Alert archive / Nebraska / Mesoscale Discussions in 2011

Mesoscale Discussion 1307

June 19, 2011Phillips County, Sedgwick County, Colorado; 41 counties in Nebraska

The Storm Prediction Center issued this mesoscale discussion at Jun 19, 2011, 7:24 PM MDT for Phillips County, Sedgwick County, Colorado; 41 counties in Nebraska. It was in force for 96 min.

The area

The outline as issued.

The facts

Issued
Jun 19, 2011, 7:24 PM MDT (01:24 UTC)
Expired
Jun 19, 2011, 9:00 PM MDT
In force
96 min
Issued by
the Storm Prediction Center
All 43 counties

Phillips County, CO, Sedgwick County, CO, Adams County, NE, Blaine County, NE, Boone County, NE, Buffalo County, NE, Chase County, NE, Clay County, NE, Custer County, NE, Dawson County, NE, Deuel County, NE, Dundy County, NE, Franklin County, NE, Frontier County, NE, Furnas County, NE, Garfield County, NE, Gosper County, NE, Greeley County, NE, Hall County, NE, Hamilton County, NE, Harlan County, NE, Hayes County, NE, Hitchcock County, NE, Howard County, NE, Kearney County, NE, Keith County, NE, Lincoln County, NE, Logan County, NE, Loup County, NE, McPherson County, NE, Merrick County, NE, Nance County, NE, Perkins County, NE, Phelps County, NE, Platte County, NE, Polk County, NE, Red Willow County, NE, Sherman County, NE, Thomas County, NE, Valley County, NE, Webster County, NE, Wheeler County, NE, York County, NE

The radar

The North Platte radar (KLNX), 109 km from the middle of the area, began a volume at 01:24 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.

The nearest sounding before it

N. Platte/Lee Bi, NE (KLBF), launched 00:00Z, 1.4 hours before the alert went out and 50 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-pSkew-T log-p diagram, N. Platte/Lee Bi, NE at 00:00Z on 2011-06-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1727 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, N. Platte/Lee Bi, NE at 00:00Z on 2011-06-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 121 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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
1727 J/kg
Mixed-layer CIN
-21 J/kg
Mixed-layer LCL
1157 m above ground
0-6 km bulk shear
44 kt
0-1 km storm-relative helicity
121 m²/s²
0-3 km storm-relative helicity
293 m²/s²
Significant tornado parameter
2.2
Supercell composite
17.6

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.

IssuedProductOfficeCountiesLasted
Jun 20, 7:05 AM MDTMesoscale DiscussionSPCBaca, Bent, Cheyenne, Kiowa, Prowers55 min
Jun 19, 8:16 PM MDTMesoscale DiscussionSPCBurt, Cass, Dodge, Douglas, Lancaster, Nemaha and 4 more59 min
Jun 19, 8:49 PM MDTTornado WatchSPCAdams, Antelope, Boone, Buffalo, Burt, Butler and 46 more6 hr
Jun 19, 11:45 PM MDTSevere Thunderstorm WatchSPCChase, Dundy, Frontier, Hayes, Hitchcock, Red Willow2 hr
Jun 20, 2:27 AM MDTMesoscale DiscussionSPCBurt, Butler, Cass, Colfax, Cuming, Dodge and 11 more33 min
Jun 20, 2:46 AM MDTSevere Thunderstorm WatchSPCBurt, Butler, Cass, Colfax, Cuming, Dodge and 10 more5 hr
Jun 20, 7:38 AM MDTSevere Thunderstorm WatchSPCAdams, Buffalo, Dawson, Franklin, Frontier, Furnas and 8 more6 hr
Jun 20, 11:22 AM MDTMesoscale DiscussionSPCAdams, Boone, Buffalo, Clay, Custer, Dawson and 17 more83 min
Jun 20, 12:00 PM MDTTornado Watch PDSSPCAdams, Antelope, Boone, Buffalo, Butler, Clay and 34 more10 hr
Jun 20, 1:19 PM MDTMesoscale DiscussionSPCAdams, Boone, Buffalo, Clay, Dawson, Franklin and 17 more86 min
Jun 20, 1:52 PM MDTMesoscale DiscussionSPCHayes, Hitchcock, Lincoln, Logan, Red Willow53 min
Jun 20, 2:08 PM MDTTornado WatchSPCBurt, Cass, Dodge, Douglas, Gage, Jefferson and 12 more7 hr
Jun 20, 2:59 PM MDTMesoscale DiscussionSPCAdams, Antelope, Boone, Buffalo, Clay, Custer and 21 more61 min
Jun 20, 5:17 PM MDTMesoscale DiscussionSPCAntelope, Boone, Buffalo, Burt, Butler, Cass and 51 more58 min
Jun 20, 5:53 PM MDTTornado WatchSPCAntelope, Boone, Boyd, Burt, Butler, Cass and 29 more6 hr

Nearby

Mesoscale Discussions in Nebraska, 2011Mesoscale Discussions in Colorado, 2011Every mesoscale discussion in 2011

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.