Alert archive / Iowa / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 110, 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, 7:31 PM CST for Jefferson County, Keokuk County, Van Buren County, Iowa; Scotland County, Missouri. It was in force for 59 min. 1 report 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, 7:31 PM CST (01:31 UTC)
Expired: Dec 15, 2021, 8:30 PM CST
In force: 59 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 Jefferson County, IA, Keokuk County, IA, Van Buren County, IA, Scotland County, MO

The radar

The Des Moines radar (KDMX), 150 km from the middle of the area, began a volume at 01:34 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, 8:20 PM CST	TSTM WND DMG	3 W Mount Sterling, IA	CORRECTS TIME OF PREVIOUS TSTM WND DMG REPORT FROM 3 W MOUNT STERLING. SEVERAL 3-4 INCH DIAMETER BRANCHES DOWN.

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, 1.5 hours before the alert went out and 163 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.

698 
WUUS53 KDVN 160131
SVRDVN
IAC101-107-177-MOC199-160230-
/O.NEW.KDVN.SV.W.0110.211216T0131Z-211216T0230Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Quad Cities IA/IL
731 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...
  Keokuk County in southeastern Iowa...
  Western Jefferson County in southeastern Iowa...
  Scotland County in northeastern Missouri...

* Until 830 PM CST.

* At 730 PM CST, severe thunderstorms were located along a line
  extending from near Oskaloosa to 11 miles southeast of Centerville,
  moving east at 40 mph.

  HAZARD...70 mph wind gusts and penny size hail.

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Fairfield, Sigourney, Memphis, Keosauqua, Hedrick, What Cheer,
  Richland, Batavia, Birmingham, Milton, Delta, Libertyville,
  Maharishi Vedic City, Keswick, Cantril, South English, Packwood,
  Harper, Martinsburg and Rutledge.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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

This is a DANGEROUS SITUATION. These storms are producing widespread
wind damage. SEEK SHELTER NOW inside a sturdy structure and stay 
away from windows!
 
Intense thunderstorm lines can produce brief tornadoes and widespread
significant wind damage. Although a tornado is not immediately
likely, it is best to move to an interior room on the lowest floor of
a building. These storms may cause serious injury and significant
property damage.

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

&&

LAT...LON 4151 9241 4151 9195 4030 9195 4030 9235
      4059 9235 4060 9218 4115 9218 4116 9241
TIME...MOT...LOC 0130Z 269DEG 34KT 4126 9268 4059 9275 

TORNADO...POSSIBLE
THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...70 MPH

$$

McClure

3 follow-up statements

316 
WWUS53 KDVN 160139
SVSDVN

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

IAC101-107-177-MOC199-160230-
/O.CON.KDVN.SV.W.0110.000000T0000Z-211216T0230Z/
Van Buren IA-Keokuk IA-Jefferson IA-Scotland MO-
739 PM CST Wed Dec 15 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 830 PM CST
FOR WESTERN VAN BUREN...KEOKUK...WESTERN JEFFERSON AND SCOTLAND
COUNTIES...

At 738 PM CST, severe thunderstorms were located along a line
extending from near Oskaloosa to 7 miles northwest of Lancaster,
moving east at 40 mph.

HAZARD...70 mph wind gusts and penny size hail.

SOURCE...Radar indicated.

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

Locations impacted include...
Fairfield, Sigourney, Memphis, Keosauqua, Hedrick, What Cheer,
Richland, Batavia, Birmingham, Milton, Delta, Libertyville, Maharishi
Vedic City, Keswick, Cantril, South English, Packwood, Harper,
Martinsburg and Rutledge.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

This is a DANGEROUS SITUATION. These storms are producing widespread
wind damage. SEEK SHELTER NOW inside a sturdy structure and stay away
from windows.
 
Intense thunderstorm lines can produce brief tornadoes and widespread
significant wind damage. Although a tornado is not immediately
likely, it is best to move to an interior room on the lowest floor of
a building. These storms may cause serious injury and significant
property damage.

&&

LAT...LON 4151 9241 4151 9195 4030 9195 4030 9235
      4059 9235 4060 9218 4115 9218 4116 9241
TIME...MOT...LOC 0138Z 270DEG 34KT 4126 9258 4059 9265 

TORNADO...POSSIBLE
THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...70 MPH

$$

McClure

579 
WWUS53 KDVN 160152
SVSDVN

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

IAC101-107-177-MOC199-160230-
/O.CON.KDVN.SV.W.0110.000000T0000Z-211216T0230Z/
Van Buren IA-Keokuk IA-Jefferson IA-Scotland MO-
752 PM CST Wed Dec 15 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 830 PM CST
FOR WESTERN VAN BUREN...KEOKUK...WESTERN JEFFERSON AND SCOTLAND
COUNTIES...

At 751 PM CST, severe thunderstorms were located along a line
extending from 6 miles southwest of Delta to near Lancaster, moving
east at 40 mph.

HAZARD...70 mph wind gusts and penny size hail.

SOURCE...Radar indicated.

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

Locations impacted include...
Fairfield, Sigourney, Memphis, Keosauqua, Hedrick, What Cheer,
Richland, Batavia, Birmingham, Milton, Delta, Libertyville, Maharishi
Vedic City, Keswick, Cantril, South English, Packwood, Harper,
Martinsburg and Rutledge.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

This is a DANGEROUS SITUATION. These storms are producing widespread
wind damage. SEEK SHELTER NOW inside a sturdy structure and stay away
from windows.
 
&&

LAT...LON 4151 9241 4151 9195 4030 9195 4030 9235
      4059 9235 4060 9218 4115 9218 4116 9241
TIME...MOT...LOC 0151Z 269DEG 34KT 4126 9241 4059 9249 

TORNADO...POSSIBLE
THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...70 MPH

$$

McClure

383 
WWUS53 KDVN 160200
SVSDVN

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

IAC101-107-177-MOC199-160230-
/O.CON.KDVN.SV.W.0110.000000T0000Z-211216T0230Z/
Van Buren IA-Keokuk IA-Jefferson IA-Scotland MO-
800 PM CST Wed Dec 15 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 830 PM CST
FOR WESTERN VAN BUREN...KEOKUK...WESTERN JEFFERSON AND SCOTLAND
COUNTIES...

At 759 PM CST, severe thunderstorms were located along a line
extending from near Hayesville to 7 miles north of Downing, moving
east at 40 mph.

HAZARD...70 mph wind gusts and penny size hail.

SOURCE...Trained weather spotters. A gust of 82 mph was measured by the
         automated equipment at the Ottumwa airport at 754 pm.   

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

Locations impacted include...
Fairfield, Sigourney, Memphis, Keosauqua, Hedrick, What Cheer,
Richland, Batavia, Birmingham, Milton, Delta, Libertyville, Maharishi
Vedic City, Keswick, Cantril, South English, Packwood, Harper,
Martinsburg and Rutledge.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

This is a DANGEROUS SITUATION. These storms are producing widespread
wind damage. SEEK SHELTER NOW inside a
sturdy structure and stay away from windows.
 
&&

LAT...LON 4151 9241 4151 9195 4030 9195 4030 9235
      4059 9235 4060 9218 4115 9218 4116 9241
TIME...MOT...LOC 0159Z 269DEG 34KT 4126 9231 4059 9239 

TORNADO...POSSIBLE
THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.75 IN
WIND THREAT...OBSERVED
MAX WIND GUST...70 MPH

$$

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, 7:33 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, 9:12 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.