Alert archive / Nebraska / Severe Thunderstorm Watches in 2004

Severe Thunderstorm Watch 238

May 21, 20044 states

The Storm Prediction Center issued this severe thunderstorm watch at May 21, 2004, 2:05 PM MDT for 4 states. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued
May 21, 2004, 2:05 PM MDT (20:05 UTC)
Expired
May 21, 2004, 7:00 PM MDT
In force
5 hr
Issued by
the Storm Prediction Center
All 29 counties

Carter County, MT, Arthur County, NE, Banner County, NE, Box Butte County, NE, Cheyenne County, NE, Dawes County, NE, Deuel County, NE, Garden County, NE, Grant County, NE, Keith County, NE, Kimball County, NE, Morrill County, NE, Scotts Bluff County, NE, Sheridan County, NE, Sioux County, NE, Bennett County, SD, Butte County, SD, Custer County, SD, Fall River County, SD, Harding County, SD, Jackson County, SD, Lawrence County, SD, Meade County, SD, Oglala Lakota County, SD, Pennington County, SD, Perkins County, SD, Crook County, WY, Niobrara County, WY, Weston County, WY

The radar

The Rapid City radar (KUDX), 20 km from the middle of the area, began a volume at 20:04 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

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

IssuedProductOfficeCountiesLasted
May 21, 2:11 PM MDTSevere Thunderstorm WarningUNRMeade64 min
May 21, 2:59 PM MDTSevere Thunderstorm WarningUNRWeston46 min
May 21, 3:03 PM MDTSevere Thunderstorm WarningLBFSheridan42 min
May 21, 3:11 PM MDTSevere Thunderstorm WarningUNRMeade64 min
May 21, 3:15 PM MDTSevere Thunderstorm WarningUNRCampbell, Crook60 min
May 21, 3:26 PM MDTSevere Thunderstorm WarningCYSBanner, Morrill64 min
May 21, 3:31 PM MDTSevere Thunderstorm WarningUNRBennett59 min
May 21, 3:45 PM MDTSevere Thunderstorm WarningLBFSheridan60 min
May 21, 3:48 PM MDTSevere Thunderstorm WarningUNRPennington57 min
May 21, 4:13 PM MDTSevere Thunderstorm WarningUNRMeade32 min
May 21, 4:18 PM MDTSevere Thunderstorm WarningCYSMorrill57 min
May 21, 4:42 PM MDTSevere Thunderstorm WarningLBFGarden63 min
May 21, 4:52 PM MDTSevere Thunderstorm WarningUNRPennington53 min
May 21, 5:02 PM MDTSevere Thunderstorm WarningUNRMeade58 min
May 21, 5:37 PM MDTSevere Thunderstorm WarningUNRHaakon, Jackson38 min
May 21, 5:57 PM MDTSevere Thunderstorm WarningUNRPennington48 min
May 21, 6:40 PM MDTSevere Thunderstorm WarningUNRPennington35 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, 8.1 hours before the alert went out and 14 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 2004-05-21Temperature 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 2004-05-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 145 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
641 m above ground
0-6 km bulk shear
31 kt
0-1 km storm-relative helicity
145 m²/s²
0-3 km storm-relative helicity
127 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 21, 1:22 PM MDTMesoscale DiscussionSPCCarter, Powder River113 min
May 20, 9:03 PM MDTMesoscale DiscussionSPCAdams, Buffalo, Burt, Butler, Cass, Chase and 44 more87 min
May 20, 9:30 PM MDTSevere Thunderstorm WatchSPCAdams, Buffalo, Butler, Chase, Clay, Colfax and 32 more6 hr
May 21, 12:11 AM MDTMesoscale DiscussionSPCAntelope, Arthur, Blaine, Boone, Boyd, Brown and 29 more34 min
May 21, 12:20 AM MDTSevere Thunderstorm WatchSPCAntelope, Boone, Boyd, Burt, Cedar, Colfax and 18 more6 hr
May 21, 1:22 AM MDTMesoscale DiscussionSPCAntelope, Boone, Boyd, Burt, Cedar, Cuming and 11 more23 min
May 21, 3:57 PM MDTMesoscale DiscussionSPCBlaine, Brown, Cherry, Hooker, Keya Paha, Logan and 2 more93 min
May 21, 4:35 PM MDTMesoscale DiscussionSPCAdams, Antelope, Boone, Buffalo, Burt, Butler and 35 more115 min
May 21, 5:33 PM MDTMesoscale DiscussionSPCAdams, Antelope, Boone, Boyd, Buffalo, Burt and 44 more57 min

Nearby

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