Alert archive / Montana / Mesoscale Discussions in 2010

Mesoscale Discussion 973

June 16, 20104 states

The Storm Prediction Center issued this mesoscale discussion at Jun 16, 2010, 2:31 PM MDT for 4 states. It was in force for 89 min.

The area

The outline as issued.

The facts

Issued: Jun 16, 2010, 2:31 PM MDT (20:31 UTC)
Expired: Jun 16, 2010, 4:00 PM MDT
In force: 89 min
Issued by: the Storm Prediction Center

All 31 counties

Big Horn County, MT, Carter County, MT, Custer County, MT, Dawson County, MT, Fallon 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, Richland County, MT, Rosebud County, MT, Stillwater County, MT, Treasure County, MT, Wibaux County, MT, Yellowstone County, MT, Adams County, ND, Billings County, ND, Bowman County, ND, Golden Valley County, ND, Hettinger County, ND, Slope County, ND, Stark County, ND, Butte County, SD, Harding County, SD, Lawrence County, SD, Meade County, SD, Perkins County, SD, Crook County, WY

The radar

The Billings radar (KBLX), 250 km from the middle of the area, began a volume at 20:31 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 watches that followed

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

The nearest sounding before it

Bismarck Municip, ND (KBIS), launched 12:00Z, 8.5 hours before the alert went out and 370 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: 1421 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: 49 m²/s²
0-3 km storm-relative helicity: 67 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 15, 6:29 PM MDT	Mesoscale Discussion	SPC	Big Horn, Blaine, Carbon, Chouteau, Fergus, Garfield and 10 more	61 min
Jun 16, 12:29 PM MDT	Mesoscale Discussion	SPC	Park, Stillwater	91 min
Jun 16, 3:30 PM MDT	Tornado Watch	SPC	Big Horn, Carbon, Carter, Custer, Fallon, Fergus and 7 more	8 hr
Jun 16, 5:34 PM MDT	Mesoscale Discussion	SPC	Dawson, Garfield, McCone, Phillips, Richland, Roosevelt and 2 more	86 min
Jun 16, 4:01 PM MDT	Tornado Watch	SPC	Bennett, Haakon, Jackson, Mellette, Todd	7 hr
Jun 16, 1:38 PM MDT	Mesoscale Discussion	SPC	Campbell, Converse, Crook, Goshen, Johnson, Laramie and 4 more	67 min

Nearby

Mesoscale Discussions in Montana, 2010 Mesoscale Discussions in North Dakota, 2010 Mesoscale Discussions in South Dakota, 2010 Every mesoscale discussion in 2010

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.