Alert archive / Iowa / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 116, NWS Quad Cities, IA

December 15, 2021Delaware County, Dubuque County, Jones County, Iowa

NWS Quad Cities, IA issued this severe thunderstorm warning at Dec 15, 2021, 8:44 PM CST for Delaware County, Dubuque County, Jones County, Iowa. It was in force for 61 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, 8:44 PM CST (02:44 UTC)
Expired: Dec 15, 2021, 9:45 PM CST
In force: 61 min
Issued by: NWS Quad Cities, IA
Area: Storm-based polygon
Damage threat: Considerable
Hail: 0.75 in
Wind: 70.0 mph

Counties Delaware County, IA, Dubuque County, IA, Jones County, IA

The radar

The Quad Cities radar (KDVN), 86 km from the middle of the area, began a volume at 02:45 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, 8:49 PM CST	TSTM WND DMG	Greeley, IA	HOUSE AND ROOF DAMAGE IN GREELEY AND ONEIDA.
Dec 15, 9:03 PM CST	TSTM WND GST 59	1 Ssw Fairview, IA	DELAYED REPORT. IADOT RWIS.

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, 2.7 hours before the alert went out and 89 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.

968 
WUUS53 KDVN 160244
SVRDVN
IAC055-061-105-160345-
/O.NEW.KDVN.SV.W.0116.211216T0244Z-211216T0345Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Quad Cities IA/IL
844 PM CST Wed Dec 15 2021

The National Weather Service in the Quad Cities has issued a

* Severe Thunderstorm Warning for...
  Western Dubuque County in northeastern Iowa...
  Jones County in east central Iowa...
  Eastern Delaware County in northeastern Iowa...

* Until 945 PM CST.

* At 844 PM CST, severe thunderstorms were located along a line
  extending from near Edgewood to near Bertram, moving northeast at
  55 mph.

  HAZARD...70 mph wind gusts.

  SOURCE...Radar indicated.

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

* Severe thunderstorms will be near...
  Greeley around 850 PM CST.
  Colesburg and Stone City around 855 PM CST.
  Anamosa around 900 PM CST.

Other locations in the path of these severe thunderstorms include
Olin, Langworthy, Center Junction, Wyoming, Onslow and Canton.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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

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

&&

LAT...LON 4195 9090 4195 9137 4265 9134 4265 9090
      4267 9089
TIME...MOT...LOC 0244Z 243DEG 48KT 4260 9144 4196 9150 

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

$$

McClure

3 follow-up statements

486 
WWUS53 KDVN 160300
SVSDVN

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

IAC055-061-105-160345-
/O.CON.KDVN.SV.W.0116.000000T0000Z-211216T0345Z/
Dubuque IA-Jones IA-Delaware IA-
900 PM CST Wed Dec 15 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 945 PM CST
FOR WESTERN DUBUQUE...JONES AND EASTERN DELAWARE COUNTIES...

At 900 PM CST, severe thunderstorms were located along a line
extending from near Colesburg to near Morley, moving northeast at 55
mph.

HAZARD...70 mph wind gusts.

SOURCE...Radar indicated.

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

Locations impacted include...
Anamosa, Dyersville, Monticello, Cascade, Epworth, Farley, Earlville,
Olin, Hopkinton, Wyoming, Oxford Junction, Delhi, New Vienna,
Colesburg, Worthington, Holy Cross, Greeley, Martelle, Luxemburg and
Onslow.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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

&&

LAT...LON 4195 9090 4195 9137 4265 9134 4265 9090
      4267 9089
TIME...MOT...LOC 0300Z 243DEG 48KT 4269 9119 4205 9126 

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

$$

McClure

885 
WWUS53 KDVN 160325
SVSDVN

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

IAC055-061-160335-
/O.CAN.KDVN.SV.W.0116.000000T0000Z-211216T0345Z/
Dubuque IA-Delaware IA-
925 PM CST Wed Dec 15 2021

...THE SEVERE THUNDERSTORM WARNING FOR WESTERN DUBUQUE AND EASTERN
DELAWARE COUNTIES IS CANCELLED...

The storms which prompted the warning have moved out of the warned 
area. Therefore, the warning has been cancelled.

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

LAT...LON 4195 9090 4195 9123 4226 9103 4230 9102
      4230 9090
TIME...MOT...LOC 0325Z 268DEG 43KT 4222 9091 4200 9099 

$$

IAC105-160345-
/O.CON.KDVN.SV.W.0116.000000T0000Z-211216T0345Z/
Jones IA-
925 PM CST Wed Dec 15 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 945 PM CST
FOR EASTERN JONES COUNTY...

At 925 PM CST, severe thunderstorms were located along a line
extending from near Canton to near Oxford Junction, moving east at 50
mph.

HAZARD...70 mph wind gusts.

SOURCE...Radar indicated.

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

Locations impacted include...
Cascade, Olin, Wyoming, Oxford Junction, Onslow, Center Junction,
Canton, Hale, Oxford Mills and Temple Hill.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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

&&

LAT...LON 4195 9090 4195 9123 4226 9103 4230 9102
      4230 9090
TIME...MOT...LOC 0325Z 268DEG 43KT 4222 9091 4200 9099 

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

$$

McClure

277 
WWUS53 KDVN 160337
SVSDVN

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

IAC105-160347-
/O.EXP.KDVN.SV.W.0116.000000T0000Z-211216T0345Z/
Jones IA-
937 PM CST Wed Dec 15 2021

...THE SEVERE THUNDERSTORM WARNING FOR EASTERN JONES COUNTY WILL
EXPIRE AT 945 PM CST...
    
The storms which prompted the warning have moved out of the area.
Therefore, the warning will be allowed to expire.  However gusty
winds are still possible with these thunderstorms.

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

LAT...LON 4195 9090 4195 9123 4226 9103 4230 9102
      4230 9090
TIME...MOT...LOC 0337Z 270DEG 48KT 4229 9073 4207 9081 

$$

McClure

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, 8:06 PM CST	Tornado Warning	DVN	Benton, Buchanan	20 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, 8:50 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

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.