Alert archive / South Dakota / Mesoscale Discussions in 2007

Mesoscale Discussion 1028

June 6, 20076 counties in Montana; 9 counties in South Dakota; 4 counties in Wyoming

The Storm Prediction Center issued this mesoscale discussion at Jun 6, 2007, 5:19 PM MDT for 6 counties in Montana; 9 counties in South Dakota; 4 counties in Wyoming. It was in force for 26 min.

The area

The outline as issued.

The facts

Issued: Jun 6, 2007, 5:19 PM MDT (23:19 UTC)
Expired: Jun 6, 2007, 5:45 PM MDT
In force: 26 min
Issued by: the Storm Prediction Center

Counties Big Horn County, MT, Carter County, MT, Custer County, MT, Fallon County, MT, Powder River County, MT, Rosebud County, MT, Butte County, SD, Custer County, SD, Fall River County, SD, Harding County, SD, Lawrence County, SD, Meade County, SD, Oglala Lakota County, SD, Pennington County, SD, Perkins County, SD, Campbell County, WY, Crook County, WY, Sheridan County, WY, Weston County, WY

The radar

The Billings radar (KBLX), 167 km from the middle of the area, began a volume at 23:19 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.

Tornado Watch 354Jun 6, 5:50 PM MDT

The nearest sounding before it

Glasgow Intl Airport, MT (KGGW), launched 12:00Z, 11.3 hours before the alert went out and 290 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: 1267 m above ground
0-6 km bulk shear: 20 kt
0-1 km storm-relative helicity: -2 m²/s²
0-3 km storm-relative helicity: 83 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 6, 1:28 AM MDT	Mesoscale Discussion	SPC	Richland, Roosevelt, Sheridan	92 min
Jun 6, 11:36 AM MDT	Mesoscale Discussion	SPC	Carter, Powder River	114 min
Jun 6, 12:04 PM MDT	Tornado Watch	SPC	Big Horn, Carter, Custer, Fallon, Powder River, Rosebud	6 hr
Jun 6, 5:47 PM MDT	Tornado Watch	SPC	Carter, Custer, Dawson, Fallon, Prairie, Richland and 1 more	7 hr
Jun 5, 6:22 PM MDT	Mesoscale Discussion	SPC	Bennett, Butte, Custer, Fall River, Jackson, Lawrence and 3 more	113 min
Jun 5, 10:47 PM MDT	Mesoscale Discussion	SPC	Buffalo, Corson, Dewey, Hughes, Hyde, Jones and 9 more	88 min
Jun 6, 2:31 PM MDT	Mesoscale Discussion	SPC	Bennett, Buffalo, Haakon, Hand, Hughes, Hyde and 9 more	119 min
Jun 6, 2:45 PM MDT	Tornado Watch	SPC	Bennett, Brule, Buffalo, Campbell, Corson, Dewey and 19 more	7 hr
Jun 6, 5:56 PM MDT	Mesoscale Discussion	SPC	Aurora, Beadle, Bennett, Bon Homme, Brule, Buffalo and 28 more	2 hr

Nearby

Mesoscale Discussions in South Dakota, 2007 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.