Alert archive / Colorado / Mesoscale Discussions in 2014

Mesoscale Discussion 1603

August 23, 20144 states

The Storm Prediction Center issued this mesoscale discussion at Aug 23, 2014, 1:07 PM MDT for 4 states. It was in force for 113 min.

The area

The outline as issued.

The facts

Issued: Aug 23, 2014, 1:07 PM MDT (19:07 UTC)
Expired: Aug 23, 2014, 3:00 PM MDT
In force: 113 min
Issued by: the Storm Prediction Center
Chance of a watch: 20%

All 27 counties

Adams County, CO, Arapahoe County, CO, Boulder County, CO, Broomfield County, CO, Denver County, CO, Elbert County, CO, Jefferson County, CO, Larimer County, CO, Logan County, CO, Morgan County, CO, Washington County, CO, Weld County, CO, Banner County, NE, Box Butte County, NE, Cheyenne 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, Oglala Lakota County, SD, Goshen County, WY, Laramie County, WY, Niobrara County, WY, Weston County, WY

The radar

The Cheyenne radar (KCYS), 108 km from the middle of the area, began a volume at 19:09 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 (KDEN), launched 12:00Z, 7.1 hours before the alert went out and 261 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: 70 J/kg
Mixed-layer CIN: -148 J/kg
Mixed-layer LCL: 1113 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: 14 m²/s²
0-3 km storm-relative helicity: 25 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
Aug 22, 6:48 PM MDT	Mesoscale Discussion	SPC	Kit Carson, Phillips, Sedgwick, Washington, Yuma	117 min
Aug 23, 2:49 PM MDT	Mesoscale Discussion	SPC	Beadle, Brown, Campbell, Clark, Codington, Day and 15 more	116 min
Aug 23, 5:15 PM MDT	Tornado Watch	SPC	Brown, Clark, Day, Edmunds, Faulk, McPherson and 2 more	4 hr

Nearby

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