Alert archive / Nebraska / Mesoscale Discussions in 2014

Mesoscale Discussion 1399

July 15, 2014Logan County, Weld County, Colorado; 5 counties in Nebraska; 4 counties in Wyoming

The Storm Prediction Center issued this mesoscale discussion at Jul 15, 2014, 10:33 PM MDT for Logan County, Weld County, Colorado; 5 counties in Nebraska; 4 counties in Wyoming. It was in force for 87 min.

The area

The outline as issued.

The facts

Issued: Jul 15, 2014, 10:33 PM MDT (04:33 UTC)
Expired: Jul 16, 2014, 12:00 AM MDT
In force: 87 min
Issued by: the Storm Prediction Center

Counties Logan County, CO, Weld County, CO, Banner County, NE, Cheyenne County, NE, Kimball County, NE, Scotts Bluff County, NE, Sioux County, NE, Albany County, WY, Goshen County, WY, Laramie County, WY, Platte County, WY

The radar

The Cheyenne radar (KCYS), 43 km from the middle of the area, began a volume at 04:35 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

Rapid City, SD (KRAP), launched 00:00Z, 4.6 hours before the alert went out and 320 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1755 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: -45 m²/s²
0-3 km storm-relative helicity: 102 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
Jul 16, 12:33 PM MDT	Mesoscale Discussion	SPC	Adams, Arapahoe, Bent, Boulder, Broomfield, Crowley and 16 more	87 min
Jul 16, 2:16 PM MDT	Mesoscale Discussion	SPC	Baca	89 min
Jul 15, 8:26 PM MDT	Mesoscale Discussion	SPC	Scotts Bluff, Sioux	34 min
Jul 15, 8:34 PM MDT	Severe Thunderstorm Watch	SPC	Banner, Kimball, Scotts Bluff, Sioux	4 hr

Nearby

Mesoscale Discussions in Nebraska, 2014 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.