Alert archive / Wyoming / Mesoscale Discussions in 2014

Mesoscale Discussion 754

May 29, 2014Boulder County, Colorado; 12 counties in Wyoming

The Storm Prediction Center issued this mesoscale discussion at May 29, 2014, 1:54 PM MDT for Boulder County, Colorado; 12 counties in Wyoming. It was in force for 96 min.

The area

The outline as issued.

The facts

Issued: May 29, 2014, 1:54 PM MDT (19:54 UTC)
Expired: May 29, 2014, 3:30 PM MDT
In force: 96 min
Issued by: the Storm Prediction Center
Chance of a watch: 20%

Counties Boulder County, CO, Campbell County, WY, Converse County, WY, Fremont County, WY, Goshen County, WY, Hot Springs County, WY, Johnson County, WY, Laramie County, WY, Natrona County, WY, Niobrara County, WY, Platte County, WY, Washakie County, WY, Weston County, WY

The radar

The Cheyenne radar (KCYS), 174 km from the middle of the area, began a volume at 19:54 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 198May 29, 2:40 PM MDT

The nearest sounding before it

Rapid City, SD (KRAP), launched 12:00Z, 7.9 hours before the alert went out and 333 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: 18 J/kg
Mixed-layer CIN: -491 J/kg
Mixed-layer LCL: 2577 m above ground
0-6 km bulk shear: 19 kt
0-1 km storm-relative helicity: -16 m²/s²
0-3 km storm-relative helicity: -43 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, 6:28 PM MDT	Mesoscale Discussion	SPC	Sheridan	92 min
May 29, 2:15 PM MDT	Mesoscale Discussion	SPC	Crook	60 min
May 29, 2:45 PM MDT	Severe Thunderstorm Watch	SPC	Crook, Weston	6 hr
May 29, 5:25 PM MDT	Mesoscale Discussion	SPC	Weston	65 min

Nearby

Mesoscale Discussions in Wyoming, 2014 Mesoscale Discussions in Colorado, 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.