Alert archive / Montana / Mesoscale Discussions in 2016

Mesoscale Discussion 878

June 11, 201615 counties in Montana

The Storm Prediction Center issued this mesoscale discussion at Jun 11, 2016, 5:28 PM MDT for 15 counties in Montana. It was in force for 92 min.

The area

The outline as issued.

The facts

Issued: Jun 11, 2016, 5:28 PM MDT (23:28 UTC)
Expired: Jun 11, 2016, 7:00 PM MDT
In force: 92 min
Issued by: the Storm Prediction Center

Counties Big Horn County, MT, 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, Treasure County, MT, Valley County, MT, Wibaux County, MT

The radar

The Billings radar (KBLX), 173 km from the middle of the area, began a volume at 23:31 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 12:00Z, 11.5 hours before the alert went out and 195 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 2008 m above ground
0-6 km bulk shear: 68 kt
0-1 km storm-relative helicity: -15 m²/s²
0-3 km storm-relative helicity: 300 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.0

Open this sounding in Storm Lab

The text

As transmitted.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 10, 8:35 PM MDT	Mesoscale Discussion	SPC	Blaine, Cascade, Chouteau, Fergus, Garfield, Hill and 9 more	85 min
Jun 11, 5:25 AM MDT	Mesoscale Discussion	SPC	Blaine, Chouteau, Hill	95 min
Jun 11, 2:50 PM MDT	Mesoscale Discussion	SPC	Big Horn, Carter, Custer, Daniels, Dawson, Fallon and 17 more	85 min
Jun 11, 3:00 PM MDT	Severe Thunderstorm Watch	SPC	Big Horn, Carter, Custer, Daniels, Dawson, Fallon and 15 more	7 hr

Nearby

Mesoscale Discussions in Montana, 2016 Every mesoscale discussion in 2016

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.