Alert archive / Iowa / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 119, NWS Des Moines, IA
NWS Des Moines, IA issued this severe thunderstorm warning at Sep 20, 2021, 6:34 PM CDT for Appanoose County, Davis County, Wayne County, Iowa. It was in force for 41 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
- Sep 20, 2021, 6:34 PM CDT (23:34 UTC)
- Expired
- Sep 20, 2021, 7:15 PM CDT
- In force
- 41 min
- Issued by
- NWS Des Moines, IA
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
Counties Appanoose County, IA, Davis County, IA, Wayne County, IA
The radar
The Des Moines radar (KDMX), 135 km from the middle of the area, began a volume at 23:37 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 |
|---|---|---|---|
| Sep 20, 2:07 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
The nearest sounding before it
Davenport, (KDVN), launched 12:00Z, 11.6 hours before the alert went out and 227 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.
798
WUUS53 KDMX 202334
SVRDMX
IAC007-051-185-210015-
/O.NEW.KDMX.SV.W.0119.210920T2334Z-210921T0015Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Des Moines IA
634 PM CDT Mon Sep 20 2021
The National Weather Service in Des Moines has issued a
* Severe Thunderstorm Warning for...
Southwestern Davis County in southeastern Iowa...
Southeastern Wayne County in south central Iowa...
Southern Appanoose County in south central Iowa...
* Until 715 PM CDT.
* At 634 PM CDT, a severe thunderstorm was located 10 miles north of
Unionville, moving east at 35 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.
* Locations impacted include...
Centerville.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4071 9319 4083 9251 4060 9249 4058 9316
TIME...MOT...LOC 2334Z 252DEG 31KT 4062 9305
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
Donavon2 follow-up statements
754
WWUS53 KDMX 202348
SVSDMX
Severe Weather Statement
National Weather Service Des Moines IA
648 PM CDT Mon Sep 20 2021
IAC185-202357-
/O.CAN.KDMX.SV.W.0119.000000T0000Z-210921T0015Z/
Wayne IA-
648 PM CDT Mon Sep 20 2021
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN WAYNE COUNTY IS
CANCELLED...
The severe thunderstorm which prompted the warning has moved out of
the warned area. Therefore, the warning has been cancelled.
A Severe Thunderstorm Watch remains in effect until 1000 PM CDT for
south central and southeastern Iowa.
LAT...LON 4073 9310 4083 9251 4060 9249 4058 9310
TIME...MOT...LOC 2347Z 252DEG 42KT 4066 9285
$$
IAC007-051-210015-
/O.CON.KDMX.SV.W.0119.000000T0000Z-210921T0015Z/
Davis IA-Appanoose IA-
648 PM CDT Mon Sep 20 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 715 PM CDT
FOR SOUTHWESTERN DAVIS AND SOUTHERN APPANOOSE COUNTIES...
At 647 PM CDT, a severe thunderstorm was located near Centerville,
moving east at 50 mph.
HAZARD...60 mph wind gusts and nickel size hail.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
Locations impacted include...
Centerville, Moulton, Cincinnati, Exline, Numa, Udell, Lake Wapello
State Park, Sharon Bluffs State Park and Centerville Municipal
Airport.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4073 9310 4083 9251 4060 9249 4058 9310
TIME...MOT...LOC 2347Z 252DEG 42KT 4066 9285
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.88 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
Donavon323 WWUS53 KDMX 210001 SVSDMX Severe Weather Statement National Weather Service Des Moines IA 701 PM CDT Mon Sep 20 2021 IAC007-051-210015- /O.CON.KDMX.SV.W.0119.000000T0000Z-210921T0015Z/ Davis IA-Appanoose IA- 701 PM CDT Mon Sep 20 2021 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 715 PM CDT FOR SOUTHWESTERN DAVIS AND SOUTHEASTERN APPANOOSE COUNTIES... At 700 PM CDT, a severe thunderstorm was located 9 miles east of Centerville, moving east at 35 mph. HAZARD...60 mph wind gusts and nickel size hail. SOURCE...Radar indicated. IMPACT...Expect damage to roofs, siding, and trees. Locations impacted include... Centerville, Moulton, Cincinnati, Exline, Udell, Lake Wapello State Park, Sharon Bluffs State Park and Centerville Municipal Airport. PRECAUTIONARY/PREPAREDNESS ACTIONS... For your protection move to an interior room on the lowest floor of a building. && LAT...LON 4083 9251 4060 9249 4059 9288 4075 9299 TIME...MOT...LOC 0000Z 252DEG 31KT 4070 9270 HAIL THREAT...RADAR INDICATED MAX HAIL SIZE...0.88 IN WIND THREAT...RADAR INDICATED MAX WIND GUST...60 MPH $$ Donavon
The office that day
Everything else NWS Des Moines, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 20, 3:38 PM CDT | Severe Thunderstorm Warning | DMX | Clarke, Madison, Union, Warren | 52 min |
| Sep 20, 4:23 PM CDT | Severe Thunderstorm Warning | DMX | Clarke, Lucas, Marion, Warren | 52 min |
| Sep 20, 4:57 PM CDT | Severe Thunderstorm Warning | DMX | Lucas, Marion, Monroe, Warren | 48 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.