Alert archive / Montana / Mesoscale Discussions in 2007

Mesoscale Discussion 1359

July 2, 200711 counties in Montana; 6 counties in North Dakota

The Storm Prediction Center issued this mesoscale discussion at Jul 2, 2007, 6:45 PM MDT for 11 counties in Montana; 6 counties in North Dakota. It was in force for 90 min.

The area

The outline as issued.

The facts

Issued: Jul 2, 2007, 6:45 PM MDT (00:45 UTC)
Expired: Jul 2, 2007, 8:15 PM MDT
In force: 90 min
Issued by: the Storm Prediction Center

Counties Daniels County, MT, Dawson County, MT, Garfield County, MT, McCone County, MT, Petroleum County, MT, Phillips County, MT, Richland County, MT, Roosevelt County, MT, Sheridan County, MT, Valley County, MT, Wibaux County, MT, Burke County, ND, Divide County, ND, Mountrail County, ND, Renville County, ND, Ward County, ND, Williams County, ND

The radar

The Glasgow radar (KGGW), 99 km from the middle of the area, began a volume at 00:47 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.

Severe Thunderstorm Watch 475Jul 2, 10:10 PM MDT

The nearest sounding before it

Glasgow Intl Airport, MT (KGGW), launched 00:00Z, 0.8 hours before the alert went out and 98 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: 608 J/kg
Mixed-layer CIN: -141 J/kg
Mixed-layer LCL: 2366 m above ground
0-6 km bulk shear: 45 kt
0-1 km storm-relative helicity: 77 m²/s²
0-3 km storm-relative helicity: 357 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.9

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 2, 6:25 PM MDT	Mesoscale Discussion	SPC	Big Horn, Blaine, Carbon, Carter, Chouteau, Custer and 14 more	2 hr
Jul 3, 12:58 AM MDT	Mesoscale Discussion	SPC	Dawson, Fallon, Prairie, Wibaux	2 hr
Jul 2, 9:55 PM MDT	Mesoscale Discussion	SPC	Benson, Billings, Bottineau, Burke, Burleigh, Divide and 22 more	65 min
Jul 2, 10:13 PM MDT	Severe Thunderstorm Watch	SPC	Billings, Bottineau, Burke, Divide, Dunn, Golden Valley and 13 more	5 hr
Jul 3, 1:21 AM MDT	Severe Thunderstorm Watch	SPC	Adams, Barnes, Benson, Bowman, Burleigh, Cass and 24 more	7 hr
Jul 3, 4:41 AM MDT	Mesoscale Discussion	SPC	Adams, Barnes, Bowman, Cass, Dickey, Emmons and 15 more	2 hr
Jul 3, 5:39 AM MDT	Mesoscale Discussion	SPC	Richland	2 hr

Nearby

Mesoscale Discussions in Montana, 2007 Mesoscale Discussions in North 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.