Alert archive / Nebraska / Mesoscale Discussions in 2014

Mesoscale Discussion 1093

June 20, 201433 counties in Nebraska

The Storm Prediction Center issued this mesoscale discussion at Jun 20, 2014, 11:02 AM CDT for 33 counties in Nebraska. It was in force for 118 min.

The area

The outline as issued.

The facts

Issued: Jun 20, 2014, 11:02 AM CDT (16:02 UTC)
Expired: Jun 20, 2014, 1:00 PM CDT
In force: 118 min
Issued by: the Storm Prediction Center
Chance of a watch: 40%

All 33 counties

Antelope County, NE, Blaine County, NE, Boone County, NE, Buffalo County, NE, Butler County, NE, Colfax County, NE, Custer County, NE, Dawson County, NE, Frontier County, NE, Garfield County, NE, Gosper County, NE, Greeley County, NE, Hall County, NE, Hamilton County, NE, Holt County, NE, Howard County, NE, Kearney County, NE, Lincoln County, NE, Logan County, NE, Loup County, NE, Madison County, NE, Merrick County, NE, Nance County, NE, Phelps County, NE, Pierce County, NE, Platte County, NE, Polk County, NE, Red Willow County, NE, Sherman County, NE, Stanton County, NE, Valley County, NE, Wheeler County, NE, York County, NE

The radar

The North Platte radar (KLNX), 118 km from the middle of the area, began a volume at 16:04 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 336Jun 20, 2:20 PM CDT

The nearest sounding before it

N. Platte/Lee Bi, NE (KLBF), launched 12:00Z, 4.0 hours before the alert went out and 110 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: 641 J/kg
Mixed-layer CIN: -158 J/kg
Mixed-layer LCL: 1345 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 264 m²/s²
0-3 km storm-relative helicity: 301 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 11.0

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 20, 2:20 PM CDT	Severe Thunderstorm Watch	SPC	Adams, Antelope, Arthur, Blaine, Boone, Buffalo and 63 more	9 hr
Jun 20, 5:40 PM CDT	Mesoscale Discussion	SPC	Adams, Antelope, Boone, Burt, Butler, Cass and 38 more	95 min
Jun 20, 5:44 PM CDT	Severe Thunderstorm Watch	SPC	Douglas, Sarpy, Washington	5 hr

Nearby

Mesoscale Discussions in Nebraska, 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.