Alert archive / Nebraska / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 173, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this severe thunderstorm warning at Dec 15, 2021, 4:26 PM CST for Union County, South Dakota; Dakota County, Dixon County, Nebraska; Plymouth County, Woodbury County, Iowa. It was in force for 34 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, 4:26 PM CST (22:26 UTC)
- Expired
- Dec 15, 2021, 5:00 PM CST
- In force
- 34 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 Plymouth County, IA, Woodbury County, IA, Dakota County, NE, Dixon County, NE, Union County, SD
The radar
The Sioux Falls radar (KFSD), 117 km from the middle of the area, began a volume at 22:26 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, 4:31 PM CST | TSTM WND DMG | 2 E Lawton, IA | POWER LINES DOWN ACROSS HWY 20. TIME ESTIMATED FROM RADAR. |
| Dec 15, 4:31 PM CST | TSTM WND DMG | 2 Ene Lawton, IA | POLE SHED ROOF OFF WITH DEBRIS BLOWN INTO FIELD. TIME ESTIMATED FROM RADAR. |
| Dec 15, 4:33 PM CST | TORNADO | 3 Ene Lawton, IA | REPORT OF POWER FLASHES FROM POWER LINES. |
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, 10.4 hours before the alert went out and 138 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.
929
WUUS53 KFSD 152226
SVRFSD
IAC149-193-NEC043-051-SDC127-152300-
/O.NEW.KFSD.SV.W.0173.211215T2226Z-211215T2300Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Sioux Falls SD
426 PM CST Wed Dec 15 2021
The National Weather Service in Sioux Falls has issued a
* Severe Thunderstorm Warning for...
Western Woodbury County in west central Iowa...
Southwestern Plymouth County in northwestern Iowa...
Northeastern Dakota County in northeastern Nebraska...
Northeastern Dixon County in northeastern Nebraska...
Southern Union County in southeastern South Dakota...
* Until 500 PM CST.
* At 424 PM CST, severe thunderstorms were located along a line
extending from Ponca State Park to near Lawton to near Hornick,
moving north at 50 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...
Elk Point around 430 PM CST.
Moville and Hinton around 440 PM CST.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A Tornado Watch remains in effect until 800 PM CST for northwestern
and west central Iowa...northeastern Nebraska...and southeastern
South Dakota.
This is a DANGEROUS SITUATION. These storms are producing widespread
wind damage across parts of Nebraska as well as an isolated tornado
near Salix. 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...northeastern Nebraska...and
southeastern South Dakota.
&&
LAT...LON 4274 9680 4270 9606 4222 9602 4234 9629
4259 9680
TIME...MOT...LOC 2224Z 199DEG 42KT 4262 9669 4246 9626 4229 9610
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
$$
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 | Beadle, Bon Homme, Brookings, Clay, Davison, Hanson and 12 more | 6 hr |
| Dec 15, 9:01 AM CST | Dense Fog Advisory | FSD | Beadle, Brookings, Davison, Hanson, Kingsbury, Lake and 4 more | 119 min |
| Dec 15, 3:23 PM CST | Severe Thunderstorm Warning | FSD | Union | 67 min |
| Dec 15, 4:00 PM CST | Tornado Warning | FSD | Union | 45 min |
| Dec 15, 3:59 PM CST | Tornado Warning | FSD | Dakota, Dixon | 31 min |
| Dec 15, 4:05 PM CST | Severe Thunderstorm Warning | FSD | Buena Vista, Cherokee, Ida, Plymouth, Woodbury | 55 min |
| Dec 15, 4:17 PM CST | Tornado Warning | FSD | Plymouth, Woodbury | 28 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 Nebraska, 2021Severe Thunderstorm Warnings in Iowa, 2021Severe Thunderstorm Warnings in South Dakota, 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.