Alert archive / Iowa / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 115, NWS Quad Cities, IA

December 15, 2021Jefferson County, Keokuk County, Van Buren County, Iowa; Scotland County, Missouri

NWS Quad Cities, IA issued this severe thunderstorm warning at Dec 15, 2021, 8:34 PM CST for Jefferson County, Keokuk County, Van Buren County, Iowa; Scotland County, Missouri. It was in force for 26 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Dec 15, 2021, 8:34 PM CST (02:34 UTC)
Expired: Dec 15, 2021, 9:00 PM CST
In force: 26 min
Issued by: NWS Quad Cities, IA
Area: Storm-based polygon
Damage threat: Considerable
Hail: 0.75 in
Wind: 70.0 mph

Counties Jefferson County, IA, Keokuk County, IA, Van Buren County, IA, Scotland County, MO

The radar

The Quad Cities radar (KDVN), 158 km from the middle of the area, began a volume at 02:38 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.

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, 2.6 hours before the alert went out and 164 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.

421 
WUUS53 KDVN 160234
SVRDVN
IAC101-107-177-MOC199-160300-
/O.NEW.KDVN.SV.W.0115.211216T0234Z-211216T0300Z/

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

The National Weather Service in the Quad Cities has issued a

* Severe Thunderstorm Warning for...
  Western Van Buren County in southeastern Iowa...
  Eastern Keokuk County in southeastern Iowa...
  Western Jefferson County in southeastern Iowa...
  Scotland County in northeastern Missouri...

* Until 900 PM CST.

* At 833 PM CST, severe thunderstorms were located along a line
  extending from near Kinross to Memphis, 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...
  Kinross around 840 PM CST.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4060 9233 4060 9218 4116 9218 4116 9221
      4151 9213 4151 9195 4030 9195 4030 9235
TIME...MOT...LOC 0233Z 246DEG 46KT 4151 9199 4046 9217 

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

$$

Uttech

2 follow-up statements

779 
WWUS53 KDVN 160244
SVSDVN

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

IAC101-107-177-MOC199-160300-
/O.CON.KDVN.SV.W.0115.000000T0000Z-211216T0300Z/
Van Buren IA-Keokuk IA-Jefferson IA-Scotland MO-
844 PM CST Wed Dec 15 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 900 PM CST
FOR WESTERN VAN BUREN...EASTERN KEOKUK...WESTERN JEFFERSON AND
SCOTLAND COUNTIES...

At 844 PM CST, severe thunderstorms were located along a line
extending from near Kinross to near Memphis, 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.

These severe storms will be near...
  Kinross around 850 PM CST.

Other locations in the path of these severe thunderstorms include
Cantril and Granger.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4060 9233 4060 9218 4116 9218 4116 9221
      4151 9213 4151 9195 4030 9195 4030 9235
TIME...MOT...LOC 0244Z 240DEG 47KT 4150 9199 4048 9220 

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

$$

Uttech

284 
WWUS53 KDVN 160303
SVSDVN

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

IAC101-107-177-MOC199-160311-
/O.EXP.KDVN.SV.W.0115.000000T0000Z-211216T0300Z/
Van Buren IA-Keokuk IA-Jefferson IA-Scotland MO-
903 PM CST Wed Dec 15 2021

...THE SEVERE THUNDERSTORM WARNING FOR WESTERN VAN BUREN...EASTERN
KEOKUK...WESTERN JEFFERSON AND SCOTLAND COUNTIES HAS EXPIRED...
    
The storms which prompted the warning have moved out of the area.
Therefore, the warning has been allowed to expire.

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

LAT...LON 4060 9233 4060 9218 4116 9218 4116 9221
      4151 9213 4151 9195 4030 9195 4030 9235
TIME...MOT...LOC 0301Z 246DEG 46KT 4159 9173 4057 9194 

$$

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, 8:44 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

Severe Thunderstorm Warnings in Iowa, 2021 Severe Thunderstorm Warnings in Missouri, 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.