Alert archive / South Dakota / Severe Thunderstorm Watches in 1997

Severe Thunderstorm Watch 484

June 20, 199737 counties in South Dakota

The Storm Prediction Center issued this severe thunderstorm watch at Jun 20, 1997, 12:00 AM CDT for 37 counties in South Dakota. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued
Jun 20, 1997, 12:00 AM CDT (05:00 UTC)
Expired
Jun 20, 1997, 5:00 AM CDT
In force
5 hr
Issued by
the Storm Prediction Center
All 37 counties

Aurora County, SD, Beadle County, SD, Bennett County, SD, Bon Homme County, SD, Brookings County, SD, Brule County, SD, Buffalo County, SD, Charles Mix County, SD, Davison County, SD, Douglas County, SD, Gregory County, SD, Haakon County, SD, Hamlin County, SD, Hand County, SD, Hanson County, SD, Hughes County, SD, Hutchinson County, SD, Hyde County, SD, Jackson County, SD, Jerauld County, SD, Jones County, SD, Kingsbury County, SD, Lake County, SD, Lincoln County, SD, Lyman County, SD, McCook County, SD, Mellette County, SD, Miner County, SD, Minnehaha County, SD, Moody County, SD, Sanborn County, SD, Stanley County, SD, Sully County, SD, Todd County, SD, Tripp County, SD, Turner County, SD, Yankton County, SD

The radar

The Aberdeen radar (KABR), 184 km from the middle of the area, began a volume at 05:04 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.

Warnings issued inside it

26 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

IssuedProductOfficeCountiesLasted
Jun 20, 12:25 AM CDTSevere Thunderstorm WarningFSDBeadle35 min
Jun 20, 12:55 AM CDTSevere Thunderstorm WarningUNRHaakon45 min
Jun 20, 1:13 AM CDTSevere Thunderstorm WarningABRJones, Lyman32 min
Jun 20, 1:34 AM CDTSevere Thunderstorm WarningABRStanley31 min
Jun 20, 1:51 AM CDTSevere Thunderstorm WarningUNRHaakon49 min
Jun 20, 1:53 AM CDTSevere Thunderstorm WarningABRJones47 min
Jun 20, 1:54 AM CDTSevere Thunderstorm WarningABRJones, Stanley46 min
Jun 20, 2:05 AM CDTSevere Thunderstorm WarningABRHughes, Lyman45 min
Jun 20, 2:22 AM CDTSevere Thunderstorm WarningABRJones33 min
Jun 20, 2:47 AM CDTSevere Thunderstorm WarningABRStanley28 min
Jun 20, 2:47 AM CDTSevere Thunderstorm WarningABRBuffalo, Hyde28 min
Jun 20, 2:52 AM CDTSevere Thunderstorm WarningABRHughes, Lyman63 min
Jun 20, 2:55 AM CDTSevere Thunderstorm WarningABRJones65 min
Jun 20, 3:05 AM CDTSevere Thunderstorm WarningFSDBrule45 min
Jun 20, 3:14 AM CDTSevere Thunderstorm WarningABRBuffalo31 min
Jun 20, 3:23 AM CDTSevere Thunderstorm WarningFSDTurner32 min
Jun 20, 3:40 AM CDTSevere Thunderstorm WarningFSDAurora50 min
Jun 20, 3:56 AM CDTSevere Thunderstorm WarningABRLyman49 min
Jun 20, 4:05 AM CDTSevere Thunderstorm WarningABRJones65 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, 4:45 AM CDTSevere Thunderstorm WarningFSDAurora, Douglas30 min
Jun 20, 4:45 AM CDTSevere Thunderstorm WarningUNRJackson45 min
Jun 20, 5:00 AM CDTSevere Thunderstorm WarningFSDMinnehaha30 min

The nearest sounding before it

Aberdeen, SD (KABR), launched 00:00Z, 5.0 hours before the alert went out and 140 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

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jun 19, 9:30 PM CDTSevere Thunderstorm WatchSPCBon Homme, Clay, Hanson, Hutchinson, Lincoln, McCook and 4 more5 hr
Jun 20, 5:00 AM CDTSevere Thunderstorm WatchSPCAurora, Bennett, Bon Homme, Brule, Buffalo, Charles Mix and 27 more5 hr

Nearby

Severe Thunderstorm Watches in South Dakota, 1997Every severe thunderstorm watch 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.