Alert archive / Iowa / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 35, NWS Quad Cities, IA

July 9, 2021Des Moines County, Henry County, Iowa; Henderson County, Illinois

NWS Quad Cities, IA issued this severe thunderstorm warning at Jul 9, 2021, 6:50 PM CDT for Des Moines County, Henry County, Iowa; Henderson County, Illinois. It was in force for 25 min. 5 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, 6:50 PM CDT (23:50 UTC)
Expired
Jul 9, 2021, 7:15 PM CDT
In force
25 min
Issued by
NWS Quad Cities, IA
Area
Storm-based polygon
Hail
1.75 in
Wind
50.0 mph

Counties Des Moines County, IA, Henry County, IA, Henderson County, IL

The radar

The Quad Cities radar (KDVN), 98 km from the middle of the area, began a volume at 23:53 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

TimeReportWhereRemark
Jul 9, 6:51 PM CDTHAIL 0.881 Ese New London, IANICKEL SIZED HAIL FOR ABOUT 2 MINUTES ENDING AROUND 653 PM.
Jul 9, 6:51 PM CDTHAIL 11 Se New London, IADIME TO QUARTER SIZED HAIL.
Jul 9, 7:19 PM CDTHAIL 11 E West Burlington, IA
Jul 9, 7:22 PM CDTHAIL 1.751 Wsw Burlington, IA
Jul 9, 7:24 PM CDTHAIL 1.51 Sse Burlington, 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, 11.8 hours before the alert went out and 103 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 12:00Z on 2021-07-09Temperature 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 12:00Z on 2021-07-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 53 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
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.

890 
WUUS53 KDVN 092350
SVRDVN
ILC071-IAC057-087-100015-
/O.NEW.KDVN.SV.W.0035.210709T2350Z-210710T0015Z/

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

The National Weather Service in the Quad Cities has issued a

* Severe Thunderstorm Warning for...
  Southern Henderson County in west central Illinois...
  Southeastern Henry County in southeastern Iowa...
  Des Moines County in southeastern Iowa...

* Until 715 PM CDT.

* At 650 PM CDT, a severe thunderstorm was located near New London,
  or 10 miles east of Mount Pleasant, moving southeast at 45 mph.

  HAZARD...Golf ball size hail.

  SOURCE...Radar indicated.

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

* This severe thunderstorm will be near...
  Danville around 655 PM CDT.
  Middletown around 700 PM CDT.
  West Burlington and Iowa Army Ammunition Plant around 705 PM CDT.
  Burlington around 710 PM CDT.

Other locations in the path of this severe thunderstorm include
Carman, Gladstone and Gulf Port.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4094 9158 4106 9135 4086 9080 4065 9098
TIME...MOT...LOC 2350Z 298DEG 38KT 4093 9135 

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

DC
2 follow-up statements
538 
WWUS53 KDVN 092355
SVSDVN

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

ILC071-IAC057-087-100015-
/O.CON.KDVN.SV.W.0035.000000T0000Z-210710T0015Z/
Henderson IL-Henry IA-Des Moines IA-
655 PM CDT Fri Jul 9 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 715 PM CDT
FOR SOUTHERN HENDERSON...SOUTHEASTERN HENRY AND DES MOINES
COUNTIES...

At 655 PM CDT, a severe thunderstorm was located near Danville, or 10
miles northwest of Burlington, moving southeast at 45 mph.

HAZARD...Two inch 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...
  West Burlington and Iowa Army Ammunition Plant around 705 PM CDT.
  Burlington around 710 PM CDT.

Other locations in the path of this severe thunderstorm include
Carman, Gladstone and Gulf Port.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4094 9158 4106 9135 4086 9080 4065 9098
TIME...MOT...LOC 2355Z 298DEG 38KT 4090 9129 

HAIL...2.00IN
WIND...60MPH
 
$$

DC
977 
WWUS53 KDVN 100001
SVSDVN

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

ILC071-IAC057-087-100015-
/O.CON.KDVN.SV.W.0035.000000T0000Z-210710T0015Z/
Henderson IL-Henry IA-Des Moines IA-
701 PM CDT Fri Jul 9 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 715 PM CDT
FOR SOUTHERN HENDERSON...SOUTHEASTERN HENRY AND DES MOINES
COUNTIES...

At 701 PM CDT, a severe thunderstorm was located near West
Burlington, or near Burlington, moving southeast at 45 mph.

HAZARD...Tennis 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...
  West Burlington around 705 PM CDT.
  Burlington and Gulf Port around 710 PM CDT.
  Carman around 715 PM CDT.

Other locations in the path of this severe thunderstorm include
Gladstone, Stronghurst, Biggsville and Terre Haute.

LAT...LON 4094 9158 4106 9135 4086 9080 4065 9098
TIME...MOT...LOC 0001Z 298DEG 38KT 4087 9121 

HAIL...2.50IN
WIND...60MPH
 
$$

DC

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 9, 2:49 AM CDTFlash Flood WatchDVNDes Moines, Henry, Jefferson, Lee, Van Buren40 hr
Jul 9, 5:04 PM CDTSpecial Weather StatementDVNIowa26 min
Jul 9, 5:16 PM CDTSevere Thunderstorm WarningDVNIowa, Johnson, Keokuk, Washington29 min
Jul 9, 5:34 PM CDTSpecial Weather StatementDVNBenton26 min
Jul 9, 5:59 PM CDTSpecial Weather StatementDVNBenton, Des Moines, Henry, Iowa, Jefferson, Johnson and 3 more31 min
Jul 9, 6:07 PM CDTSevere Thunderstorm WarningDVNHenry, Washington23 min
Jul 9, 6:23 PM CDTSevere Thunderstorm WarningDVNDes Moines, Henry, Louisa37 min
Jul 9, 6:37 PM CDTSpecial Weather StatementDVNIowa23 min
Jul 9, 8:58 AM CDTRiver Flood WatchDVNHancock, McDonough17 hr

Nearby

Severe Thunderstorm Warnings in Iowa, 2021Severe Thunderstorm Warnings in Illinois, 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.