Alert archive / Iowa / Tornado Warnings in 2014

Tornado Warning 33, NWS Sioux Falls, SD

June 18, 2014Clay County, Iowa

NWS Sioux Falls, SD issued this tornado warning at Jun 18, 2014, 1:06 AM CDT for Clay County, Iowa. It was in force for 24 min. 4 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
Jun 18, 2014, 1:06 AM CDT (06:06 UTC)
Expired
Jun 18, 2014, 1:30 AM CDT
In force
24 min
Issued by
NWS Sioux Falls, SD
Area
Storm-based polygon
Tornado
Radar indicated
Hail
1.25 in

County Clay County, IA

The radar

The Sioux Falls radar (KFSD), 150 km from the middle of the area, began a volume at 06:09 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

TimeReportWhereRemark
Jun 18, 1:08 AM CDTTSTM WND GST 593 Wnw Spencer, IA
Jun 18, 1:13 AM CDTTSTM WND GST 663 Wnw Spencer, IA
Jun 18, 1:15 AM CDTTORNADO3 Nw Royal, IADAMAGE TO FARM OUTBUILDINGS
Jun 18, 1:18 AM CDTTSTM WND DMGSpencer, IALARGE TREE LIMBS DOWN.

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.

IssuedProductOfficeLasted
Jun 17, 11:39 PM CDTTornado WatchSPC5 hr

The nearest sounding before it

Omaha, NE (KOAX), launched 00:00Z, 6.1 hours before the alert went out and 216 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-pSkew-T log-p diagram, Omaha, NE at 00:00Z on 2014-06-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 4092 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Omaha, NE at 00:00Z on 2014-06-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 98 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
4092 J/kg
Mixed-layer CIN
-70 J/kg
Mixed-layer LCL
1440 m above ground
0-6 km bulk shear
28 kt
0-1 km storm-relative helicity
98 m²/s²
0-3 km storm-relative helicity
163 m²/s²
Significant tornado parameter
1.0
Supercell composite
14.4

Open this sounding in Storm Lab

The text

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

879 
WFUS53 KFSD 180606
TORFSD
IAC041-180630-
/O.NEW.KFSD.TO.W.0033.140618T0606Z-140618T0630Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
106 AM CDT WED JUN 18 2014

THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A

* TORNADO WARNING FOR...
  CLAY COUNTY IN NORTHWEST IOWA...

* UNTIL 130 AM CDT

* AT 104 AM CDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A
  TORNADO WAS LOCATED NEAR ROYAL...AND MOVING EAST AT 30 MPH.

  HAZARD...TORNADO AND HALF DOLLAR SIZE HAIL.

  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...
  ROYAL AROUND 115 AM CDT.
  GREENVILLE AROUND 125 AM CDT.

OTHER LOCATIONS IN THE WARNING INCLUDE ROSSIE AND GILLETT GROVE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW. MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
STURDY BUILDING. AVOID WINDOWS. IF IN A MOBILE HOME...A VEHICLE OR
OUTDOORS...MOVE TO THE CLOSEST SUBSTANTIAL SHELTER AND PROTECT
YOURSELF FROM FLYING DEBRIS.

&&

LAT...LON 4291 9492 4290 9502 4296 9539 4324 9539
      4312 9490 4296 9491
TIME...MOT...LOC 0606Z 279DEG 28KT 4306 9536

TORNADO...RADAR INDICATED
HAIL...1.25IN

$$

SCHUMACHER
1 follow-up statement
304 
WWUS53 KFSD 180624
SVSFSD

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
124 AM CDT WED JUN 18 2014

IAC041-180630-
/O.CON.KFSD.TO.W.0033.000000T0000Z-140618T0630Z/
CLAY IA-
124 AM CDT WED JUN 18 2014

...A TORNADO WARNING REMAINS IN EFFECT FOR CLAY COUNTY UNTIL 130 AM
CDT...

AT 121 AM CDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO
WAS LOCATED NEAR ROYAL...AND MOVING EAST AT 25 MPH.

HAZARD...TORNADO AND HALF DOLLAR SIZE HAIL.

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...
  GREENVILLE AND SPENCER AROUND 130 AM CDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW. MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
STURDY BUILDING. AVOID WINDOWS. IF IN A MOBILE HOME...A VEHICLE OR
OUTDOORS...MOVE TO THE CLOSEST SUBSTANTIAL SHELTER AND PROTECT
YOURSELF FROM FLYING DEBRIS.

&&

LAT...LON 4291 9492 4290 9499 4291 9506 4296 9539
      4322 9530 4312 9490 4296 9491
TIME...MOT...LOC 0624Z 269DEG 23KT 4307 9520

TORNADO...RADAR INDICATED
HAIL...1.25IN

$$

SCHUMACHER

The office that day

Everything else NWS Sioux Falls, SD issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jun 17, 9:41 PM CDTSevere Thunderstorm WarningFSDSioux49 min
Jun 17, 10:28 PM CDTSevere Thunderstorm WarningFSDLyon, Sioux47 min
Jun 17, 11:03 PM CDTSevere Thunderstorm WarningFSDLyon, Sioux42 min
Jun 17, 11:08 PM CDTTornado WarningFSDLyon, Sioux52 min
Jun 17, 11:29 PM CDTFlash Flood WarningFSDWoodbury9 hr
Jun 18, 12:22 AM CDTSevere Thunderstorm WarningFSDO'Brien, Osceola23 min
Jun 18, 1:19 AM CDTSevere Thunderstorm WarningFSDBuena Vista, Clay41 min
Jun 18, 1:26 AM CDTTornado WarningFSDClay49 min
Jun 18, 7:29 AM CDTRiver Flood WarningFSDO'Brien, Sioux46 hr
Jun 18, 1:01 PM CDTRiver Flood WarningFSDClay, Dickinson12 hr

Nearby

Tornado Warnings in Iowa, 2014Every tornado warning in 2014Tornadoes in 2014

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.