Alert archive / South Dakota / Severe Thunderstorm Watches in 2004

Severe Thunderstorm Watch 184

May 11, 200410 counties in Nebraska; 13 counties in South Dakota

The Storm Prediction Center issued this severe thunderstorm watch at May 11, 2004, 12:55 PM MDT for 10 counties in Nebraska; 13 counties in South Dakota. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued
May 11, 2004, 12:55 PM MDT (18:55 UTC)
Expired
May 11, 2004, 6:00 PM MDT
In force
5 hr
Issued by
the Storm Prediction Center
All 23 counties

Arthur County, NE, Cherry County, NE, Garden County, NE, Grant County, NE, Hooker County, NE, Keith County, NE, Logan County, NE, McPherson County, NE, Sheridan County, NE, Thomas County, NE, Bennett County, SD, Campbell County, SD, Corson County, SD, Dewey County, SD, Haakon County, SD, Jackson County, SD, Jones County, SD, Mellette County, SD, Stanley County, SD, Sully County, SD, Todd County, SD, Walworth County, SD, Ziebach County, SD

The radar

The North Platte radar (KLNX), 145 km from the middle of the area, began a volume at 18:56 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

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

IssuedProductOfficeCountiesLasted
May 11, 2:08 PM MDTSevere Thunderstorm WarningLBFSheridan37 min
May 11, 2:58 PM MDTSevere Thunderstorm WarningUNRHaakon, Jackson62 min
May 11, 3:16 PM MDTSevere Thunderstorm WarningABRDewey44 min
May 11, 3:31 PM MDTSevere Thunderstorm WarningLBFCherry, Sheridan44 min
May 11, 4:07 PM MDTSevere Thunderstorm WarningABRDewey38 min
May 11, 4:16 PM MDTSevere Thunderstorm WarningLBFCherry44 min
May 11, 4:55 PM MDTSevere Thunderstorm WarningABRCampbell, McPherson35 min
May 11, 4:58 PM MDTSevere Thunderstorm WarningABRWalworth47 min
May 11, 5:03 PM MDTSevere Thunderstorm WarningABRSully27 min
May 11, 5:07 PM MDTSevere Thunderstorm WarningABRJones, Lyman38 min
May 11, 5:31 PM MDTSevere Thunderstorm WarningABRCampbell, McPherson44 min
May 11, 5:41 PM MDTSevere Thunderstorm WarningABRWalworth34 min
May 11, 5:41 PM MDTSevere Thunderstorm WarningUNRTodd64 min
May 11, 5:46 PM MDTSevere Thunderstorm WarningABRLyman, Stanley29 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, 6.9 hours before the alert went out and 156 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 2004-05-11Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 650 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 2004-05-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 73 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
650 J/kg
Mixed-layer CIN
-270 J/kg
Mixed-layer LCL
1233 m above ground
0-6 km bulk shear
26 kt
0-1 km storm-relative helicity
73 m²/s²
0-3 km storm-relative helicity
356 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
May 10, 7:06 PM MDTMesoscale DiscussionSPCBanner, Box Butte, Cheyenne, Dawes, Deuel, Garden and 5 more114 min
May 10, 7:30 PM MDTSevere Thunderstorm WatchSPCBanner, Kimball, Scotts Bluff5 hr
May 10, 9:19 PM MDTMesoscale DiscussionSPCBanner, Scotts Bluff, Sioux116 min
May 10, 9:45 PM MDTSevere Thunderstorm WatchSPCArthur, Box Butte, Chase, Cheyenne, Custer, Dawes and 21 more4 hr
May 11, 12:27 AM MDTMesoscale DiscussionSPCArthur, Brown, Cherry, Grant, Hooker, Keya Paha and 3 more63 min
May 11, 12:32 PM MDTMesoscale DiscussionSPCCherry, Dawes, Sheridan118 min
May 11, 1:00 PM MDTMesoscale DiscussionSPCChase, Dundy, Hayes, Hitchcock2 hr
May 11, 1:40 PM MDTTornado WatchSPCChase, Dawson, Dundy, Frontier, Furnas, Gosper and 5 more6 hr
May 11, 4:04 PM MDTMesoscale DiscussionSPCCherry, Grant, Hooker, Keya Paha116 min
May 11, 4:20 PM MDTMesoscale DiscussionSPCFrontier, Hayes, Hitchcock, Lincoln, Red Willow115 min
May 11, 5:40 PM MDTSevere Thunderstorm WatchSPCAntelope, Blaine, Boyd, Brown, Holt, Keya Paha and 5 more6 hr
May 11, 2:55 PM MDTTornado WatchSPCBeadle, Brown, Clark, Codington, Day, Deuel and 10 more5 hr
May 11, 4:37 PM MDTMesoscale DiscussionSPCBrown, Day, Edmunds, McPherson, Marshall, Roberts113 min
May 11, 5:53 PM MDTMesoscale DiscussionSPCAurora, Beadle, Brule, Buffalo, Charles Mix, Clark and 18 more2 hr

Nearby

Severe Thunderstorm Watches in South Dakota, 2004Severe Thunderstorm Watches in Nebraska, 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.