Alert archive / South Dakota / Mesoscale Discussions in 2005

Mesoscale Discussion 946

May 20, 20057 counties in Minnesota; 26 counties in North Dakota; 31 counties in South Dakota

The Storm Prediction Center issued this mesoscale discussion at May 20, 2005, 11:37 PM CDT for 7 counties in Minnesota; 26 counties in North Dakota; 31 counties in South Dakota. It was in force for 83 min.

The area

The outline as issued.

The facts

Issued
May 20, 2005, 11:37 PM CDT (04:37 UTC)
Expired
May 21, 2005, 1:00 AM CDT
In force
83 min
Issued by
the Storm Prediction Center
All 64 counties

Clay County, MN, Mahnomen County, MN, Norman County, MN, Pennington County, MN, Polk County, MN, Red Lake County, MN, Wilkin County, MN, Adams County, ND, Barnes County, ND, Bowman County, ND, Burleigh County, ND, Cass County, ND, Dickey County, ND, Emmons County, ND, Foster County, ND, Grant County, ND, Griggs County, ND, Hettinger County, ND, Kidder County, ND, LaMoure County, ND, Logan County, ND, McIntosh County, ND, Morton County, ND, Oliver County, ND, Ransom County, ND, Richland County, ND, Sargent County, ND, Sioux County, ND, Slope County, ND, Stark County, ND, Steele County, ND, Stutsman County, ND, Traill County, ND, Aurora County, SD, Beadle County, SD, Brown County, SD, Brule County, SD, Buffalo County, SD, Campbell County, SD, Clark County, SD, Codington County, SD, Corson County, SD, Davison County, SD, Day County, SD, Edmunds County, SD, Faulk County, SD, Hamlin County, SD, Hand County, SD, Hanson County, SD, Harding County, SD, Hyde County, SD, Jerauld County, SD, Kingsbury County, SD, Lake County, SD, Marshall County, SD, McCook County, SD, McPherson County, SD, Miner County, SD, Minnehaha County, SD, Perkins County, SD, Potter County, SD, Sanborn County, SD, Spink County, SD, Walworth County, SD

The radar

The Aberdeen radar (KABR), 99 km from the middle of the area, began a volume at 04:40 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

Aberdeen, SD (KABR), launched 00:00Z, 4.6 hours before the alert went out and 135 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, Aberdeen, SD at 00:00Z on 2005-05-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 395 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, Aberdeen, SD at 00:00Z on 2005-05-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -51 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
395 J/kg
Mixed-layer CIN
-83 J/kg
Mixed-layer LCL
2239 m above ground
0-6 km bulk shear
48 kt
0-1 km storm-relative helicity
-51 m²/s²
0-3 km storm-relative helicity
4 m²/s²
Significant tornado parameter
0.0
Supercell composite
-0.4

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 21, 1:08 AM CDTMesoscale DiscussionSPCBig Stone, Clay, Grant, Lac qui Parle, Stevens, Traverse and 1 more97 min
May 21, 1:35 AM CDTSevere Thunderstorm WatchSPCBecker, Clay, Mahnomen, Marshall, Norman, Pennington and 3 more7 hr
May 21, 4:52 AM CDTMesoscale DiscussionSPCBecker, Clay, Mahnomen, Marshall, Norman, Pennington and 3 more83 min
May 21, 7:43 AM CDTMesoscale DiscussionSPCBecker, Clay, Mahnomen, Marshall, Norman, Pennington and 3 more62 min
May 21, 1:24 PM CDTMesoscale DiscussionSPCBecker, Clay, Clearwater, Kittson, Mahnomen, Marshall and 7 more66 min
May 21, 3:15 PM CDTSevere Thunderstorm WatchSPCBecker, Beltrami, Cass, Clay, Clearwater, Crow Wing and 13 more6 hr
May 20, 9:30 PM CDTSevere Thunderstorm WatchSPCMcKenzie, Williams5 hr
May 20, 10:45 PM CDTMesoscale DiscussionSPCMcKenzie, Williams2 hr
May 21, 3:50 PM CDTMesoscale DiscussionSPCBottineau, Cavalier, McHenry, Pierce, Ramsey, Renville and 2 more115 min
May 21, 5:00 PM CDTTornado WatchSPCClay, Union5 hr

Nearby

Mesoscale Discussions in South Dakota, 2005Mesoscale Discussions in North Dakota, 2005Mesoscale Discussions in Minnesota, 2005Every mesoscale discussion in 2005

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.