Alert archive / South Dakota / Severe Thunderstorm Watches in 1997

Severe Thunderstorm Watch 682

August 13, 199713 counties in South Dakota

The Storm Prediction Center issued this severe thunderstorm watch at Aug 13, 1997, 3:50 PM MDT for 13 counties in South Dakota. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued
Aug 13, 1997, 3:50 PM MDT (21:50 UTC)
Expired
Aug 13, 1997, 9:00 PM MDT
In force
5 hr
Issued by
the Storm Prediction Center

Counties Bennett County, SD, Custer County, SD, Fall River County, SD, Haakon County, SD, Hughes County, SD, Jackson County, SD, Jones County, SD, Lawrence County, SD, Mellette County, SD, Oglala Lakota County, SD, Pennington County, SD, Stanley County, SD, Todd County, SD

The radar

The Rapid City radar (KUDX), 43 km from the middle of the area, began a volume at 21:53 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

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

IssuedProductOfficeCountiesLasted
Aug 13, 3:58 PM MDTTornado WarningUNRMellette32 min
Aug 13, 4:11 PM MDTSevere Thunderstorm WarningUNRJackson64 min
Aug 13, 4:24 PM MDTSevere Thunderstorm WarningABRJones66 min
Aug 13, 4:25 PM MDTSevere Thunderstorm WarningUNRPennington50 min
Aug 13, 4:31 PM MDTSevere Thunderstorm WarningUNRMellette49 min
Aug 13, 4:38 PM MDTSevere Thunderstorm WarningUNRHaakon47 min
Aug 13, 4:44 PM MDTSevere Thunderstorm WarningABRStanley46 min
Aug 13, 6:01 PM MDTSevere Thunderstorm WarningABRHughes34 min
Aug 13, 6:16 PM MDTSevere Thunderstorm WarningABRJones34 min
Aug 13, 6:54 PM MDTSevere Thunderstorm WarningABRJones, Lyman31 min
Aug 13, 6:55 PM MDTSevere Thunderstorm WarningUNRMellette45 min

The nearest sounding before it

Rapid City, SD (KUNR), launched 12:00Z, 9.8 hours before the alert went out and 43 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, Rapid City, SD at 12:00Z on 1997-08-13Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 37 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, Rapid City, SD at 12:00Z on 1997-08-13The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 178 square meters per square second.19395878Sfc1 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
37 J/kg
Mixed-layer CIN
-147 J/kg
Mixed-layer LCL
1364 m above ground
0-6 km bulk shear
50 kt
0-1 km storm-relative helicity
178 m²/s²
0-3 km storm-relative helicity
241 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

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.

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.