Alert archive / Iowa / Tornado Warnings in 2023
Tornado Warning 2, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this tornado warning at May 12, 2023, 7:55 PM CDT for Woodbury County, Iowa; Dakota County, Nebraska. It was in force for 35 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
- May 12, 2023, 7:55 PM CDT (00:55 UTC)
- Expired
- May 12, 2023, 8:30 PM CDT
- In force
- 35 min
- Issued by
- NWS Sioux Falls, SD
- Area
- Storm-based polygon
- Tornado
- Radar indicated
- Hail
- 0.75 in
Counties Woodbury County, IA, Dakota County, NE
The radar
The Omaha radar (KOAX), 111 km from the middle of the area, began a volume at 00:58 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 |
|---|---|---|---|
| May 12, 1:09 PM CDT | Tornado Watch | SPC | 8 hr |
The nearest sounding before it
Omaha, NE (KOAX), launched 00:00Z, 0.9 hours before the alert went out and 111 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
- 1363 J/kg
- Mixed-layer CIN
- -5 J/kg
- Mixed-layer LCL
- 1536 m above ground
- 0-6 km bulk shear
- 40 kt
- 0-1 km storm-relative helicity
- 156 m²/s²
- 0-3 km storm-relative helicity
- 331 m²/s²
- Significant tornado parameter
- 0.6
- Supercell composite
- 8.4
The text
As transmitted.
892
WFUS53 KFSD 130055
TORFSD
IAC193-NEC043-130130-
/O.NEW.KFSD.TO.W.0002.230513T0055Z-230513T0130Z/
BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Sioux Falls SD
755 PM CDT Fri May 12 2023
The National Weather Service in Sioux Falls has issued a
* Tornado Warning for...
Southwestern Woodbury County in west central Iowa...
Eastern Dakota County in northeastern Nebraska...
* Until 830 PM CDT.
* At 755 PM CDT, a severe thunderstorm capable of producing a tornado
was located over Salix, or 13 miles south of Sioux City, moving
north at 25 mph.
HAZARD...Tornado.
SOURCE...Radar indicated rotation.
IMPACT...Flying debris will be dangerous to those caught without
shelter. Mobile homes will be damaged or destroyed.
Damage to roofs, windows, and vehicles will occur. Tree
damage is likely.
* This dangerous storm will be near...
Sergeant Bluff around 810 PM CDT.
Dakota City around 815 PM CDT.
Sioux City and South Sioux City around 820 PM CDT.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.
&&
LAT...LON 4226 9633 4228 9635 4228 9639 4247 9650
4249 9622 4226 9628 4225 9633
TIME...MOT...LOC 0055Z 170DEG 24KT 4231 9633
TORNADO...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
$$
SST2 follow-up statements
879
WWUS53 KFSD 130112
SVSFSD
Severe Weather Statement
National Weather Service Sioux Falls SD
812 PM CDT Fri May 12 2023
IAC193-NEC043-130130-
/O.CON.KFSD.TO.W.0002.000000T0000Z-230513T0130Z/
Woodbury IA-Dakota NE-
812 PM CDT Fri May 12 2023
...A TORNADO WARNING REMAINS IN EFFECT UNTIL 830 PM CDT FOR WEST
CENTRAL WOODBURY AND NORTHEASTERN DAKOTA COUNTIES...
At 812 PM CDT, a severe thunderstorm capable of producing a tornado
was located over Sergeant Bluff, or near Sioux City, moving north at
30 mph.
HAZARD...Tornado.
SOURCE...Radar indicated rotation.
IMPACT...Flying debris will be dangerous to those caught without
shelter. Mobile homes will be damaged or destroyed. Damage
to roofs, windows, and vehicles will occur. Tree damage is
likely.
Locations impacted include...
Sioux City.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.
&&
LAT...LON 4235 9637 4247 9646 4249 9622 4236 9627
TIME...MOT...LOC 0112Z 170DEG 24KT 4243 9636
TORNADO...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
$$
SST126
WWUS53 KFSD 130124
SVSFSD
Severe Weather Statement
National Weather Service Sioux Falls SD
824 PM CDT Fri May 12 2023
IAC193-NEC043-130134-
/O.EXP.KFSD.TO.W.0002.000000T0000Z-230513T0130Z/
Woodbury IA-Dakota NE-
824 PM CDT Fri May 12 2023
...THE TORNADO WARNING FOR WEST CENTRAL WOODBURY AND NORTHEASTERN
DAKOTA COUNTIES WILL EXPIRE AT 830 PM CDT...
The storm which prompted the warning has moved out of the area.
Therefore, the warning will be allowed to expire. However gusty
winds are still possible with this thunderstorm.
A Tornado Watch remains in effect until 900 PM CDT for west central
Iowa...and northeastern Nebraska.
LAT...LON 4235 9637 4247 9646 4249 9622 4236 9627
TIME...MOT...LOC 0124Z 170DEG 24KT 4250 9638
$$
SSTThe office that day
Everything else NWS Sioux Falls, SD issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 12, 7:27 PM CDT | Severe Thunderstorm Warning | FSD | Woodbury | 33 min |
| May 12, 7:46 PM CDT | Severe Thunderstorm Warning | FSD | Plymouth, Woodbury | 44 min |
| May 12, 7:50 PM CDT | Severe Thunderstorm Warning | FSD | Woodbury | 40 min |
| May 12, 8:16 PM CDT | Tornado Warning | FSD | Plymouth, Woodbury | 29 min |
| May 12, 8:17 PM CDT | Severe Thunderstorm Warning | FSD | Plymouth, Sioux | 28 min |
| May 12, 8:27 PM CDT | Severe Thunderstorm Warning | FSD | Plymouth, Woodbury | 48 min |
| May 13, 11:02 AM CDT | River Flood Warning | FSD | Dickinson | 7 days |
| May 13, 1:48 PM CDT | Tornado Warning | FSD | Buena Vista | 27 min |
| May 13, 4:25 PM CDT | Tornado Warning | FSD | Buena Vista | 35 min |
| May 13, 4:36 PM CDT | Tornado Warning | FSD | Buena Vista | 24 min |
| May 12, 7:09 PM CDT | Severe Thunderstorm Warning | FSD | Dixon | 51 min |
Nearby
Tornado Warnings in Iowa, 2023Tornado Warnings in Nebraska, 2023Every tornado warning in 2023Tornadoes in 2023
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.