Alert archive / Nebraska / Severe Thunderstorm Warnings in 2002

Severe Thunderstorm Warning 81, NWS Sioux Falls, SD

June 7, 2002Dixon County, Nebraska; Union County, South Dakota

NWS Sioux Falls, SD issued this severe thunderstorm warning at Jun 7, 2002, 5:21 PM CDT for Dixon County, Nebraska; Union County, South Dakota. It was in force for 39 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 7, 2002, 5:21 PM CDT (22:21 UTC)
Expired: Jun 7, 2002, 6:00 PM CDT
In force: 39 min
Issued by: NWS Sioux Falls, SD
Area: Counties, with a storm outline in the text

Counties Dixon County, NE, Union County, SD

The radar

The Sioux Falls radar (KFSD), 106 km from the middle of the area, began a volume at 22:24 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
Jun 7, 5:47 PM CDT	Hail 0.75	Ponca, NE

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.

The nearest sounding before it

Omaha, NE (KOAX), launched 12:00Z, 10.4 hours before the alert went out and 149 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: 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 072221
SVRFSD
NEC051-SDC127-072300-

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

THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHEAST DIXON COUNTY IN NORTHEAST NEBRASKA
  SOUTHERN UNION COUNTY IN SOUTHEAST SOUTH DAKOTA

* UNTIL 600 PM CDT

* AT 521 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM 4 MILES NORTH OF PONCA...MOVING NORTHEAST AT 25
  MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  ELK POINT AROUND 530 PM CDT
  JEFFERSON AROUND 535 PM CDT

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

LAT...LON 4266 9690 4250 9678 4259 9654 4275 9668

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 7, 6:53 PM CDT	Severe Thunderstorm Warning	FSD	Dakota, Dixon	52 min
Jun 7, 4:02 PM CDT	Severe Thunderstorm Warning	FSD	Charles Mix	28 min
Jun 7, 4:11 PM CDT	Severe Thunderstorm Warning	FSD	Bon Homme	49 min
Jun 7, 5:00 PM CDT	Severe Thunderstorm Warning	FSD	Bon Homme	30 min
Jun 7, 6:01 PM CDT	Severe Thunderstorm Warning	FSD	Union	19 min
Jun 7, 6:35 PM CDT	Severe Thunderstorm Warning	FSD	Union	25 min

Nearby

Severe Thunderstorm Warnings in Nebraska, 2002 Severe Thunderstorm Warnings in South Dakota, 2002 Every 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.