Alert archive / Iowa / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 71, NWS Quad Cities, IA

August 10, 20214 counties in Iowa

NWS Quad Cities, IA issued this severe thunderstorm warning at Aug 10, 2021, 4:38 PM CDT for 4 counties in Iowa. It was in force for 52 min. 6 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: Aug 10, 2021, 4:38 PM CDT (21:38 UTC)
Expired: Aug 10, 2021, 5:30 PM CDT
In force: 52 min
Issued by: NWS Quad Cities, IA
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Cedar County, IA, Jackson County, IA, Jones County, IA, Linn County, IA

The radar

The Quad Cities radar (KDVN), 88 km from the middle of the area, began a volume at 21:38 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
Aug 10, 4:45 PM CDT	TSTM WND GST 49	1 Ssw Fairview, IA	IADOT RWIS.
Aug 10, 4:45 PM CDT	TSTM WND GST 60	3 Ene Marion, IA	ESTIMATED WIND GUST. HEAVY RAIN ALSO AT TIME OF WIND REPORT.
Aug 10, 4:46 PM CDT	HAIL 0.25	2 Wnw Marion, IA
Aug 10, 4:47 PM CDT	TSTM WND DMG	2 W Whittier, IA	TIME ESTIMATED FROM RADAR. MULTIPLE TREE LIMBS DOWN WITH CORN FLATTENED.
Aug 10, 4:47 PM CDT	TSTM WND GST 60	2 E Marion, IA	ESTIMATED 50 TO 60 MPH WINDS.
Aug 10, 4:51 PM CDT	TSTM WND DMG	Morley, IA	PART OF A TREE BLOWN DOWN ALONG A HOUSE, PICTURES ON SOCIAL MEDIA. TIME ESTIMATED USING RADAR.

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
Aug 10, 2:08 PM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Davenport, (KDVN), launched 12:00Z, 9.6 hours before the alert went out and 94 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: 3755 J/kg
Mixed-layer CIN: -67 J/kg
Mixed-layer LCL: 819 m above ground
0-6 km bulk shear: 12 kt
0-1 km storm-relative helicity: -37 m²/s²
0-3 km storm-relative helicity: 4 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

465 
WUUS53 KDVN 102138
SVRDVN
IAC031-097-105-113-102230-
/O.NEW.KDVN.SV.W.0071.210810T2138Z-210810T2230Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Quad Cities IA/IL
438 PM CDT Tue Aug 10 2021

The National Weather Service in the Quad Cities has issued a

* Severe Thunderstorm Warning for...
  Western Jackson County in east central Iowa...
  Northwestern Cedar County in east central Iowa...
  Southern Jones County in east central Iowa...
  Southern Linn County in east central Iowa...

* Until 530 PM CDT.

* At 438 PM CDT, severe thunderstorms were located along a line
  extending from near Waubeek to near Cedar Rapids, moving east at 35
  mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Trained weather spotters.

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

* Severe thunderstorms will be near...
  Springville, Stone City and Viola around 445 PM CDT.
  Anamosa around 450 PM CDT.

Other locations in the path of these severe thunderstorms include
Mount Vernon, Lisbon, Martelle, Center Junction, Onslow,
Mechanicsville, Wyoming, Morley, Olin, Stanwood and Monmouth.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4214 9172 4215 9077 4184 9113 4189 9183
      4194 9183
TIME...MOT...LOC 2138Z 275DEG 32KT 4214 9141 4193 9169 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Uttech

3 follow-up statements

183 
WWUS53 KDVN 102150
SVSDVN

Severe Weather Statement
National Weather Service Quad Cities IA/IL
450 PM CDT Tue Aug 10 2021

IAC031-097-105-113-102230-
/O.CON.KDVN.SV.W.0071.000000T0000Z-210810T2230Z/
Jackson IA-Cedar IA-Jones IA-Linn IA-
450 PM CDT Tue Aug 10 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 530 PM CDT
FOR WESTERN JACKSON...NORTHWESTERN CEDAR...SOUTHERN JONES AND
SOUTHEASTERN LINN COUNTIES...

At 450 PM CDT, severe thunderstorms were located along a line
extending from Anamosa to near Bertram, moving east at 40 mph.

HAZARD...70 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...Expect considerable tree damage. Damage is likely to mobile 
         homes, roofs, and outbuildings.

These severe storms will be near...
  Anamosa around 455 PM CDT.

Other locations in the path of these severe thunderstorms include
Center Junction, Wyoming, Onslow, Mechanicsville, Morley, Stanwood,
Olin, Monmouth and Oxford Junction.

LAT...LON 4215 9077 4184 9113 4188 9166 4204 9165
      4214 9156
TIME...MOT...LOC 2150Z 276DEG 35KT 4213 9128 4192 9156 

THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...70 MPH

$$

Uttech

306 
WWUS53 KDVN 102202
SVSDVN

Severe Weather Statement
National Weather Service Quad Cities IA/IL
502 PM CDT Tue Aug 10 2021

IAC031-097-105-113-102230-
/O.CON.KDVN.SV.W.0071.000000T0000Z-210810T2230Z/
Jackson IA-Cedar IA-Jones IA-Linn IA-
502 PM CDT Tue Aug 10 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 530 PM CDT
FOR WESTERN JACKSON...NORTHWESTERN CEDAR...SOUTHERN JONES AND
SOUTHEASTERN LINN COUNTIES...

At 502 PM CDT, severe thunderstorms were located along a line
extending from Center Junction to near Mount Vernon, moving east at
40 mph.

HAZARD...70 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...Expect considerable tree damage. Damage is likely to mobile 
         homes, roofs, and outbuildings.

These severe storms will be near...
  Wyoming, Onslow and Center Junction around 505 PM CDT.

Other locations in the path of these severe thunderstorms include
Monmouth, Mechanicsville, Morley, Stanwood, Olin and Oxford Junction.

LAT...LON 4215 9077 4184 9113 4187 9159 4203 9154
      4214 9148
TIME...MOT...LOC 2202Z 274DEG 36KT 4212 9106 4192 9148 

THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...70 MPH

$$

Uttech

197 
WWUS53 KDVN 102218
SVSDVN

Severe Weather Statement
National Weather Service Quad Cities IA/IL
518 PM CDT Tue Aug 10 2021

IAC113-102228-
/O.CAN.KDVN.SV.W.0071.000000T0000Z-210810T2230Z/
Linn IA-
518 PM CDT Tue Aug 10 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN LINN COUNTY IS
CANCELLED...

The storms which prompted the warning have moved out of the warned 
area. Therefore, the warning has been cancelled.

A Severe Thunderstorm Watch remains in effect until 800 PM CDT for
east central Iowa.

LAT...LON 4215 9077 4184 9113 4186 9137 4214 9134
TIME...MOT...LOC 2218Z 279DEG 35KT 4210 9085 4186 9130 

$$

IAC031-097-105-102230-
/O.CON.KDVN.SV.W.0071.000000T0000Z-210810T2230Z/
Jackson IA-Cedar IA-Jones IA-
518 PM CDT Tue Aug 10 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 530 PM CDT
FOR WESTERN JACKSON...NORTHWESTERN CEDAR AND SOUTHERN JONES
COUNTIES...

At 518 PM CDT, severe thunderstorms were located along a line
extending from near Monmouth to near Mechanicsville, moving east at
40 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

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

Locations impacted include...
  Monmouth.

LAT...LON 4215 9077 4184 9113 4186 9137 4214 9134
TIME...MOT...LOC 2218Z 279DEG 35KT 4210 9085 4186 9130 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Uttech

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 10, 2:28 PM CDT	Heat Advisory	DVN	Benton, Buchanan, Cedar, Clinton, Delaware, Des Moines and 15 more	29 hr
Aug 10, 2:33 PM CDT	Special Weather Statement	DVN	Buchanan	27 min
Aug 10, 2:42 PM CDT	Special Weather Statement	DVN	Benton	33 min
Aug 10, 2:55 PM CDT	Severe Thunderstorm Warning	DVN	Buchanan	50 min
Aug 10, 3:07 PM CDT	Severe Thunderstorm Warning	DVN	Delaware, Dubuque	23 min
Aug 10, 3:25 PM CDT	Severe Thunderstorm Warning	DVN	Buchanan, Delaware, Linn	50 min
Aug 10, 3:29 PM CDT	Severe Thunderstorm Warning	DVN	Delaware, Dubuque	31 min
Aug 10, 3:49 PM CDT	Severe Thunderstorm Warning	DVN	Benton, Buchanan, Iowa	41 min
Aug 10, 4:04 PM CDT	Severe Thunderstorm Warning	DVN	Delaware, Dubuque, Jackson, Jones, Linn	56 min
Aug 10, 4:28 PM CDT	Severe Thunderstorm Warning	DVN	Benton, Buchanan, Delaware, Linn	36 min
Aug 10, 5:00 PM CDT	Severe Thunderstorm Warning	DVN	Clinton, Jackson, Jones	45 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.