Alert archive / Montana / Mesoscale Discussions in 2003

Mesoscale Discussion 2128

August 8, 20034 counties in Montana

The Storm Prediction Center issued this mesoscale discussion at Aug 8, 2003, 7:06 PM MDT for 4 counties in Montana. It was in force for 114 min.

The area

The outline as issued.

The facts

Issued: Aug 8, 2003, 7:06 PM MDT (01:06 UTC)
Expired: Aug 8, 2003, 9:00 PM MDT
In force: 114 min
Issued by: the Storm Prediction Center

Counties Fergus County, MT, Garfield County, MT, McCone County, MT, Petroleum County, MT

The radar

The Glasgow radar (KGGW), 145 km from the middle of the area, began a volume at 01:10 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

Glasgow Intl Airport, MT (KGGW), launched 00:00Z, 1.1 hours before the alert went out and 148 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: 2301 J/kg
Mixed-layer CIN: -16 J/kg
Mixed-layer LCL: 2167 m above ground
0-6 km bulk shear: 46 kt
0-1 km storm-relative helicity: 45 m²/s²
0-3 km storm-relative helicity: 296 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 20.1

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
Aug 8, 6:03 PM MDT	Mesoscale Discussion	SPC	Dawson, Richland, Roosevelt, Sheridan, Wibaux	87 min
Aug 8, 9:20 PM MDT	Mesoscale Discussion	SPC	Cascade, Chouteau, Custer, Dawson, Fallon, Fergus and 18 more	55 min
Aug 9, 12:19 PM MDT	Mesoscale Discussion	SPC	Richland, Roosevelt, Sheridan	116 min

Nearby

Mesoscale Discussions in Montana, 2003 Every mesoscale discussion in 2003

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.