Alert archive / Iowa / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 47, NWS Quad Cities, IA

July 14, 2021Benton County, Buchanan County, Iowa

NWS Quad Cities, IA issued this severe thunderstorm warning at Jul 14, 2021, 6:32 PM CDT for Benton County, Buchanan County, Iowa. It was in force for 43 min. 2 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 14, 2021, 6:32 PM CDT (23:32 UTC)
Expired: Jul 14, 2021, 7:15 PM CDT
In force: 43 min
Issued by: NWS Quad Cities, IA
Area: Storm-based polygon
Tornado: Possible
Hail: 0.75 in
Wind: 60.0 mph

Counties Benton County, IA, Buchanan County, IA

The radar

The Des Moines radar (KDMX), 148 km from the middle of the area, began a volume at 23:36 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 14, 7:14 PM CDT	TORNADO	8 W Garrison, IA	DELAYED REPORT. RECEIVED VIDEO OF A TORNADO CROSSING INTO BENTON COUNTY. SAME TORNADO THAT HIT DYSART.
Jul 14, 7:20 PM CDT	TORNADO	1 N Garrison, IA	BENTON COUNTY EMA RELAYED PUBLIC REPORT OF A BRIEF TORNADO TOUCHDOWN ALONG 18TH AVENUE 1 MILE NORTH OF GARRISON.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Jul 14, 2:35 PM CDT	Tornado Watch	SPC	8 hr

The nearest sounding before it

Davenport, (KDVN), launched 12:00Z, 11.5 hours before the alert went out and 155 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: 573 J/kg
Mixed-layer CIN: -62 J/kg
Mixed-layer LCL: 1106 m above ground
0-6 km bulk shear: 34 kt
0-1 km storm-relative helicity: 108 m²/s²
0-3 km storm-relative helicity: 139 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.1

Open this sounding in Storm Lab

The text

As transmitted.

692 
WUUS53 KDVN 142332
SVRDVN
IAC011-019-150015-
/O.NEW.KDVN.SV.W.0047.210714T2332Z-210715T0015Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Quad Cities IA/IL
632 PM CDT Wed Jul 14 2021

The National Weather Service in the Quad Cities has issued a

* Severe Thunderstorm Warning for...
  Southwestern Buchanan County in northeastern Iowa...
  Northwestern Benton County in east central Iowa...

* Until 715 PM CDT.

* At 632 PM CDT, severe thunderstorms were located along a line
  extending from near Jesup to near Traer, moving east at 35 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

  IMPACT...Expect damage to roofs, siding, and trees.

* Severe thunderstorms will be near...
  Jesup around 635 PM CDT.
  Independence around 650 PM CDT.

Other locations in the path of these severe thunderstorms include
Garrison and Vinton.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 900 PM CDT for northeastern
and east central Iowa.

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

&&

LAT...LON 4230 9230 4230 9206 4247 9206 4247 9208
      4252 9208 4250 9186 4205 9201 4206 9230
TIME...MOT...LOC 2332Z 271DEG 32KT 4253 9209 4214 9246 

TORNADO...POSSIBLE
HAIL...<.75IN
WIND...60MPH
 
$$

Uttech

2 follow-up statements

484 
WWUS53 KDVN 142347
SVSDVN

Severe Weather Statement
National Weather Service Quad Cities IA/IL
647 PM CDT Wed Jul 14 2021

IAC011-019-150015-
/O.CON.KDVN.SV.W.0047.000000T0000Z-210715T0015Z/
Buchanan IA-Benton IA-
647 PM CDT Wed Jul 14 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 715 PM CDT
FOR SOUTHWESTERN BUCHANAN AND NORTHWESTERN BENTON COUNTIES...

At 647 PM CDT, severe thunderstorms were located along a line
extending from near Jesup to near Dysart, moving east at 40 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...Expect damage to roofs, siding, and trees.

These severe storms will be near...
  Jesup around 650 PM CDT.

Other locations in the path of these severe thunderstorms include
Independence, Vinton and Mount Auburn.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 900 PM CDT for northeastern
and east central Iowa.

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

&&

LAT...LON 4230 9230 4230 9206 4247 9206 4247 9208
      4252 9208 4250 9186 4205 9201 4206 9230
TIME...MOT...LOC 2347Z 266DEG 34KT 4248 9203 4214 9230 

TORNADO...POSSIBLE
HAIL...<.75IN
WIND...60MPH
 
$$

Uttech

524 
WWUS53 KDVN 150003
SVSDVN

Severe Weather Statement
National Weather Service Quad Cities IA/IL
703 PM CDT Wed Jul 14 2021

IAC011-019-150015-
/O.CON.KDVN.SV.W.0047.000000T0000Z-210715T0015Z/
Buchanan IA-Benton IA-
703 PM CDT Wed Jul 14 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 715 PM CDT
FOR SOUTHWESTERN BUCHANAN AND NORTHWESTERN BENTON COUNTIES...

At 703 PM CDT, severe thunderstorms were located along a line
extending from Independence to Garrison, moving east at 35 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...
  Independence.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 900 PM CDT for northeastern
and east central Iowa.

&&

LAT...LON 4230 9230 4230 9206 4247 9206 4247 9208
      4252 9208 4250 9186 4205 9201 4206 9230
TIME...MOT...LOC 0003Z 271DEG 32KT 4248 9185 4214 9213 

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

DC

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 14, 5:38 AM CDT	Special Weather Statement	DVN	Buchanan	37 min
Jul 14, 9:32 AM CDT	Special Weather Statement	DVN	Keokuk	28 min
Jul 14, 10:02 AM CDT	Special Weather Statement	DVN	Benton, Iowa, Jefferson, Keokuk, Washington	28 min
Jul 14, 10:28 AM CDT	Special Weather Statement	DVN	Benton, Buchanan, Henry, Iowa, Jefferson, Johnson and 1 more	32 min
Jul 14, 10:58 AM CDT	Special Weather Statement	DVN	Delaware, Johnson, Linn, Louisa, Washington	32 min
Jul 14, 11:31 AM CDT	Special Weather Statement	DVN	Cedar, Clinton, Dubuque, Jackson, Jones, Scott	29 min
Jul 14, 11:40 AM CDT	Severe Thunderstorm Warning	DVN	Delaware, Dubuque, Jackson	35 min
Jul 14, 12:15 PM CDT	Special Weather Statement	DVN	Clinton, Dubuque, Jackson	30 min
Jul 14, 12:35 PM CDT	Severe Thunderstorm Warning	DVN	Dubuque, Jackson	40 min
Jul 14, 1:07 PM CDT	Special Weather Statement	DVN	Scott	38 min
Jul 14, 6:04 PM CDT	Severe Thunderstorm Warning	DVN	Buchanan	41 min
Jul 14, 6:25 PM CDT	Tornado Warning	DVN	Buchanan	50 min
Jul 14, 6:56 PM CDT	Severe Thunderstorm Warning	DVN	Buchanan, Delaware	49 min
Jul 14, 6:58 PM CDT	Tornado Warning	DVN	Benton	47 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.