Alert archive / Wyoming / Mesoscale Discussions in 2005

Mesoscale Discussion 1198

June 6, 2005Big Horn County, Powder River County, Montana; Custer County, Lawrence County, South Dakota; 10 counties in Wyoming

The Storm Prediction Center issued this mesoscale discussion at Jun 6, 2005, 11:29 AM MDT for Big Horn County, Powder River County, Montana; Custer County, Lawrence County, South Dakota; 10 counties in Wyoming. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Jun 6, 2005, 11:29 AM MDT (17:29 UTC)
Expired: Jun 6, 2005, 1:30 PM MDT
In force: 2 hr
Issued by: the Storm Prediction Center

Counties Big Horn County, MT, Powder River County, MT, Custer County, SD, Lawrence County, SD, Big Horn County, WY, Campbell County, WY, Converse County, WY, Crook County, WY, Hot Springs County, WY, Johnson County, WY, Niobrara County, WY, Sheridan County, WY, Washakie County, WY, Weston County, WY

The radar

The Riverton/Lander radar (KRIW), 226 km from the middle of the area, began a volume at 17:31 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

Riverton, WY (KRIW), launched 12:00Z, 5.5 hours before the alert went out and 221 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: 2339 m above ground
0-6 km bulk shear: 47 kt
0-1 km storm-relative helicity: 158 m²/s²
0-3 km storm-relative helicity: 210 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, 12:20 PM MDT	Tornado Watch	SPC	Big Horn, Carter, Custer, Fallon, Powder River, Rosebud and 2 more	6 hr
Jun 6, 2:00 PM MDT	Tornado Watch	SPC	Carter	8 hr
Jun 6, 2:15 PM MDT	Mesoscale Discussion	SPC	Dawson, Garfield, McCone, Prairie, Richland, Roosevelt and 2 more	2 hr
Jun 6, 4:15 PM MDT	Tornado Watch	SPC	Dawson, Garfield, McCone, Phillips, Prairie, Richland and 3 more	7 hr
Jun 6, 5:28 PM MDT	Mesoscale Discussion	SPC	Carter, Custer, Fallon, Powder River, Rosebud	62 min
Jun 6, 1:22 PM MDT	Mesoscale Discussion	SPC	Bennett, Custer, Fall River, Haakon, Jackson, Meade and 6 more	113 min
Jun 6, 4:58 PM MDT	Mesoscale Discussion	SPC	Bennett, Butte, Custer, Dewey, Gregory, Haakon and 14 more	92 min

Nearby

Mesoscale Discussions in Wyoming, 2005 Mesoscale Discussions in Montana, 2005 Mesoscale Discussions in South Dakota, 2005 Every mesoscale discussion in 2005

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.