Alert archive / Wyoming / Mesoscale Discussions in 2008

Mesoscale Discussion 1698

July 6, 20084 counties in Montana; Custer County, Lawrence County, South Dakota; 10 counties in Wyoming

The Storm Prediction Center issued this mesoscale discussion at Jul 6, 2008, 1:14 PM MDT for 4 counties in Montana; Custer County, Lawrence County, South Dakota; 10 counties in Wyoming. It was in force for 61 min.

The area

The outline as issued.

The facts

Issued: Jul 6, 2008, 1:14 PM MDT (19:14 UTC)
Expired: Jul 6, 2008, 2:15 PM MDT
In force: 61 min
Issued by: the Storm Prediction Center

Counties Big Horn County, MT, Carbon County, MT, Carter County, MT, Powder River County, MT, Custer County, SD, Lawrence County, SD, Big Horn County, WY, Campbell County, WY, Crook County, WY, Hot Springs County, WY, Johnson County, WY, Natrona County, WY, Park County, WY, Sheridan County, WY, Washakie County, WY, Weston County, WY

The watches that followed

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

Severe Thunderstorm Watch 660Jul 6, 1:35 PM MDT

The nearest sounding before it

Riverton, WY (KRIW), launched 12:00Z, 7.2 hours before the alert went out and 186 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: 544 J/kg
Mixed-layer CIN: -173 J/kg
Mixed-layer LCL: 1453 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: 41 m²/s²
0-3 km storm-relative helicity: 117 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.7

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
Jul 6, 1:32 PM MDT	Severe Thunderstorm Watch	SPC	Big Horn, Carbon, Carter, Custer, Fallon, Powder River and 3 more	7 hr
Jul 6, 1:36 PM MDT	Mesoscale Discussion	SPC	Clay, Lincoln, Turner, Union, Yankton	114 min
Jul 6, 2:05 PM MDT	Severe Thunderstorm Watch	SPC	Clay, Union	7 hr

Nearby

Mesoscale Discussions in Wyoming, 2008 Mesoscale Discussions in Montana, 2008 Mesoscale Discussions in South Dakota, 2008 Every mesoscale discussion in 2008

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.