Alert archive / Iowa / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 108, NWS Quad Cities, IA
NWS Quad Cities, IA issued this severe thunderstorm warning at Sep 20, 2021, 7:13 PM CDT for 4 counties in Iowa. It was in force for 47 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
- Sep 20, 2021, 7:13 PM CDT (00:13 UTC)
- Expired
- Sep 20, 2021, 8:00 PM CDT
- In force
- 47 min
- Issued by
- NWS Quad Cities, IA
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties Henry County, IA, Jefferson County, IA, Keokuk County, IA, Washington County, IA
The radar
The Quad Cities radar (KDVN), 125 km from the middle of the area, began a volume at 00:17 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 |
|---|---|---|---|
| Sep 20, 7:14 PM CDT | TSTM WND DMG | 1 Ssw Beckwith, IA | AMATEUR RADIO REPORT VIA THE NWS IN DES MOINES OF TREE DAMAGE ALONG HIGHWAY 34 EAST OF FAIRFIELD. TIME OF THE EVENT ESTIMATED USING RADAR. |
| Sep 20, 7:15 PM CDT | TSTM WND DMG | 1 Ne Batavia, IA | CORRECTS PREVIOUS TSTM WND DMG REPORT FROM BATAVIA. TREE DOWN ON ROAD AND POWERLINES DOWN. LOCATION OF DAMAGE WAS NEAR GAS STATION ON NE SIDE OF TOWN NEAR US 34. |
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 |
|---|---|---|---|
| Sep 20, 2:07 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
The nearest sounding before it
Davenport, (KDVN), launched 00:00Z, 0.2 hours before the alert went out and 131 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
- 1090 J/kg
- Mixed-layer CIN
- -6 J/kg
- Mixed-layer LCL
- 1240 m above ground
- 0-6 km bulk shear
- 24 kt
- 0-1 km storm-relative helicity
- 139 m²/s²
- 0-3 km storm-relative helicity
- 217 m²/s²
- Significant tornado parameter
- 0.5
- Supercell composite
- 3.7
The text
As transmitted.
782
WUUS53 KDVN 210013
SVRDVN
IAC087-101-107-183-210100-
/O.NEW.KDVN.SV.W.0108.210921T0013Z-210921T0100Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Quad Cities IA/IL
713 PM CDT Mon Sep 20 2021
The National Weather Service in the Quad Cities has issued a
* Severe Thunderstorm Warning for...
Northwestern Henry County in southeastern Iowa...
Southeastern Keokuk County in southeastern Iowa...
Southern Washington County in southeastern Iowa...
Jefferson County in southeastern Iowa...
* Until 800 PM CDT.
* At 713 PM CDT, a severe thunderstorm was located over Maharishi
Vedic City, or near Fairfield, moving northeast at 40 mph.
HAZARD...60 mph wind gusts and penny size hail.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
* This severe thunderstorm will be near...
Pleasant Plain around 725 PM CDT.
Brighton around 730 PM CDT.
Other locations in the path of this severe thunderstorm include
Coppock, Wayland, Washington, Crawfordsville and Ainsworth.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
sturdy building.
To report severe weather, contact your nearest law enforcement
agency. They will send your report to the National Weather Service
office in the Quad Cities.
Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 4111 9216 4139 9150 4104 9147 4090 9191
4090 9217
TIME...MOT...LOC 0013Z 237DEG 35KT 4107 9199
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
McClure5 follow-up statements
862
WWUS53 KDVN 210022
SVSDVN
Severe Weather Statement
National Weather Service Quad Cities IA/IL
722 PM CDT Mon Sep 20 2021
IAC087-101-107-183-210100-
/O.CON.KDVN.SV.W.0108.000000T0000Z-210921T0100Z/
Henry IA-Keokuk IA-Washington IA-Jefferson IA-
722 PM CDT Mon Sep 20 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 800 PM CDT
FOR NORTHWESTERN HENRY...SOUTHEASTERN KEOKUK...SOUTHERN WASHINGTON
AND JEFFERSON COUNTIES...
At 721 PM CDT, a severe thunderstorm was located near Pleasant Plain,
or near Fairfield, moving northeast at 40 mph.
HAZARD...60 mph wind gusts and penny size hail.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
This severe storm will be near...
Pleasant Plain around 730 PM CDT.
Other locations in the path of this severe thunderstorm include
Brighton, Coppock, Wayland, Washington, Olds, Crawfordsville and
Ainsworth.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
To report severe weather contact your nearest law enforcement agency.
They will send your report to the National Weather Service office in
the Quad Cities.
Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 4111 9216 4139 9150 4104 9147 4090 9191
4090 9217
TIME...MOT...LOC 0021Z 238DEG 33KT 4109 9192
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
McClure662
WWUS53 KDVN 210029
SVSDVN
Severe Weather Statement
National Weather Service Quad Cities IA/IL
729 PM CDT Mon Sep 20 2021
IAC087-101-107-183-210100-
/O.CON.KDVN.SV.W.0108.000000T0000Z-210921T0100Z/
Henry IA-Keokuk IA-Washington IA-Jefferson IA-
729 PM CDT Mon Sep 20 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 800 PM CDT
FOR NORTHWESTERN HENRY...SOUTHEASTERN KEOKUK...SOUTHERN WASHINGTON
AND JEFFERSON COUNTIES...
At 729 PM CDT, a severe thunderstorm was located over Pleasant Plain,
or 8 miles northeast of Fairfield, moving northeast at 40 mph.
HAZARD...70 mph wind gusts and penny size hail.
SOURCE...Trained weather spotters.
IMPACT...Expect considerable tree damage. Damage is likely to mobile
homes, roofs, and outbuildings.
This severe storm will be near...
Brighton around 735 PM CDT.
Coppock around 740 PM CDT.
Other locations in the path of this severe thunderstorm include
Wayland, Washington, Olds, Crawfordsville and Ainsworth.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
sturdy building.
To report severe weather contact your nearest law enforcement agency.
They will send your report to the National Weather Service office in
the Quad Cities.
Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 4113 9211 4139 9150 4104 9147 4090 9191
4090 9206
TIME...MOT...LOC 0029Z 237DEG 35KT 4111 9188
THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...70 MPH
$$
McClure234
WWUS53 KDVN 210037
SVSDVN
Severe Weather Statement
National Weather Service Quad Cities IA/IL
737 PM CDT Mon Sep 20 2021
IAC087-101-107-183-210100-
/O.CON.KDVN.SV.W.0108.000000T0000Z-210921T0100Z/
Henry IA-Keokuk IA-Washington IA-Jefferson IA-
737 PM CDT Mon Sep 20 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 800 PM CDT
FOR NORTHWESTERN HENRY...SOUTHEASTERN KEOKUK...SOUTHERN WASHINGTON
AND EASTERN JEFFERSON COUNTIES...
At 737 PM CDT, a severe thunderstorm was located over Brighton, or 11
miles southwest of Washington, moving northeast at 40 mph.
HAZARD...60 mph wind gusts and penny size hail.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
Locations impacted include...
Fairfield, Washington, Wayland, Brighton, Ainsworth, Lockridge,
Crawfordsville, Olds, Rome, Pleasant Plain, Coppock, Washington
Airport, Germanville, Haskins, Lake Darling State Park, Swedesburg,
Noble, Perlee, East Pleasant Plain and Marr Park.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
sturdy building.
To report severe weather contact your nearest law enforcement agency.
They will send your report to the National Weather Service office in
the Quad Cities.
Continuous cloud to ground lightning is occurring with this storm.
Move indoors immediately. Lightning is one of nature's leading
killers. Remember, if you can hear thunder, you are close enough to
be struck by lightning.
Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 4118 9199 4139 9150 4104 9147 4090 9191
4105 9195
TIME...MOT...LOC 0037Z 237DEG 35KT 4115 9179
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
McClure410
WWUS53 KDVN 210042
SVSDVN
Severe Weather Statement
National Weather Service Quad Cities IA/IL
742 PM CDT Mon Sep 20 2021
IAC107-210051-
/O.CAN.KDVN.SV.W.0108.000000T0000Z-210921T0100Z/
Keokuk IA-
742 PM CDT Mon Sep 20 2021
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN KEOKUK COUNTY IS
CANCELLED...
The severe thunderstorm which prompted the warning has moved out of
the warned area. Therefore, the warning has been cancelled.
A Severe Thunderstorm Watch remains in effect until 1000 PM CDT for
southeastern Iowa.
LAT...LON 4121 9191 4139 9150 4104 9147 4092 9185
4107 9188
TIME...MOT...LOC 0041Z 237DEG 35KT 4118 9174
$$
IAC087-101-183-210100-
/O.CON.KDVN.SV.W.0108.000000T0000Z-210921T0100Z/
Henry IA-Washington IA-Jefferson IA-
742 PM CDT Mon Sep 20 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 800 PM CDT
FOR NORTHWESTERN HENRY...SOUTHERN WASHINGTON AND EASTERN JEFFERSON
COUNTIES...
At 741 PM CDT, a severe thunderstorm was located over Coppock, or 8
miles south of Washington, moving northeast at 40 mph.
HAZARD...60 mph wind gusts and penny size hail.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
Locations impacted include...
Washington, Wayland, Brighton, Ainsworth, Lockridge, Crawfordsville,
Olds, Rome, Pleasant Plain, Coppock, Noble, Washington Airport, East
Pleasant Plain, Marr Park, Merrimac, Germanville, Haskins, Mac Coon
Access, Salina and Lake Darling State Park.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
sturdy building.
To report severe weather contact your nearest law enforcement agency.
They will send your report to the National Weather Service office in
the Quad Cities.
Continuous cloud to ground lightning is occurring with this storm.
Move indoors immediately. Lightning is one of nature's leading
killers. Remember, if you can hear thunder, you are close enough to
be struck by lightning.
Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 4121 9191 4139 9150 4104 9147 4092 9185
4107 9188
TIME...MOT...LOC 0041Z 237DEG 35KT 4118 9174
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
McClure676
WWUS53 KDVN 210050
SVSDVN
Severe Weather Statement
National Weather Service Quad Cities IA/IL
750 PM CDT Mon Sep 20 2021
IAC087-101-183-210100-
/O.EXP.KDVN.SV.W.0108.000000T0000Z-210921T0100Z/
Henry IA-Washington IA-Jefferson IA-
750 PM CDT Mon Sep 20 2021
...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN HENRY...SOUTHERN
WASHINGTON AND EASTERN JEFFERSON COUNTIES WILL EXPIRE AT 800 PM
CDT...
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning will be allowed to expire. However gusty
winds and heavy rain are still possible with this thunderstorm.
A Severe Thunderstorm Watch remains in effect until 1000 PM CDT for
southeastern Iowa.
LAT...LON 4121 9191 4139 9150 4104 9147 4092 9185
4107 9188
TIME...MOT...LOC 0050Z 237DEG 35KT 4122 9166
$$
McClureThe office that day
Everything else NWS Quad Cities, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 20, 7:53 PM CDT | Special Weather Statement | DVN | Louisa | 52 min |
| Sep 20, 8:52 PM CDT | Special Weather Statement | DVN | Scott | 23 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.