Alert archive / Montana / Mesoscale Discussions in 2007

Mesoscale Discussion 1330

June 30, 200712 counties in Montana; 5 counties in Wyoming

The Storm Prediction Center issued this mesoscale discussion at Jun 30, 2007, 12:55 PM MDT for 12 counties in Montana; 5 counties in Wyoming. It was in force for 3 hr.

The area

The outline as issued.

The facts

Issued: Jun 30, 2007, 12:55 PM MDT (18:55 UTC)
Expired: Jun 30, 2007, 3:30 PM MDT
In force: 3 hr
Issued by: the Storm Prediction Center

Counties Big Horn County, MT, Broadwater County, MT, Carbon County, MT, Gallatin County, MT, Golden Valley County, MT, Jefferson County, MT, Madison County, MT, Park County, MT, Stillwater County, MT, Sweet Grass County, MT, Wheatland County, MT, Yellowstone County, MT, Big Horn County, WY, Hot Springs County, WY, Park County, WY, Sheridan County, WY, Washakie County, WY

The radar

The Billings radar (KBLX), 110 km from the middle of the area, began a volume at 18:53 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, 6.9 hours before the alert went out and 261 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: 1747 m above ground
0-6 km bulk shear: 42 kt
0-1 km storm-relative helicity: -34 m²/s²
0-3 km storm-relative helicity: 159 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 29, 8:44 PM MDT	Mesoscale Discussion	SPC	Blaine, Cascade, Chouteau, Fergus, Flathead, Glacier and 11 more	61 min
Jun 29, 10:22 PM MDT	Mesoscale Discussion	SPC	Blaine, Glacier, Hill, Liberty, Pondera, Teton and 1 more	23 min
Jun 30, 3:11 PM MDT	Mesoscale Discussion	SPC	Daniels, Richland, Roosevelt, Sheridan	2 hr

Nearby

Mesoscale Discussions in Montana, 2007 Mesoscale Discussions in Wyoming, 2007 Every mesoscale discussion in 2007

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.