Alert archive / Iowa / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 118, NWS Quad Cities, IA

December 15, 2021Des Moines County, Lee County, Iowa; Hancock County, Henderson County, Illinois

NWS Quad Cities, IA issued this severe thunderstorm warning at Dec 15, 2021, 8:53 PM CST for Des Moines County, Lee County, Iowa; Hancock County, Henderson County, Illinois. It was in force for 67 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, 8:53 PM CST (02:53 UTC)
Expired: Dec 15, 2021, 10:00 PM CST
In force: 67 min
Issued by: NWS Quad Cities, IA
Area: Storm-based polygon
Tornado: Possible
Damage threat: Considerable
Hail: 0.75 in
Wind: 70.0 mph

Counties Des Moines County, IA, Lee County, IA, Hancock County, IL, Henderson County, IL

The radar

The Quad Cities radar (KDVN), 132 km from the middle of the area, began a volume at 02:57 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, 9:19 PM CST	TSTM WND DMG	2 Nne Dodgeville, IA	TREE DOWN ON POWER LINES. TIME ESTIMATED BY RADAR.
Dec 15, 9:22 PM CST	TSTM WND DMG	2 Sw West Burlington, IA	SHED BLOWN DOWN AND SKIRTING BLOWN OFF A MOBILE HOME.

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, 2.9 hours before the alert went out and 136 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.

327 
WUUS53 KDVN 160253
SVRDVN
ILC067-071-IAC057-111-160400-
/O.NEW.KDVN.SV.W.0118.211216T0253Z-211216T0400Z/

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

The National Weather Service in the Quad Cities has issued a

* Severe Thunderstorm Warning for...
  Hancock County in west central Illinois...
  Western Henderson County in west central Illinois...
  Des Moines County in southeastern Iowa...
  Eastern Lee County in southeastern Iowa...

* Until 1000 PM CST.

* At 853 PM CST, severe thunderstorms were located along a line
  extending from near Cotter to 9 miles southwest of Wayland, 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...
  Burlington, Fort Madison, Keokuk, Carthage, Oquawka, Nauvoo, West
  Burlington, Hamilton, Warsaw, Mediapolis, La Harpe, Dallas City,
  Danville, Stronghurst, Bowen, Middletown, Carman, Gladstone, Terre
  Haute and West Point.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 1100 PM CST for west central
Illinois...southeastern Iowa...and northeastern Missouri.

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 west central
Illinois...southeastern Iowa...and northeastern Missouri.

&&

LAT...LON 4020 9151 4021 9151 4035 9146 4039 9138
      4052 9138 4055 9140 4058 9138 4080 9138
      4081 9141 4081 9137 4108 9137 4107 9094
      4064 9091 4020 9091
TIME...MOT...LOC 0253Z 265DEG 45KT 4126 9146 4027 9165 

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

4 follow-up statements

471 
WWUS53 KDVN 160309
SVSDVN

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

ILC067-071-IAC057-111-160400-
/O.CON.KDVN.SV.W.0118.000000T0000Z-211216T0400Z/
Hancock IL-Henderson IL-Des Moines IA-Lee IA-
909 PM CST Wed Dec 15 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1000 PM CST
FOR HANCOCK...WESTERN HENDERSON...DES MOINES AND EASTERN LEE
COUNTIES...

At 908 PM CST, severe thunderstorms were located along a line
extending from near Grandview to near Warsaw, moving east at 50 mph.

HAZARD...70 mph wind gusts. A 60 mph gust was recorded Mount Pleasant. 

SOURCE...Trained weather spotters. 

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

Locations impacted include...
Burlington, Fort Madison, Keokuk, Carthage, Oquawka, Nauvoo, West
Burlington, Hamilton, Warsaw, Mediapolis, La Harpe, Dallas City,
Danville, Stronghurst, Bowen, Middletown, Carman, Gladstone, Terre
Haute and West Point.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 1100 PM CST for west central
Illinois...southeastern Iowa...and northeastern Missouri.

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

&&

LAT...LON 4020 9151 4021 9151 4035 9146 4039 9138
      4052 9138 4055 9140 4058 9138 4080 9138
      4081 9141 4081 9137 4108 9137 4107 9094
      4064 9091 4020 9091
TIME...MOT...LOC 0308Z 265DEG 45KT 4127 9123 4029 9142 

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

$$

McClure

180 
WWUS53 KDVN 160321
SVSDVN

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

ILC067-071-IAC057-111-160400-
/O.CON.KDVN.SV.W.0118.000000T0000Z-211216T0400Z/
Hancock IL-Henderson IL-Des Moines IA-Lee IA-
921 PM CST Wed Dec 15 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1000 PM CST
FOR HANCOCK...WESTERN HENDERSON...DES MOINES AND EASTERN LEE
COUNTIES...

At 921 PM CST, severe thunderstorms were located along a line
extending from near Eliza to near West Point, moving east at 50 mph.

HAZARD...70 mph wind gusts.

SOURCE...Trained weather spotters. A 58 mph wind gust was measured at
         the Keokuk Airport at 906 PM.  

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

Locations impacted include...
Burlington, Fort Madison, Keokuk, Carthage, Oquawka, Nauvoo, West
Burlington, Hamilton, Warsaw, Mediapolis, La Harpe, Dallas City,
Danville, Stronghurst, Bowen, Middletown, Carman, Gladstone, Terre
Haute and West Point.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 1100 PM CST for west central
Illinois...southeastern Iowa...and northeastern Missouri.

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

&&

LAT...LON 4020 9151 4021 9151 4035 9146 4039 9138
      4052 9138 4055 9140 4058 9138 4080 9138
      4081 9141 4081 9137 4108 9137 4107 9094
      4064 9091 4020 9091
TIME...MOT...LOC 0321Z 265DEG 45KT 4128 9104 4030 9123 

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

$$

McClure

348 
WWUS53 KDVN 160341
SVSDVN

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

ILC071-IAC057-111-160351-
/O.CAN.KDVN.SV.W.0118.000000T0000Z-211216T0400Z/
Henderson IL-Des Moines IA-Lee IA-
941 PM CST Wed Dec 15 2021

...THE SEVERE THUNDERSTORM WARNING FOR WESTERN HENDERSON...DES MOINES
AND EASTERN LEE 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 west central
Illinois.

LAT...LON 4021 9110 4032 9105 4046 9105 4063 9102
      4064 9101 4064 9091 4020 9091
TIME...MOT...LOC 0341Z 310DEG 47KT 4067 9092 4019 9100 

$$

ILC067-160400-
/O.CON.KDVN.SV.W.0118.000000T0000Z-211216T0400Z/
Hancock IL-
941 PM CST Wed Dec 15 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1000 PM CST
FOR EASTERN HANCOCK COUNTY...

At 941 PM CST, severe thunderstorms were located along a line
extending from near Terre Haute to near Augusta, 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...
La Harpe, Augusta, Bowen, Disco, Plymouth, Fountain Green, Webster
and Hancock County Fairgrounds.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 1100 PM CST for west central
Illinois.

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

&&

LAT...LON 4021 9110 4032 9105 4046 9105 4063 9102
      4064 9101 4064 9091 4020 9091
TIME...MOT...LOC 0341Z 310DEG 47KT 4067 9092 4019 9100 

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

$$

McClure

880 
WWUS53 KDVN 160353
SVSDVN

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

ILC067-160403-
/O.EXP.KDVN.SV.W.0118.000000T0000Z-211216T0400Z/
Hancock IL-
953 PM CST Wed Dec 15 2021

...THE SEVERE THUNDERSTORM WARNING FOR EASTERN HANCOCK COUNTY WILL
EXPIRE AT 1000 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 west central
Illinois.

LAT...LON 4021 9110 4032 9105 4046 9105 4063 9102
      4064 9101 4064 9091 4020 9091
TIME...MOT...LOC 0353Z 265DEG 45KT 4068 9074 4020 9082 

$$

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, 8:44 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, 9:12 PM CST	Severe Thunderstorm Warning Considerable damage threat	DVN	Clinton, Dubuque, Jackson, Scott	63 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.