CDT	Severe Thunderstorm Warning	DVN	Des Moines, Henry	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.