Alert archive / Iowa / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 64, NWS Quad Cities, IA

August 10, 2021Buchanan County, Iowa

NWS Quad Cities, IA issued this severe thunderstorm warning at Aug 10, 2021, 2:55 PM CDT for Buchanan County, Iowa. It was in force for 50 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: Aug 10, 2021, 2:55 PM CDT (19:55 UTC)
Expired: Aug 10, 2021, 3:45 PM CDT
In force: 50 min
Issued by: NWS Quad Cities, IA
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Buchanan County, IA

The radar

The Quad Cities radar (KDVN), 145 km from the middle of the area, began a volume at 19:59 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, 3:09 PM CDT	TSTM WND GST 49	Independence Airport, IA	AWOS.
Aug 10, 3:12 PM CDT	TSTM WND GST 60	1 W Independence, IA

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, 7.9 hours before the alert went out and 149 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.

719 
WUUS53 KDVN 101955
SVRDVN
IAC019-102045-
/O.NEW.KDVN.SV.W.0064.210810T1955Z-210810T2045Z/

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

The National Weather Service in the Quad Cities has issued a

* Severe Thunderstorm Warning for...
  Buchanan County in northeastern Iowa...

* Until 345 PM CDT.

* At 255 PM CDT, severe thunderstorms were located along a line
  extending from near Fayette to Mount Auburn, moving southeast at 30
  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.

* These severe thunderstorms will remain over mainly rural areas of
  Buchanan County, including the following locations... Lime Creek
  County Park, Monti, Buchanan County Fairgrounds, Winthrop Golf
  Course, Otterville, Wapsipinicon Golf Course, Independence Airport,
  Jakway Park, Fontana County Park and Fontana Park.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4264 9161 4230 9160 4230 9206 4231 9207
      4247 9206 4247 9208 4264 9208 4265 9168
TIME...MOT...LOC 1955Z 294DEG 26KT 4284 9170 4225 9207 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Gunkel

2 follow-up statements

076 
WWUS53 KDVN 102009
SVSDVN

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

IAC019-102045-
/O.CON.KDVN.SV.W.0064.000000T0000Z-210810T2045Z/
Buchanan IA-
309 PM CDT Tue Aug 10 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 345 PM CDT
FOR BUCHANAN COUNTY...

At 308 PM CDT, severe thunderstorms were located along a line 
extending from near Volga to near Vinton, moving east-southeast at 
30 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, Jesup, Fairbank, Winthrop, Hazleton, Quasqueton,
Lamont, Brandon, Rowley, Aurora, Stanley, Lime Creek County Park,
Winthrop Golf Course, Wapsipinicon Golf Course, Fontana County Park,
Littleton, Monti, Buchanan County Fairgrounds, Otterville and
Independence Airport.

LAT...LON 4264 9161 4230 9160 4230 9206 4231 9207
      4247 9206 4247 9208 4264 9208 4265 9168
TIME...MOT...LOC 2008Z 294DEG 26KT 4281 9160 4222 9197 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Gunkel

350 
WWUS53 KDVN 102022
SVSDVN

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

IAC019-102045-
/O.CON.KDVN.SV.W.0064.000000T0000Z-210810T2045Z/
Buchanan IA-
322 PM CDT Tue Aug 10 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 345 PM CDT
FOR BUCHANAN COUNTY...

At 320 PM CDT, severe thunderstorms were located along a line 
extending from near Volga to near Urbana, moving southeast at 30 
mph. Trained spotter estimated 60 mph gust at Independence High 
School.

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

SOURCE...Trained weather spotters estimated 60 mph gust at 
         Independence High School.

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

Locations impacted include...
Independence, Jesup, Fairbank, Winthrop, Hazleton, Quasqueton,
Lamont, Brandon, Rowley, Aurora, Stanley, Lime Creek County Park,
Winthrop Golf Course, Wapsipinicon Golf Course, Fontana County Park,
Littleton, Monti, Buchanan County Fairgrounds, Otterville and
Independence Airport.

LAT...LON 4264 9161 4230 9160 4230 9206 4231 9207
      4247 9206 4247 9208 4264 9208 4265 9168
TIME...MOT...LOC 2020Z 294DEG 26KT 4277 9149 4218 9186 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Gunkel

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, 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, 4:38 PM CDT	Severe Thunderstorm Warning	DVN	Cedar, Jackson, Jones, Linn	52 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.