Alert archive / Iowa / Tornado Warnings in 2015
Tornado Warning 31, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this tornado warning at Oct 23, 2015, 6:12 PM CDT for Plymouth County, Sioux County, Iowa. It was in force for 33 min. 1 report 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
- Oct 23, 2015, 6:12 PM CDT (23:12 UTC)
- Expired
- Oct 23, 2015, 6:45 PM CDT
- In force
- 33 min
- Issued by
- NWS Sioux Falls, SD
- Area
- Storm-based polygon
- Tornado
- Radar indicated
- Hail
- 0.75 in
Counties Plymouth County, IA, Sioux County, IA
The radar
The Sioux Falls radar (KFSD), 98 km from the middle of the area, began a volume at 23:12 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 |
|---|---|---|---|
| Oct 23, 6:36 PM CDT | FUNNEL CLOUD | 6 S Alton, IA |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Omaha, NE (KOAX), launched 12:00Z, 11.2 hours before the alert went out and 174 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
- 28 J/kg
- Mixed-layer CIN
- -74 J/kg
- Mixed-layer LCL
- 554 m above ground
- 0-6 km bulk shear
- 29 kt
- 0-1 km storm-relative helicity
- 240 m²/s²
- 0-3 km storm-relative helicity
- 233 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
080
WFUS53 KFSD 232312
TORFSD
IAC149-167-232345-
/O.NEW.KFSD.TO.W.0031.151023T2312Z-151023T2345Z/
BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
612 PM CDT FRI OCT 23 2015
THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A
* TORNADO WARNING FOR...
SOUTHEASTERN SIOUX COUNTY IN NORTHWESTERN IOWA...
NORTHEASTERN PLYMOUTH COUNTY IN NORTHWESTERN IOWA...
* UNTIL 645 PM CDT
* AT 611 PM CDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A
TORNADO WAS LOCATED NEAR LE MARS...MOVING NORTHEAST 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 TORNADIC THUNDERSTORM WILL REMAIN OVER MAINLY RURAL AREAS OF
SOUTHEASTERN SIOUX AND NORTHEASTERN PLYMOUTH COUNTIES...INCLUDING
THE FOLLOWING LOCATIONS...OYENS.
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 4280 9615 4290 9617 4298 9586 4285 9586
TIME...MOT...LOC 2311Z 241DEG 21KT 4285 9612
TORNADO...RADAR INDICATED
HAIL...<.75IN
$$
WEISSER2 follow-up statements
702
WWUS53 KFSD 232329 RRA
SVSFSD
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
629 PM CDT FRI OCT 23 2015
IAC149-167-232345-
/O.CON.KFSD.TO.W.0031.000000T0000Z-151023T2345Z/
SIOUX IA-PLYMOUTH IA-
629 PM CDT FRI OCT 23 2015
...A TORNADO WARNING REMAINS IN EFFECT UNTIL 645 PM CDT FOR
SOUTHEASTERN SIOUX AND NORTHEASTERN PLYMOUTH COUNTIES...
AT 629 PM CDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO
WAS LOCATED NEAR ALTON...OR 7 MILES SOUTHEAST OF ORANGE CITY...MOVING
NORTHEAST AT 25 MPH.
HAZARD...TORNADO.
SOURCE...RADAR INDICATED ROTATION.
IMPACT...FLYING DEBRIS WILL BE DANGEROUS TO THOSE CAUGHT WITHOUT
SHELTER. MOBILE HOMES WILL BE DAMAGED OR DESTROYED. DAMAGE
TO ROOFS...WINDOWS AND VEHICLES WILL OCCUR. TREE DAMAGE IS
LIKELY.
THIS TORNADIC THUNDERSTORM WILL REMAIN OVER MAINLY RURAL AREAS OF
SOUTHEASTERN SIOUX AND NORTHEASTERN PLYMOUTH COUNTIES.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
TAKE COVER NOW! MOVE TO A BASEMENT OR AN INTERIOR ROOM ON THE LOWEST
FLOOR OF A STURDY BUILDING. AVOID WINDOWS. IF YOU ARE OUTDOORS...IN A
MOBILE HOME...OR IN A VEHICLE...MOVE TO THE CLOSEST SUBSTANTIAL
SHELTER AND PROTECT YOURSELF FROM FLYING DEBRIS.
&&
LAT...LON 4283 9601 4292 9607 4298 9586 4285 9586
TIME...MOT...LOC 2329Z 241DEG 21KT 4290 9599
TORNADO...RADAR INDICATED
HAIL...<.75IN
$$
WEISSER126
WWUS53 KFSD 232345
SVSFSD
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
645 PM CDT FRI OCT 23 2015
IAC149-167-232355-
/O.EXP.KFSD.TO.W.0031.000000T0000Z-151023T2345Z/
SIOUX IA-PLYMOUTH IA-
645 PM CDT FRI OCT 23 2015
...THE TORNADO WARNING FOR SOUTHEASTERN SIOUX AND NORTHEASTERN
PLYMOUTH COUNTIES HAS EXPIRED...
THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED BELOW SEVERE LIMITS
AND EXITED THE WARNED AREA. THEREFORE THE WARNING HAS BEEN ALLOWED TO
EXPIRE.
LAT...LON 4283 9601 4292 9607 4298 9586 4285 9586
TIME...MOT...LOC 2343Z 241DEG 21KT 4290 9599
$$
WEISSERThe office that day
Everything else NWS Sioux Falls, SD issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Oct 23, 5:43 PM CDT | Tornado Warning | FSD | Sioux | 32 min |
| Oct 23, 5:45 PM CDT | Tornado Warning | FSD | Cherokee | 30 min |
| Oct 23, 5:47 PM CDT | Tornado Warning | FSD | Plymouth | 28 min |
| Oct 23, 6:08 PM CDT | Tornado Warning | FSD | O'Brien | 37 min |
| Oct 23, 6:16 PM CDT | Tornado Warning | FSD | Cherokee, O'Brien | 29 min |
| Oct 23, 6:42 PM CDT | Tornado Warning | FSD | O'Brien | 14 min |
| Oct 23, 6:44 PM CDT | Tornado Warning | FSD | O'Brien, Osceola | 31 min |
Nearby
Tornado Warnings in Iowa, 2015Every tornado warning in 2015Tornadoes in 2015
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.