Alert archive / Montana / Mesoscale Discussions in 2012

Mesoscale Discussion 1274

June 25, 20124 states

The Storm Prediction Center issued this mesoscale discussion at Jun 25, 2012, 2:09 PM MDT for 4 states. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Jun 25, 2012, 2:09 PM MDT (20:09 UTC)
Expired: Jun 25, 2012, 4:15 PM MDT
In force: 2 hr
Issued by: the Storm Prediction Center
Chance of a watch: 40%

All 21 counties

Carter County, MT, Custer County, MT, Dawson County, MT, Fallon County, MT, Powder River County, MT, Prairie County, MT, Rosebud County, MT, Wibaux County, MT, Adams County, ND, Billings County, ND, Bowman County, ND, Golden Valley County, ND, Slope County, ND, Stark County, ND, Butte County, SD, Harding County, SD, Lawrence County, SD, Campbell County, WY, Crook County, WY, Sheridan County, WY, Weston County, WY

The watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

The nearest sounding before it

Rapid City, SD (KUNR), launched 12:00Z, 8.2 hours before the alert went out and 253 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: 2066 J/kg
Mixed-layer CIN: -369 J/kg
Mixed-layer LCL: 611 m above ground
0-6 km bulk shear: 11 kt
0-1 km storm-relative helicity: 54 m²/s²
0-3 km storm-relative helicity: 56 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 25, 3:07 PM MDT	Severe Thunderstorm Watch	SPC	Big Horn, Carter, Custer, Fallon, Powder River, Rosebud and 1 more	7 hr
Jun 25, 3:35 PM MDT	Mesoscale Discussion	SPC	Blaine, Chouteau, Garfield, Glacier, Hill, Liberty and 4 more	85 min
Jun 25, 4:01 PM MDT	Severe Thunderstorm Watch	SPC	Blaine, Cascade, Chouteau, Daniels, Dawson, Fergus and 18 more	9 hr
Jun 25, 5:26 PM MDT	Mesoscale Discussion	SPC	Carter, Custer, Fallon, Powder River	94 min

Nearby

Mesoscale Discussions in Montana, 2012 Mesoscale Discussions in North Dakota, 2012 Mesoscale Discussions in Wyoming, 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.