Alert archive / Iowa / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 121, NWS Des Moines, IA
NWS Des Moines, IA issued this severe thunderstorm warning at Dec 15, 2021, 4:13 PM CST for 8 counties in Iowa. It was in force for 77 min. 8 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, 4:13 PM CST (22:13 UTC)
- Expired
- Dec 15, 2021, 5:30 PM CST
- In force
- 77 min
- Issued by
- NWS Des Moines, IA
- Area
- Storm-based polygon
- Tornado
- Possible
- Damage threat
- Destructive
- Hail
- 0.75 in
- Wind
- 80.0 mph
Counties Adair County, IA, Adams County, IA, Audubon County, IA, Cass County, IA, Guthrie County, IA, Ringgold County, IA, Taylor County, IA, Union County, IA
The radar
The Des Moines radar (KDMX), 113 km from the middle of the area, began a volume at 22:16 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, 5:01 PM CST | TORNADO | 3 Ssw Brayton, IA | STORM CHASER REPORTED FLIPPED SEMIS ON I-80 AND POWER FLASHES ASSOCIATED WITH A TORNADO. |
| Dec 15, 5:02 PM CST | TORNADO | 1 Nw Atlantic, IA | STORM CHASER REPORTED TORNADO ON THE WEST SIDE OF ATLANTIC. |
| Dec 15, 5:04 PM CST | TORNADO | Exira, IA | CORRECTS PREVIOUS TORNADO REPORT FROM EXIRA. DAMAGE TO MULTIPLE TO BARN BUILDINGS NEAR EXIRA. DELAYED REPORT VIA SOCIAL MEDIA PHOTOS. TIME ESTIMATED VIA RADAR. |
| Dec 15, 5:07 PM CST | TORNADO | 4 Se Audubon, IA | DELAYED REPORT. PICTURES CAME IN VIA EMAIL EAST OF HAMLIN, IA. TIME ESTIMATED BASED ON RADAR AND OTHER REPORTS IN AUDUBON COUNTY. |
| Dec 15, 5:11 PM CST | TSTM WND GST 88 | Audubon, IA | PWS RECORDED WIND GUST OF 88 MPH. |
| Dec 15, 5:12 PM CST | TSTM WND GST 76 | Adair, IA | PWS RECORDED A 76 MPH WIND GUST. |
| Dec 15, 5:15 PM CST | TSTM WND GST 80 | 2 S Adair, IA | EM REPORTS 80+ MPH WINDS, ZERO VISIBILITY SOUTH OF ADAIR. |
| Dec 15, 5:17 PM CST | TSTM WND GST 65 | 8 W Guthrie Center, IA | EM REPORTS 1/2 INCH HAIL AND ESTIMATED 65 MPH WIND, HWY 44 AND FRONTIER ROAD IN GUTHRIE CO. |
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 12:00Z, 10.2 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 2165 m above ground
- 0-6 km bulk shear
- 42 kt
- 0-1 km storm-relative helicity
- 346 m²/s²
- 0-3 km storm-relative helicity
- 384 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
363
WUUS53 KDMX 152213
SVRDMX
IAC001-003-009-029-077-159-173-175-152330-
/O.NEW.KDMX.SV.W.0121.211215T2213Z-211215T2330Z/
BULLETIN - EAS ACTIVATION REQUESTED
Severe Thunderstorm Warning
National Weather Service Des Moines IA
413 PM CST Wed Dec 15 2021
The National Weather Service in Des Moines has issued a
* Severe Thunderstorm Warning for...
Cass County in southwestern Iowa...
Western Union County in south central Iowa...
Western Guthrie County in west central Iowa...
Audubon County in west central Iowa...
Adams County in southwestern Iowa...
Western Ringgold County in south central Iowa...
Taylor County in southwestern Iowa...
Western Adair County in southwestern Iowa...
* Until 530 PM CST.
* At 412 PM CST, severe thunderstorms were located along a line
extending from near Pisgah to near Hamburg, moving northeast at 70
mph.
THESE ARE DESTRUCTIVE STORMS FOR SOUTHWEST IOWA!
HAZARD...80 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Flying debris will be dangerous to those caught without
shelter. Mobile homes will be heavily damaged. Expect
considerable damage to roofs, windows, and vehicles.
Extensive tree damage and power outages are likely.
* Locations impacted include...
Corning and Lenox.
This includes Interstate 80 between mile markers 50 and 82.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A Tornado Watch remains in effect until 800 PM CST for south central,
southwestern and west central Iowa.
For your protection move to an interior room on the lowest floor of a
building.
This is an EXTREMELY DANGEROUS SITUATION with tornado like wind
speeds expected. Mobile homes and high profile vehicles are
especially susceptible to winds of this magnitude and may be
overturned. For your protection move to an interior room on the
lowest floor of a building. These storms have the potential to cause
serious injury and significant property damage.
&&
LAT...LON 4057 9491 4116 9493 4116 9516 4150 9515
4151 9504 4160 9504 4160 9509 4186 9509
4186 9462 4057 9426
TIME...MOT...LOC 2212Z 246DEG 63KT 4180 9600 4057 9571
TORNADO...POSSIBLE
THUNDERSTORM DAMAGE THREAT...DESTRUCTIVE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...80 MPH
$$
Martin1 follow-up statement
761
WWUS53 KDMX 152241 RRA
SVSDMX
Severe Weather Statement
National Weather Service Des Moines IA
441 PM CST Wed Dec 15 2021
IAC001-003-009-029-077-159-173-175-152330-
/O.CON.KDMX.SV.W.0121.000000T0000Z-211215T2330Z/
Cass IA-Union IA-Guthrie IA-Audubon IA-Adams IA-Ringgold IA-
Taylor IA-Adair IA-
441 PM CST Wed Dec 15 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 530 PM CST
FOR CASS...WESTERN UNION...WESTERN GUTHRIE...AUDUBON...ADAMS...
WESTERN RINGGOLD...TAYLOR AND WESTERN ADAIR COUNTIES...
At 440 PM CST, severe thunderstorms were located along a line
extending from near Denison to near Clarinda, moving northeast at 70
mph.
THESE ARE DESTRUCTIVE STORMS FOR SOUTHWEST IOWA!
HAZARD...80 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Flying debris will be dangerous to those caught without
shelter. Mobile homes will be heavily damaged. Expect
considerable damage to roofs, windows, and vehicles.
Extensive tree damage and power outages are likely.
Locations impacted include...
Atlantic, Audubon, Greenfield, Corning, Bedford, Lenox, Griswold,
Lake Icaria, Anita, Exira, Adair, Fontanelle, Elk Horn, Lewis, Casey,
New Market, Clearfield, Massena, Diagonal and Kimballton.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A Tornado Watch remains in effect until 800 PM CST for south central,
southwestern and west central Iowa.
This is an EXTREMELY DANGEROUS SITUATION with tornado like wind
speeds expected. Mobile homes and high profile vehicles are
especially susceptible to winds of this magnitude and may be
overturned. For your protection move to an interior room on the
lowest floor of a building. These storms have the potential to cause
serious injury and significant property damage.
&&
LAT...LON 4057 9491 4116 9493 4116 9516 4150 9515
4151 9504 4160 9504 4160 9509 4186 9509
4186 9462 4057 9426
TIME...MOT...LOC 2240Z 246DEG 63KT 4200 9541 4077 9512
TORNADO...POSSIBLE
THUNDERSTORM DAMAGE THREAT...DESTRUCTIVE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...80 MPH
$$
MartinThe office that day
Everything else NWS Des Moines, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Dec 15, 4:16 PM CST | Severe Thunderstorm Warning | DMX | Carroll, Crawford, Sac | 74 min |
| Dec 15, 4:37 PM CST | Tornado Warning | DMX | Cass | 23 min |
| Dec 15, 4:44 PM CST | Tornado Warning | DMX | Crawford | 36 min |
| Dec 15, 4:53 PM CST | Tornado Warning | DMX | Adair, Audubon, Cass, Guthrie | 33 min |
| Dec 15, 5:07 PM CST | Tornado Warning | DMX | Sac | 27 min |
| Dec 15, 5:10 PM CST | Severe Thunderstorm Warning | DMX | Adair, Audubon, Boone, Dallas, Greene, Guthrie and 4 more | 80 min |
| Dec 15, 5:10 PM CST | Tornado Warning | DMX | Carroll, Crawford | 35 min |
| Dec 15, 5:14 PM CST | Tornado Warning | DMX | Audubon, Calhoun, Carroll, Greene, Guthrie | 31 min |
| Dec 15, 5:15 PM CST | Tornado Warning | DMX | Calhoun, Carroll, Crawford, Sac | 30 min |
| Dec 15, 5:18 PM CST | Tornado Warning | DMX | Adair, Boone, Dallas, Greene, Guthrie | 42 min |
| Dec 15, 5:19 PM CST | Severe Thunderstorm Warning | DMX | Boone, Calhoun, Carroll, Emmet, Greene, Humboldt and 5 more | 71 min |
| Dec 15, 5:22 PM CST | Severe Thunderstorm Warning | DMX | Carroll, Crawford, Sac | 23 min |
| Dec 15, 5:22 PM CST | Severe Thunderstorm Warning | DMX | Adair, Adams, Clarke, Decatur, Madison, Ringgold and 3 more | 68 min |
| Dec 15, 5:36 PM CST | Tornado Warning | DMX | Calhoun, Humboldt, Kossuth, Palo Alto, Pocahontas | 24 min |
| Dec 15, 5:38 PM CST | Tornado Warning | DMX | Boone, Calhoun, Greene, Hamilton, Webster | 37 min |
| Dec 15, 5:45 PM CST | Tornado Warning | DMX | Calhoun, Pocahontas, Webster | 30 min |
| Dec 15, 5:52 PM CST | Severe Thunderstorm Warning | DMX | Boone, Franklin, Hamilton, Hancock, Hardin, Humboldt and 6 more | 53 min |
| Dec 15, 5:58 PM CST | Tornado Warning | DMX | Hancock, Humboldt, Kossuth, Palo Alto, Pocahontas | 32 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.