Alert archive / South Dakota / Mesoscale Discussions in 2009

Mesoscale Discussion 1328

June 25, 200911 counties in South Dakota

The Storm Prediction Center issued this mesoscale discussion at Jun 25, 2009, 6:33 PM MDT for 11 counties in South Dakota. It was in force for 57 min.

The area

The outline as issued.

The facts

Issued: Jun 25, 2009, 6:33 PM MDT (00:33 UTC)
Expired: Jun 25, 2009, 7:30 PM MDT
In force: 57 min
Issued by: the Storm Prediction Center

Counties Bennett County, SD, Butte County, SD, Custer County, SD, Fall River County, SD, Haakon County, SD, Jackson County, SD, Lawrence County, SD, Meade County, SD, Oglala Lakota County, SD, Pennington County, SD, Ziebach County, SD

The radar

The Rapid City radar (KUDX), 23 km from the middle of the area, began a volume at 00:33 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 nearest sounding before it

Rapid City, SD (KUNR), launched 00:00Z, 0.6 hours before the alert went out and 28 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: 1782 J/kg
Mixed-layer CIN: -21 J/kg
Mixed-layer LCL: 2284 m above ground
0-6 km bulk shear: 40 kt
0-1 km storm-relative helicity: 50 m²/s²
0-3 km storm-relative helicity: 62 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.6

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 26, 1:13 PM MDT	Mesoscale Discussion	SPC	Butte, Campbell, Corson, Custer, Dewey, Haakon and 7 more	62 min
Jun 26, 1:53 PM MDT	Severe Thunderstorm Watch	SPC	Bennett, Butte, Campbell, Corson, Custer, Dewey and 14 more	7 hr
Jun 26, 5:05 PM MDT	Mesoscale Discussion	SPC	Bennett, Haakon, Jackson, Jones, Mellette, Stanley and 3 more	85 min
Jun 26, 5:24 PM MDT	Tornado Watch	SPC	Aurora, Beadle, Bennett, Brown, Brule, Buffalo and 27 more	4 hr

Nearby

Mesoscale Discussions in South 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.