Alert archive / North Dakota / Mesoscale Discussions in 2004

Mesoscale Discussion 1623

July 11, 200415 counties in Montana; 18 counties in North Dakota

The Storm Prediction Center issued this mesoscale discussion at Jul 11, 2004, 8:19 PM MDT for 15 counties in Montana; 18 counties in North Dakota. It was in force for 116 min.

The area

The outline as issued.

The facts

Issued: Jul 11, 2004, 8:19 PM MDT (02:19 UTC)
Expired: Jul 11, 2004, 10:15 PM MDT
In force: 116 min
Issued by: the Storm Prediction Center

All 33 counties

Custer County, MT, Daniels County, MT, Dawson County, MT, Fallon County, MT, Garfield County, MT, McCone County, MT, Musselshell County, MT, Petroleum County, MT, Prairie County, MT, Richland County, MT, Roosevelt County, MT, Rosebud County, MT, Sheridan County, MT, Treasure County, MT, Wibaux County, MT, Adams County, ND, Billings County, ND, Burke County, ND, Divide County, ND, Dunn County, ND, Golden Valley County, ND, Grant County, ND, Hettinger County, ND, McKenzie County, ND, McLean County, ND, Mercer County, ND, Morton County, ND, Mountrail County, ND, Oliver County, ND, Renville County, ND, Slope County, ND, Stark County, ND, Williams County, ND

The radar

The Glasgow radar (KGGW), 181 km from the middle of the area, began a volume at 02:18 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 608Jul 11, 8:40 PM MDT

The nearest sounding before it

Glasgow Intl Airport, MT (KGGW), launched 00:00Z, 2.3 hours before the alert went out and 180 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: 1145 J/kg
Mixed-layer CIN: -83 J/kg
Mixed-layer LCL: 2211 m above ground
0-6 km bulk shear: 43 kt
0-1 km storm-relative helicity: 14 m²/s²
0-3 km storm-relative helicity: 86 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.6

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 11, 8:40 PM MDT	Severe Thunderstorm Watch	SPC	Daniels, Dawson, McCone, Prairie, Richland, Roosevelt and 2 more	5 hr
Jul 11, 10:34 PM MDT	Mesoscale Discussion	SPC	Richland	116 min
Jul 11, 6:20 PM MDT	Severe Thunderstorm Watch	SPC	Adams, Billings, Bottineau, Bowman, Burke, Divide and 16 more	8 hr
Jul 11, 10:50 PM MDT	Severe Thunderstorm Watch	SPC	Barnes, Benson, Burleigh, Cavalier, Dickey, Eddy and 17 more	6 hr
Jul 12, 12:29 AM MDT	Mesoscale Discussion	SPC	Barnes, Benson, Bottineau, Burleigh, Cass, Cavalier and 28 more	91 min
Jul 12, 12:55 AM MDT	Severe Thunderstorm Watch	SPC	Cass, Grand Forks, Ransom, Richland, Sargent, Steele and 1 more	5 hr
Jul 12, 2:13 AM MDT	Mesoscale Discussion	SPC	Barnes, Cass, Dickey, Emmons, Foster, Grand Forks and 14 more	92 min
Jul 12, 3:53 AM MDT	Mesoscale Discussion	SPC	Cass, Richland, Traill	67 min
Jul 12, 7:53 AM MDT	Mesoscale Discussion	SPC	Dickey, McIntosh, Sargent	2 hr

Nearby

Mesoscale Discussions in North Dakota, 2004 Mesoscale Discussions in Montana, 2004 Every mesoscale discussion in 2004

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.