Alert archive / Montana / Mesoscale Discussions in 2007

Mesoscale Discussion 1174

June 17, 20078 counties in Montana; 4 counties in North Dakota

The Storm Prediction Center issued this mesoscale discussion at Jun 17, 2007, 4:02 AM MDT for 8 counties in Montana; 4 counties in North Dakota. It was in force for 58 min.

The area

The outline as issued.

The facts

Issued: Jun 17, 2007, 4:02 AM MDT (10:02 UTC)
Expired: Jun 17, 2007, 5:00 AM MDT
In force: 58 min
Issued by: the Storm Prediction Center

Counties Custer County, MT, Dawson County, MT, Fallon County, MT, Powder River County, MT, Prairie County, MT, Richland County, MT, Rosebud County, MT, Wibaux County, MT, Billings County, ND, Golden Valley County, ND, McKenzie County, ND, Williams County, ND

The radar

The Glasgow radar (KGGW), 183 km from the middle of the area, began a volume at 10:05 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 406Jun 17, 4:30 AM MDT

The nearest sounding before it

Glasgow Intl Airport, MT (KGGW), launched 00:00Z, 10.0 hours before the alert went out and 183 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: 205 J/kg
Mixed-layer CIN: -21 J/kg
Mixed-layer LCL: 1742 m above ground
0-6 km bulk shear: 77 kt
0-1 km storm-relative helicity: 130 m²/s²
0-3 km storm-relative helicity: 388 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 2.7

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 16, 6:02 PM MDT	Mesoscale Discussion	SPC	Big Horn, Broadwater, Carbon, Cascade, Chouteau, Fergus and 16 more	88 min
Jun 16, 6:59 PM MDT	Mesoscale Discussion	SPC	Big Horn, Carter, Custer, Dawson, Fallon, Garfield and 9 more	91 min
Jun 16, 8:06 PM MDT	Mesoscale Discussion	SPC	Richland, Wibaux	54 min
Jun 16, 10:23 PM MDT	Mesoscale Discussion	SPC	Big Horn, Carter, Custer, Dawson, Fallon, Garfield and 7 more	97 min
Jun 17, 12:32 AM MDT	Mesoscale Discussion	SPC	Fergus, Garfield, McCone, Petroleum	28 min
Jun 17, 12:53 AM MDT	Severe Thunderstorm Watch	SPC	Custer, Dawson, Fergus, Garfield, Golden Valley, Judith Basin and 9 more	4 hr
Jun 17, 4:40 AM MDT	Severe Thunderstorm Watch	SPC	Big Horn, Custer, Dawson, Fallon, Prairie, Richland and 3 more	3 hr
Jun 16, 10:06 PM MDT	Severe Thunderstorm Watch	SPC	Adams, Barnes, Benson, Billings, Bowman, Burleigh and 33 more	7 hr
Jun 17, 1:49 AM MDT	Mesoscale Discussion	SPC	Barnes, Benson, Bottineau, Cass, Cavalier, Eddy and 19 more	86 min
Jun 17, 2:09 AM MDT	Tornado Watch	SPC	Barnes, Cass, Ransom, Richland	6 hr
Jun 17, 3:08 PM MDT	Mesoscale Discussion	SPC	Eddy, Foster, Grand Forks, Griggs, Nelson, Pembina and 4 more	67 min
Jun 17, 3:18 PM MDT	Tornado Watch	SPC	Grand Forks, Griggs, Nelson, Pembina, Steele, Traill and 1 more	8 hr
Jun 17, 3:44 PM MDT	Mesoscale Discussion	SPC	Burleigh, Dickey, Emmons, Foster, Kidder, LaMoure and 8 more	91 min
Jun 17, 4:13 PM MDT	Tornado Watch	SPC	Barnes, Burleigh, Cass, Dickey, Eddy, Emmons and 12 more	7 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.