Alert archive / Iowa / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 87, NWS Quad Cities, IA

August 24, 2021Buchanan County, Iowa

NWS Quad Cities, IA issued this severe thunderstorm warning at Aug 24, 2021, 2:21 PM CDT for Buchanan County, Iowa. It was in force for 39 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 24, 2021, 2:21 PM CDT (19:21 UTC)
Expired: Aug 24, 2021, 3:00 PM CDT
In force: 39 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), 139 km from the middle of the area, began a volume at 19:22 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 24, 2:50 PM CDT	TSTM WND DMG	2 S Hazleton, IA	SEVERAL TREES UPROOTED SOUTH OF HAZELTON NEAR THE FONTANA TURNOFF.
Aug 24, 2:50 PM CDT	TSTM WND DMG	Fairbank, IA	SEVERAL LARGE TREE LIMBS DOWN, TIME ESTIMATED FROM RADAR.
Aug 24, 2:50 PM CDT	TSTM WND DMG	Hazleton, IA	2 LARGE TREES DOWN OVER THE ROAD WITH POWER LINES. TIME ESTIMATED FROM RADAR.
Aug 24, 2:50 PM CDT	TSTM WND GST 70	5 Sse Hazleton, IA
Aug 24, 2:52 PM CDT	TSTM WND GST 61	2 Ene Hazleton, IA
Aug 24, 2:55 PM CDT	TSTM WND DMG	Independence, IA	LARGE 8-10 INCH DIAMETER BRANCH DOWN.

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 24, 1:52 PM CDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Davenport, (KDVN), launched 12:00Z, 7.4 hours before the alert went out and 144 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: 1809 J/kg
Mixed-layer CIN: -127 J/kg
Mixed-layer LCL: 1284 m above ground
0-6 km bulk shear: 15 kt
0-1 km storm-relative helicity: 35 m²/s²
0-3 km storm-relative helicity: 9 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

826 
WUUS53 KDVN 241921
SVRDVN
IAC019-242000-
/O.NEW.KDVN.SV.W.0087.210824T1921Z-210824T2000Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Quad Cities IA/IL
221 PM CDT Tue Aug 24 2021

The National Weather Service in the Quad Cities has issued a

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

* Until 300 PM CDT.

* At 220 PM CDT, severe thunderstorms were located along a line
  extending from near Denver to Hudson, moving east at 50 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.

* Severe thunderstorms will be near...
  Fairbank around 235 PM CDT.
  Jesup around 240 PM CDT.

Other locations in the path of these severe thunderstorms include
Hazleton, Independence, Brandon, Stanley, Aurora, Winthrop,
Quasqueton, Lamont and Rowley.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4247 9161 4247 9160 4230 9160 4230 9206
      4247 9206 4247 9208 4264 9208 4264 9161
TIME...MOT...LOC 1920Z 288DEG 42KT 4264 9227 4244 9243 

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

$$

Ervin

2 follow-up statements

232 
WWUS53 KDVN 241931
SVSDVN

Severe Weather Statement
National Weather Service Quad Cities IA/IL
231 PM CDT Tue Aug 24 2021

IAC019-242000-
/O.CON.KDVN.SV.W.0087.000000T0000Z-210824T2000Z/
Buchanan IA-
231 PM CDT Tue Aug 24 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 300 PM CDT
FOR BUCHANAN COUNTY...

At 230 PM CDT, severe thunderstorms were located along a line
extending from 6 miles west of Fairbank to near Crossroads Mall,
moving east at 50 mph.

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

SOURCE...Waterloo Airport Observations.

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

These severe storms will be near...
  Fairbank around 235 PM CDT.

Other locations in the path of these severe thunderstorms include
Jesup, Hazleton, Independence, Brandon, Stanley, Aurora, Winthrop,
Quasqueton, Lamont and Rowley.

LAT...LON 4247 9161 4247 9160 4230 9160 4230 9206
      4247 9206 4247 9208 4264 9208 4264 9161
TIME...MOT...LOC 1930Z 288DEG 42KT 4262 9217 4242 9233 

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

$$

Ervin

682 
WWUS53 KDVN 241944
SVSDVN

Severe Weather Statement
National Weather Service Quad Cities IA/IL
244 PM CDT Tue Aug 24 2021

IAC019-242000-
/O.CON.KDVN.SV.W.0087.000000T0000Z-210824T2000Z/
Buchanan IA-
244 PM CDT Tue Aug 24 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 300 PM CDT
FOR BUCHANAN COUNTY...

At 243 PM CDT, severe thunderstorms were located along a line
extending from near Hazleton to near La Porte City, moving east at 50
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 storms will be near...
  Independence, Hazleton and Stanley around 250 PM CDT.

Other locations in the path of these severe thunderstorms include
Brandon, Winthrop, Quasqueton, Rowley, Aurora and Lamont.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Torrential rainfall is occurring with these storms, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4247 9161 4247 9160 4230 9160 4230 9206
      4247 9206 4247 9208 4264 9208 4264 9161
TIME...MOT...LOC 1943Z 288DEG 42KT 4257 9198 4237 9214 

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

$$

Ervin

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 24, 2:49 PM CDT	Severe Thunderstorm Warning Considerable damage threat	DVN	Benton, Buchanan, Delaware, Jones, Linn	56 min
Aug 24, 3:03 PM CDT	Severe Thunderstorm Warning Destructive damage threat	DVN	Buchanan, Delaware, Dubuque	42 min
Aug 24, 3:38 PM CDT	Tornado Warning	DVN	Dubuque	25 min
Aug 24, 3:42 PM CDT	Severe Thunderstorm Warning Destructive damage threat	DVN	Delaware, Dubuque	48 min
Aug 24, 4:07 PM CDT	Special Weather Statement	DVN	Cedar, Clinton, Jackson, Johnson	23 min
Aug 24, 4:17 PM CDT	Severe Thunderstorm Warning Considerable damage threat	DVN	Dubuque, Jackson	58 min
Aug 24, 4:54 PM CDT	Special Weather Statement	DVN	Benton	36 min
Aug 24, 5:01 PM CDT	Severe Thunderstorm Warning	DVN	Jackson	59 min
Aug 24, 5:05 PM CDT	Severe Thunderstorm Warning	DVN	Benton, Iowa	40 min
Aug 24, 5:23 PM CDT	Severe Thunderstorm Warning	DVN	Clinton, Scott	37 min
Aug 24, 5:27 PM CDT	Special Weather Statement	DVN	Johnson	48 min
Aug 24, 6:07 PM CDT	Severe Thunderstorm Warning	DVN	Cedar, Johnson, Linn	38 min
Aug 24, 6:49 PM CDT	Special Weather Statement	DVN	Scott	41 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.