Alert archive / Montana / Mesoscale Discussions in 2015

Mesoscale Discussion 905

June 5, 201528 counties in Montana

The Storm Prediction Center issued this mesoscale discussion at Jun 5, 2015, 6:41 PM MDT for 28 counties in Montana. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Jun 5, 2015, 6:41 PM MDT (00:41 UTC)
Expired: Jun 5, 2015, 8:45 PM MDT
In force: 2 hr
Issued by: the Storm Prediction Center

All 28 counties

Big Horn County, MT, Blaine County, MT, Carbon County, MT, Carter County, MT, Custer County, MT, Daniels County, MT, Dawson County, MT, Fallon County, MT, Fergus County, MT, Garfield County, MT, Golden Valley County, MT, Hill County, MT, McCone County, MT, Musselshell County, MT, Petroleum County, MT, Phillips County, MT, Powder River County, MT, Prairie County, MT, Richland County, MT, Roosevelt County, MT, Rosebud County, MT, Sheridan County, MT, Stillwater County, MT, Treasure County, MT, Valley County, MT, Wheatland County, MT, Wibaux County, MT, Yellowstone County, MT

The radar

The Billings radar (KBLX), 118 km from the middle of the area, began a volume at 00:44 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, 0.7 hours before the alert went out and 193 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: 972 J/kg
Mixed-layer CIN: -20 J/kg
Mixed-layer LCL: 1263 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 77 m²/s²
0-3 km storm-relative helicity: 174 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 3.6

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
Jun 5, 8:42 PM MDT	Mesoscale Discussion	SPC	Big Horn, Custer, Dawson, Garfield, McCone, Musselshell and 9 more	93 min

Nearby

Mesoscale Discussions in Montana, 2015 Every mesoscale discussion in 2015

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.