Alert archive / North Dakota / Mesoscale Discussions in 2018

Mesoscale Discussion 894

June 26, 2018Carter County, Fallon County, Montana; 14 counties in North Dakota; Harding County, Perkins County, South Dakota

The Storm Prediction Center issued this mesoscale discussion at Jun 26, 2018, 2:35 PM MDT for Carter County, Fallon County, Montana; 14 counties in North Dakota; Harding County, Perkins County, South Dakota. It was in force for 85 min.

The area

The outline as issued.

The facts

Issued: Jun 26, 2018, 2:35 PM MDT (20:35 UTC)
Expired: Jun 26, 2018, 4:00 PM MDT
In force: 85 min
Issued by: the Storm Prediction Center
Chance of a watch: 80%

Counties Carter County, MT, Fallon County, MT, Adams County, ND, Billings County, ND, Bowman County, ND, Dunn County, ND, Golden Valley County, ND, Hettinger County, ND, McLean County, ND, Mercer County, ND, Mountrail County, ND, Oliver County, ND, Renville County, ND, Slope County, ND, Stark County, ND, Ward County, ND, Harding County, SD, Perkins County, SD

The radar

The Bismarck radar (KBIS), 148 km from the middle of the area, began a volume at 20:35 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.

Severe Thunderstorm Watch 225Jun 26, 3:00 PM MDT

The nearest sounding before it

Bismarck Municip, ND (KBIS), launched 12:00Z, 8.6 hours before the alert went out and 153 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: 6 J/kg
Mixed-layer CIN: -79 J/kg
Mixed-layer LCL: 740 m above ground
0-6 km bulk shear: 21 kt
0-1 km storm-relative helicity: 12 m²/s²
0-3 km storm-relative helicity: 86 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 26, 3:00 PM MDT	Severe Thunderstorm Watch	SPC	Adams, Billings, Bottineau, Bowman, Burke, Dunn and 16 more	9 hr
Jun 26, 5:46 PM MDT	Mesoscale Discussion	SPC	Adams, Billings, Bottineau, Bowman, Burke, Dunn and 8 more	59 min

Nearby

Mesoscale Discussions in North Dakota, 2018 Mesoscale Discussions in Montana, 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.