Alert archive / Nebraska / Mesoscale Discussions in 2011

Mesoscale Discussion 1184

June 11, 20119 counties in Nebraska; 7 counties in South Dakota; Crook County, Niobrara County, Weston County, Wyoming

The Storm Prediction Center issued this mesoscale discussion at Jun 11, 2011, 1:40 PM MDT for 9 counties in Nebraska; 7 counties in South Dakota; Crook County, Niobrara County, Weston County, Wyoming. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Jun 11, 2011, 1:40 PM MDT (19:40 UTC)
Expired: Jun 11, 2011, 3:45 PM MDT
In force: 2 hr
Issued by: the Storm Prediction Center

Counties Banner County, NE, Box Butte County, NE, Dawes County, NE, Garden County, NE, Grant County, NE, Morrill County, NE, Scotts Bluff County, NE, Sheridan County, NE, Sioux County, NE, Butte County, SD, Custer County, SD, Fall River County, SD, Lawrence County, SD, Meade County, SD, Oglala Lakota County, SD, Pennington County, SD, Crook County, WY, Niobrara County, WY, Weston County, WY

The radar

The Rapid City radar (KUDX), 130 km from the middle of the area, began a volume at 19:40 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.

The nearest sounding before it

Rapid City, SD (KUNR), launched 12:00Z, 7.7 hours before the alert went out and 123 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 685 m above ground
0-6 km bulk shear: 43 kt
0-1 km storm-relative helicity: 63 m²/s²
0-3 km storm-relative helicity: 193 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
Jun 11, 3:35 PM MDT	Severe Thunderstorm Watch	SPC	Arthur, Banner, Box Butte, Chase, Cheyenne, Dawes and 11 more	6 hr
Jun 11, 3:59 PM MDT	Tornado Watch	SPC	Bennett, Butte, Custer, Fall River, Haakon, Harding and 6 more	7 hr

Nearby

Mesoscale Discussions in Nebraska, 2011 Mesoscale Discussions in South Dakota, 2011 Mesoscale Discussions in Wyoming, 2011 Every mesoscale discussion in 2011

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.