Alert archive / South Dakota / Mesoscale Discussions in 2004

Mesoscale Discussion 651

May 11, 20044 states

The Storm Prediction Center issued this mesoscale discussion at May 11, 2004, 1:32 PM CDT for 4 states. It was in force for 118 min.

The area

The outline as issued.

The facts

Issued
May 11, 2004, 1:32 PM CDT (18:32 UTC)
Expired
May 11, 2004, 3:30 PM CDT
In force
118 min
Issued by
the Storm Prediction Center
All 43 counties

Big Stone County, MN, Grant County, MN, Stevens County, MN, Traverse County, MN, Dickey County, ND, McIntosh County, ND, Sargent County, ND, Cherry County, NE, Dawes County, NE, Sheridan County, NE, Bennett County, SD, Brown County, SD, Campbell County, SD, Clark County, SD, Codington County, SD, Corson County, SD, Day County, SD, Dewey County, SD, Edmunds County, SD, Faulk County, SD, Grant County, SD, Haakon County, SD, Hand County, SD, Hughes County, SD, Hyde County, SD, Jackson County, SD, Jones County, SD, Lyman County, SD, Marshall County, SD, McPherson County, SD, Meade County, SD, Mellette County, SD, Oglala Lakota County, SD, Pennington County, SD, Perkins County, SD, Potter County, SD, Roberts County, SD, Spink County, SD, Stanley County, SD, Sully County, SD, Todd County, SD, Walworth County, SD, Ziebach County, SD

The radar

The Rapid City radar (KUDX), 145 km from the middle of the area, began a volume at 18:32 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 watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

The nearest sounding before it

Rapid City, SD (KUNR), launched 12:00Z, 6.5 hours before the alert went out and 149 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

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 11, 3:55 PM CDTTornado WatchSPCBig Stone, Chippewa, Douglas, Grant, Kandiyohi, Lac qui Parle and 9 more5 hr
May 11, 5:37 PM CDTMesoscale DiscussionSPCBecker, Clay, Clearwater, Hubbard, Mahnomen, Norman and 5 more113 min
May 10, 8:06 PM CDTMesoscale DiscussionSPCBanner, Box Butte, Cheyenne, Dawes, Deuel, Garden and 5 more114 min
May 10, 8:30 PM CDTSevere Thunderstorm WatchSPCBanner, Kimball, Scotts Bluff5 hr
May 10, 10:19 PM CDTMesoscale DiscussionSPCBanner, Scotts Bluff, Sioux116 min
May 10, 10:45 PM CDTSevere Thunderstorm WatchSPCArthur, Box Butte, Chase, Cheyenne, Custer, Dawes and 21 more4 hr
May 11, 1:27 AM CDTMesoscale DiscussionSPCArthur, Brown, Cherry, Grant, Hooker, Keya Paha and 3 more63 min
May 11, 1:55 PM CDTSevere Thunderstorm WatchSPCArthur, Cherry, Garden, Grant, Hooker, Keith and 4 more5 hr
May 11, 2:00 PM CDTMesoscale DiscussionSPCChase, Dundy, Hayes, Hitchcock2 hr
May 11, 2:40 PM CDTTornado WatchSPCChase, Dawson, Dundy, Frontier, Furnas, Gosper and 5 more6 hr
May 11, 5:04 PM CDTMesoscale DiscussionSPCCherry, Grant, Hooker, Keya Paha116 min
May 11, 5:20 PM CDTMesoscale DiscussionSPCFrontier, Hayes, Hitchcock, Lincoln, Red Willow115 min
May 11, 6:40 PM CDTSevere Thunderstorm WatchSPCAntelope, Blaine, Boyd, Brown, Holt, Keya Paha and 5 more6 hr
May 11, 6:53 PM CDTMesoscale DiscussionSPCAurora, Beadle, Brule, Buffalo, Charles Mix, Clark and 18 more2 hr

Nearby

Mesoscale Discussions in South Dakota, 2004Mesoscale Discussions in Minnesota, 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.