Alert archive / South Dakota / Severe Thunderstorm Watches in 2003

Severe Thunderstorm Watch 754

July 17, 20036 counties in South Dakota

The Storm Prediction Center issued this severe thunderstorm watch at Jul 17, 2003, 8:05 PM MDT for 6 counties in South Dakota. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued
Jul 17, 2003, 8:05 PM MDT (02:05 UTC)
Expired
Jul 18, 2003, 1:00 AM MDT
In force
5 hr
Issued by
the Storm Prediction Center

Counties Butte County, SD, Harding County, SD, Lawrence County, SD, Meade County, SD, Pennington County, SD, Perkins County, SD

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
Jul 17, 8:29 PM MDTSevere Thunderstorm WarningUNRHarding46 min
Jul 17, 8:53 PM MDTSevere Thunderstorm WarningUNRButte82 min
Jul 17, 9:12 PM MDTSevere Thunderstorm WarningUNRLawrence63 min

Discussions around it

SPC mesoscale discussions over the same counties from four hours before the watch to its end.

The nearest sounding before it

Rapid City, SD (KUNR), launched 00:00Z, 2.1 hours before the alert went out and 118 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 00:00Z on 2003-07-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2273 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 00:00Z on 2003-07-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -51 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
2273 J/kg
Mixed-layer CIN
-197 J/kg
Mixed-layer LCL
1551 m above ground
0-6 km bulk shear
40 kt
0-1 km storm-relative helicity
-51 m²/s²
0-3 km storm-relative helicity
-28 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.4

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jul 17, 6:19 PM MDTMesoscale DiscussionSPCBennett, Todd116 min
Jul 17, 6:41 PM MDTMesoscale DiscussionSPCHarding, Perkins, Ziebach94 min
Jul 17, 10:15 PM MDTMesoscale DiscussionSPCButte, Harding, Lawrence, Meade, Pennington, Perkins90 min
Jul 18, 3:30 PM MDTMesoscale DiscussionSPCButte, Custer, Fall River, Harding, Lawrence, Meade and 3 more90 min
Jul 18, 3:45 PM MDTSevere Thunderstorm WatchSPCButte, Custer, Fall River, Harding, Lawrence, Meade and 3 more5 hr

Nearby

Severe Thunderstorm Watches in South Dakota, 2003Every severe thunderstorm watch in 2003

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.