Alert archive / Montana / Mesoscale Discussions in 2003

Mesoscale Discussion 1320

June 11, 200313 counties in Montana

The Storm Prediction Center issued this mesoscale discussion at Jun 11, 2003, 11:30 AM MDT for 13 counties in Montana. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Jun 11, 2003, 11:30 AM MDT (17:30 UTC)
Expired: Jun 11, 2003, 1:30 PM MDT
In force: 2 hr
Issued by: the Storm Prediction Center

Counties Carter County, MT, Custer County, MT, Dawson County, MT, Fallon County, MT, Garfield County, MT, McCone County, MT, Powder River County, MT, Prairie County, MT, Richland County, MT, Roosevelt County, MT, Rosebud County, MT, Valley County, MT, Wibaux County, MT

The nearest sounding before it

Rapid City, SD (KUNR), launched 12:00Z, 5.5 hours before the alert went out and 369 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: 14 J/kg
Mixed-layer CIN: -460 J/kg
Mixed-layer LCL: 1051 m above ground
0-6 km bulk shear: 40 kt
0-1 km storm-relative helicity: 99 m²/s²
0-3 km storm-relative helicity: 74 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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 10, 6:00 PM MDT	Mesoscale Discussion	SPC	Deer Lodge, Flathead, Glacier, Granite, Jefferson, Lake and 9 more	2 hr
Jun 10, 8:27 PM MDT	Mesoscale Discussion	SPC	Blaine, Chouteau, Fergus, Golden Valley, Hill, Judith Basin and 9 more	2 hr

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.