Alert archive / South Dakota / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 21, NWS Sioux Falls, SD

June 20, 1997Aurora County, Douglas County, South Dakota

NWS Sioux Falls, SD issued this severe thunderstorm warning at Jun 20, 1997, 4:45 AM CDT for Aurora County, Douglas County, South Dakota. It was in force for 30 min. 1 report came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued
Jun 20, 1997, 4:45 AM CDT (09:45 UTC)
Expired
Jun 20, 1997, 5:15 AM CDT
In force
30 min
Issued by
NWS Sioux Falls, SD
Area
Whole counties

Counties Aurora County, SD, Douglas County, SD

The radar

The Sioux Falls radar (KFSD), 140 km from the middle of the area, began a volume at 09:48 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

TimeReportWhereRemark
Jun 20, 5:00 AM CDTThunderstorm Wind 70Armour, 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 watch it was issued in

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

IssuedProductOfficeLasted
Jun 20, 12:00 AM CDTSevere Thunderstorm WatchSPC5 hr

The nearest sounding before it

Aberdeen, SD (KABR), launched 00:00Z, 9.8 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-pSkew-T log-p diagram, Aberdeen, SD at 00:00Z on 1997-06-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 941 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Aberdeen, SD at 00:00Z on 1997-06-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 3 square meters per square second.1939587897117Sfc1 km3 km6 km9 kmRMLM
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
941 J/kg
Mixed-layer CIN
-5 J/kg
Mixed-layer LCL
1569 m above ground
0-6 km bulk shear
57 kt
0-1 km storm-relative helicity
3 m²/s²
0-3 km storm-relative helicity
140 m²/s²
Significant tornado parameter
0.1
Supercell composite
0.7

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KFSD 200945 RRA
SVRFSD
SDC003-043-201015-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
445 AM CDT FRI JUN 20 1997

* SEVERE THUNDERSTORM WARNING FOR
  SOUTHERN AURORA COUNTY - IN SOUTHEASTERN SOUTH DAKOTA
  DOUGLAS COUNTY - IN SOUTHCENTRAL SOUTH DAKOTA

* UNTIL 515 AM CDT
 
* SOME AREAS AFFECTED
  AURORA CENTER            AROUND 455 AM CDT
  HARRISON                 AROUND 500 AM CDT

* AT 442 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  A SEVERE THUNDERSTORM 31 MILES SOUTHEAST OF CHAMBERLAIN  OR 11
  MILES WEST OF AURORA CENTER  MOVING EAST AT 35 MPH.
 
IF YOU ARE CAUGHT OUTSIDE...SEEK SHELTER FROM THE WEATHER IN A
STRONG BUILDING.  DAMAGING WINDS AND LARGE HAIL OCCUR WITH SEVERE
THUNDERSTORMS.  STAY INSIDE AWAY FROM WINDOWS UNTIL THE STORM HAS
PASSED.

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 19, 9:06 PM CDTSevere Thunderstorm WarningFSDHutchinson, Turner34 min
Jun 19, 9:39 PM CDTSevere Thunderstorm WarningFSDMcCook, Minnehaha, Turner31 min
Jun 19, 9:39 PM CDTSevere Thunderstorm WarningFSDLincoln31 min
Jun 19, 11:13 PM CDTSevere Thunderstorm WarningFSDBrule32 min
Jun 19, 11:46 PM CDTSevere Thunderstorm WarningFSDBrule34 min
Jun 19, 11:49 PM CDTSevere Thunderstorm WarningFSDBeadle, Jerauld31 min
Jun 20, 12:25 AM CDTSevere Thunderstorm WarningFSDBeadle35 min
Jun 20, 3:05 AM CDTSevere Thunderstorm WarningFSDBrule45 min
Jun 20, 3:23 AM CDTSevere Thunderstorm WarningFSDTurner32 min
Jun 20, 3:40 AM CDTSevere Thunderstorm WarningFSDAurora50 min
Jun 20, 4:05 AM CDTSevere Thunderstorm WarningFSDBrule35 min
Jun 20, 4:13 AM CDTSevere Thunderstorm WarningFSDDavison32 min
Jun 20, 4:32 AM CDTSevere Thunderstorm WarningFSDHanson33 min
Jun 20, 4:41 AM CDTSevere Thunderstorm WarningFSDBrule19 min
Jun 20, 5:00 AM CDTSevere Thunderstorm WarningFSDMinnehaha30 min
Jun 20, 5:14 AM CDTSevere Thunderstorm WarningFSDTurner31 min
Jun 20, 5:19 AM CDTSevere Thunderstorm WarningFSDDouglas, Hutchinson36 min
Jun 20, 5:32 AM CDTSevere Thunderstorm WarningFSDLincoln, Minnehaha33 min
Jun 20, 5:59 AM CDTSevere Thunderstorm WarningFSDHutchinson, Yankton31 min
Jun 20, 6:38 AM CDTSevere Thunderstorm WarningFSDLincoln, Union32 min

Nearby

Severe Thunderstorm Warnings in South Dakota, 1997Every severe thunderstorm warning in 1997

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.