Alert archive / Iowa / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 88, NWS Quad Cities, IA

August 24, 20215 counties in Iowa

NWS Quad Cities, IA issued this severe thunderstorm warning at Aug 24, 2021, 2:49 PM CDT for 5 counties in Iowa. It was in force for 56 min. 12 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, 2:49 PM CDT (19:49 UTC)
Expired: Aug 24, 2021, 3:45 PM CDT
In force: 56 min
Issued by: NWS Quad Cities, IA
Area: Storm-based polygon
Damage threat: Considerable
Hail: 0.75 in
Wind: 70.0 mph

Counties Benton County, IA, Buchanan County, IA, Delaware County, IA, Jones County, IA, Linn County, IA

The radar

The Quad Cities radar (KDVN), 130 km from the middle of the area, began a volume at 19:52 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	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.
Aug 24, 3:19 PM CDT	TSTM WND DMG	1 N Manchester Airport, IA	EM RELAYED REPORT OF A POLE BARN FLATTENED NORTHWEST OF MANCHESTER. TIME ESTIMATED FROM RADAR.
Aug 24, 3:25 PM CDT	TSTM WND DMG	1 E Manchester, IA	ROOF PEELED OFF DOWNTOWN BUILDING. ALSO SEVERAL TREES DOWN IN DOWNTOWN. TIME ESTIMATED FROM RADAR.
Aug 24, 3:26 PM CDT	HAIL 1.75	3 Ne Manchester Airport, IA	TIME ESTIMATED RADAR.
Aug 24, 3:40 PM CDT	TSTM WND DMG	1 W Manchester, IA	REPORT FROM MPING: TREES UPROOTED OR SNAPPED; ROOF BLOWN OFF.
Aug 24, 3:41 PM CDT	TSTM WND GST 60	Oneida, IA
Aug 24, 3:44 PM CDT	HAIL 0.7	Oneida, IA
Aug 24, 3:53 PM CDT	TSTM WND DMG	Hopkinton, IA	SEVERAL LARGE TREES DOWN IN TOWN, TIME ESTIMATED FROM 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 24, 1:52 PM CDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Davenport, (KDVN), launched 12:00Z, 7.8 hours before the alert went out and 134 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.

701 
WUUS53 KDVN 241949
SVRDVN
IAC011-019-055-105-113-242045-
/O.NEW.KDVN.SV.W.0088.210824T1949Z-210824T2045Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Quad Cities IA/IL
249 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...
  Northern Benton County in east central Iowa...
  Northwestern Jones County in east central Iowa...
  Delaware County in northeastern Iowa...
  Northern Linn County in east central Iowa...

* Until 345 PM CDT.

* At 249 PM CDT, severe thunderstorms were located along a line
  extending from near Oelwein to near Independence to La Porte City,
  moving east at 45 mph.

  HAZARD...70 mph wind gusts.

  SOURCE...Trained weather spotters.

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

* Severe thunderstorms will be near...
  Stanley around 255 PM CDT.
  Vinton, Winthrop, Quasqueton and Aurora around 300 PM CDT.
  Lamont around 305 PM CDT.

Other locations in the path of these severe thunderstorms include
Urbana, Masonville, Manchester, Center Point, Walker, Dundee,
Edgewood, Ryan, Troy Mills, Alburnett, Delhi, Greeley, Delaware,
Oneida, Paris, Central City, Earlville, Coggon and Colesburg.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4228 9113 4208 9129 4221 9230 4226 9230
      4230 9226 4230 9206 4246 9207 4252 9200
      4264 9194 4265 9113
TIME...MOT...LOC 1949Z 287DEG 41KT 4270 9186 4252 9187 4232 9215 

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

$$

Ervin

5 follow-up statements

082 
WWUS53 KDVN 241954
SVSDVN

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

IAC011-019-055-105-113-242045-
/O.CON.KDVN.SV.W.0088.000000T0000Z-210824T2045Z/
Buchanan IA-Benton IA-Jones IA-Delaware IA-Linn IA-
254 PM CDT Tue Aug 24 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 345 PM CDT
FOR BUCHANAN...NORTHERN BENTON...NORTHWESTERN JONES...DELAWARE AND
NORTHERN LINN COUNTIES...

At 254 PM CDT, severe thunderstorms were located along a line
extending from near Stanley to near Independence to near Dysart,
moving east at 45 mph.

HAZARD...70 mph wind gusts.

SOURCE...Trained weather spotters.

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

These severe storms will be near...
  Independence, Winthrop, Aurora and Stanley around 300 PM CDT.
  Quasqueton around 305 PM CDT.

Other locations in the path of these severe thunderstorms include
Vinton, Lamont, Masonville, Dundee, Manchester, Urbana, Edgewood,
Ryan, Center Point, Delaware, Delhi, Greeley, Oneida, Earlville,
Hopkinton and Colesburg.

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 4228 9113 4208 9129 4221 9230 4226 9230
      4230 9226 4230 9206 4246 9207 4252 9200
      4264 9194 4265 9113
TIME...MOT...LOC 1954Z 287DEG 39KT 4269 9181 4251 9184 4224 9227 

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

$$

Ervin

524 
WWUS53 KDVN 242006
SVSDVN

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

IAC011-019-055-105-113-242045-
/O.CON.KDVN.SV.W.0088.000000T0000Z-210824T2045Z/
Buchanan IA-Benton IA-Jones IA-Delaware IA-Linn IA-
306 PM CDT Tue Aug 24 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 345 PM CDT
FOR SOUTHERN BUCHANAN...NORTHERN BENTON...NORTHWESTERN JONES...
SOUTHERN DELAWARE AND NORTHERN LINN COUNTIES...

At 306 PM CDT, severe thunderstorms were located along a line
extending from Rowley to near Urbana to near Garrison, moving
southeast at 45 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

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

These severe storms will be near...
  Urbana, Walker, Quasqueton and Rowley around 310 PM CDT.

Other locations in the path of these severe thunderstorms include
Center Point, Troy Mills, Paris, Alburnett, Coggon, Ryan, Central
City, Prairieburg, Waubeek, Anamosa, Monticello, Stone City and
Langworthy.

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 4228 9113 4208 9129 4221 9230 4226 9230
      4230 9226 4230 9206 4240 9206 4245 9205
      4241 9183 4235 9113
TIME...MOT...LOC 2006Z 293DEG 37KT 4236 9182 4227 9193 4219 9213 

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

$$

Ervin

898 
WWUS53 KDVN 242019
SVSDVN

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

IAC011-019-055-105-113-242045-
/O.CON.KDVN.SV.W.0088.000000T0000Z-210824T2045Z/
Buchanan IA-Benton IA-Jones IA-Delaware IA-Linn IA-
319 PM CDT Tue Aug 24 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 345 PM CDT
FOR SOUTHERN BUCHANAN...NORTHERN BENTON...NORTHWESTERN JONES...
SOUTHERN DELAWARE AND NORTHERN LINN COUNTIES...

At 319 PM CDT, severe thunderstorms were located along a line
extending from near Troy Mills to near Center Point to near Vinton,
moving east at 45 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

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

These severe storms will be near...
  Troy Mills around 325 PM CDT.

Other locations in the path of these severe thunderstorms include
Alburnett, Coggon, Ryan, Paris, Central City, Prairieburg, Waubeek,
Anamosa, Monticello, Stone City and Langworthy.

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 4228 9113 4208 9129 4221 9230 4223 9223
      4226 9215 4230 9206 4236 9205 4241 9191
      4241 9183 4235 9113
TIME...MOT...LOC 2019Z 287DEG 41KT 4232 9165 4223 9176 4215 9196 

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

$$

Ervin

537 
WWUS53 KDVN 242025
SVSDVN

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

IAC011-019-055-105-113-242045-
/O.CON.KDVN.SV.W.0088.000000T0000Z-210824T2045Z/
Buchanan IA-Benton IA-Jones IA-Delaware IA-Linn IA-
325 PM CDT Tue Aug 24 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 345 PM CDT
FOR SOUTHEASTERN BUCHANAN...NORTHEASTERN BENTON...NORTHWESTERN
JONES...SOUTHERN DELAWARE AND NORTHERN LINN COUNTIES...

At 325 PM CDT, severe thunderstorms were located along a line
extending from near Ryan to near Troy Mills to near Center Point,
moving east at 45 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

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

These severe storms will be near...
  Coggon, Ryan and Paris around 330 PM CDT.
  Central City and Prairieburg around 335 PM CDT.

Other locations in the path of these severe thunderstorms include
Waubeek, Hopkinton, Monticello, Stone City, Anamosa and Langworthy.

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 4228 9113 4208 9129 4219 9211 4221 9216
      4225 9212 4230 9206 4233 9197 4238 9187
      4241 9183 4235 9113
TIME...MOT...LOC 2025Z 286DEG 41KT 4233 9153 4221 9169 4215 9180 

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

$$

Ervin

589 
WWUS53 KDVN 242044
SVSDVN

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

IAC011-019-055-105-113-242054-
/O.EXP.KDVN.SV.W.0088.000000T0000Z-210824T2045Z/
Buchanan IA-Benton IA-Jones IA-Delaware IA-Linn IA-
344 PM CDT Tue Aug 24 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN BUCHANAN...
NORTHEASTERN BENTON...NORTHWESTERN JONES...SOUTHERN DELAWARE AND
NORTHERN LINN COUNTIES WILL EXPIRE AT 345 PM CDT...
            
The storms which prompted the warning have weakened below severe
limits, and no longer pose an immediate threat to life or property.
Therefore, the warning will be allowed to expire.  However gusty
winds and heavy rain are still possible with these thunderstorms.

A Severe Thunderstorm Watch remains in effect until 700 PM CDT for
northeastern and east central Iowa.

LAT...LON 4228 9113 4208 9129 4219 9211 4221 9216
      4225 9212 4230 9206 4233 9197 4238 9187
      4241 9183 4235 9113
TIME...MOT...LOC 2044Z 287DEG 41KT 4227 9126 4215 9142 4209 9153 

$$

Ervin

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 24, 2:21 PM CDT	Severe Thunderstorm Warning	DVN	Buchanan	39 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.