Alert archive / South Dakota / Severe Thunderstorm Watches in 2004

Severe Thunderstorm Watch 672

July 29, 200423 counties in South Dakota

The Storm Prediction Center issued this severe thunderstorm watch at Jul 29, 2004, 3:35 PM MDT for 23 counties in South Dakota. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued
Jul 29, 2004, 3:35 PM MDT (21:35 UTC)
Expired
Jul 29, 2004, 9:00 PM MDT
In force
5 hr
Issued by
the Storm Prediction Center
All 23 counties

Bennett County, SD, Brule County, SD, Buffalo County, SD, Butte County, SD, Custer County, SD, Fall River County, SD, Gregory County, SD, Haakon County, SD, Hand County, SD, Hughes County, SD, Hyde County, SD, Jackson County, SD, Jones County, SD, Lawrence County, SD, Lyman County, SD, Meade County, SD, Mellette County, SD, Oglala Lakota County, SD, Pennington County, SD, Stanley County, SD, Sully County, SD, Todd County, SD, Tripp County, SD

The radar

The Rapid City radar (KUDX), 80 km from the middle of the area, began a volume at 21:39 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

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

IssuedProductOfficeCountiesLasted
Jul 29, 4:07 PM MDTSevere Thunderstorm WarningUNRPennington38 min
Jul 29, 4:40 PM MDTSevere Thunderstorm WarningUNRLawrence, Pennington50 min
Jul 29, 4:52 PM MDTSevere Thunderstorm WarningUNRCuster38 min
Jul 29, 4:57 PM MDTSevere Thunderstorm WarningUNRMeade48 min
Jul 29, 7:54 PM MDTSevere Thunderstorm WarningUNRBennett51 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 12:00Z, 9.6 hours before the alert went out and 85 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 2004-07-29Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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 2004-07-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 81 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1895 m above ground
0-6 km bulk shear
36 kt
0-1 km storm-relative helicity
81 m²/s²
0-3 km storm-relative helicity
114 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jul 29, 3:20 PM MDTMesoscale DiscussionSPCBennett, Butte, Custer, Dewey, Fall River, Haakon and 11 more25 min
Jul 29, 4:30 PM MDTMesoscale DiscussionSPCBennett, Brule, Buffalo, Butte, Custer, Fall River and 17 more30 min

Nearby

Severe Thunderstorm Watches in South Dakota, 2004Every severe thunderstorm watch in 2004

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.