Alert archive / South Dakota / Mesoscale Discussions in 2009

Mesoscale Discussion 1385

June 30, 20094 states

The Storm Prediction Center issued this mesoscale discussion at Jun 30, 2009, 2:52 PM MDT for 4 states. It was in force for 83 min.

The area

The outline as issued.

The facts

Issued: Jun 30, 2009, 2:52 PM MDT (20:52 UTC)
Expired: Jun 30, 2009, 4:15 PM MDT
In force: 83 min
Issued by: the Storm Prediction Center

Counties Carter County, MT, Dawson County, MT, Fallon County, MT, Richland County, MT, Wibaux County, MT, Billings County, ND, Bowman County, ND, Golden Valley County, ND, Slope County, ND, Butte County, SD, Custer County, SD, Fall River County, SD, Harding County, SD, Lawrence County, SD, Pennington County, SD, Crook County, WY, Niobrara County, WY, Weston County, WY

The radar

The Rapid City radar (KUDX), 177 km from the middle of the area, began a volume at 20:53 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 535Jun 30, 3:20 PM MDT

The nearest sounding before it

Glasgow Intl Airport, MT (KGGW), launched 12:00Z, 8.9 hours before the alert went out and 365 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: 1193 J/kg
Mixed-layer CIN: -198 J/kg
Mixed-layer LCL: 1269 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: 118 m²/s²
0-3 km storm-relative helicity: 233 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.4

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 29, 6:26 PM MDT	Mesoscale Discussion	SPC	Richland, Sheridan	3 hr
Jun 30, 2:35 PM MDT	Mesoscale Discussion	SPC	Beaverhead, Big Horn, Carbon, Gallatin, Golden Valley, Madison and 7 more	55 min
Jun 30, 3:19 PM MDT	Severe Thunderstorm Watch	SPC	Carter, Dawson, Fallon, Prairie, Richland, Roosevelt and 2 more	7 hr

Nearby

Mesoscale Discussions in South Dakota, 2009 Mesoscale Discussions in Montana, 2009 Mesoscale Discussions in North Dakota, 2009 Every mesoscale discussion in 2009

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.