Alert archive / Iowa / Tornado Warnings in 2021

Tornado Warning 30, NWS Quad Cities, IA

December 15, 2021Benton County, Buchanan County, Iowa

NWS Quad Cities, IA issued this tornado warning at Dec 15, 2021, 8:06 PM CST for Benton County, Buchanan County, Iowa. It was in force for 20 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: Dec 15, 2021, 8:06 PM CST (02:06 UTC)
Expired: Dec 15, 2021, 8:26 PM CST
In force: 20 min
Issued by: NWS Quad Cities, IA
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.75 in

Counties Benton County, IA, Buchanan County, IA

The radar

The Quad Cities radar (KDVN), 136 km from the middle of the area, began a volume at 02:07 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
Dec 15, 8:13 PM CST	TSTM WND DMG	2 Ssw Cheney, IA	TREE DOWN OVER HIGHWAY 150.
Dec 15, 8:20 PM CST	TSTM WND GST 76	2 Sw Cheney, 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
Dec 15, 5:30 PM CST	Tornado Watch	SPC	6 hr

The nearest sounding before it

Davenport, (KDVN), launched 00:00Z, 2.1 hours before the alert went out and 141 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: 229 J/kg
Mixed-layer CIN: -358 J/kg
Mixed-layer LCL: 1061 m above ground
0-6 km bulk shear: 56 kt
0-1 km storm-relative helicity: 433 m²/s²
0-3 km storm-relative helicity: 496 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

201 
WFUS53 KDVN 160206
TORDVN
IAC011-019-160245-
/O.NEW.KDVN.TO.W.0030.211216T0206Z-211216T0245Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Quad Cities IA/IL
806 PM CST Wed Dec 15 2021

The National Weather Service in the Quad Cities has issued a

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

* Until 845 PM CST.
    
* At 805 PM CST, a severe thunderstorm capable of producing a tornado
  was located near Brandon, or 7 miles north of Vinton, moving
  northeast at 60 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 dangerous storm will be near...
  Rowley around 815 PM CST.
  Independence and Quasqueton around 820 PM CST.
  Winthrop around 825 PM CST.

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.

This cluster of thunderstorms is capable of producing tornadoes and
widespread significant wind damage. Do not wait to see or hear the
tornado. For your protection move to an interior room on the lowest
floor of a building.

&&

LAT...LON 4249 9161 4218 9196 4224 9212 4232 9204
      4259 9184
TIME...MOT...LOC 0205Z 219DEG 54KT 4226 9199 

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

$$

Uttech

3 follow-up statements

721 
WWUS53 KDVN 160217
SVSDVN

Severe Weather Statement
National Weather Service Quad Cities IA/IL
817 PM CST Wed Dec 15 2021

IAC011-160227-
/O.CAN.KDVN.TO.W.0030.000000T0000Z-211216T0245Z/
Benton IA-
817 PM CST Wed Dec 15 2021

...THE TORNADO WARNING FOR NORTHEASTERN BENTON COUNTY IS CANCELLED...
    
The tornadic thunderstorm which prompted the warning has moved out 
of the warned area. Therefore, the warning has been cancelled.

A Tornado Watch remains in effect until 1100 PM CST for northeastern
Iowa.

LAT...LON 4230 9182 4231 9202 4237 9200 4259 9184
      4249 9161
TIME...MOT...LOC 0217Z 222DEG 48KT 4241 9182 

$$

IAC019-160245-
/O.CON.KDVN.TO.W.0030.000000T0000Z-211216T0245Z/
Buchanan IA-
817 PM CST Wed Dec 15 2021

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 845 PM CST FOR CENTRAL
BUCHANAN COUNTY...
    
At 817 PM CST, a severe thunderstorm capable of producing a tornado
was located near Quasqueton, or near Independence, moving northeast
at 55 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 dangerous storm will be near...
  Winthrop around 825 PM CST.

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.

This cluster of thunderstorms is capable of producing tornadoes and
widespread significant wind damage. Do not wait to see or hear the
tornado. For your protection move to an interior room on the lowest
floor of a building.

&&

LAT...LON 4230 9182 4231 9202 4237 9200 4259 9184
      4249 9161
TIME...MOT...LOC 0217Z 222DEG 48KT 4241 9182 

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

$$

Uttech

025 
WWUS53 KDVN 160222
SVSDVN

Severe Weather Statement
National Weather Service Quad Cities IA/IL
822 PM CST Wed Dec 15 2021

IAC019-160245-
/O.CON.KDVN.TO.W.0030.000000T0000Z-211216T0245Z/
Buchanan IA-
822 PM CST Wed Dec 15 2021

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 845 PM CST FOR EASTERN
BUCHANAN COUNTY...
    
At 822 PM CST, a severe thunderstorm capable of producing a tornado
was located near Winthrop, or 9 miles northeast of Independence,
moving northeast at 60 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
eastern Buchanan County, including the following locations...
Winthrop Golf Course.

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.

This cluster of thunderstorms is capable of producing tornadoes and
widespread significant wind damage. Do not wait to see or hear the
tornado. For your protection move to an interior room on the lowest
floor of a building.

&&

LAT...LON 4236 9175 4251 9188 4258 9183 4249 9161
TIME...MOT...LOC 0222Z 217DEG 53KT 4252 9173 

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

$$

Uttech

797 
WWUS53 KDVN 160226
SVSDVN

Severe Weather Statement
National Weather Service Quad Cities IA/IL
826 PM CST Wed Dec 15 2021

IAC019-160235-
/O.CAN.KDVN.TO.W.0030.000000T0000Z-211216T0245Z/
Buchanan IA-
826 PM CST Wed Dec 15 2021

...THE TORNADO WARNING FOR EASTERN BUCHANAN COUNTY IS CANCELLED...
        
The storm which prompted the warning has moved out of the area.
Therefore, the warning has been cancelled.  However strong winds are 
still expected.

A Tornado Watch remains in effect until 1100 PM CST for northeastern
Iowa.

LAT...LON 4236 9175 4251 9188 4258 9183 4249 9161
TIME...MOT...LOC 0223Z 219DEG 54KT 4256 9169 

$$

Uttech

The office that day

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

Issued	Product	Office	Counties	Lasted
Dec 15, 7:17 PM CST	Severe Thunderstorm Warning Destructive damage threat	DVN	Benton, Iowa	58 min
Dec 15, 7:31 PM CST	Severe Thunderstorm Warning Considerable damage threat	DVN	Jefferson, Keokuk, Van Buren	59 min
Dec 15, 7:33 PM CST	Severe Thunderstorm Warning Considerable damage threat	DVN	Buchanan	57 min
Dec 15, 8:08 PM CST	Severe Thunderstorm Warning Considerable damage threat	DVN	Buchanan, Delaware, Johnson, Linn, Louisa, Washington	67 min
Dec 15, 8:18 PM CST	Severe Thunderstorm Warning Considerable damage threat	DVN	Henry, Jefferson, Lee, Van Buren	57 min
Dec 15, 8:23 PM CST	Severe Thunderstorm Warning Considerable damage threat	DVN	Benton, Iowa	37 min
Dec 15, 8:34 PM CST	Severe Thunderstorm Warning Considerable damage threat	DVN	Jefferson, Keokuk, Van Buren	26 min
Dec 15, 8:44 PM CST	Severe Thunderstorm Warning Considerable damage threat	DVN	Delaware, Dubuque, Jones	61 min
Dec 15, 8:50 PM CST	Severe Thunderstorm Warning Considerable damage threat	DVN	Cedar, Louisa, Muscatine	55 min
Dec 15, 8:53 PM CST	Severe Thunderstorm Warning Considerable damage threat	DVN	Des Moines, Lee	67 min
Dec 15, 9:12 PM CST	Severe Thunderstorm Warning Considerable damage threat	DVN	Clinton, Dubuque, Jackson, Scott	63 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.