Alert archive / North Dakota / Mesoscale Discussions in 2010

Mesoscale Discussion 1649

August 11, 20104 counties in Montana; 13 counties in North Dakota

The Storm Prediction Center issued this mesoscale discussion at Aug 11, 2010, 10:42 PM MDT for 4 counties in Montana; 13 counties in North Dakota. It was in force for 63 min.

The area

The outline as issued.

The facts

Issued: Aug 11, 2010, 10:42 PM MDT (04:42 UTC)
Expired: Aug 11, 2010, 11:45 PM MDT
In force: 63 min
Issued by: the Storm Prediction Center

Counties Daniels County, MT, Richland County, MT, Roosevelt County, MT, Sheridan County, MT, Billings County, ND, Bottineau County, ND, Burke County, ND, Divide County, ND, Dunn County, ND, Golden Valley County, ND, McKenzie County, ND, McLean County, ND, Mercer County, ND, Mountrail County, ND, Renville County, ND, Ward County, ND, Williams County, ND

The radar

The Glasgow radar (KGGW), 209 km from the middle of the area, began a volume at 04:42 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, 4.7 hours before the alert went out and 208 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: 1592 J/kg
Mixed-layer CIN: -33 J/kg
Mixed-layer LCL: 2371 m above ground
0-6 km bulk shear: 25 kt
0-1 km storm-relative helicity: -29 m²/s²
0-3 km storm-relative helicity: 119 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.3

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
Aug 11, 7:32 PM MDT	Mesoscale Discussion	SPC	Blaine, Daniels, Dawson, Fergus, Garfield, McCone and 6 more	58 min
Aug 12, 2:47 PM MDT	Mesoscale Discussion	SPC	Big Horn, Carter, Custer, Powder River, Rosebud, Treasure and 1 more	88 min
Aug 11, 11:42 PM MDT	Severe Thunderstorm Watch	SPC	Barnes, Benson, Bottineau, Cass, Cavalier, Eddy and 17 more	5 hr
Aug 12, 1:40 AM MDT	Mesoscale Discussion	SPC	Barnes, Benson, Burleigh, Cass, Cavalier, Dickey and 19 more	2 hr
Aug 12, 1:05 PM MDT	Mesoscale Discussion	SPC	Dickey, LaMoure, Ransom, Richland, Sargent	115 min
Aug 12, 2:22 PM MDT	Tornado Watch	SPC	Richland, Sargent	7 hr

Nearby

Mesoscale Discussions in North Dakota, 2010 Mesoscale Discussions in Montana, 2010 Every mesoscale discussion in 2010

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.