Alert archive / Montana / Mesoscale Discussions in 2012

Mesoscale Discussion 1023

June 2, 201218 counties in Montana

The Storm Prediction Center issued this mesoscale discussion at Jun 2, 2012, 6:08 PM MDT for 18 counties in Montana. It was in force for 97 min.

The area

The outline as issued.

The facts

Issued: Jun 2, 2012, 6:08 PM MDT (00:08 UTC)
Expired: Jun 2, 2012, 7:45 PM MDT
In force: 97 min
Issued by: the Storm Prediction Center

Counties Big Horn County, MT, Carbon County, MT, Carter County, MT, Custer County, MT, Dawson County, MT, Fallon County, MT, Fergus County, MT, Garfield County, MT, Golden Valley County, MT, McCone County, MT, Musselshell County, MT, Petroleum County, MT, Powder River County, MT, Prairie County, MT, Rosebud County, MT, Treasure County, MT, Wibaux County, MT, Yellowstone County, MT

The radar

The Glasgow radar (KGGW), 161 km from the middle of the area, began a volume at 00:08 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, 0.1 hours before the alert went out and 162 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: 27 J/kg
Mixed-layer CIN: -209 J/kg
Mixed-layer LCL: 1678 m above ground
0-6 km bulk shear: 45 kt
0-1 km storm-relative helicity: 154 m²/s²
0-3 km storm-relative helicity: 336 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

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 3, 1:42 PM MDT	Mesoscale Discussion	SPC	Big Horn, Carbon, Gallatin, Golden Valley, Madison, Musselshell and 6 more	2 hr

Nearby

Mesoscale Discussions in Montana, 2012 Every mesoscale discussion in 2012

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.