Alert archive / Iowa / Tornado Warnings in 2002

Tornado Warning 1, NWS Sioux Falls, SD

June 7, 2002O'Brien County, Iowa

NWS Sioux Falls, SD issued this tornado warning at Jun 7, 2002, 5:49 PM CDT for O'Brien County, Iowa. It was in force for 26 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
Jun 7, 2002, 5:49 PM CDT (22:49 UTC)
Expired
Jun 7, 2002, 6:15 PM CDT
In force
26 min
Issued by
NWS Sioux Falls, SD
Area
Counties, with a storm outline in the text

County O'Brien County, IA

The radar

The Sioux Falls radar (KFSD), 98 km from the middle of the area, began a volume at 22:50 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.

IssuedProductOfficeLasted
Jun 7, 4:00 PM CDTSevere Thunderstorm WatchSPC5 hr

The nearest sounding before it

Omaha, NE (KOAX), launched 12:00Z, 10.8 hours before the alert went out and 211 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 2002-06-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Omaha, NE at 12:00Z on 2002-06-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 82 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1517 m above ground
0-6 km bulk shear
32 kt
0-1 km storm-relative helicity
82 m²/s²
0-3 km storm-relative helicity
82 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.

000 
WFUS53 KFSD 072249
TORFSD
IAC141-072315-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
548 PM CDT FRI JUN 7 2002

THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A

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

* UNTIL 615 PM CDT

* AT 548 PM CDT...WEATHER SPOTTERS REPORTED A TORNADO 5 MILES SOUTHEAST
  OF SHELDON...MOVING EAST AT 40 MPH.

* THE TORNADO WILL BE NEAR...
  SANBORN...PRIMGHAR AROUND 550 PM CDT
  HARTLEY AROUND 600 PM CDT

IF YOU ARE IN THE PATH OF THIS TORNADO...TAKE COVER IMMEDIATELY.

LAT...LON 4321 9586 4302 9588 4306 9541 4325 9540

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 7, 5:01 PM CDTSevere Thunderstorm WarningFSDLyon, Sioux29 min
Jun 7, 5:41 PM CDTSevere Thunderstorm WarningFSDSioux34 min
Jun 7, 5:47 PM CDTSevere Thunderstorm WarningFSDPlymouth43 min
Jun 7, 5:59 PM CDTSevere Thunderstorm WarningFSDCherokee46 min
Jun 7, 6:03 PM CDTSevere Thunderstorm WarningFSDDickinson, Osceola42 min
Jun 7, 6:13 PM CDTSevere Thunderstorm WarningFSDO'Brien32 min
Jun 7, 6:29 PM CDTSevere Thunderstorm WarningFSDPlymouth46 min
Jun 7, 6:41 PM CDTSevere Thunderstorm WarningFSDWoodbury34 min
Jun 7, 6:42 PM CDTSevere Thunderstorm WarningFSDClay18 min

Nearby

Tornado Warnings in Iowa, 2002Every tornado warning in 2002Tornadoes in 2002

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.