Alert archive / Iowa / Tornado Warnings in 2017
Tornado Warning 7, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this tornado warning at May 17, 2017, 2:03 PM CDT for Sioux County, Iowa. It was in force for 27 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 17, 2017, 2:03 PM CDT (19:03 UTC)
- Expired
- May 17, 2017, 2:30 PM CDT
- In force
- 27 min
- Issued by
- NWS Sioux Falls, SD
- Area
- Storm-based polygon
- Tornado
- Radar indicated
- Hail
- 0.75 in
County Sioux County, IA
The radar
The Sioux Falls radar (KFSD), 78 km from the middle of the area, began a volume at 19:03 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 17, 12:08 PM CDT | Tornado Watch | SPC | 7 hr |
The nearest sounding before it
Omaha, NE (KOAX), launched 12:00Z, 7.1 hours before the alert went out and 190 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
- 121 J/kg
- Mixed-layer CIN
- -156 J/kg
- Mixed-layer LCL
- 1106 m above ground
- 0-6 km bulk shear
- 41 kt
- 0-1 km storm-relative helicity
- 119 m²/s²
- 0-3 km storm-relative helicity
- 132 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
243
WFUS53 KFSD 171903
TORFSD
IAC167-171930-
/O.NEW.KFSD.TO.W.0007.170517T1903Z-170517T1930Z/
BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Sioux Falls SD
203 PM CDT WED MAY 17 2017
The National Weather Service in Sioux Falls has issued a
* Tornado Warning for...
Central Sioux County in northwestern Iowa...
* Until 230 PM CDT
* At 203 PM CDT, a severe thunderstorm capable of producing a tornado
was located near Maurice, or near Orange City, moving northwest 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.
* This dangerous storm will be near...
Maurice around 210 PM CDT.
Sioux Center around 230 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 4294 9600 4291 9615 4313 9637 4320 9621
TIME...MOT...LOC 1903Z 153DEG 24KT 4294 9610
TORNADO...RADAR INDICATED
HAIL...<.75IN
$$
Ferguson1 follow-up statement
389
WWUS53 KFSD 171915
SVSFSD
Severe Weather Statement
National Weather Service Sioux Falls SD
215 PM CDT WED MAY 17 2017
IAC167-171930-
/O.CON.KFSD.TO.W.0007.000000T0000Z-170517T1930Z/
Sioux IA-
215 PM CDT WED MAY 17 2017
...A TORNADO WARNING REMAINS IN EFFECT UNTIL 230 PM CDT FOR CENTRAL
SIOUX COUNTY...
At 215 PM CDT, a severe thunderstorm capable of producing a tornado
was located near Maurice, or near Orange City, moving northwest at 25
mph.
HAZARD...Tornado.
SOURCE...Radar indicated rotation.
IMPACT...Flying debris will be dangerous to those caught without
shelter. Mobile homes will be damaged or destroyed. Damage
to roofs, windows, and vehicles will occur. Tree damage is
likely.
This dangerous storm will be near...
Sioux Center around 230 PM CDT.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.
&&
LAT...LON 4297 9602 4295 9615 4313 9637 4320 9621
TIME...MOT...LOC 1915Z 154DEG 20KT 4300 9613
TORNADO...RADAR INDICATED
HAIL...<.75IN
$$
FergusonThe office that day
Everything else NWS Sioux Falls, SD issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 16, 7:43 PM CDT | Severe Thunderstorm Warning | FSD | Ida | 33 min |
| May 16, 8:22 PM CDT | Severe Thunderstorm Warning | FSD | Buena Vista | 23 min |
| May 17, 11:16 AM CDT | River Flood Warning | FSD | Clay | 24 hr |
| May 17, 11:16 AM CDT | River Flood Warning | FSD | Buena Vista, Clay | 24 hr |
| May 17, 11:16 AM CDT | River Flood Warning | FSD | Plymouth, Sioux | 5 days |
| May 17, 11:16 AM CDT | River Flood Warning | FSD | Plymouth | 6 days |
| May 17, 11:16 AM CDT | River Flood Warning | FSD | Clay | 4 days |
| May 17, 11:16 AM CDT | River Flood Warning | FSD | Clay, Dickinson | 59 hr |
| May 17, 1:33 PM CDT | Tornado Warning | FSD | Sioux | 27 min |
| May 17, 1:56 PM CDT | Tornado Warning | FSD | Sioux | 34 min |
| May 17, 2:28 PM CDT | Tornado Warning | FSD | Lyon, Sioux | 32 min |
| May 17, 2:34 PM CDT | Severe Thunderstorm Warning | FSD | Lyon | 26 min |
| May 17, 3:01 PM CDT | Tornado Warning | FSD | Lyon | 29 min |
Nearby
Tornado Warnings in Iowa, 2017Every tornado warning in 2017Tornadoes in 2017
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.