Alert archive / Colorado / Mesoscale Discussions in 2015

Mesoscale Discussion 871

June 3, 201510 counties in Colorado; Banner County, Kimball County, Scotts Bluff County, Nebraska; 8 counties in Wyoming

The Storm Prediction Center issued this mesoscale discussion at Jun 3, 2015, 12:34 PM MDT for 10 counties in Colorado; Banner County, Kimball County, Scotts Bluff County, Nebraska; 8 counties in Wyoming. It was in force for 86 min.

The area

The outline as issued.

The facts

Issued: Jun 3, 2015, 12:34 PM MDT (18:34 UTC)
Expired: Jun 3, 2015, 2:00 PM MDT
In force: 86 min
Issued by: the Storm Prediction Center
Chance of a watch: 80%

All 21 counties

Adams County, CO, Arapahoe County, CO, Broomfield County, CO, Denver County, CO, Elbert County, CO, Larimer County, CO, Logan County, CO, Morgan County, CO, Washington County, CO, Weld County, CO, Banner County, NE, Kimball County, NE, Scotts Bluff County, NE, Albany County, WY, Campbell County, WY, Converse County, WY, Goshen County, WY, Laramie County, WY, Niobrara County, WY, Platte County, WY, Weston County, WY

The radar

The Cheyenne radar (KCYS), 95 km from the middle of the area, began a volume at 18:31 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.

Tornado Watch 251Jun 3, 2:00 PM MDT

The nearest sounding before it

Denver, CO (KDEN), launched 12:00Z, 6.6 hours before the alert went out and 274 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: 67 J/kg
Mixed-layer CIN: -335 J/kg
Mixed-layer LCL: 1609 m above ground
0-6 km bulk shear: 43 kt
0-1 km storm-relative helicity: -7 m²/s²
0-3 km storm-relative helicity: 11 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 3, 2:01 AM MDT	Mesoscale Discussion	SPC	Sedgwick	89 min
Jun 3, 2:03 PM MDT	Tornado Watch	SPC	Adams, Arapahoe, Boulder, Broomfield, Denver, Douglas and 6 more	7 hr
Jun 2, 8:01 PM MDT	Mesoscale Discussion	SPC	Arthur, Blaine, Boyd, Brown, Cherry, Custer and 17 more	89 min
Jun 2, 8:25 PM MDT	Severe Thunderstorm Watch	SPC	Blaine, Boyd, Brown, Buffalo, Custer, Dawson and 14 more	5 hr
Jun 2, 10:57 PM MDT	Mesoscale Discussion	SPC	Blaine, Boyd, Brown, Custer, Garfield, Greeley and 8 more	2 hr
Jun 3, 12:03 AM MDT	Severe Thunderstorm Watch	SPC	Adams, Buffalo, Clay, Dawson, Fillmore, Greeley and 11 more	3 hr
Jun 3, 3:05 PM MDT	Mesoscale Discussion	SPC	Franklin, Furnas, Harlan, Webster	115 min
Jun 3, 5:33 PM MDT	Tornado Watch	SPC	Adams, Clay, Fillmore, Franklin, Furnas, Gage and 11 more	7 hr

Nearby

Mesoscale Discussions in Colorado, 2015 Mesoscale Discussions in Wyoming, 2015 Mesoscale Discussions in Nebraska, 2015 Every mesoscale discussion in 2015

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.