Alert archive / Iowa / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 107, NWS Quad Cities, IA
NWS Quad Cities, IA issued this severe thunderstorm warning at Sep 20, 2021, 6:52 PM CDT for Delaware County, Iowa. It was in force for 38 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
- Sep 20, 2021, 6:52 PM CDT (23:52 UTC)
- Expired
- Sep 20, 2021, 7:30 PM CDT
- In force
- 38 min
- Issued by
- NWS Quad Cities, IA
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
County Delaware County, IA
The radar
The Quad Cities radar (KDVN), 118 km from the middle of the area, began a volume at 23:51 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 |
|---|---|---|---|
| Sep 20, 7:10 PM CDT | HAIL 0.7 | Manchester, IA | NO HAIL NOTED. |
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 12:00Z, 11.9 hours before the alert went out and 121 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
- 450 J/kg
- Mixed-layer CIN
- -8 J/kg
- Mixed-layer LCL
- 567 m above ground
- 0-6 km bulk shear
- 8 kt
- 0-1 km storm-relative helicity
- -31 m²/s²
- 0-3 km storm-relative helicity
- -25 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
448
WUUS53 KDVN 202352
SVRDVN
IAC055-210030-
/O.NEW.KDVN.SV.W.0107.210920T2352Z-210921T0030Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Quad Cities IA/IL
652 PM CDT Mon Sep 20 2021
The National Weather Service in the Quad Cities has issued a
* Severe Thunderstorm Warning for...
Western Delaware County in northeastern Iowa...
* Until 730 PM CDT.
* At 652 PM CDT, a severe thunderstorm was located near Masonville,
or near Manchester, moving northeast at 45 mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Radar indicated.
IMPACT...Hail damage to vehicles is expected. Expect wind damage
to roofs, siding, and trees.
* This severe thunderstorm will be near...
Manchester and Dundee around 700 PM CDT.
Delhi, Delaware and Oneida around 705 PM CDT.
Edgewood, Earlville and Greeley around 710 PM CDT.
Other locations in the path of this severe thunderstorm include
Colesburg.
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.
&&
LAT...LON 4235 9136 4240 9160 4264 9160 4265 9113
TIME...MOT...LOC 2352Z 235DEG 41KT 4244 9154
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
McClure3 follow-up statements
300
WWUS53 KDVN 202359
SVSDVN
Severe Weather Statement
National Weather Service Quad Cities IA/IL
659 PM CDT Mon Sep 20 2021
IAC055-210030-
/O.CON.KDVN.SV.W.0107.000000T0000Z-210921T0030Z/
Delaware IA-
659 PM CDT Mon Sep 20 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 730 PM CDT
FOR WESTERN DELAWARE COUNTY...
At 658 PM CDT, a severe thunderstorm was located over Manchester,
moving northeast at 45 mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Radar indicated.
IMPACT...Hail damage to vehicles is expected. Expect wind damage to
roofs, siding, and trees.
This severe storm will be near...
Oneida around 705 PM CDT.
Edgewood, Earlville and Greeley around 710 PM CDT.
Colesburg around 720 PM CDT.
Other locations impacted by this severe thunderstorm include Coffins
Grove Park, Twin Bridges Park, Baileys Ford Park, Petersburg,
Backbone State Park, Delaware County Fairgrounds, Manchester Airport,
Oneida and Turtle Creek Park.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
To report severe weather contact your nearest law enforcement agency.
They will send your report to the National Weather Service office in
the Quad Cities.
Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 4235 9136 4240 9160 4264 9160 4265 9113
TIME...MOT...LOC 2358Z 235DEG 41KT 4248 9146
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
McClure389 WWUS53 KDVN 210014 SVSDVN Severe Weather Statement National Weather Service Quad Cities IA/IL 714 PM CDT Mon Sep 20 2021 IAC055-210030- /O.CON.KDVN.SV.W.0107.000000T0000Z-210921T0030Z/ Delaware IA- 714 PM CDT Mon Sep 20 2021 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 730 PM CDT FOR DELAWARE COUNTY... At 714 PM CDT, a severe thunderstorm was located near Greeley, or 12 miles northeast of Manchester, moving northeast at 45 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 remain over mainly rural areas of Delaware County, including the following locations... Coffins Grove Park, Twin Bridges Park, Baileys Ford Park, Petersburg, Backbone State Park, Delaware County Fairgrounds, Manchester Airport, Oneida and Turtle Creek Park. 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 4235 9136 4242 9160 4264 9160 4265 9113 TIME...MOT...LOC 0014Z 235DEG 41KT 4259 9126 HAIL THREAT...RADAR INDICATED MAX HAIL SIZE...0.75 IN WIND THREAT...RADAR INDICATED MAX WIND GUST...60 MPH $$ McClure
430
WWUS53 KDVN 210020
SVSDVN
Severe Weather Statement
National Weather Service Quad Cities IA/IL
720 PM CDT Mon Sep 20 2021
IAC055-210030-
/O.EXP.KDVN.SV.W.0107.000000T0000Z-210921T0030Z/
Delaware IA-
720 PM CDT Mon Sep 20 2021
...THE SEVERE THUNDERSTORM WARNING FOR DELAWARE COUNTY WILL EXPIRE AT
730 PM CDT...
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning will be allowed to expire. However small hail
and gusty winds are still possible with this thunderstorm.
A Severe Thunderstorm Watch remains in effect until 1000 PM CDT for
northeastern Iowa.
LAT...LON 4235 9136 4242 9160 4264 9160 4265 9113
TIME...MOT...LOC 0020Z 235DEG 41KT 4262 9120
$$
McClureThe office that day
Everything else NWS Quad Cities, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 20, 5:50 PM CDT | Special Weather Statement | DVN | Keokuk | 25 min |
| Sep 20, 6:16 PM CDT | Special Weather Statement | DVN | Washington | 29 min |
| Sep 20, 6:26 PM CDT | Special Weather Statement | DVN | Buchanan | 34 min |
| Sep 20, 6:28 PM CDT | Special Weather Statement | DVN | Benton, Linn | 32 min |
| Sep 20, 6:34 PM CDT | Special Weather Statement | DVN | Keokuk | 26 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.