Alert archive / Nebraska / Mesoscale Discussions in 2015

Mesoscale Discussion 1485

July 19, 2015Phillips County, Sedgwick County, Colorado; 16 counties in Nebraska

The Storm Prediction Center issued this mesoscale discussion at Jul 19, 2015, 4:43 PM MDT for Phillips County, Sedgwick County, Colorado; 16 counties in Nebraska. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Jul 19, 2015, 4:43 PM MDT (22:43 UTC)
Expired: Jul 19, 2015, 6:45 PM MDT
In force: 2 hr
Issued by: the Storm Prediction Center
Chance of a watch: 40%

Counties Phillips County, CO, Sedgwick County, CO, Arthur County, NE, Chase County, NE, Custer County, NE, Dawson County, NE, Deuel County, NE, Frontier County, NE, Gosper County, NE, Hayes County, NE, Hooker County, NE, Keith County, NE, Lincoln County, NE, Logan County, NE, McPherson County, NE, Perkins County, NE, Phelps County, NE, Thomas County, NE

The radar

The North Platte radar (KLNX), 101 km from the middle of the area, began a volume at 22:45 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, 10.7 hours before the alert went out and 233 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: 1387 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: 14 m²/s²
0-3 km storm-relative helicity: 40 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 19, 1:18 PM MDT	Mesoscale Discussion	SPC	Baca, Bent, Cheyenne, Crowley, Kiowa, Kit Carson and 5 more	117 min
Jul 19, 2:37 PM MDT	Severe Thunderstorm Watch	SPC	Baca, Bent, Cheyenne, Crowley, Elbert, El Paso and 10 more	8 hr
Jul 18, 6:41 PM MDT	Severe Thunderstorm Watch	SPC	Arthur, Chase, Deuel, Dundy, Frontier, Garden and 8 more	6 hr
Jul 18, 7:30 PM MDT	Mesoscale Discussion	SPC	Nemaha, Pawnee, Richardson	60 min
Jul 18, 9:54 PM MDT	Mesoscale Discussion	SPC	Frontier, Hayes, Hitchcock, Lincoln, Red Willow	96 min
Jul 19, 4:40 PM MDT	Mesoscale Discussion	SPC	Antelope, Blaine, Brown, Cherry, Garfield, Holt and 5 more	95 min

Nearby

Mesoscale Discussions in Nebraska, 2015 Mesoscale Discussions in Colorado, 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.