Alert archive / Wyoming / Mesoscale Discussions in 2014

Mesoscale Discussion 767

May 31, 2014Scotts Bluff County, Sioux County, Nebraska; Custer County, Fall River County, Lawrence County, South Dakota; 7 counties in Wyoming

The Storm Prediction Center issued this mesoscale discussion at May 31, 2014, 4:49 PM MDT for Scotts Bluff County, Sioux County, Nebraska; Custer County, Fall River County, Lawrence County, South Dakota; 7 counties in Wyoming. It was in force for 86 min.

The area

The outline as issued.

The facts

Issued: May 31, 2014, 4:49 PM MDT (22:49 UTC)
Expired: May 31, 2014, 6:15 PM MDT
In force: 86 min
Issued by: the Storm Prediction Center
Chance of a watch: 60%

Counties 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, Niobrara County, WY, Platte County, WY, Weston County, WY

The radar

The Cheyenne radar (KCYS), 195 km from the middle of the area, began a volume at 22:51 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 200May 31, 5:05 PM MDT

The nearest sounding before it

Rapid City, SD (KRAP), launched 12:00Z, 10.8 hours before the alert went out and 188 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: 188 J/kg
Mixed-layer CIN: -34 J/kg
Mixed-layer LCL: 516 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: 40 m²/s²
0-3 km storm-relative helicity: 56 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 31, 12:18 PM MDT	Mesoscale Discussion	SPC	Cedar, Dakota, Dixon, Knox	117 min
May 31, 5:02 PM MDT	Severe Thunderstorm Watch	SPC	Scotts Bluff, Sioux	3 hr
May 31, 1:34 PM MDT	Mesoscale Discussion	SPC	Campbell, Converse, Goshen, Laramie, Niobrara, Platte and 1 more	116 min
May 31, 2:22 PM MDT	Severe Thunderstorm Watch	SPC	Sheridan	7 hr

Nearby

Mesoscale Discussions in Wyoming, 2014 Mesoscale Discussions in South Dakota, 2014 Mesoscale Discussions in Nebraska, 2014 Every mesoscale discussion in 2014

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.