Alert archive / Iowa / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 117, NWS Quad Cities, IA

December 15, 2021Cedar County, Louisa County, Muscatine County, Iowa

NWS Quad Cities, IA issued this severe thunderstorm warning at Dec 15, 2021, 8:50 PM CST for Cedar County, Louisa County, Muscatine County, Iowa. It was in force for 55 min. 6 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, 8:50 PM CST (02:50 UTC)
Expired: Dec 15, 2021, 9:45 PM CST
In force: 55 min
Issued by: NWS Quad Cities, IA
Area: Storm-based polygon
Damage threat: Considerable
Hail: 0.75 in
Wind: 70.0 mph

Counties Cedar County, IA, Louisa County, IA, Muscatine County, IA

The radar

The Quad Cities radar (KDVN), 50 km from the middle of the area, began a volume at 02:51 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, 9:13 PM CST	TSTM WND DMG	2 S Fruitland, IA	PART OF A BUILDING BLOWN INTO THE ROADWAY.
Dec 15, 9:24 PM CST	TSTM WND DMG	3 Ne Muscatine, IA	POWER POLES BROKEN.
Dec 15, 9:25 PM CST	TSTM WND GST 70	Lowden, IA
Dec 15, 9:27 PM CST	TSTM WND GST 60	4 Nne Muscatine, IA
Dec 15, 9:30 PM CST	TSTM WND DMG	3 Ese Cotter, IA	TREE DOWN ON ROADWAY ABOUT 3 W COLUMBUS JUNCTION.
Dec 15, 9:30 PM CST	TSTM WND DMG	3 Ese Cotter, IA	TREE DOWN ON ROADWAY ABOUT 3 W OF COLUMBUS JUNCTION.

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, 2.8 hours before the alert went out and 57 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.

878 
WUUS53 KDVN 160250
SVRDVN
IAC031-115-139-160345-
/O.NEW.KDVN.SV.W.0117.211216T0250Z-211216T0345Z/

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

The National Weather Service in the Quad Cities has issued a

* Severe Thunderstorm Warning for...
  Louisa County in southeastern Iowa...
  Cedar County in east central Iowa...
  Muscatine County in east central Iowa...

* Until 945 PM CST.

* At 850 PM CST, severe thunderstorms were located along a line
  extending from near Morley to near Mount Pleasant, moving northeast
  at 65 mph.

  HAZARD...70 mph wind gusts.

  SOURCE...Trained weather spotters.

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

* Severe thunderstorms will be near...
  Morning Sun around 905 PM CST.
  Amber around 910 PM CST.

Other locations in the path of these severe thunderstorms include
Oakville, Toolesboro and New Boston.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4142 9147 4142 9137 4195 9136 4194 9090
      4160 9090 4159 9078 4145 9079 4145 9085
      4142 9093 4143 9098 4142 9103 4125 9111
      4117 9104 4116 9099 4107 9095 4108 9137
      4116 9137 4116 9147
TIME...MOT...LOC 0250Z 238DEG 56KT 4199 9128 4089 9150 

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

$$

Uttech

3 follow-up statements

878 
WWUS53 KDVN 160303 RRA
SVSDVN

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

IAC031-115-139-160345-
/O.CON.KDVN.SV.W.0117.000000T0000Z-211216T0345Z/
Louisa IA-Cedar IA-Muscatine IA-
903 PM CST Wed Dec 15 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 945 PM CST
FOR LOUISA...CEDAR AND MUSCATINE COUNTIES...

At 903 PM CST, severe thunderstorms were located along a line
extending from near Olin to near Mount Union, moving northeast 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...
  Amber, Oakville, Toolesboro and New Boston.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4142 9147 4142 9137 4195 9136 4194 9090
      4160 9090 4159 9078 4145 9079 4145 9085
      4142 9093 4143 9098 4142 9103 4125 9111
      4117 9104 4116 9099 4107 9095 4108 9137
      4116 9137 4116 9147
TIME...MOT...LOC 0303Z 244DEG 48KT 4197 9115 4100 9137 

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

$$

Uttech

517 
WWUS53 KDVN 160316
SVSDVN

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

IAC031-115-139-160345-
/O.CON.KDVN.SV.W.0117.000000T0000Z-211216T0345Z/
Louisa IA-Cedar IA-Muscatine IA-
916 PM CST Wed Dec 15 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 945 PM CST
FOR LOUISA...CEDAR AND MUSCATINE COUNTIES...

At 915 PM CST, severe thunderstorms were located along a line
extending from Wyoming to Mediapolis, moving east at 60 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...
Muscatine, Tipton, West Branch, Wapello, Columbus Junction, Durant,
Mechanicsville, Stanwood, West Liberty, Wilton, Walcott, Fruitland,
Morning Sun, Lowden, New Boston, Grandview, Conesville, Bennett,
Columbus City and Letts.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4142 9147 4142 9137 4195 9136 4194 9090
      4160 9090 4159 9078 4145 9079 4145 9085
      4142 9093 4143 9098 4142 9103 4125 9111
      4117 9104 4116 9099 4107 9095 4108 9137
      4116 9137 4116 9147
TIME...MOT...LOC 0315Z 261DEG 51KT 4207 9101 4101 9118 

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

$$

Uttech

494 
WWUS53 KDVN 160340
SVSDVN

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

IAC031-115-139-160349-
/O.EXP.KDVN.SV.W.0117.000000T0000Z-211216T0345Z/
Louisa IA-Cedar IA-Muscatine IA-
940 PM CST Wed Dec 15 2021

...THE SEVERE THUNDERSTORM WARNING FOR LOUISA...CEDAR AND MUSCATINE
COUNTIES WILL EXPIRE AT 945 PM CST...

The storms which prompted the warning have moved out of the warned 
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 southeastern and east central Iowa.

LAT...LON 4142 9147 4142 9137 4195 9136 4194 9090
      4160 9090 4159 9078 4145 9079 4145 9085
      4142 9093 4143 9098 4142 9103 4125 9111
      4117 9104 4116 9099 4107 9095 4108 9137
      4116 9137 4116 9147
TIME...MOT...LOC 0339Z 238DEG 56KT 4226 9060 4120 9077 

$$

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, 8:53 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.