Alert archive / South Dakota / Mesoscale Discussions in 2004

Mesoscale Discussion 646

May 11, 20049 counties in Nebraska; 15 counties in South Dakota

The Storm Prediction Center issued this mesoscale discussion at May 11, 2004, 12:27 AM MDT for 9 counties in Nebraska; 15 counties in South Dakota. It was in force for 63 min.

The area

The outline as issued.

The facts

Issued
May 11, 2004, 12:27 AM MDT (06:27 UTC)
Expired
May 11, 2004, 1:30 AM MDT
In force
63 min
Issued by
the Storm Prediction Center
All 24 counties

Arthur County, NE, Brown County, NE, Cherry County, NE, Grant County, NE, Hooker County, NE, Keya Paha County, NE, McPherson County, NE, Sheridan County, NE, Thomas County, NE, Bennett County, SD, Haakon County, SD, Hughes County, SD, Hyde County, SD, Jackson County, SD, Jones County, SD, Lyman County, SD, Mellette County, SD, Oglala Lakota County, SD, Potter County, SD, Stanley County, SD, Sully County, SD, Todd County, SD, Tripp County, SD, Ziebach County, SD

The radar

The North Platte radar (KLNX), 125 km from the middle of the area, began a volume at 06:29 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.

The nearest sounding before it

Rapid City, SD (KUNR), launched 00:00Z, 6.5 hours before the alert went out and 182 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 2004-05-11Temperature 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 00:00Z on 2004-05-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 146 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
1757 m above ground
0-6 km bulk shear
58 kt
0-1 km storm-relative helicity
146 m²/s²
0-3 km storm-relative helicity
620 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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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, 12:32 PM MDTMesoscale DiscussionSPCCherry, Dawes, Sheridan118 min
May 11, 12:55 PM MDTSevere Thunderstorm WatchSPCArthur, Cherry, Garden, Grant, Hooker, Keith and 4 more5 hr
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

Mesoscale Discussions in South Dakota, 2004Mesoscale Discussions in Nebraska, 2004Every mesoscale discussion 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.