Alert archive / Iowa / Tornado Warnings in 2015

Tornado Warning 29, NWS Sioux Falls, SD

October 23, 2015Plymouth County, Iowa

NWS Sioux Falls, SD issued this tornado warning at Oct 23, 2015, 5:47 PM CDT for Plymouth County, Iowa. It was in force for 28 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, 5:47 PM CDT (22:47 UTC)
Expired: Oct 23, 2015, 6:15 PM CDT
In force: 28 min
Issued by: NWS Sioux Falls, SD
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.75 in

County Plymouth County, IA

The radar

The Sioux Falls radar (KFSD), 94 km from the middle of the area, began a volume at 22:49 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, 5:57 PM CDT	FUNNEL CLOUD	1 Sse Brunsville, 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, 10.8 hours before the alert went out and 168 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

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

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

441 
WFUS53 KFSD 232247
TORFSD
IAC149-232315-
/O.NEW.KFSD.TO.W.0029.151023T2247Z-151023T2315Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
547 PM CDT FRI OCT 23 2015

THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A

* TORNADO WARNING FOR...
  NORTH CENTRAL PLYMOUTH COUNTY IN NORTHWESTERN IOWA...

* UNTIL 615 PM CDT
    
* AT 546 PM CDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A
  TORNADO WAS LOCATED NEAR MERRILL...OR NEAR LE MARS...MOVING
  NORTHEAST AT 20 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...
  BRUNSVILLE AROUND 610 PM CDT.
  STRUBLE AROUND 615 PM CDT.

OTHER LOCATIONS IMPACTED BY THIS TORNADIC THUNDERSTORM INCLUDE
BRUNSVILLE.

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 4273 9631 4283 9638 4291 9625 4291 9599
      4286 9606
TIME...MOT...LOC 2246Z 231DEG 17KT 4278 9631 

TORNADO...RADAR INDICATED
HAIL...<.75IN

$$

WEISSER

1 follow-up statement

308 
WWUS53 KFSD 232256 RRA
SVSFSD

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
556 PM CDT FRI OCT 23 2015

IAC149-232315-
/O.CON.KFSD.TO.W.0029.000000T0000Z-151023T2315Z/
PLYMOUTH IA-
556 PM CDT FRI OCT 23 2015

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 615 PM CDT FOR NORTH
CENTRAL PLYMOUTH COUNTY...
    
AT 556 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 DANGEROUS STORM WILL BE NEAR...
  LE MARS AND STRUBLE AROUND 610 PM CDT.

OTHER LOCATIONS IMPACTED BY THIS TORNADIC THUNDERSTORM INCLUDE
BRUNSVILLE.

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 4273 9631 4283 9638 4291 9625 4291 9599
      4286 9606
TIME...MOT...LOC 2256Z 243DEG 20KT 4280 9623 

TORNADO...RADAR INDICATED
HAIL...<.75IN

$$

WEISSER

The 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 Tornado observed	FSD	Sioux	32 min
Oct 23, 5:45 PM CDT	Tornado Warning	FSD	Cherokee	30 min
Oct 23, 6:08 PM CDT	Tornado Warning Tornado observed	FSD	O'Brien	37 min
Oct 23, 6:12 PM CDT	Tornado Warning	FSD	Plymouth, Sioux	33 min
Oct 23, 6:16 PM CDT	Tornado Warning	FSD	Cherokee, O'Brien	29 min
Oct 23, 6:42 PM CDT	Tornado Warning Tornado observed	FSD	O'Brien	14 min
Oct 23, 6:44 PM CDT	Tornado Warning	FSD	O'Brien, Osceola	31 min

Nearby

Tornado Warnings in Iowa, 2015 Every tornado warning in 2015 Tornadoes 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.