Alert archive / Iowa / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 172, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this severe thunderstorm warning at Dec 15, 2021, 4:05 PM CST for 5 counties in Iowa. It was in force for 55 min. 12 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, 4:05 PM CST (22:05 UTC)
- Expired
- Dec 15, 2021, 5:00 PM CST
- In force
- 55 min
- Issued by
- NWS Sioux Falls, SD
- Area
- Storm-based polygon
- Tornado
- Possible
- Damage threat
- Considerable
- Hail
- 0.75 in
- Wind
- 70.0 mph
Counties Buena Vista County, IA, Cherokee County, IA, Ida County, IA, Plymouth County, IA, Woodbury County, IA
The radar
The Sioux Falls radar (KFSD), 120 km from the middle of the area, began a volume at 22:07 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, 4:34 PM CST | TSTM WND DMG | 1 W Anthon, IA | CATTLE BARN AND GARAGE DAMAGED. TIME ESTIMATED FROM RADAR. |
| Dec 15, 4:35 PM CST | TSTM WND DMG | Kingsley, IA | ROOF TOWN OFF OF BUILDING. TIME ESTIMATED FROM RADAR. |
| Dec 15, 4:43 PM CST | TSTM WND DMG | 2 Nw Battle Creek, IA | MACHINE SHED DAMAGED. TIME ESTIMATED FROM RADAR. |
| Dec 15, 4:48 PM CST | TSTM WND DMG | 6 Nw Ida Grove, IA | MACHINE SHED DAMAGE. TIME ESTIMATED FROM RADAR. |
| Dec 15, 4:50 PM CST | TSTM WND DMG | 4 Sse Holstein, IA | TREES DOWN. TIME ESTIMATED FROM RADAR. |
| Dec 15, 4:52 PM CST | TSTM WND DMG | 6 Ssw Cleghorn, IA | MACHINE SHED DESTROYED AND GRAVITY WAGON TIPPED OVER. REPORT VIA SOCIAL MEDIA. |
| Dec 15, 4:56 PM CST | TSTM WND DMG | 1 Ssw Marcus, IA | ROOFS WERE BLOWN OFF OF A FEW BUILDINGS AND SEMI WAS BLOWN OFF THE ROAD. TIME ESTIMATED FROM RADAR. |
| Dec 15, 4:57 PM CST | TSTM WND DMG | 2 Nnw Galva, IA | HOUSE DAMAGED WITH ROOF TORN OFF. HOOP BARN DESTROYED AND 100 YEAR OLD MARCHINE SHED DESTOYED. TIME ESTIMATED FROM RADAR. |
| Dec 15, 5:01 PM CST | TSTM WND DMG | 5 Sw Alta, IA | NUMEROUS TREES AND BRANCHES DOWN. REPORT RECEIVED VIA SOCIAL MEDIA. TIME ESTIMATED FROM RADAR. |
| Dec 15, 5:03 PM CST | TSTM WND DMG | Aurelia, IA | SILO DAMAGED, TREES DOWN AND SHEET METAL FROM BUILDINGS ON ROAD. POWER OUT IN TOWN. TIME ESTIMATED FROM RADAR. |
| Dec 15, 5:03 PM CST | TSTM WND DMG | Aurelia, IA | UPDATES PREVIOUS TSTM WND DMG REPORT FROM AURELIA. SILO DAMAGED, TREES DOWN AND SHEET METAL FROM BUILDINGS ON ROAD. 3 RAIL CARS BLOWN OVER, AND A HOME DESTROYED. POWER OUT IN TOWN. TIME ESTIMATED FROM RADAR. |
| Dec 15, 5:04 PM CST | TSTM WND DMG | Larrabee, IA | DAMAGE TO MACHINE SHEDS AND SOME ROOFS DAMAGE. TIME ESTIMATED FROM RADAR. |
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, 10.1 hours before the alert went out and 152 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.
215
WUUS53 KFSD 152205
SVRFSD
IAC021-035-093-149-193-152300-
/O.NEW.KFSD.SV.W.0172.211215T2205Z-211215T2300Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Sioux Falls SD
405 PM CST Wed Dec 15 2021
The National Weather Service in Sioux Falls has issued a
* Severe Thunderstorm Warning for...
Cherokee County in northwestern Iowa...
Eastern Woodbury County in west central Iowa...
Plymouth County in northwestern Iowa...
Southwestern Buena Vista County in northwestern Iowa...
Ida County in west central Iowa...
* Until 500 PM CST.
* At 403 PM CST, severe thunderstorms were located along a line
extending from Allen to near Winnebago to 8 miles northeast of
Craig, moving northeast at 65 mph.
HAZARD...70 mph wind gusts and penny size hail.
SOURCE...Radar indicated.
IMPACT...Expect considerable tree damage. Damage is likely to
mobile homes, roofs, and outbuildings.
* Severe thunderstorms will be near...
Kingsley, Smithland, Merrill and Pierson around 430 PM CST.
Danbury, Washta and Craig around 440 PM CST.
Le Mars, Battle Creek, Quimby and Struble around 445 PM CST.
Ida Grove, Cleghorn and Cushing around 450 PM CST.
Cherokee and Holstein around 455 PM CST.
Other locations impacted by these severe thunderstorms include Oyens,
Oto, Brunsville, Meriden, Westfield and Chatsworth.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A Tornado Watch remains in effect until 800 PM CST for northwestern
and west central Iowa...and southeastern South Dakota.
This is a DANGEROUS SITUATION. These storms are producing widespread
wind damage across parts of Nebraska. SEEK SHELTER NOW inside a
sturdy structure and stay away from windows! A Tornado Watch remains
in effect until 800 PM CST for northwestern and west central
Iowa...and southeastern South Dakota.
&&
LAT...LON 4270 9607 4273 9663 4277 9663 4283 9658
4284 9655 4289 9654 4291 9652 4291 9538
4256 9533 4256 9539 4248 9539 4247 9532
4222 9533 4221 9603
TIME...MOT...LOC 2203Z 225DEG 58KT 4243 9686 4225 9636 4189 9628
TORNADO...POSSIBLE
THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...70 MPH
$$
Weisser1 follow-up statement
281
WWUS53 KFSD 152236
SVSFSD
Severe Weather Statement
National Weather Service Sioux Falls SD
436 PM CST Wed Dec 15 2021
IAC021-035-093-149-193-152300-
/O.CON.KFSD.SV.W.0172.000000T0000Z-211215T2300Z/
Cherokee IA-Woodbury IA-Plymouth IA-Buena Vista IA-Ida IA-
436 PM CST Wed Dec 15 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 500 PM CST
FOR CHEROKEE...EASTERN WOODBURY...PLYMOUTH...SOUTHWESTERN BUENA VISTA
AND IDA COUNTIES...
At 435 PM CST, severe thunderstorms were located along a line
extending from 8 miles northwest of Merrill to near Pierson to near
Danbury, moving northeast at 65 mph.
HAZARD...80 mph wind gusts and penny size hail.
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.
These severe storms will be near...
Washta around 440 PM CST.
Le Mars, Battle Creek, Quimby and Struble around 445 PM CST.
Ida Grove, Cleghorn and Cushing around 450 PM CST.
Cherokee and Holstein around 455 PM CST.
Galva and Larrabee around 500 PM CST.
Other locations impacted by these severe thunderstorms include Oyens,
Oto, Brunsville, Meriden, Westfield and Chatsworth.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A Tornado Watch remains in effect until 800 PM CST for northwestern
and west central Iowa...and southeastern South Dakota.
This is a DANGEROUS SITUATION. These storms are producing widespread
wind damage across parts of Nebraska as well as tornadoes in parts
of Woodbury county. SEEK SHELTER NOW inside a sturdy structure and
stay away from windows.
&&
LAT...LON 4270 9607 4273 9663 4277 9663 4283 9658
4284 9655 4289 9654 4291 9652 4291 9538
4256 9533 4256 9539 4248 9539 4247 9532
4222 9533 4221 9603
TIME...MOT...LOC 2235Z 225DEG 58KT 4278 9639 4260 9589 4224 9581
TORNADO...POSSIBLE
THUNDERSTORM DAMAGE THREAT...DESTRUCTIVE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...80 MPH
$$
WeisserThe office that day
Everything else NWS Sioux Falls, SD issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Dec 15, 2:56 AM CST | Dense Fog Advisory | FSD | Buena Vista, Cherokee, Clay, Dickinson, Ida, Lyon and 5 more | 6 hr |
| Dec 15, 3:23 PM CST | Severe Thunderstorm Warning | FSD | Plymouth, Woodbury | 67 min |
| Dec 15, 4:00 PM CST | Tornado Warning | FSD | Woodbury | 45 min |
| Dec 15, 4:17 PM CST | Tornado Warning | FSD | Plymouth, Woodbury | 28 min |
| Dec 15, 4:26 PM CST | Severe Thunderstorm Warning | FSD | Plymouth, Woodbury | 34 min |
| Dec 15, 4:31 PM CST | Tornado Warning | FSD | Ida, Plymouth, Woodbury | 29 min |
| Dec 15, 4:32 PM CST | Tornado Warning | FSD | Plymouth, Woodbury | 28 min |
| Dec 15, 4:42 PM CST | Tornado Warning | FSD | Buena Vista, Cherokee, Clay, Ida, O'Brien, Plymouth and 1 more | 33 min |
| Dec 15, 4:51 PM CST | Severe Thunderstorm Warning | FSD | O'Brien, Sioux | 39 min |
| Dec 15, 4:56 PM CST | Severe Thunderstorm Warning | FSD | Buena Vista, Cherokee, Clay, Ida | 46 min |
| Dec 15, 5:08 PM CST | Tornado Warning | FSD | Buena Vista, Cherokee, Clay | 37 min |
| Dec 15, 5:15 PM CST | Tornado Warning | FSD | Buena Vista, Cherokee, Clay, O'Brien | 30 min |
| Dec 15, 5:29 PM CST | Severe Thunderstorm Warning | FSD | Dickinson | 46 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.