Alert archive / South Dakota / Mesoscale Discussions in 2017

Mesoscale Discussion 727

May 15, 20174 states

The Storm Prediction Center issued this mesoscale discussion at May 15, 2017, 9:53 PM MDT for 4 states. It was in force for 67 min.

The area

The outline as issued.

The facts

Issued: May 15, 2017, 9:53 PM MDT (03:53 UTC)
Expired: May 15, 2017, 11:00 PM MDT
In force: 67 min
Issued by: the Storm Prediction Center

All 26 counties

Adams County, ND, Bowman County, ND, Hettinger County, ND, Slope County, ND, Banner County, NE, Box Butte County, NE, Dawes County, NE, Morrill County, NE, Scotts Bluff County, NE, Sheridan County, NE, Sioux County, NE, Butte County, SD, Custer County, SD, Fall River County, SD, Harding County, SD, Lawrence County, SD, Meade County, SD, Oglala Lakota County, SD, Pennington County, SD, Perkins County, SD, Crook County, WY, Goshen County, WY, Laramie County, WY, Niobrara County, WY, Platte County, WY, Weston County, WY

The nearest sounding before it

Rapid City, SD (KRAP), launched 00:00Z, 3.9 hours before the alert went out and 68 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: 555 J/kg
Mixed-layer CIN: -115 J/kg
Mixed-layer LCL: 1143 m above ground
0-6 km bulk shear: 39 kt
0-1 km storm-relative helicity: 117 m²/s²
0-3 km storm-relative helicity: 177 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 3.7

Open this sounding in Storm Lab

The text

As transmitted.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 15, 6:34 PM MDT	Mesoscale Discussion	SPC	Banner, Box Butte, Dawes, Morrill, Scotts Bluff, Sheridan and 1 more	56 min
May 15, 6:41 PM MDT	Mesoscale Discussion	SPC	Burt, Butler, Colfax, Cuming, Dodge, Madison and 9 more	3 hr
May 15, 10:54 PM MDT	Severe Thunderstorm Watch	SPC	Dakota, Dixon	3 hr
May 16, 1:16 PM MDT	Mesoscale Discussion	SPC	Banner, Cheyenne, Kimball, Scotts Bluff, Sioux	119 min
May 16, 2:58 PM MDT	Mesoscale Discussion	SPC	Adams, Burt, Butler, Cass, Clay, Colfax and 33 more	2 hr
May 16, 3:57 PM MDT	Severe Thunderstorm Watch	SPC	Adams, Burt, Butler, Cass, Clay, Colfax and 33 more	7 hr
May 16, 4:47 PM MDT	Mesoscale Discussion	SPC	Arthur, Blaine, Box Butte, Brown, Chase, Cherry and 21 more	88 min
May 16, 1:13 AM MDT	Mesoscale Discussion	SPC	Clay, Hutchinson, Lincoln, McCook, Minnehaha, Moody and 3 more	92 min

Nearby

Mesoscale Discussions in South Dakota, 2017 Mesoscale Discussions in Nebraska, 2017 Mesoscale Discussions in Wyoming, 2017 Every mesoscale discussion in 2017

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.