Alert archive / Iowa / Tornado Warnings in 2010

Tornado Warning 9, NWS Sioux Falls, SD

June 1, 2010Clay County, Iowa

NWS Sioux Falls, SD issued this tornado warning at Jun 1, 2010, 1:59 PM CDT for Clay County, Iowa. It was in force for 31 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
Jun 1, 2010, 1:59 PM CDT (18:59 UTC)
Expired
Jun 1, 2010, 2:30 PM CDT
In force
31 min
Issued by
NWS Sioux Falls, SD
Area
Storm-based polygon

County Clay County, IA

The radar

The Sioux Falls radar (KFSD), 144 km from the middle of the area, began a volume at 19:00 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 1, 2:10 PM CDTHAIL 1Spencer, IA

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 1, 1:53 PM CDTTornado WatchSPC9 hr

The nearest sounding before it

Omaha, NE (KOAX), launched 12:00Z, 7.0 hours before the alert went out and 226 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 12:00Z on 2010-06-01Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1529 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 12:00Z on 2010-06-01The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 80 square meters per square second.19395878Sfc1 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
1529 J/kg
Mixed-layer CIN
-110 J/kg
Mixed-layer LCL
815 m above ground
0-6 km bulk shear
39 kt
0-1 km storm-relative helicity
80 m²/s²
0-3 km storm-relative helicity
36 m²/s²
Significant tornado parameter
0.0
Supercell composite
2.1

Open this sounding in Storm Lab

The text

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

139 
WFUS53 KFSD 011859
TORFSD
IAC041-011930-
/O.NEW.KFSD.TO.W.0009.100601T1859Z-100601T1930Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
159 PM CDT TUE JUN 1 2010

THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A

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

* UNTIL 230 PM CDT

* AT 159 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS WERE
  TRACKING A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THIS
  DANGEROUS STORM WAS LOCATED NEAR ROYAL...OR 5 MILES SOUTHWEST OF
  SPENCER...AND MOVING EAST AT 30 MPH.

* THIS TORNADIC STORM WILL BE NEAR...
  SPENCER AROUND 205 PM CDT...

OTHER LOCATIONS IMPACTED BY THIS TORNADIC THUNDERSTORM INCLUDE
DICKENS.

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 4300 9526 4315 9534 4325 9491 4324 9491
      4306 9491 4305 9491
TIME...MOT...LOC 1859Z 253DEG 27KT 4309 9518

$$

WILLIAMS
2 follow-up statements
911 
WWUS53 KFSD 011911
SVSFSD

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
211 PM CDT TUE JUN 1 2010

IAC041-011930-
/O.CON.KFSD.TO.W.0009.000000T0000Z-100601T1930Z/
CLAY IA-
211 PM CDT TUE JUN 1 2010

...A TORNADO WARNING REMAINS IN EFFECT FOR NORTHEASTERN CLAY COUNTY
UNTIL 230 PM CDT...

AT 211 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS WERE TRACKING
A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO.  THIS DANGEROUS
STORM WAS LOCATED NEAR SPENCER...MOVING NORTHEAST AT 30 MPH.

THIS TORNADO WILL AFFECT THE TOWN OF DICKES BY 215 PM 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 4303 9506 4317 9519 4325 9491 4305 9491
TIME...MOT...LOC 1911Z 245DEG 27KT 4313 9507

$$

WILLIAMS
405 
WWUS53 KFSD 011927
SVSFSD

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
227 PM CDT TUE JUN 1 2010

IAC041-011937-
/O.EXP.KFSD.TO.W.0009.000000T0000Z-100601T1930Z/
CLAY IA-
227 PM CDT TUE JUN 1 2010

...THE TORNADO WARNING FOR NORTHEASTERN CLAY COUNTY WILL EXPIRE AT
230 PM CDT...

THE STORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE WARNED
AREA.

LAT...LON 4303 9506 4317 9519 4325 9491 4305 9491
TIME...MOT...LOC 1927Z 245DEG 27KT 4318 9492

$$

WILLIAMS

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 1, 1:07 PM CDTTornado WarningFSDO'Brien, Sioux23 min
Jun 1, 1:28 PM CDTTornado WarningFSDClay, O'Brien32 min
Jun 1, 2:47 PM CDTSevere Thunderstorm WarningFSDCherokee, Plymouth28 min
Jun 1, 3:37 PM CDTSevere Thunderstorm WarningFSDIda, Woodbury23 min

Nearby

Tornado Warnings in Iowa, 2010Every tornado warning in 2010Tornadoes in 2010

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.