Alert archive / South Dakota / Mesoscale Discussions in 2013

Mesoscale Discussion 800

May 25, 20139 counties in Montana; 9 counties in North Dakota; 22 counties in South Dakota

The Storm Prediction Center issued this mesoscale discussion at May 25, 2013, 7:48 PM MDT for 9 counties in Montana; 9 counties in North Dakota; 22 counties in South Dakota. It was in force for 87 min.

The area

The outline as issued.

The facts

Issued: May 25, 2013, 7:48 PM MDT (01:48 UTC)
Expired: May 25, 2013, 9:15 PM MDT
In force: 87 min
Issued by: the Storm Prediction Center

All 40 counties

Carter County, MT, Custer County, MT, Dawson County, MT, Fallon County, MT, McCone County, MT, Prairie County, MT, Richland County, MT, Rosebud County, MT, Wibaux County, MT, Adams County, ND, Bowman County, ND, Emmons County, ND, Golden Valley County, ND, Grant County, ND, Hettinger County, ND, Morton County, ND, Sioux County, ND, Slope County, ND, Buffalo County, SD, Butte County, SD, Campbell County, SD, Corson County, SD, Dewey County, SD, Haakon County, SD, Harding County, SD, Hughes County, SD, Hyde County, SD, Jackson County, SD, Jones County, SD, Lyman County, SD, Meade County, SD, Mellette County, SD, Pennington County, SD, Perkins County, SD, Potter County, SD, Stanley County, SD, Sully County, SD, Todd County, SD, Walworth County, SD, Ziebach County, SD

The radar

The Rapid City radar (KUDX), 200 km from the middle of the area, began a volume at 01:52 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, 1.8 hours before the alert went out and 205 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 820 J/kg
Mixed-layer CIN: -65 J/kg
Mixed-layer LCL: 2316 m above ground
0-6 km bulk shear: 58 kt
0-1 km storm-relative helicity: 114 m²/s²
0-3 km storm-relative helicity: 283 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 9.1

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.

Issued	Product	Office	Counties	Lasted
May 26, 2:44 PM MDT	Mesoscale Discussion	SPC	Fergus, Garfield, Golden Valley, Judith Basin, Meagher, Musselshell and 5 more	91 min
May 26, 3:47 PM MDT	Severe Thunderstorm Watch	SPC	Big Horn, Custer, Fergus, Garfield, Golden Valley, Musselshell and 5 more	6 hr
May 25, 9:59 PM MDT	Mesoscale Discussion	SPC	Aurora, Beadle, Bon Homme, Brule, Buffalo, Charles Mix and 28 more	91 min
May 26, 12:17 AM MDT	Severe Thunderstorm Watch	SPC	Buffalo, Corson, Dewey, Edmunds, Faulk, Haakon and 12 more	5 hr
May 26, 2:24 AM MDT	Mesoscale Discussion	SPC	Beadle, Brule, Buffalo, Corson, Dewey, Faulk and 10 more	96 min
May 26, 2:49 PM MDT	Mesoscale Discussion	SPC	Custer, Fall River, Lawrence	56 min

Nearby

Mesoscale Discussions in South Dakota, 2013 Mesoscale Discussions in Montana, 2013 Mesoscale Discussions in North Dakota, 2013 Every mesoscale discussion in 2013

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.