Alert archive / North Dakota / Mesoscale Discussions in 2020

Mesoscale Discussion 1052

June 29, 20204 states

The Storm Prediction Center issued this mesoscale discussion at Jun 29, 2020, 2:44 PM MDT for 4 states. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Jun 29, 2020, 2:44 PM MDT (20:44 UTC)
Expired: Jun 29, 2020, 4:45 PM MDT
In force: 2 hr
Issued by: the Storm Prediction Center
Concerning: Severe potential...watch possible
Chance of a watch: 60%

Counties Carter County, MT, Fallon County, MT, Wibaux County, MT, Billings County, ND, Bowman County, ND, Dunn County, ND, Golden Valley County, ND, Hettinger County, ND, McKenzie County, ND, Mountrail County, ND, Slope County, ND, Stark County, ND, Williams County, ND, Butte County, SD, Harding County, SD, Lawrence County, SD, Crook County, WY

The radar

The Rapid City radar (KUDX), 219 km from the middle of the area, began a volume at 20:45 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.

Tornado Watch 318Jun 29, 3:55 PM MDT

The nearest sounding before it

Bismarck Municip, ND (KBIS), launched 12:00Z, 8.7 hours before the alert went out and 248 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: 43 J/kg
Mixed-layer CIN: -458 J/kg
Mixed-layer LCL: 1633 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: 1 m²/s²
0-3 km storm-relative helicity: 77 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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 29, 3:56 PM MDT	Tornado Watch	SPC	Carter, Custer, Dawson, Fallon, McCone, Powder River and 5 more	8 hr
Jun 28, 8:55 PM MDT	Severe Thunderstorm Watch	SPC	Burleigh, Emmons, Kidder, Logan, McIntosh, Morton and 3 more	3 hr
Jun 28, 10:16 PM MDT	Mesoscale Discussion	SPC	Emmons, Kidder, Logan, McIntosh	119 min
Jun 28, 7:09 PM MDT	Mesoscale Discussion	SPC	Campbell, Corson, Dewey, Perkins, Potter, Walworth and 1 more	66 min
Jun 28, 7:55 PM MDT	Severe Thunderstorm Watch	SPC	Campbell, Corson, Dewey, Edmunds, Faulk, Hughes and 6 more	6 hr

Nearby

Mesoscale Discussions in North Dakota, 2020 Mesoscale Discussions in Montana, 2020 Mesoscale Discussions in South Dakota, 2020 Every mesoscale discussion in 2020

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.