Alert archive / South Dakota / Mesoscale Discussions in 2006

Mesoscale Discussion 1013

May 28, 20067 counties in Nebraska; 14 counties in South Dakota; Goshen County, Wyoming

The Storm Prediction Center issued this mesoscale discussion at May 28, 2006, 4:42 PM MDT for 7 counties in Nebraska; 14 counties in South Dakota; Goshen County, Wyoming. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: May 28, 2006, 4:42 PM MDT (22:42 UTC)
Expired: May 28, 2006, 6:45 PM MDT
In force: 2 hr
Issued by: the Storm Prediction Center

All 22 counties

Banner County, NE, Box Butte County, NE, Dawes County, NE, Morrill County, NE, Scotts Bluff County, NE, Sheridan County, NE, Sioux County, NE, Bennett County, SD, Butte County, SD, Custer County, SD, Dewey 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, Perkins County, SD, Stanley County, SD, Ziebach County, SD, Goshen County, WY

The radar

The Rapid City radar (KUDX), 82 km from the middle of the area, began a volume at 22:45 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 417May 28, 5:10 PM MDT

The nearest sounding before it

Rapid City, SD (KUNR), launched 12:00Z, 10.7 hours before the alert went out and 77 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: 1 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1741 m above ground
0-6 km bulk shear: 59 kt
0-1 km storm-relative helicity: -77 m²/s²
0-3 km storm-relative helicity: -33 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
May 28, 5:10 PM MDT	Severe Thunderstorm Watch	SPC	Box Butte, Cherry, Dawes, Sheridan, Sioux	7 hr
May 28, 5:42 PM MDT	Mesoscale Discussion	SPC	Antelope, Boyd, Holt, Knox, Pierce	93 min

Nearby

Mesoscale Discussions in South Dakota, 2006 Mesoscale Discussions in Nebraska, 2006 Mesoscale Discussions in Wyoming, 2006 Every mesoscale discussion in 2006

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.