Alert archive / North Dakota / Mesoscale Discussions in 2012

Mesoscale Discussion 1257

June 24, 2012Richland County, Roosevelt County, Sheridan County, Montana; 16 counties in North Dakota

The Storm Prediction Center issued this mesoscale discussion at Jun 24, 2012, 8:16 AM MDT for Richland County, Roosevelt County, Sheridan County, Montana; 16 counties in North Dakota. It was in force for 89 min.

The area

The outline as issued.

The facts

Issued: Jun 24, 2012, 8:16 AM MDT (14:16 UTC)
Expired: Jun 24, 2012, 9:45 AM MDT
In force: 89 min
Issued by: the Storm Prediction Center
Chance of a watch: 80%

Counties Richland County, MT, Roosevelt County, MT, Sheridan County, MT, Benson County, ND, Burleigh County, ND, Divide County, ND, Dunn County, ND, McHenry County, ND, McKenzie County, ND, McLean County, ND, Mercer County, ND, Morton County, ND, Mountrail County, ND, Oliver County, ND, Pierce County, ND, Sheridan County, ND, Ward County, ND, Wells County, ND, Williams County, ND

The watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

Severe Thunderstorm Watch 421Jun 24, 8:35 AM MDT

The nearest sounding before it

Bismarck Municip, ND (KBIS), launched 12:00Z, 2.3 hours before the alert went out and 222 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 951 m above ground
0-6 km bulk shear: 55 kt
0-1 km storm-relative helicity: 134 m²/s²
0-3 km storm-relative helicity: 234 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 3.4

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 23, 7:36 PM MDT	Mesoscale Discussion	SPC	Flathead, Lake, Pondera, Teton	84 min
Jun 24, 3:47 AM MDT	Mesoscale Discussion	SPC	Daniels, Roosevelt, Sheridan, Valley	88 min
Jun 24, 8:31 AM MDT	Severe Thunderstorm Watch	SPC	Daniels, Richland, Roosevelt, Sheridan	5 hr
Jun 24, 11:24 AM MDT	Mesoscale Discussion	SPC	Daniels, Richland, Roosevelt, Sheridan	2 hr

Nearby

Mesoscale Discussions in North Dakota, 2012 Mesoscale Discussions in Montana, 2012 Every mesoscale discussion in 2012

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.