Alert archive / Iowa / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 128, NWS Des Moines, IA
NWS Des Moines, IA issued this severe thunderstorm warning at Dec 15, 2021, 6:13 PM CST for 8 counties in Iowa. It was in force for 62 min. 3 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, 6:13 PM CST (00:13 UTC)
- Expired
- Dec 15, 2021, 7:15 PM CST
- In force
- 62 min
- Issued by
- NWS Des Moines, IA
- Area
- Storm-based polygon
- Tornado
- Possible
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties Appanoose County, IA, Clarke County, IA, Decatur County, IA, Lucas County, IA, Marion County, IA, Monroe County, IA, Warren County, IA, Wayne County, IA
The radar
The Des Moines radar (KDMX), 82 km from the middle of the area, began a volume at 00:18 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, 6:18 PM CST | TSTM WND DMG | Osceola, IA | TREES DOWN ON POWER LINES IN OSCEOLA. TIME ESTIMATED FROM RADAR. |
| Dec 15, 6:29 PM CST | TSTM WND GST 60 | 5 Ene Osceola, IA | |
| Dec 15, 6:48 PM CST | TSTM WND GST 64 | 3 W Chariton, IA | PEAK WIND AT KCNC. |
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, 1:23 PM CST | Tornado Watch | SPC | 7 hr |
The nearest sounding before it
Omaha, NE (KOAX), launched 00:00Z, 0.2 hours before the alert went out and 235 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
- 4 J/kg
- Mixed-layer CIN
- -66 J/kg
- Mixed-layer LCL
- 1685 m above ground
- 0-6 km bulk shear
- 103 kt
- 0-1 km storm-relative helicity
- -450 m²/s²
- 0-3 km storm-relative helicity
- -705 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
471
WUUS53 KDMX 160013
SVRDMX
IAC007-039-053-117-125-135-181-185-160115-
/O.NEW.KDMX.SV.W.0128.211216T0013Z-211216T0115Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Des Moines IA
613 PM CST Wed Dec 15 2021
The National Weather Service in Des Moines has issued a
* Severe Thunderstorm Warning for...
Western Monroe County in south central Iowa...
Lucas County in south central Iowa...
Decatur County in south central Iowa...
Southwestern Marion County in south central Iowa...
Wayne County in south central Iowa...
Western Appanoose County in south central Iowa...
Clarke County in south central Iowa...
Southern Warren County in south central Iowa...
* Until 715 PM CST.
* At 613 PM CST, severe thunderstorms were located along a line
extending from near New Virginia to 7 miles southeast of Lamoni,
moving east at 50 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
* These severe thunderstorms will remain over mainly rural areas of
western Monroe, Lucas, Decatur, southwestern Marion, Wayne, western
Appanoose, Clarke and southern Warren Counties, including the
following locations... Melrose, Red Haw Lake State Park,
Pleasanton, Promise City, Clio, Williamson, Nine Eagles State Park,
Decatur City, Humeston and Lineville.
This includes Interstate 35 between mile markers 4 and 44.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
A Tornado Watch remains in effect until 800 PM CST for south central
Iowa.
&&
LAT...LON 4116 9385 4116 9380 4117 9379 4118 9295
4059 9305 4058 9390
TIME...MOT...LOC 0013Z 269DEG 43KT 4121 9378 4057 9382
TORNADO...POSSIBLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
Martin1 follow-up statement
602 WWUS53 KDMX 160049 SVSDMX Severe Weather Statement National Weather Service Des Moines IA 649 PM CST Wed Dec 15 2021 IAC007-039-053-117-125-135-181-185-160115- /O.CON.KDMX.SV.W.0128.000000T0000Z-211216T0115Z/ Monroe IA-Lucas IA-Decatur IA-Marion IA-Wayne IA-Appanoose IA- Clarke IA-Warren IA- 649 PM CST Wed Dec 15 2021 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 715 PM CST FOR WESTERN MONROE...LUCAS...EASTERN DECATUR...SOUTHWESTERN MARION... WAYNE...WESTERN APPANOOSE...EASTERN CLARKE AND SOUTHEASTERN WARREN COUNTIES... At 649 PM CST, severe thunderstorms were located along a line extending from Melcher-Dallas to 12 miles south of Corydon, moving east at 50 mph. HAZARD...60 mph wind gusts. SOURCE...Radar indicated. IMPACT...Expect damage to roofs, siding, and trees. Locations impacted include... Chariton, Corydon, Rathbun Lake, Seymour, Russell, Allerton, Humeston, Lineville, Lucas, Garden Grove, Woodburn, Williamson, Derby, Melrose, Promise City, Clio, Plano, Marysville, Pleasanton and Millerton. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Tornado Watch remains in effect until 800 PM CST for south central Iowa. For your protection move to an interior room on the lowest floor of a building. && LAT...LON 4116 9362 4118 9295 4059 9305 4058 9376 TIME...MOT...LOC 0049Z 269DEG 43KT 4122 9324 4058 9328 TORNADO...POSSIBLE HAIL THREAT...RADAR INDICATED MAX HAIL SIZE...<.75 IN WIND THREAT...RADAR INDICATED MAX WIND GUST...60 MPH $$ Martin
The office that day
Everything else NWS Des Moines, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Dec 15, 6:19 PM CST | Tornado Warning | DMX | Hancock, Kossuth, Winnebago | 41 min |
| Dec 15, 6:24 PM CST | Severe Thunderstorm Warning | DMX | Clarke, Dallas, Jasper, Lucas, Madison, Mahaska and 5 more | 66 min |
| Dec 15, 6:30 PM CST | Severe Thunderstorm Warning | DMX | Black Hawk, Bremer, Butler, Cerro Gordo, Franklin, Grundy and 6 more | 75 min |
| Dec 15, 6:37 PM CST | Tornado Warning | DMX | Butler, Cerro Gordo, Franklin | 20 min |
| Dec 15, 6:47 PM CST | Severe Thunderstorm Warning | DMX | Grundy, Hardin, Marshall, Story | 43 min |
| Dec 15, 7:09 PM CST | Severe Thunderstorm Warning | DMX | Appanoose, Davis, Jasper, Lucas, Mahaska, Marion and 5 more | 66 min |
| Dec 15, 7:44 PM CST | Severe Thunderstorm Warning | DMX | Black Hawk, Bremer, Butler, Grundy, Tama | 27 min |
| Dec 15, 11:52 PM CST | Wind Advisory | DMX | Adair, Adams, Appanoose, Audubon, Black Hawk, Boone and 45 more | 6 hr |
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.