Alert archive / Montana / Mesoscale Discussions in 2004

Mesoscale Discussion 1610

July 10, 2004Dawson County, Prairie County, Wibaux County, Montana

The Storm Prediction Center issued this mesoscale discussion at Jul 10, 2004, 9:40 PM MDT for Dawson County, Prairie County, Wibaux County, Montana. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Jul 10, 2004, 9:40 PM MDT (03:40 UTC)
Expired: Jul 10, 2004, 11:45 PM MDT
In force: 2 hr
Issued by: the Storm Prediction Center

Counties Dawson County, MT, Prairie County, MT, Wibaux County, MT

The radar

The Glasgow radar (KGGW), 141 km from the middle of the area, began a volume at 03:43 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

Great_falls, MT (KTFX), launched 00:00Z, 3.7 hours before the alert went out and 361 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: 50 J/kg
Mixed-layer CIN: -180 J/kg
Mixed-layer LCL: 2812 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: 120 m²/s²
0-3 km storm-relative helicity: 127 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 4.6

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 10, 6:56 PM MDT	Mesoscale Discussion	SPC	Blaine, Carter, Cascade, Chouteau, Custer, Dawson and 21 more	94 min
Jul 10, 11:40 PM MDT	Mesoscale Discussion	SPC	Custer, Dawson, Fallon, Garfield, Prairie, Rosebud and 1 more	35 min
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

Nearby

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.