Alert archive / South Dakota / Severe Thunderstorm Warnings in 2002

Severe Thunderstorm Warning 1, NWS Sioux Falls, SD

April 13, 2002McCook County, Turner County, South Dakota

NWS Sioux Falls, SD issued this severe thunderstorm warning at Apr 13, 2002, 5:02 PM CDT for McCook County, Turner County, South Dakota. It was in force for 28 min. 4 reports 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 13, 2002, 5:02 PM CDT (22:02 UTC)
Expired: Apr 13, 2002, 5:30 PM CDT
In force: 28 min
Issued by: NWS Sioux Falls, SD
Area: Counties, with a storm outline in the text

Counties McCook County, SD, Turner County, SD

The radar

The Sioux Falls radar (KFSD), 49 km from the middle of the area, began a volume at 22:03 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
Apr 13, 5:05 PM CDT	Hail 0.88	Dolton, SD
Apr 13, 5:15 PM CDT	Hail 0.75	Canistota, SD
Apr 13, 5:25 PM CDT	Hail 0.88	Canistota, SD
Apr 13, 5:33 PM CDT	Hail 0.75	Canistota, SD

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

Aberdeen, SD (KABR), launched 12:00Z, 10.0 hours before the alert went out and 179 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: 21 J/kg
Mixed-layer CIN: -342 J/kg
Mixed-layer LCL: 1564 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: 72 m²/s²
0-3 km storm-relative helicity: 89 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 132202
SVRFSD
SDC087-125-132230-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
501 PM CDT SAT APR 13 2002

THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHERN MCCOOK COUNTY IN SOUTHEAST SOUTH DAKOTA
  NORTHERN TURNER COUNTY IN SOUTHEAST SOUTH DAKOTA

* UNTIL 530 PM CDT

* AT 501 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM 6 MILES NORTHWEST OF MARION...MOVING NORTHEAST
  AT 15 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  MARION AROUND 510 PM CDT
  MONROE AROUND 525 PM CDT

SPOTTERS REPORTED 1.5 INCH HAIL HAD OCCURRED IN DOLTON AROUND 455 PM 
CDT.

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

LAT...LON 4351 9741 4340 9740 4342 9717 4359 9720

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 13, 5:30 PM CDT	Severe Thunderstorm Warning	FSD	McCook	15 min
Apr 13, 6:23 PM CDT	Severe Thunderstorm Warning	FSD	Minnehaha	22 min
Apr 13, 6:26 PM CDT	Severe Thunderstorm Warning	FSD	Brookings	34 min
Apr 13, 6:43 PM CDT	Severe Thunderstorm Warning	FSD	Minnehaha	32 min

Nearby

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.