Alert archive / North Dakota / Mesoscale Discussions in 2018

Mesoscale Discussion 915

June 28, 201824 counties in North Dakota; Campbell County, Corson County, McPherson County, South Dakota

The Storm Prediction Center issued this mesoscale discussion at Jun 28, 2018, 6:40 AM MDT for 24 counties in North Dakota; Campbell County, Corson County, McPherson County, South Dakota. It was in force for 3 hr.

The area

The outline as issued.

The facts

Issued: Jun 28, 2018, 6:40 AM MDT (12:40 UTC)
Expired: Jun 28, 2018, 9:15 AM MDT
In force: 3 hr
Issued by: the Storm Prediction Center
Chance of a watch: 40%

All 27 counties

Adams County, ND, Barnes 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, Mercer County, ND, Morton County, ND, Oliver County, ND, Ransom County, ND, Sargent County, ND, Sioux County, ND, Slope County, ND, Stark County, ND, Steele County, ND, Stutsman County, ND, Campbell County, SD, Corson County, SD, McPherson County, SD

The radar

The Bismarck radar (KBIS), 56 km from the middle of the area, began a volume at 12:41 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

Bismarck Municip, ND (KBIS), launched 12:00Z, 0.7 hours before the alert went out and 56 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: 1855 J/kg
Mixed-layer CIN: -101 J/kg
Mixed-layer LCL: 945 m above ground
0-6 km bulk shear: 52 kt
0-1 km storm-relative helicity: 90 m²/s²
0-3 km storm-relative helicity: 86 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.1

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
Jun 28, 2:52 AM MDT	Mesoscale Discussion	SPC	Barnes, Burleigh, Cass, Dickey, Emmons, Foster and 12 more	83 min
Jun 28, 12:06 PM MDT	Mesoscale Discussion	SPC	Benson, Burleigh, Eddy, Foster, Grand Forks, Griggs and 8 more	114 min
Jun 28, 12:33 PM MDT	Severe Thunderstorm Watch	SPC	Cass, Grand Forks, Steele, Traill	6 hr
Jun 28, 2:16 PM MDT	Tornado Watch	SPC	Adams, Barnes, Benson, Billings, Bowman, Burleigh and 31 more	8 hr
Jun 28, 2:35 PM MDT	Mesoscale Discussion	SPC	Billings, Bowman, Golden Valley, McKenzie, Slope	2 hr
Jun 28, 2:53 PM MDT	Mesoscale Discussion	SPC	Cass, Grand Forks, Steele, Traill	97 min
Jun 28, 4:23 PM MDT	Mesoscale Discussion	SPC	Grand Forks, Traill	97 min
Jun 28, 5:59 PM MDT	Mesoscale Discussion	SPC	Adams, Benson, Billings, Bowman, Burleigh, Dunn and 22 more	91 min
Jun 28, 3:42 PM MDT	Tornado Watch	SPC	Harding, Perkins	7 hr
Jun 28, 5:10 PM MDT	Mesoscale Discussion	SPC	Bennett, Jackson, Mellette, Oglala Lakota, Todd	2 hr

Nearby

Mesoscale Discussions in North Dakota, 2018 Mesoscale Discussions in South Dakota, 2018 Every mesoscale discussion in 2018

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.