Alert archive / Wyoming / Mesoscale Discussions in 2005

Mesoscale Discussion 1108

June 1, 2005Powder River County, Montana; 6 counties in Wyoming

The Storm Prediction Center issued this mesoscale discussion at Jun 1, 2005, 12:07 PM MDT for Powder River County, Montana; 6 counties in Wyoming. It was in force for 113 min.

The area

The outline as issued.

The facts

Issued: Jun 1, 2005, 12:07 PM MDT (18:07 UTC)
Expired: Jun 1, 2005, 2:00 PM MDT
In force: 113 min
Issued by: the Storm Prediction Center

Counties Powder River County, MT, Big Horn County, WY, Campbell County, WY, Crook County, WY, Johnson County, WY, Sheridan County, WY, Washakie County, WY

The radar

The Riverton/Lander radar (KRIW), 187 km from the middle of the area, began a volume at 18:11 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.

Severe Thunderstorm Watch 373Jun 1, 1:40 PM MDT

The nearest sounding before it

Riverton, WY (KRIW), launched 12:00Z, 6.1 hours before the alert went out and 184 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: 1659 m above ground
0-6 km bulk shear: 47 kt
0-1 km storm-relative helicity: 77 m²/s²
0-3 km storm-relative helicity: 193 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 1, 1:40 PM MDT	Severe Thunderstorm Watch	SPC	Big Horn, Carter, Custer, Dawson, Fallon, Powder River and 4 more	6 hr
Jun 1, 5:11 PM MDT	Mesoscale Discussion	SPC	Carter, Custer, Dawson, Fallon, Powder River, Prairie and 2 more	94 min

Nearby

Mesoscale Discussions in Wyoming, 2005 Mesoscale Discussions in Montana, 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.