Alert archive / Montana / Mesoscale Discussions in 2012

Mesoscale Discussion 1291

June 26, 20129 counties in Montana

The Storm Prediction Center issued this mesoscale discussion at Jun 26, 2012, 2:21 PM MDT for 9 counties in Montana. It was in force for 54 min.

The area

The outline as issued.

The facts

Issued: Jun 26, 2012, 2:21 PM MDT (20:21 UTC)
Expired: Jun 26, 2012, 3:15 PM MDT
In force: 54 min
Issued by: the Storm Prediction Center

Counties Blaine County, MT, Cascade County, MT, Chouteau County, MT, Hill County, MT, Lewis and Clark County, MT, Liberty County, MT, Pondera County, MT, Teton County, MT, Toole County, MT

The radar

The Great Falls radar (KTFX), 82 km from the middle of the area, began a volume at 20:23 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

Great_falls, MT (KTFX), launched 12:00Z, 8.4 hours before the alert went out and 101 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: 1099 J/kg
Mixed-layer CIN: -173 J/kg
Mixed-layer LCL: 763 m above ground
0-6 km bulk shear: 53 kt
0-1 km storm-relative helicity: 223 m²/s²
0-3 km storm-relative helicity: 481 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 20.6

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 25, 7:12 PM MDT	Mesoscale Discussion	SPC	Blaine, Chouteau, Dawson, Fergus, Garfield, Hill and 11 more	93 min
Jun 25, 10:27 PM MDT	Mesoscale Discussion	SPC	Blaine, Chouteau, Fergus, Garfield, Hill, Liberty and 3 more	93 min
Jun 26, 12:23 AM MDT	Mesoscale Discussion	SPC	Blaine, Chouteau, Hill	67 min
Jun 26, 6:16 AM MDT	Mesoscale Discussion	SPC	Glacier, Hill, Liberty, Pondera, Teton, Toole	89 min
Jun 26, 11:08 AM MDT	Mesoscale Discussion	SPC	Blaine, Cascade, Chouteau, Glacier, Hill, Liberty and 3 more	37 min
Jun 26, 11:20 AM MDT	Severe Thunderstorm Watch	SPC	Blaine, Cascade, Chouteau, Glacier, Hill, Lewis and Clark and 4 more	6 hr
Jun 26, 2:06 PM MDT	Mesoscale Discussion	SPC	Daniels, Dawson, Fallon, McCone, Phillips, Prairie and 5 more	54 min

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.