Alert archive / Iowa / Tornado Warnings in 2024

Tornado Warning 21, NWS Quad Cities, IA

May 21, 2024Benton County, Buchanan County, Iowa

NWS Quad Cities, IA issued this tornado warning at May 21, 2024, 6:32 PM CDT for Benton County, Buchanan County, Iowa. It was in force for 28 min. 4 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: May 21, 2024, 6:32 PM CDT (23:32 UTC)
Expired: May 21, 2024, 7:00 PM CDT
In force: 28 min
Issued by: NWS Quad Cities, IA
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 1.0 in

Counties Benton County, IA, Buchanan County, IA

The radar

The Quad Cities radar (KDVN), 139 km from the middle of the area, began a volume at 23:35 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
May 21, 6:36 PM CDT	TSTM WND GST 60	2 W Garrison, IA
May 21, 6:36 PM CDT	TSTM WND GST 60	2 W Garrison, IA
May 21, 6:52 PM CDT	TSTM WND DMG	1 Wnw Independence, IA	Widespread tree damage in northwest Independence. Trees uprooted and blown over. Some roof damage to sheds nearby. Leaning power poles. Time estimated from radar.
May 21, 6:52 PM CDT	TSTM WND DMG	1 Wnw Independence, IA	Widespread tree damage in northwest Independence. Trees uprooted and blown over. Some roof damage to sheds nearby. Leaning power poles. 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
May 21, 1:14 PM CDT	Tornado Watch PDS	SPC	8 hr

The nearest sounding before it

Davenport, (KDVN), launched 12:00Z, 11.5 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: 1292 J/kg
Mixed-layer CIN: -75 J/kg
Mixed-layer LCL: 1074 m above ground
0-6 km bulk shear: 34 kt
0-1 km storm-relative helicity: 21 m²/s²
0-3 km storm-relative helicity: 63 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 1.4

Open this sounding in Storm Lab

The text

As transmitted.

827 
WFUS53 KDVN 212332
TORDVN
IAC011-019-220000-
/O.NEW.KDVN.TO.W.0021.240521T2332Z-240522T0000Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Quad Cities IA/IL
632 PM CDT Tue May 21 2024

The National Weather Service in the Quad Cities has issued a

* Tornado Warning for...
  Southern Buchanan County in northeastern Iowa...
  Northern Benton County in east central Iowa...

* Until 700 PM CDT.

* At 632 PM CDT, a severe thunderstorm capable of producing a tornado
  was located near Garrison, or 9 miles west of Vinton, moving
  northeast at 65 mph.

  HAZARD...Tornado and quarter size hail.

  SOURCE...Radar indicated rotation.

  IMPACT...Flying debris will be dangerous to those caught without 
           shelter. Mobile homes will be damaged or destroyed. 
           Damage to roofs, windows, and vehicles will occur.  Tree 
           damage is likely.

* This dangerous storm will be near...
  Vinton, Garrison, Mount Auburn, Vinton Memorial Airport, Rodgers 
  Park, Minne Estema Park, and Benton County Fairgrounds around 635 
  PM CDT.
  Urbana, Brandon, Lime Creek County Park, and Cheney around 640 PM 
  CDT.
  Rowley and Spencers Grove around 645 PM CDT.
  Independence, Quasqueton, Wapsipinicon Golf Course, Independence 
  Airport, and Buchanan County Fairgrounds around 650 PM CDT.

Other locations in the path of this tornadic thunderstorm include
Winthrop.

This includes Interstate 380 between mile markers 43 and 55.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.

&&

LAT...LON 4230 9214 4230 9206 4238 9206 4252 9192
      4248 9161 4242 9160 4230 9179 4230 9183
      4227 9183 4203 9221 4212 9230 4214 9230
TIME...MOT...LOC 2332Z 222DEG 60KT 4213 9220 

TORNADO...RADAR INDICATED
MAX HAIL SIZE...1.00 IN

$$

Ervin

2 follow-up statements

050 
WWUS53 KDVN 212343
SVSDVN

Severe Weather Statement
National Weather Service Quad Cities IA/IL
643 PM CDT Tue May 21 2024

IAC011-019-220000-
/O.CON.KDVN.TO.W.0021.000000T0000Z-240522T0000Z/
Buchanan IA-Benton IA-
643 PM CDT Tue May 21 2024

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 700 PM CDT FOR SOUTHERN
BUCHANAN AND NORTHEASTERN BENTON COUNTIES...

At 642 PM CDT, a severe thunderstorm capable of producing a tornado
was located over Brandon, or 8 miles north of Vinton, moving
northeast at 70 mph.

HAZARD...Tornado and quarter size hail.

SOURCE...Radar indicated rotation.

IMPACT...Flying debris will be dangerous to those caught without 
         shelter. Mobile homes will be damaged or destroyed. Damage 
         to roofs, windows, and vehicles will occur.  Tree damage is 
         likely.

This dangerous storm will be near...
  Independence, Winthrop, Quasqueton, Rowley, Wapsipinicon Golf 
  Course, Independence Airport, and Buchanan County Fairgrounds 
  around 650 PM CDT.

This includes Interstate 380 between mile markers 44 and 55.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.

&&

LAT...LON 4230 9214 4230 9206 4238 9206 4252 9192
      4248 9161 4242 9160 4230 9179 4230 9183
      4227 9183 4219 9201 4223 9208 4227 9216
TIME...MOT...LOC 2342Z 221DEG 64KT 4229 9201 

TORNADO...RADAR INDICATED
MAX HAIL SIZE...1.00 IN

$$

Ervin

724 
WWUS53 KDVN 212351
SVSDVN

Severe Weather Statement
National Weather Service Quad Cities IA/IL
651 PM CDT Tue May 21 2024

IAC011-019-220000-
/O.CON.KDVN.TO.W.0021.000000T0000Z-240522T0000Z/
Buchanan IA-Benton IA-
651 PM CDT Tue May 21 2024

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 700 PM CDT FOR SOUTHERN
BUCHANAN AND NORTHEASTERN BENTON COUNTIES...

At 650 PM CDT, a severe thunderstorm capable of producing a tornado
was located over Rowley, or near Independence, moving northeast at 70
mph.

HAZARD...Tornado and quarter size hail.

SOURCE...Radar indicated rotation.

IMPACT...Flying debris will be dangerous to those caught without 
         shelter. Mobile homes will be damaged or destroyed. Damage 
         to roofs, windows, and vehicles will occur.  Tree damage is 
         likely.

This dangerous storm will be near...
  Independence, Winthrop, Quasqueton, Wapsipinicon Golf Course, and 
  Buchanan County Fairgrounds around 655 PM CDT.

This includes Interstate 380 between mile markers 47 and 54.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.

&&

LAT...LON 4230 9202 4238 9206 4252 9192 4248 9161
      4242 9160 4230 9179 4230 9183 4227 9183
      4226 9190 4228 9194
TIME...MOT...LOC 2350Z 222DEG 60KT 4240 9188 

TORNADO...RADAR INDICATED
MAX HAIL SIZE...1.00 IN

$$

Ervin

The office that day

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

Issued	Product	Office	Counties	Lasted
May 20, 7:43 PM CDT	River Flood Watch	DVN	Benton, Iowa	14 hr
May 20, 7:47 PM CDT	River Flood Watch	DVN	Keokuk	3 hr
May 20, 7:47 PM CDT	River Flood Watch	DVN	Clinton, Scott	3 days
May 20, 10:17 PM CDT	River Flood Warning	DVN	Keokuk	7 days
May 21, 1:45 AM CDT	Flood Watch	DVN	Benton, Buchanan, Delaware, Iowa, Johnson, Linn	19 hr
May 21, 6:21 AM CDT	Severe Thunderstorm Warning	DVN	Benton	39 min
May 21, 6:51 AM CDT	Severe Thunderstorm Warning	DVN	Benton, Iowa, Linn	28 min
May 21, 8:46 AM CDT	Special Weather Statement	DVN	Jones	44 min
May 21, 9:40 AM CDT	River Flood Warning	DVN	Benton, Iowa	14 days
May 21, 10:54 AM CDT	Special Weather Statement	DVN	Benton, Buchanan, Delaware, Dubuque, Linn	51 min
May 21, 10:56 AM CDT	River Flood Watch	DVN	Cedar, Jones, Linn	6 days
May 21, 11:51 AM CDT	Severe Thunderstorm Warning	DVN	Iowa	54 min
May 21, 12:34 PM CDT	Flash Flood Warning	DVN	Iowa	4 hr
May 21, 12:43 PM CDT	Severe Thunderstorm Warning	DVN	Benton, Iowa, Johnson, Linn	29 min
May 21, 1:16 PM CDT	Special Weather Statement	DVN	Johnson, Jones, Linn	59 min
May 21, 2:52 PM CDT	Severe Thunderstorm Warning	DVN	Delaware, Dubuque, Jones	43 min
May 21, 3:28 PM CDT	Severe Thunderstorm Warning	DVN	Dubuque	33 min
May 21, 5:21 PM CDT	Severe Thunderstorm Warning	DVN	Van Buren	39 min
May 21, 5:43 PM CDT	Severe Thunderstorm Warning Considerable damage threat	DVN	Benton, Buchanan	47 min
May 21, 5:54 PM CDT	Severe Thunderstorm Warning	DVN	Delaware, Dubuque, Jones	51 min
May 21, 5:54 PM CDT	Severe Thunderstorm Warning Considerable damage threat	DVN	Henry, Jefferson, Van Buren, Washington	33 min
May 21, 6:02 PM CDT	Severe Thunderstorm Warning	DVN	Cedar, Clinton, Jackson, Jones	43 min
May 21, 6:05 PM CDT	Severe Thunderstorm Warning Considerable damage threat	DVN	Des Moines, Henry, Lee, Louisa, Van Buren	25 min
May 21, 6:18 PM CDT	Severe Thunderstorm Warning Considerable damage threat	DVN	Benton, Iowa, Johnson, Keokuk	42 min
May 21, 6:24 PM CDT	Severe Thunderstorm Warning Considerable damage threat	DVN	Benton, Buchanan, Delaware, Linn	51 min
May 21, 6:29 PM CDT	Severe Thunderstorm Warning	DVN	Dubuque	31 min
May 21, 6:38 PM CDT	Severe Thunderstorm Warning	DVN	Cedar, Clinton, Johnson, Louisa, Muscatine, Scott	52 min
May 21, 6:43 PM CDT	Severe Thunderstorm Warning	DVN	Van Buren	47 min
May 21, 6:47 PM CDT	Severe Thunderstorm Warning Considerable damage threat	DVN	Jackson	43 min
May 21, 6:52 PM CDT	Severe Thunderstorm Warning Considerable damage threat	DVN	Benton, Buchanan, Delaware, Johnson, Jones, Linn	38 min
May 21, 6:55 PM CDT	Severe Thunderstorm Warning Considerable damage threat	DVN	Cedar, Clinton, Jackson, Jones	50 min

Nearby

Tornado Warnings in Iowa, 2024 Every tornado warning in 2024 Tornadoes in 2024

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.