Alert archive / Montana / Mesoscale Discussions in 2004

Mesoscale Discussion 1612

July 10, 20047 counties in Montana; 5 counties in North Dakota

The Storm Prediction Center issued this mesoscale discussion at Jul 10, 2004, 11:40 PM MDT for 7 counties in Montana; 5 counties in North Dakota. It was in force for 35 min.

The area

The outline as issued.

The facts

Issued: Jul 10, 2004, 11:40 PM MDT (05:40 UTC)
Expired: Jul 11, 2004, 12:15 AM MDT
In force: 35 min
Issued by: the Storm Prediction Center

Counties Custer County, MT, Dawson County, MT, Fallon County, MT, Garfield County, MT, Prairie County, MT, Rosebud County, MT, Wibaux County, MT, Billings County, ND, Bowman County, ND, Golden Valley County, ND, Slope County, ND, Stark County, ND

The radar

The Glasgow radar (KGGW), 209 km from the middle of the area, began a volume at 05:42 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

Bismarck Municip, ND (KBIS), launched 00:00Z, 5.7 hours before the alert went out and 348 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: 3426 J/kg
Mixed-layer CIN: -13 J/kg
Mixed-layer LCL: 843 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 84 m²/s²
0-3 km storm-relative helicity: 150 m²/s²
Significant tornado parameter: 1.8
Supercell composite: 9.7

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
Jul 10, 6:56 PM MDT	Mesoscale Discussion	SPC	Blaine, Carter, Cascade, Chouteau, Custer, Dawson and 21 more	94 min
Jul 10, 9:40 PM MDT	Mesoscale Discussion	SPC	Dawson, Prairie, Wibaux	2 hr
Jul 11, 11:48 AM MDT	Mesoscale Discussion	SPC	Blaine, Carter, Custer, Daniels, Dawson, Fallon and 8 more	117 min
Jul 11, 1:52 PM MDT	Mesoscale Discussion	SPC	Big Horn, Blaine, Carbon, Carter, Chouteau, Custer and 19 more	83 min
Jul 11, 2:40 PM MDT	Severe Thunderstorm Watch	SPC	Big Horn, Carter, Custer, Daniels, Dawson, Fallon and 12 more	6 hr
Jul 11, 5:34 PM MDT	Mesoscale Discussion	SPC	Big Horn, Carter, Custer, Daniels, Dawson, Fallon and 14 more	86 min
Jul 10, 7:51 PM MDT	Mesoscale Discussion	SPC	Barnes, Cass, Dickey, LaMoure, Ransom, Richland and 2 more	54 min
Jul 10, 8:10 PM MDT	Severe Thunderstorm Watch	SPC	Cass, Ransom, Richland, Sargent, Steele, Traill	6 hr
Jul 10, 10:19 PM MDT	Mesoscale Discussion	SPC	Richland	116 min

Nearby

Mesoscale Discussions in Montana, 2004 Mesoscale Discussions in North Dakota, 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.