Alert archive / North Dakota / Mesoscale Discussions in 2007

Mesoscale Discussion 1267

June 24, 20074 states

The Storm Prediction Center issued this mesoscale discussion at Jun 24, 2007, 2:46 PM MDT for 4 states. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Jun 24, 2007, 2:46 PM MDT (20:46 UTC)
Expired: Jun 24, 2007, 5:15 PM MDT
In force: 2 hr
Issued by: the Storm Prediction Center

All 25 counties

Big Horn County, MT, Carter County, MT, Custer County, MT, Fallon County, MT, Powder River County, MT, Prairie County, MT, Rosebud County, MT, Treasure County, MT, Wibaux County, MT, Adams County, ND, Billings County, ND, Bowman County, ND, Dunn County, ND, Golden Valley County, ND, Grant County, ND, Hettinger County, ND, Mercer County, ND, Slope County, ND, Stark County, ND, Butte County, SD, Harding County, SD, Lawrence County, SD, Perkins County, SD, Crook County, WY, Sheridan County, WY

The radar

The Rapid City radar (KUDX), 214 km from the middle of the area, began a volume at 20:49 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.

The nearest sounding before it

Glasgow Intl Airport, MT (KGGW), launched 12:00Z, 8.8 hours before the alert went out and 327 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: 2158 m above ground
0-6 km bulk shear: 85 kt
0-1 km storm-relative helicity: 32 m²/s²
0-3 km storm-relative helicity: 204 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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 24, 4:06 PM MDT	Tornado Watch	SPC	Big Horn, Carbon, Carter, Custer, Dawson, Fallon and 14 more	7 hr
Jun 23, 7:46 PM MDT	Mesoscale Discussion	SPC	Cavalier, Grand Forks, Nelson, Pembina, Ramsey, Rolette and 2 more	89 min
Jun 23, 8:24 PM MDT	Tornado Watch	SPC	Benson, Cavalier, Eddy, Grand Forks, Griggs, Nelson and 8 more	5 hr
Jun 24, 3:03 PM MDT	Mesoscale Discussion	SPC	Benson, Burleigh, Cavalier, Eddy, Emmons, Foster and 20 more	117 min

Nearby

Mesoscale Discussions in North Dakota, 2007 Mesoscale Discussions in Montana, 2007 Mesoscale Discussions in South Dakota, 2007 Every mesoscale discussion in 2007

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.