Alert archive / South Dakota / Severe Thunderstorm Warnings in 2002

Severe Thunderstorm Warning 202, NWS Sioux Falls, SD

July 28, 2002Lake County, Moody County, South Dakota

NWS Sioux Falls, SD issued this severe thunderstorm warning at Jul 28, 2002, 2:21 PM CDT for Lake County, Moody County, South Dakota. It was in force for 39 min. 2 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: Jul 28, 2002, 2:21 PM CDT (19:21 UTC)
Expired: Jul 28, 2002, 3:00 PM CDT
In force: 39 min
Issued by: NWS Sioux Falls, SD
Area: Counties, with a storm outline in the text

Counties Lake County, SD, Moody County, SD

The radar

The Sioux Falls radar (KFSD), 60 km from the middle of the area, began a volume at 19:25 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
Jul 28, 2:28 PM CDT	Thunderstorm Wind 52 E	Nunda, SD
Jul 28, 3:10 PM CDT	Thunderstorm Wind 61 E	Flandreau, SD	Thunderstorm winds caused tree and power line damage, with power lines blocking roads. The amount of damage was not known.

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
Jul 28, 1:00 PM CDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Aberdeen, SD (KABR), launched 12:00Z, 7.4 hours before the alert went out and 153 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: 99 J/kg
Mixed-layer CIN: -249 J/kg
Mixed-layer LCL: 1295 m above ground
0-6 km bulk shear: 48 kt
0-1 km storm-relative helicity: 36 m²/s²
0-3 km storm-relative helicity: 255 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.4

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

696 
WUUS53 KFSD 281921
SVRFSD
SDC079-101-282000-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
220 PM CDT SUN JUL 28 2002

THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHEAST LAKE COUNTY IN EAST CENTRAL SOUTH DAKOTA
  NORTHERN MOODY COUNTY IN EAST CENTRAL SOUTH DAKOTA

* UNTIL 300 PM CDT

* AT 220 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM 4 MILES EAST OF NUNDA...OR ABOUT 13 MILES
  NORTHEAST OF MADISON...MOVING EAST AT 40 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  FLANDREAU AROUND 240 PM CDT

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

LAT...LON 4417 9705 4404 9707 4403 9645 4419 9647

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 28, 12:02 PM CDT	Severe Thunderstorm Warning	FSD	Beadle	38 min
Jul 28, 12:57 PM CDT	Severe Thunderstorm Warning	FSD	Beadle, Kingsbury	33 min
Jul 28, 1:23 PM CDT	Tornado Warning	FSD	Kingsbury	37 min
Jul 28, 1:25 PM CDT	Severe Thunderstorm Warning	FSD	Sanborn	35 min
Jul 28, 1:40 PM CDT	Severe Thunderstorm Warning	FSD	Miner	50 min
Jul 28, 1:59 PM CDT	Tornado Warning	FSD	Brookings, Kingsbury	41 min
Jul 28, 2:12 PM CDT	Tornado Warning	FSD	Brookings	48 min
Jul 28, 2:48 PM CDT	Severe Thunderstorm Warning	FSD	Lake, Moody	42 min
Jul 28, 2:59 PM CDT	Severe Thunderstorm Warning	FSD	Brookings	31 min
Jul 28, 3:19 PM CDT	Severe Thunderstorm Warning	FSD	Minnehaha	41 min
Jul 28, 3:27 PM CDT	Severe Thunderstorm Warning	FSD	Moody	33 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.