Alert archive / Iowa / Tornado Warnings in 2021

Tornado Warning 24, NWS Quad Cities, IA

August 24, 2021Dubuque County, Iowa

NWS Quad Cities, IA issued this tornado warning at Aug 24, 2021, 3:38 PM CDT for Dubuque County, Iowa. It was in force for 25 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Aug 24, 2021, 3:38 PM CDT (20:38 UTC)
Expired: Aug 24, 2021, 4:03 PM CDT
In force: 25 min
Issued by: NWS Quad Cities, IA
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.75 in

County Dubuque County, IA

The radar

The Quad Cities radar (KDVN), 115 km from the middle of the area, began a volume at 20:41 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.

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, 8.6 hours before the alert went out and 115 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.

112 
WFUS53 KDVN 242038
TORDVN
IAC061-242115-
/O.NEW.KDVN.TO.W.0024.210824T2038Z-210824T2115Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Quad Cities IA/IL
338 PM CDT Tue Aug 24 2021

The National Weather Service in the Quad Cities has issued a

* Tornado Warning for...
  North central Dubuque County in northeastern Iowa...

* Until 415 PM CDT.
    
* At 337 PM CDT, a severe thunderstorm capable of producing a tornado
  was located over Sherrill, or 10 miles northwest of Dubuque, moving
  east at 15 mph.

  HAZARD...Tornado.

  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 tornadic thunderstorm will remain over mainly rural areas of
  north central Dubuque County, including the following locations...
  Finley's Landing Park and Mud Lake Park.

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 4265 9077 4264 9071 4263 9070 4261 9069
      4263 9082 4266 9082
TIME...MOT...LOC 2037Z 279DEG 15KT 4264 9078 

TORNADO...RADAR INDICATED
MAX HAIL SIZE...<.75 IN

$$

Gibbs

2 follow-up statements

509 
WWUS53 KDVN 242043
SVSDVN

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

IAC061-242115-
/O.CON.KDVN.TO.W.0024.000000T0000Z-210824T2115Z/
Dubuque IA-
343 PM CDT Tue Aug 24 2021

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 415 PM CDT FOR
NORTHEASTERN DUBUQUE COUNTY...
    
At 342 PM CDT, a severe thunderstorm capable of producing a tornado
was located over Sherrill, or 9 miles north of Dubuque, moving east
at 15 mph.

HAZARD...Tornado.

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.

Locations impacted include...
Mud Lake Park.

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 4265 9077 4264 9071 4263 9070 4261 9069
      4263 9080 4266 9080
TIME...MOT...LOC 2042Z 279DEG 15KT 4264 9075 

TORNADO...RADAR INDICATED
MAX HAIL SIZE...<.75 IN

$$

Gibbs

805 
WWUS53 KDVN 242103
SVSDVN

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

IAC061-242112-
/O.CAN.KDVN.TO.W.0024.000000T0000Z-210824T2115Z/
Dubuque IA-
403 PM CDT Tue Aug 24 2021

...THE TORNADO WARNING FOR NORTHEASTERN DUBUQUE COUNTY IS
CANCELLED...
        
The storm which prompted the warning has moved out of the area.
Therefore, the warning has been cancelled.

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

Remember, a Severe Thunderstorm Warning still remains in effect for
Dubuque County until 430 PM CDT.

LAT...LON 4265 9077 4264 9071 4263 9070 4261 9069
      4263 9080 4266 9080
TIME...MOT...LOC 2101Z 279DEG 15KT 4263 9064 

$$

Gibbs

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, 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, 3:42 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

Tornado Warnings in Iowa, 2021 Every tornado warning in 2021 Tornadoes 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.