Alert archive / South Dakota / Severe Thunderstorm Watches in 1997

Severe Thunderstorm Watch 642

July 23, 199730 counties in South Dakota

The Storm Prediction Center issued this severe thunderstorm watch at Jul 23, 1997, 8:30 PM CDT for 30 counties in South Dakota. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued
Jul 23, 1997, 8:30 PM CDT (01:30 UTC)
Expired
Jul 24, 1997, 2:00 AM CDT
In force
6 hr
Issued by
the Storm Prediction Center
All 30 counties

Aurora County, SD, Bennett County, SD, Brule County, SD, Buffalo County, SD, Campbell County, SD, Charles Mix County, SD, Corson County, SD, Dewey County, SD, Douglas County, SD, Faulk County, SD, Gregory County, SD, Haakon County, SD, Hand County, SD, Harding County, SD, Hughes County, SD, Hyde County, SD, Jackson County, SD, Jerauld County, SD, Jones County, SD, Lyman County, SD, Meade County, SD, Mellette County, SD, Perkins County, SD, Potter County, SD, Stanley County, SD, Sully County, SD, Todd County, SD, Tripp County, SD, Walworth County, SD, Ziebach County, SD

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
Jul 23, 8:37 PM CDTSevere Thunderstorm WarningABRStanley48 min
Jul 23, 8:58 PM CDTSevere Thunderstorm WarningUNRHaakon, Pennington57 min
Jul 23, 9:14 PM CDTSevere Thunderstorm WarningUNRJackson61 min
Jul 23, 9:35 PM CDTFlash Flood WarningABRStanley3 hr
Jul 23, 9:43 PM CDTSevere Thunderstorm WarningABRDewey62 min
Jul 23, 11:02 PM CDTSevere Thunderstorm WarningUNRHaakon, Pennington63 min
Jul 24, 12:09 AM CDTSevere Thunderstorm WarningABRHughes46 min
Jul 24, 12:31 AM CDTSevere Thunderstorm WarningABRHyde, Sully64 min
Jul 24, 12:44 AM CDTFlash Flood WarningABRHughes, Stanley2 hr
Jul 24, 12:49 AM CDTSevere Thunderstorm WarningABRHand61 min

The nearest sounding before it

Aberdeen, SD (KABR), launched 00:00Z, 1.5 hours before the alert went out and 165 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 1997-07-24Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2898 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 1997-07-24The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 34 square meters per square second.193958Sfc1 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
2898 J/kg
Mixed-layer CIN
-60 J/kg
Mixed-layer LCL
870 m above ground
0-6 km bulk shear
38 kt
0-1 km storm-relative helicity
34 m²/s²
0-3 km storm-relative helicity
67 m²/s²
Significant tornado parameter
0.5
Supercell composite
2.5

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
Jul 24, 2:00 AM CDTSevere Thunderstorm WatchSPCBeadle, Brookings, Brown, Buffalo, Clark, Codington and 18 more5 hr
Jul 24, 4:30 PM CDTTornado WatchSPCBon Homme, Charles Mix, Clay, Douglas, Hutchinson, Lincoln and 5 more6 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.