Alert archive / Montana / Mesoscale Discussions in 2013

Mesoscale Discussion 1045

June 12, 20135 counties in Montana; 4 counties in Wyoming

The Storm Prediction Center issued this mesoscale discussion at Jun 12, 2013, 4:06 PM MDT for 5 counties in Montana; 4 counties in Wyoming. It was in force for 54 min.

The area

The outline as issued.

The facts

Issued: Jun 12, 2013, 4:06 PM MDT (22:06 UTC)
Expired: Jun 12, 2013, 5:00 PM MDT
In force: 54 min
Issued by: the Storm Prediction Center
Chance of a watch: 40%

Counties Big Horn County, MT, Carter County, MT, Custer County, MT, Powder River County, MT, Rosebud County, MT, Campbell County, WY, Crook County, WY, Johnson County, WY, Sheridan County, WY

The radar

The Billings radar (KBLX), 219 km from the middle of the area, began a volume at 22:08 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

Riverton, WY (KRIW), launched 12:00Z, 10.1 hours before the alert went out and 297 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: 2227 m above ground
0-6 km bulk shear: 46 kt
0-1 km storm-relative helicity: 74 m²/s²
0-3 km storm-relative helicity: 95 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 11, 6:23 PM MDT	Mesoscale Discussion	SPC	Carter, Custer, Garfield, Powder River, Prairie, Rosebud and 1 more	97 min
Jun 12, 2:04 PM MDT	Mesoscale Discussion	SPC	Blaine, Broadwater, Cascade, Chouteau, Fergus, Gallatin and 14 more	56 min
Jun 12, 2:27 PM MDT	Severe Thunderstorm Watch	SPC	Blaine, Broadwater, Cascade, Chouteau, Fergus, Gallatin and 13 more	7 hr
Jun 12, 5:01 PM MDT	Mesoscale Discussion	SPC	Blaine, Broadwater, Cascade, Chouteau, Gallatin, Hill and 5 more	59 min
Jun 11, 8:16 PM MDT	Mesoscale Discussion	SPC	Weston	59 min

Nearby

Mesoscale Discussions in Montana, 2013 Mesoscale Discussions in Wyoming, 2013 Every mesoscale discussion in 2013

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.