Alert archive / Iowa / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 114, NWS Quad Cities, IA
NWS Quad Cities, IA issued this severe thunderstorm warning at Dec 15, 2021, 8:23 PM CST for Benton County, Iowa County, Iowa. It was in force for 37 min. 4 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, 8:23 PM CST (02:23 UTC)
- Expired
- Dec 15, 2021, 9:00 PM CST
- In force
- 37 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 Benton County, IA, Iowa County, IA
The radar
The Quad Cities radar (KDVN), 124 km from the middle of the area, began a volume at 02:26 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, 8:24 PM CST | TSTM WND GST 65 | Norway, IA | REPORT RELAYED BY EM. |
| Dec 15, 8:26 PM CST | TSTM WND GST 70 | Norway, IA | REPORT RELAYED BY EM. |
| Dec 15, 8:30 PM CST | TSTM WND DMG | 1 Wsw Walford, IA | *** 1 FATAL *** SEVERE THUNDERSTORMS WINDS CAUSED A SEMI-TRAILER BLOW-OVER. THE DRIVER WAS THROWN FROM THE VEHICLE AND PRONOUNCED DEAD AT THE SCENE. |
| Dec 15, 8:32 PM CST | TSTM WND GST 65 | Atkins, 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, 2.4 hours before the alert went out and 130 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.
- 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
The text
As transmitted.
878
WUUS53 KDVN 160223
SVRDVN
IAC011-095-160300-
/O.NEW.KDVN.SV.W.0114.211216T0223Z-211216T0300Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Quad Cities IA/IL
823 PM CST Wed Dec 15 2021
The National Weather Service in the Quad Cities has issued a
* Severe Thunderstorm Warning for...
Eastern Benton County in east central Iowa...
Eastern Iowa County in east central Iowa...
* Until 900 PM CST.
* At 823 PM CST, severe thunderstorms were located along a line
extending from near Vinton to near Williamsburg, moving northeast
at 55 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...
Vinton, Marengo, Williamsburg, Atkins, Walford, Urbana, North
English, Shellsburg, Newhall, Blairstown, Van Horne, Norway,
Parnell, Amana, Conroy, Middle Amana, Vinton Memorial Airport,
Upper South Amana, East Amana and High Amana.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A Tornado Watch remains in effect until 1100 PM CST for southeastern,
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 southeastern,
northeastern and east central Iowa.
&&
LAT...LON 4230 9208 4230 9184 4151 9183 4151 9211
TIME...MOT...LOC 0223Z 244DEG 50KT 4209 9201 4163 9199
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
$$
McClure2 follow-up statements
951
WWUS53 KDVN 160234
SVSDVN
Severe Weather Statement
National Weather Service Quad Cities IA/IL
834 PM CST Wed Dec 15 2021
IAC011-095-160300-
/O.CON.KDVN.SV.W.0114.000000T0000Z-211216T0300Z/
Benton IA-Iowa IA-
834 PM CST Wed Dec 15 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 900 PM CST
FOR EASTERN BENTON AND EASTERN IOWA COUNTIES...
At 834 PM CST, severe thunderstorms were located along a line
extending from near Shellsburg to near Oxford, moving northeast at 60
mph.
HAZARD...70 mph wind gusts and penny size hail.
SOURCE...Trained weather spotters. A 65 mph wind gust was measured in
Atkins at 832 PM.
IMPACT...Expect considerable tree damage. Damage is likely to mobile
homes, roofs, and outbuildings.
Locations impacted include...
Vinton, Marengo, Williamsburg, Atkins, Walford, Urbana, North
English, Shellsburg, Newhall, Blairstown, Van Horne, Norway, Parnell,
Amana, Conroy, Middle Amana, Vinton Memorial Airport, Upper South
Amana, East Amana and High Amana.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A Tornado Watch remains in effect until 1100 PM CST for southeastern,
northeastern and east central Iowa.
For your protection move to an interior room on the lowest floor of a
sturdy building.
&&
LAT...LON 4230 9208 4230 9184 4151 9183 4151 9211
TIME...MOT...LOC 0234Z 244DEG 50KT 4215 9185 4169 9183
TORNADO...POSSIBLE
THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...70 MPH
$$
McClure637
WWUS53 KDVN 160254
SVSDVN
Severe Weather Statement
National Weather Service Quad Cities IA/IL
854 PM CST Wed Dec 15 2021
IAC011-095-160304-
/O.EXP.KDVN.SV.W.0114.000000T0000Z-211216T0300Z/
Benton IA-Iowa IA-
854 PM CST Wed Dec 15 2021
...THE SEVERE THUNDERSTORM WARNING FOR EASTERN BENTON AND EASTERN
IOWA COUNTIES WILL EXPIRE AT 900 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 southeastern,
northeastern and east central Iowa.
LAT...LON 4230 9208 4230 9184 4151 9183 4151 9211
TIME...MOT...LOC 0254Z 270DEG 50KT 4227 9153 4181 9151
$$
McClureThe 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 | DVN | Benton, Iowa | 58 min |
| Dec 15, 7:31 PM CST | Severe Thunderstorm Warning | DVN | Jefferson, Keokuk, Van Buren | 59 min |
| Dec 15, 7:33 PM CST | Severe Thunderstorm Warning | 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 | DVN | Buchanan, Delaware, Johnson, Linn, Louisa, Washington | 67 min |
| Dec 15, 8:18 PM CST | Severe Thunderstorm Warning | DVN | Henry, Jefferson, Lee, Van Buren | 57 min |
| Dec 15, 8:34 PM CST | Severe Thunderstorm Warning | DVN | Jefferson, Keokuk, Van Buren | 26 min |
| Dec 15, 8:44 PM CST | Severe Thunderstorm Warning | DVN | Delaware, Dubuque, Jones | 61 min |
| Dec 15, 8:50 PM CST | Severe Thunderstorm Warning | DVN | Cedar, Louisa, Muscatine | 55 min |
| Dec 15, 8:53 PM CST | Severe Thunderstorm Warning | DVN | Des Moines, Lee | 67 min |
| Dec 15, 9:12 PM CST | Severe Thunderstorm Warning | DVN | Clinton, Dubuque, Jackson, Scott | 63 min |
Nearby
Severe Thunderstorm Warnings in Iowa, 2021Every 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.