Alert archive / Wyoming / Mesoscale Discussions in 2011

Mesoscale Discussion 1384

June 25, 20117 counties in Nebraska; Custer County, Fall River County, Lawrence County, South Dakota; 8 counties in Wyoming

The Storm Prediction Center issued this mesoscale discussion at Jun 25, 2011, 1:24 PM MDT for 7 counties in Nebraska; Custer County, Fall River County, Lawrence County, South Dakota; 8 counties in Wyoming. It was in force for 96 min.

The area

The outline as issued.

The facts

Issued: Jun 25, 2011, 1:24 PM MDT (19:24 UTC)
Expired: Jun 25, 2011, 3:00 PM MDT
In force: 96 min
Issued by: the Storm Prediction Center

Counties Banner County, NE, Box Butte County, NE, Dawes County, NE, Kimball County, NE, Morrill County, NE, Scotts Bluff County, NE, Sioux County, NE, Custer County, SD, Fall River County, SD, Lawrence County, SD, Campbell County, WY, Converse County, WY, Crook County, WY, Goshen County, WY, Laramie County, WY, Niobrara County, WY, Platte County, WY, Weston County, WY

The radar

The Cheyenne radar (KCYS), 175 km from the middle of the area, began a volume at 19:24 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

Denver, CO (KDNR), launched 12:00Z, 7.4 hours before the alert went out and 347 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: 1055 J/kg
Mixed-layer CIN: -175 J/kg
Mixed-layer LCL: 669 m above ground
0-6 km bulk shear: 39 kt
0-1 km storm-relative helicity: -72 m²/s²
0-3 km storm-relative helicity: 23 m²/s²
Significant tornado parameter: -0.0
Supercell composite: -0.6

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 25, 12:46 AM MDT	Mesoscale Discussion	SPC	Adams, Buffalo, Clay, Fillmore, Gage, Hall and 15 more	89 min
Jun 25, 5:21 PM MDT	Mesoscale Discussion	SPC	Arthur, Box Butte, Cherry, Dawes, Garden, Grant and 5 more	84 min

Nearby

Mesoscale Discussions in Wyoming, 2011 Mesoscale Discussions in Nebraska, 2011 Mesoscale Discussions in South Dakota, 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.