Alert archive / South Dakota / Severe Thunderstorm Warnings in 2002

Severe Thunderstorm Warning 13, NWS Sioux Falls, SD

April 16, 2002Clay County, Union County, South Dakota; Dixon County, Nebraska

NWS Sioux Falls, SD issued this severe thunderstorm warning at Apr 16, 2002, 5:54 PM CDT for Clay County, Union County, South Dakota; Dixon County, Nebraska. It was in force for 36 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: Apr 16, 2002, 5:54 PM CDT (22:54 UTC)
Expired: Apr 16, 2002, 6:30 PM CDT
In force: 36 min
Issued by: NWS Sioux Falls, SD
Area: Counties, with a storm outline in the text

Counties Dixon County, NE, Clay County, SD, Union County, SD

The radar

The Sioux Falls radar (KFSD), 115 km from the middle of the area, began a volume at 22:57 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
Apr 16, 6:09 PM CDT	Hail 0.75	Newcastle, 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Apr 16, 4:00 PM CDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Omaha, NE (KOAX), launched 12:00Z, 10.9 hours before the alert went out and 145 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: 1529 J/kg
Mixed-layer CIN: -420 J/kg
Mixed-layer LCL: 789 m above ground
0-6 km bulk shear: 35 kt
0-1 km storm-relative helicity: 404 m²/s²
0-3 km storm-relative helicity: 417 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 162254
SVRFSD
NEC051-SDC027-127-162330-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
554 PM CDT TUE APR 16 2002

THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A

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

* UNTIL 630 PM CDT

* AT 554 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM 6 MILES WEST OF ALLEN...OR ABOUT 7 MILES EAST
  OF LAUREL...MOVING NORTH AT 40 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  NEWCASTLE AROUND 610 PM CDT
  VERMILLION AROUND 625 PM CDT

AT 550 PM CDT...DIME SIZE HAIL WAS REPORTED BY THE SHERIFF IN DIXON.

THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH YOU SHOULD PREPARE
FOR DAMAGING WINDS IN EXCESS OF 58 MPH...LARGE HAIL...HEAVY RAINS AND
DEADLY LIGHTNING. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER...
PREFERABLY INSIDE A STRONG BUILDING BUT AWAY FROM WINDOWS.

THIS STORM HAS A HISTORY OF PRODUCING LARGE HAIL. GO INSIDE A STURDY
BUILDING AND STAY AWAY FROM WINDOWS.

LAT...LON 4239 9702 4233 9688 4281 9662 4288 9698

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 16, 5:23 PM CDT	Severe Thunderstorm Warning	FSD	Lake, Minnehaha, Moody, Turner	22 min
Apr 16, 5:45 PM CDT	Severe Thunderstorm Warning	FSD	Minnehaha, Moody	45 min
Apr 16, 5:46 PM CDT	Severe Thunderstorm Warning	FSD	Turner	29 min
Apr 16, 5:52 PM CDT	Severe Thunderstorm Warning	FSD	Lake	23 min
Apr 16, 5:56 PM CDT	Severe Thunderstorm Warning	FSD	Brookings	34 min
Apr 16, 6:27 PM CDT	Severe Thunderstorm Warning	FSD	Minnehaha, Moody	33 min
Apr 16, 6:28 PM CDT	Severe Thunderstorm Warning	FSD	Union	47 min
Apr 16, 6:41 PM CDT	Severe Thunderstorm Warning	FSD	Brookings	34 min

Nearby

Severe Thunderstorm Warnings in South Dakota, 2002 Severe Thunderstorm Warnings in Nebraska, 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.