Alert archive / Nebraska / Mesoscale Discussions in 2011

Mesoscale Discussion 1318

June 20, 201112 counties in Kansas; 23 counties in Nebraska

The Storm Prediction Center issued this mesoscale discussion at Jun 20, 2011, 12:22 PM CDT for 12 counties in Kansas; 23 counties in Nebraska. It was in force for 83 min.

The area

The outline as issued.

The facts

Issued
Jun 20, 2011, 12:22 PM CDT (17:22 UTC)
Expired
Jun 20, 2011, 1:45 PM CDT
In force
83 min
Issued by
the Storm Prediction Center
All 35 counties

Decatur County, KS, Gove County, KS, Graham County, KS, Logan County, KS, Norton County, KS, Phillips County, KS, Rawlins County, KS, Rooks County, KS, Sheridan County, KS, Smith County, KS, Thomas County, KS, Trego County, KS, Adams County, NE, Boone County, NE, Buffalo County, NE, Clay County, NE, Custer County, NE, Dawson County, NE, Franklin County, NE, Frontier County, NE, Furnas County, NE, Gosper County, NE, Greeley County, NE, Hall County, NE, Hamilton County, NE, Harlan County, NE, Howard County, NE, Kearney County, NE, Merrick County, NE, Nance County, NE, Phelps County, NE, Red Willow County, NE, Sherman County, NE, Valley County, NE, Webster County, NE

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 12:00Z, 5.4 hours before the alert went out and 144 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 12:00Z on 2011-06-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 163 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 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 12:00Z on 2011-06-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 159 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
163 J/kg
Mixed-layer CIN
-253 J/kg
Mixed-layer LCL
570 m above ground
0-6 km bulk shear
51 kt
0-1 km storm-relative helicity
159 m²/s²
0-3 km storm-relative helicity
34 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.5

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, 8:05 AM CDTMesoscale DiscussionSPCCheyenne, Decatur, Finney, Gove, Graham, Grant and 15 more55 min
Jun 20, 8:38 AM CDTSevere Thunderstorm WatchSPCDecatur, Ellis, Finney, Gove, Graham, Grant and 25 more6 hr
Jun 20, 10:42 AM CDTMesoscale DiscussionSPCAllen, Anderson, Butler, Chase, Chautauqua, Coffey and 18 more63 min
Jun 20, 1:00 PM CDTTornado Watch PDSSPCDecatur, Gove, Graham, Jewell, Mitchell, Norton and 5 more10 hr
Jun 20, 1:34 PM CDTMesoscale DiscussionSPCButler, Chase, Clay, Cowley, Dickinson, Ellsworth and 15 more116 min
Jun 20, 2:19 PM CDTMesoscale DiscussionSPCNorton, Phillips, Smith86 min
Jun 20, 2:52 PM CDTMesoscale DiscussionSPCDecatur, Rawlins, Thomas53 min
Jun 20, 3:08 PM CDTTornado WatchSPCAtchison, Brown, Butler, Chase, Chautauqua, Clay and 34 more7 hr
Jun 20, 3:59 PM CDTMesoscale DiscussionSPCJewell61 min
Jun 20, 6:17 PM CDTMesoscale DiscussionSPCBrown, Butler, Chase, Chautauqua, Clay, Coffey and 28 more58 min
Jun 19, 8:24 PM CDTMesoscale DiscussionSPCAdams, Blaine, Boone, Buffalo, Chase, Clay and 35 more96 min
Jun 19, 9:16 PM CDTMesoscale DiscussionSPCBurt, Cass, Dodge, Douglas, Lancaster, Nemaha and 4 more59 min
Jun 19, 9:49 PM CDTTornado WatchSPCAdams, Antelope, Boone, Buffalo, Burt, Butler and 46 more6 hr
Jun 20, 12:45 AM CDTSevere Thunderstorm WatchSPCChase, Dundy, Frontier, Hayes, Hitchcock, Red Willow2 hr
Jun 20, 3:27 AM CDTMesoscale DiscussionSPCBurt, Butler, Cass, Colfax, Cuming, Dodge and 11 more33 min
Jun 20, 3:46 AM CDTSevere Thunderstorm WatchSPCBurt, Butler, Cass, Colfax, Cuming, Dodge and 10 more5 hr
Jun 20, 6:53 PM CDTTornado WatchSPCAntelope, Boone, Boyd, Burt, Butler, Cass and 29 more6 hr

Nearby

Mesoscale Discussions in Nebraska, 2011Mesoscale Discussions in Kansas, 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.