Alert archive / North Dakota / Mesoscale Discussions in 2018

Mesoscale Discussion 738

June 14, 20186 counties in North Dakota

The Storm Prediction Center issued this mesoscale discussion at Jun 14, 2018, 7:54 PM CDT for 6 counties in North Dakota. It was in force for 96 min.

The area

The outline as issued.

The facts

Issued: Jun 14, 2018, 7:54 PM CDT (00:54 UTC)
Expired: Jun 14, 2018, 9:30 PM CDT
In force: 96 min
Issued by: the Storm Prediction Center
Chance of a watch: 80%

Counties Benson County, ND, Cavalier County, ND, Pembina County, ND, Ramsey County, ND, Towner County, ND, Walsh County, ND

The radar

The Fargo/Grand Forks radar (KMVX), 155 km from the middle of the area, began a volume at 00:56 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 179Jun 14, 8:25 PM CDT

The nearest sounding before it

Bismarck Municip, ND (KBIS), launched 00:00Z, 0.9 hours before the alert went out and 249 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: 2531 J/kg
Mixed-layer CIN: -283 J/kg
Mixed-layer LCL: 1747 m above ground
0-6 km bulk shear: 47 kt
0-1 km storm-relative helicity: 73 m²/s²
0-3 km storm-relative helicity: 137 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.3

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 14, 8:32 PM CDT	Tornado Watch	SPC	Benson, Cavalier, Pembina, Ramsey, Towner, Walsh	5 hr
Jun 14, 11:14 PM CDT	Mesoscale Discussion	SPC	Benson, Cavalier, Pembina, Ramsey, Towner, Walsh	91 min
Jun 15, 1:33 AM CDT	Mesoscale Discussion	SPC	Barnes, Cass, Grand Forks, Griggs, Nelson, Pembina and 3 more	87 min

Nearby

Mesoscale Discussions in North 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.