Alert archive / North Dakota / Mesoscale Discussions in 2011

Mesoscale Discussion 1071

June 2, 20116 counties in Montana; 16 counties in North Dakota

The Storm Prediction Center issued this mesoscale discussion at Jun 2, 2011, 4:37 PM MDT for 6 counties in Montana; 16 counties in North Dakota. It was in force for 83 min.

The area

The outline as issued.

The facts

Issued: Jun 2, 2011, 4:37 PM MDT (22:37 UTC)
Expired: Jun 2, 2011, 6:00 PM MDT
In force: 83 min
Issued by: the Storm Prediction Center

All 22 counties

Daniels County, MT, Dawson County, MT, Richland County, MT, Roosevelt County, MT, Sheridan County, MT, Wibaux County, MT, Billings County, ND, Burke County, ND, Divide County, ND, Dunn County, ND, Golden Valley County, ND, McHenry County, ND, McKenzie County, ND, McLean County, ND, Mercer County, ND, Mountrail County, ND, Oliver County, ND, Renville County, ND, Sheridan County, ND, Stark County, ND, Ward 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 2, 6:20 PM MDT

The nearest sounding before it

Glasgow Intl Airport, MT (KGGW), launched 12:00Z, 10.6 hours before the alert went out and 256 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: 736 m above ground
0-6 km bulk shear: 58 kt
0-1 km storm-relative helicity: 22 m²/s²
0-3 km storm-relative helicity: 201 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.1

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 2, 1:54 PM MDT	Mesoscale Discussion	SPC	Custer, Daniels, Dawson, Fallon, Garfield, McCone and 6 more	66 min
Jun 2, 2:09 PM MDT	Severe Thunderstorm Watch	SPC	Custer, Daniels, Dawson, Fallon, Garfield, McCone and 8 more	7 hr

Nearby

Mesoscale Discussions in North Dakota, 2011 Mesoscale Discussions in Montana, 2011 Every mesoscale discussion in 2011

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.