Alert archive / Minnesota / Severe Thunderstorm Warnings in 2002

Severe Thunderstorm Warning 7, NWS Sioux Falls, SD

April 13, 2002Lincoln County, Minnesota; Brookings County, South Dakota

NWS Sioux Falls, SD issued this severe thunderstorm warning at Apr 13, 2002, 7:23 PM CDT for Lincoln County, Minnesota; Brookings County, South Dakota. It was in force for 22 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 13, 2002, 7:23 PM CDT (00:23 UTC)
Expired: Apr 13, 2002, 7:45 PM CDT
In force: 22 min
Issued by: NWS Sioux Falls, SD
Area: Counties, with a storm outline in the text

Counties Lincoln County, MN, Brookings County, SD

The radar

The Sioux Falls radar (KFSD), 102 km from the middle of the area, began a volume at 00:23 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 13, 7:25 PM CDT	Hail 0.75	White, 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 00:00Z, 0.4 hours before the alert went out and 150 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: 64 J/kg
Mixed-layer CIN: -9 J/kg
Mixed-layer LCL: 1914 m above ground
0-6 km bulk shear: 50 kt
0-1 km storm-relative helicity: 45 m²/s²
0-3 km storm-relative helicity: 161 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 140023
SVRFSD
MNC081-SDC011-140045-

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

THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHERN BROOKINGS COUNTY IN EAST CENTRAL SOUTH DAKOTA
  NORTHWESTERN LINCOLN COUNTY IN SOUTHWEST MINNESOTA

* UNTIL 745 PM CDT

* AT 721 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM 3 MILES SOUTHWEST OF HENDRICKS...OR ABOUT 19   
  MILES SOUTHWEST OF CANBY...MOVING EAST AT 20 MPH.  A SECOND SEVERE 
  STORM WAS DEVELOPING 6 MILES SOUTHWEST OF WHITE...MOVING TO THE   
  EAST AT 20 MPH.

*  THIS STORM WILL BE NEAR...
   HENDRICKS AT 730 PM CDT
   WHITE AT 735 PM CDT

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

LAT...LON 4451 9684 4436 9678 4446 9630 4459 9631
          4454 9645

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 13, 7:52 PM CDT	Severe Thunderstorm Warning	FSD	Rock	23 min
Apr 13, 7:14 PM CDT	Severe Thunderstorm Warning	FSD	Minnehaha	16 min

Nearby

Severe Thunderstorm Warnings in Minnesota, 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.