Alert archive / Montana / Mesoscale Discussions in 2012

Mesoscale Discussion 1278

June 25, 20124 counties in Montana; Custer County, Lawrence County, South Dakota; Crook County, Weston County, Wyoming

The Storm Prediction Center issued this mesoscale discussion at Jun 25, 2012, 5:26 PM MDT for 4 counties in Montana; Custer County, Lawrence County, South Dakota; Crook County, Weston County, Wyoming. It was in force for 94 min.

The area

The outline as issued.

The facts

Issued: Jun 25, 2012, 5:26 PM MDT (23:26 UTC)
Expired: Jun 25, 2012, 7:00 PM MDT
In force: 94 min
Issued by: the Storm Prediction Center

Counties Carter County, MT, Custer County, MT, Fallon County, MT, Powder River County, MT, Custer County, SD, Lawrence County, SD, Crook County, WY, Weston County, WY

The radar

The Rapid City radar (KUDX), 156 km from the middle of the area, began a volume at 23:27 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

Rapid City, SD (KUNR), launched 12:00Z, 11.4 hours before the alert went out and 157 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, 2:09 PM MDT	Mesoscale Discussion	SPC	Carter, Custer, Dawson, Fallon, Powder River, Prairie and 2 more	2 hr
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

Nearby

Mesoscale Discussions in Montana, 2012 Mesoscale Discussions in South 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; radar from the NEXRAD Level II archive.