Alert archive / Iowa / Severe Thunderstorm Warnings in 2002

Severe Thunderstorm Warning 90, NWS Sioux Falls, SD

June 7, 2002Woodbury County, Iowa

NWS Sioux Falls, SD issued this severe thunderstorm warning at Jun 7, 2002, 6:41 PM CDT for Woodbury County, Iowa. It was in force for 34 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, 6:41 PM CDT (23:41 UTC)
Expired
Jun 7, 2002, 7:15 PM CDT
In force
34 min
Issued by
NWS Sioux Falls, SD
Area
Counties, with a storm outline in the text

County Woodbury County, IA

The radar

The Sioux Falls radar (KFSD), 128 km from the middle of the area, began a volume at 23:45 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 nearest sounding before it

Omaha, NE (KOAX), launched 12:00Z, 11.7 hours before the alert went out and 133 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 
WUUS53 KFSD 072341
SVRFSD
IAC193-080015-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
641 PM CDT FRI JUN 7 2002

THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHERN WOODBURY COUNTY IN NORTHWEST IOWA

* UNTIL 715 PM CDT

* AT 641 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS FROM 7 MILES NORTHWEST OF LAWTON TO 9
  MILES WEST OF SIOUX CITY...OR FROM 9 MILES NORTHEAST OF SIOUX CITY
  TO 4 MILES WEST OF NORTH SIOUX CITY...MOVING EAST AT 20 MPH.

* SEVERE THUNDERSTORMS WILL BE NEAR...
  SIOUX CITY AROUND 655 PM CDT
  MOVILLE...LAWTON AROUND 715 PM CDT

THIS STORM WILL PRODUCE LARGE HAIL. GO INSIDE A STURDY BUILDING AND
STAY AWAY FROM WINDOWS.

LAT...LON 4256 9617 4253 9651 4241 9635 4247 9575

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, 5:49 PM CDTTornado WarningFSDO'Brien26 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, 6:42 PM CDTSevere Thunderstorm WarningFSDClay18 min

Nearby

Severe Thunderstorm Warnings in Iowa, 2002Every severe thunderstorm warning 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.