Alert archive / North Dakota / Mesoscale Discussions in 2012

Mesoscale Discussion 1361

July 2, 20125 counties in Montana; 7 counties in North Dakota

The Storm Prediction Center issued this mesoscale discussion at Jul 2, 2012, 12:23 AM MDT for 5 counties in Montana; 7 counties in North Dakota. It was in force for 97 min.

The area

The outline as issued.

The facts

Issued: Jul 2, 2012, 12:23 AM MDT (06:23 UTC)
Expired: Jul 2, 2012, 2:00 AM MDT
In force: 97 min
Issued by: the Storm Prediction Center
Chance of a watch: 40%

Counties Daniels County, MT, McCone County, MT, Richland County, MT, Roosevelt County, MT, Sheridan County, MT, Burke County, ND, Divide County, ND, McKenzie County, ND, Mountrail County, ND, Renville County, ND, Ward County, ND, Williams County, ND

The radar

The Glasgow radar (KGGW), 208 km from the middle of the area, began a volume at 06:27 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 nearest sounding before it

Glasgow Intl Airport, MT (KGGW), launched 00:00Z, 6.4 hours before the alert went out and 206 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: 1259 J/kg
Mixed-layer CIN: -132 J/kg
Mixed-layer LCL: 2823 m above ground
0-6 km bulk shear: 47 kt
0-1 km storm-relative helicity: 144 m²/s²
0-3 km storm-relative helicity: 207 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 8.9

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
Jul 1, 6:35 PM MDT	Mesoscale Discussion	SPC	Carter, Custer, Daniels, Dawson, Fallon, McCone and 7 more	115 min
Jul 1, 7:10 PM MDT	Mesoscale Discussion	SPC	Beaverhead, Blaine, Broadwater, Carbon, Chouteau, Fergus and 14 more	2 hr
Jul 2, 9:59 AM MDT	Mesoscale Discussion	SPC	Benson, Cavalier, Eddy, Grand Forks, Griggs, Nelson and 8 more	91 min
Jul 2, 10:43 AM MDT	Severe Thunderstorm Watch	SPC	Barnes, Cass, Cavalier, Grand Forks, Griggs, Nelson and 5 more	7 hr
Jul 2, 2:33 PM MDT	Mesoscale Discussion	SPC	Traill	87 min
Jul 2, 5:40 PM MDT	Mesoscale Discussion	SPC	Barnes, Cass, Cavalier, Grand Forks, Griggs, Nelson and 4 more	65 min
Jul 2, 5:54 PM MDT	Severe Thunderstorm Watch	SPC	Cass, Grand Forks, Pembina, Traill, Walsh	6 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; radar from the NEXRAD Level II archive.