Alert archive / Iowa / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 119, NWS Quad Cities, IA

December 15, 20214 counties in Iowa; Jo Daviess County, Rock Island County, Illinois

NWS Quad Cities, IA issued this severe thunderstorm warning at Dec 15, 2021, 9:12 PM CST for 4 counties in Iowa; Jo Daviess County, Rock Island County, Illinois. It was in force for 63 min. 5 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, 9:12 PM CST (03:12 UTC)
Expired: Dec 15, 2021, 10:15 PM CST
In force: 63 min
Issued by: NWS Quad Cities, IA
Area: Storm-based polygon
Damage threat: Considerable
Hail: 0.75 in
Wind: 70.0 mph

Counties Clinton County, IA, Dubuque County, IA, Jackson County, IA, Scott County, IA, Jo Daviess County, IL, Rock Island County, IL

The radar

The Quad Cities radar (KDVN), 41 km from the middle of the area, began a volume at 03:17 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, 9:37 PM CST	TSTM WND GST 58	4 Sse Maysville, IA	DELAYED REPORT AND TIME ESTIMATED FROM RADAR. IADOT RWIS.
Dec 15, 9:38 PM CST	TSTM WND DMG	1 Nw Maquoketa, IA	POWER POLES BROKEN.
Dec 15, 9:39 PM CST	TSTM WND DMG	1 E Hurstville, IA	POWER POLES BROKEN.
Dec 15, 9:40 PM CST	TSTM WND GST 58	1 Wnw Maquoketa, IA	DELAYED REPORT AND TIME ESTIMATED FROM RADAR. IADOT RWIS.
Dec 15, 9:40 PM CST	TSTM WND GST 60	3 Se Maysville, 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, 3.2 hours before the alert went out and 41 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.

291 
WUUS53 KDVN 160312
SVRDVN
ILC085-161-IAC045-061-097-163-160415-
/O.NEW.KDVN.SV.W.0119.211216T0312Z-211216T0415Z/

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

The National Weather Service in the Quad Cities has issued a

* Severe Thunderstorm Warning for...
  Rock Island County in northwestern Illinois...
  Western Jo Daviess County in northwestern Illinois...
  Jackson County in east central Iowa...
  Scott County in east central Iowa...
  Central Dubuque County in northeastern Iowa...
  Clinton County in east central Iowa...

* Until 1015 PM CST.

* At 911 PM CST, severe thunderstorms were located along a line
  extending from Balltown to near Fruitland, moving east 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...
  Rickardsville, Sherrill and Balltown around 915 PM CST.
  Fairport and Illinois City around 930 PM CST.

Other locations in the path of these severe thunderstorms include
Blue Grass, Andalusia, Taylor Ridge, Buffalo, Rock Island, Milan, Oak
Grove, Moline, Bettendorf, Riverdale, East Moline, Silvis, Colona,
Coal Valley, Hampton, Le Claire, Port Byron, Rapids City, Cleveland
and Osborn.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4264 9071 4251 9064 4251 9030 4219 9031
      4212 9016 4190 9015 4175 9025 4159 9017
      4154 9020 4146 9043 4133 9044 4134 9107
      4142 9103 4145 9079 4159 9078 4160 9090
      4229 9090 4230 9095 4268 9090 4268 9089
TIME...MOT...LOC 0311Z 253DEG 46KT 4266 9085 4135 9117 

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

$$

Uttech

4 follow-up statements

066 
WWUS53 KDVN 160325 RRA
SVSDVN

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

ILC085-161-IAC045-061-097-163-160415-
/O.CON.KDVN.SV.W.0119.000000T0000Z-211216T0415Z/
Rock Island IL-Jo Daviess IL-Jackson IA-Scott IA-Dubuque IA-
Clinton IA-
925 PM CST Wed Dec 15 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1015 PM CST
FOR ROCK ISLAND...WESTERN JO DAVIESS...JACKSON...SCOTT...CENTRAL
DUBUQUE AND CLINTON COUNTIES...

At 925 PM CST, severe thunderstorms were located along a line
extending from 6 miles northeast of Sherrill to near Eliza, 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...
  Andalusia, Reynolds, Taylor Ridge, Milan, Oak Grove, Colona and 
  Coal Valley.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4264 9071 4251 9064 4251 9030 4219 9031
      4212 9016 4190 9015 4175 9025 4159 9017
      4154 9020 4146 9043 4133 9044 4134 9107
      4142 9103 4145 9079 4159 9078 4160 9090
      4229 9090 4230 9095 4268 9090 4268 9089
TIME...MOT...LOC 0325Z 262DEG 43KT 4267 9071 4133 9090 

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

$$

Uttech

482 
WWUS53 KDVN 160337 RRA
SVSDVN

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

ILC085-161-IAC045-061-097-163-160415-
/O.CON.KDVN.SV.W.0119.000000T0000Z-211216T0415Z/
Rock Island IL-Jo Daviess IL-Jackson IA-Scott IA-Dubuque IA-
Clinton IA-
937 PM CST Wed Dec 15 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1015 PM CST
FOR ROCK ISLAND...WESTERN JO DAVIESS...JACKSON...SCOTT...CENTRAL
DUBUQUE AND CLINTON COUNTIES...

At 935 PM CST, severe thunderstorms were located along a line
extending from near Platteville to near Hamlet, moving east at 55
mph.

HAZARD...70 mph wind gusts.

SOURCE...Trained weather spotters.

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

Locations impacted include...
Davenport, Dubuque, Moline, Rock Island, Bettendorf, Clinton, East
Moline, Maquoketa, Galena, Durant, Silvis, Eldridge, DeWitt, Milan,
Colona, Camanche, Asbury, Le Claire, Coal Valley and Savanna.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4264 9071 4251 9064 4251 9030 4219 9031
      4212 9016 4190 9015 4175 9025 4159 9017
      4154 9020 4146 9043 4133 9044 4134 9107
      4142 9103 4145 9079 4159 9078 4160 9090
      4229 9090 4230 9095 4268 9090 4268 9089
TIME...MOT...LOC 0335Z 253DEG 46KT 4270 9056 4137 9075 

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

$$

Uttech

153 
WWUS53 KDVN 160401
SVSDVN

Severe Weather Statement
National Weather Service Quad Cities IA/IL
1001 PM CST Wed Dec 15 2021

IAC061-160410-
/O.CAN.KDVN.SV.W.0119.000000T0000Z-211216T0415Z/
Dubuque IA-
1001 PM CST Wed Dec 15 2021

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL DUBUQUE COUNTY 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 northwestern
Illinois...and northeastern and east central Iowa.

LAT...LON 4219 9031 4212 9016 4190 9015 4175 9025
      4168 9023 4159 9017 4154 9020 4151 9035
      4146 9043 4133 9044 4133 9063 4229 9064
      4235 9059 4238 9053 4238 9048 4240 9050
      4251 9030
TIME...MOT...LOC 0400Z 249DEG 52KT 4243 9020 4135 9044 

$$

ILC085-161-IAC045-097-163-160415-
/O.CON.KDVN.SV.W.0119.000000T0000Z-211216T0415Z/
Rock Island IL-Jo Daviess IL-Jackson IA-Scott IA-Clinton IA-
1001 PM CST Wed Dec 15 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1015 PM CST
FOR EASTERN ROCK ISLAND...CENTRAL JO DAVIESS...CENTRAL JACKSON...
EASTERN SCOTT AND CLINTON COUNTIES...

At 1000 PM CST, severe thunderstorms were located along a line
extending from near Schapville to near Orion, moving east at 60 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...
Davenport, Moline, Rock Island, Bettendorf, Clinton, East Moline,
Galena, Silvis, Eldridge, DeWitt, Milan, Camanche, Le Claire, Coal
Valley, Savanna, Bellevue, Hampton, Port Byron, Preston and Rapids
City.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4219 9031 4212 9016 4190 9015 4175 9025
      4168 9023 4159 9017 4154 9020 4151 9035
      4146 9043 4133 9044 4133 9063 4229 9064
      4235 9059 4238 9053 4238 9048 4240 9050
      4251 9030
TIME...MOT...LOC 0400Z 249DEG 52KT 4243 9020 4135 9044 

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

$$

Uttech

851 
WWUS53 KDVN 160412
SVSDVN

Severe Weather Statement
National Weather Service Quad Cities IA/IL
1012 PM CST Wed Dec 15 2021

IAC045-097-163-ILC085-161-160420-
/O.EXP.KDVN.SV.W.0119.000000T0000Z-211216T0415Z/
Rock Island IL-Jo Daviess IL-Jackson IA-Scott IA-Clinton IA-
1012 PM CST Wed Dec 15 2021

...THE SEVERE THUNDERSTORM WARNING FOR EASTERN ROCK ISLAND...CENTRAL
JO DAVIESS...CENTRAL JACKSON...EASTERN SCOTT AND CLINTON COUNTIES
WILL EXPIRE AT 1015 PM CST...
    
The storms which prompted the warning have moved out of the area.
Therefore, the warning will be allowed to expire. Very strong winds 
are expected to continue behind the line of showers and 
thunderstorms.

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

LAT...LON 4219 9031 4212 9016 4190 9015 4175 9025
      4168 9023 4159 9017 4154 9020 4151 9035
      4146 9043 4133 9044 4133 9063 4229 9064
      4235 9059 4238 9053 4238 9048 4240 9050
      4251 9030
TIME...MOT...LOC 0410Z 253DEG 46KT 4247 9003 4139 9027 

$$

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, 8:06 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, 8:44 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, 9:14 PM CST	Severe Thunderstorm Warning Considerable damage threat	DVN	Henderson, McDonough, Mercer, Warren	61 min
Dec 15, 9:45 PM CST	Severe Thunderstorm Warning Considerable damage threat	DVN	Bureau, Carroll, Henry, Jo Daviess, Stephenson, Whiteside	60 min
Dec 15, 10:17 PM CST	Severe Thunderstorm Warning	DVN	Stephenson	31 min

Nearby

Severe Thunderstorm Warnings in Iowa, 2021 Severe Thunderstorm Warnings in Illinois, 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.