Alert archive / South Dakota / Severe Thunderstorm Watches in 1997

Severe Thunderstorm Watch 644

July 24, 199724 counties in South Dakota

The Storm Prediction Center issued this severe thunderstorm watch at Jul 24, 1997, 2:00 AM CDT for 24 counties in South Dakota. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued
Jul 24, 1997, 2:00 AM CDT (07:00 UTC)
Expired
Jul 24, 1997, 7:00 AM CDT
In force
5 hr
Issued by
the Storm Prediction Center
All 24 counties

Beadle County, SD, Brookings County, SD, Brown County, SD, Buffalo County, SD, Clark County, SD, Codington County, SD, Day County, SD, Deuel County, SD, Edmunds County, SD, Faulk County, SD, Grant County, SD, Hamlin County, SD, Hand County, SD, Hyde County, SD, Jerauld County, SD, Kingsbury County, SD, Lake County, SD, Marshall County, SD, McPherson County, SD, Miner County, SD, Moody County, SD, Roberts County, SD, Sanborn County, SD, Spink County, SD

The nearest sounding before it

Aberdeen, SD (KABR), launched 00:00Z, 7.0 hours before the alert went out and 56 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 23, 8:30 PM CDTSevere Thunderstorm WatchSPCAurora, Bennett, Brule, Buffalo, Campbell, Charles Mix and 24 more6 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.