Alert archive / South Dakota / Mesoscale Discussions in 2008

Mesoscale Discussion 2065

August 10, 20084 states

The Storm Prediction Center issued this mesoscale discussion at Aug 10, 2008, 12:10 PM MDT for 4 states. It was in force for 95 min.

The area

The outline as issued.

The facts

Issued: Aug 10, 2008, 12:10 PM MDT (18:10 UTC)
Expired: Aug 10, 2008, 1:45 PM MDT
In force: 95 min
Issued by: the Storm Prediction Center

Counties Carter County, MT, Custer County, MT, Fallon County, MT, Wibaux County, MT, Adams County, ND, Bowman County, ND, Golden Valley County, ND, Slope County, ND, Butte County, SD, Custer County, SD, Harding County, SD, Lawrence County, SD, Meade County, SD, Pennington County, SD, Perkins County, SD, Crook County, WY, Weston County, WY

The radar

The Rapid City radar (KUDX), 137 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 820Aug 10, 12:50 PM MDT

The nearest sounding before it

Rapid City, SD (KUNR), launched 12:00Z, 6.2 hours before the alert went out and 140 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: 1256 J/kg
Mixed-layer CIN: -110 J/kg
Mixed-layer LCL: 1364 m above ground
0-6 km bulk shear: 13 kt
0-1 km storm-relative helicity: 37 m²/s²
0-3 km storm-relative helicity: 21 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
Aug 10, 12:46 PM MDT	Severe Thunderstorm Watch	SPC	Carter, Fallon, Powder River	9 hr
Aug 10, 4:28 PM MDT	Mesoscale Discussion	SPC	Carter, Dawson, Fallon, Powder River, Richland, Wibaux	62 min

Nearby

Mesoscale Discussions in South Dakota, 2008 Mesoscale Discussions in Montana, 2008 Mesoscale Discussions in North 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; radar from the NEXRAD Level II archive.