Alert archive / Nebraska / Mesoscale Discussions in 2013

Mesoscale Discussion 819

May 27, 20138 counties in Colorado; 10 counties in Kansas; 33 counties in Nebraska

The Storm Prediction Center issued this mesoscale discussion at May 27, 2013, 1:00 PM MDT for 8 counties in Colorado; 10 counties in Kansas; 33 counties in Nebraska. It was in force for 60 min.

The area

The outline as issued.

The facts

Issued
May 27, 2013, 1:00 PM MDT (19:00 UTC)
Expired
May 27, 2013, 2:00 PM MDT
In force
60 min
Issued by
the Storm Prediction Center
Chance of a watch
80%
All 51 counties

Cheyenne County, CO, Kit Carson County, CO, Logan County, CO, Morgan County, CO, Phillips County, CO, Sedgwick County, CO, Washington County, CO, Yuma County, CO, Cheyenne County, KS, Decatur County, KS, Gove County, KS, Logan County, KS, Norton County, KS, Rawlins County, KS, Sheridan County, KS, Sherman County, KS, Thomas County, KS, Wallace County, KS, Arthur County, NE, Banner County, NE, Blaine County, NE, Box Butte County, NE, Brown County, NE, Chase County, NE, Cherry County, NE, Cheyenne County, NE, Custer County, NE, Dawes County, NE, Dawson County, NE, Deuel County, NE, Dundy County, NE, Frontier County, NE, Furnas County, NE, Garden County, NE, Gosper County, NE, Grant County, NE, Hayes County, NE, Hitchcock County, NE, Hooker County, NE, Keith County, NE, Kimball County, NE, Lincoln County, NE, Logan County, NE, McPherson County, NE, Morrill County, NE, Perkins County, NE, Red Willow County, NE, Scotts Bluff County, NE, Sheridan County, NE, Sioux County, NE, Thomas County, NE

The radar

The North Platte radar (KLNX), 160 km from the middle of the area, began a volume at 19:00 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 12:00Z, 7.0 hours before the alert went out and 114 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 2013-05-27Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1876 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 2013-05-27The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -30 square meters per square second.193958Sfc1 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
1876 J/kg
Mixed-layer CIN
-186 J/kg
Mixed-layer LCL
537 m above ground
0-6 km bulk shear
43 kt
0-1 km storm-relative helicity
-30 m²/s²
0-3 km storm-relative helicity
-25 m²/s²
Significant tornado parameter
-0.0
Supercell composite
-0.2

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
May 27, 1:19 PM MDTSevere Thunderstorm WatchSPCCheyenne, Kit Carson, Logan, Phillips, Sedgwick, Washington and 1 more6 hr
May 27, 4:41 PM MDTMesoscale DiscussionSPCCheyenne, Kit Carson, Logan, Phillips, Sedgwick, Yuma94 min
May 27, 12:40 AM MDTMesoscale DiscussionSPCBrown, Doniphan95 min
May 27, 2:33 AM MDTSevere Thunderstorm WatchSPCAtchison, Brown, Doniphan, Jackson, Nemaha5 hr
May 27, 5:20 AM MDTMesoscale DiscussionSPCAtchison, Brown, Doniphan, Jackson, Nemaha85 min
May 27, 2:23 PM MDTMesoscale DiscussionSPCCloud, Decatur, Ellis, Graham, Jewell, Lincoln and 9 more67 min
May 27, 3:49 PM MDTTornado WatchSPCClay, Cloud, Decatur, Dickinson, Ellis, Ellsworth and 20 more7 hr
May 27, 4:36 PM MDTMesoscale DiscussionSPCBarber, Barton, Butler, Chase, Comanche, Cowley and 19 more84 min
May 27, 5:53 PM MDTMesoscale DiscussionSPCClay, Cloud, Decatur, Dickinson, Ellis, Geary and 17 more2 hr
May 26, 6:33 PM MDTTornado WatchSPCAntelope, Blaine, Boone, Brown, Buffalo, Custer and 18 more4 hr
May 26, 8:07 PM MDTMesoscale DiscussionSPCAntelope, Blaine, Boone, Brown, Butler, Cedar and 24 more83 min
May 26, 10:03 PM MDTSevere Thunderstorm WatchSPCAntelope, Blaine, Boone, Burt, Butler, Cass and 37 more6 hr

Nearby

Mesoscale Discussions in Nebraska, 2013Mesoscale Discussions in Kansas, 2013Mesoscale Discussions in Colorado, 2013Every mesoscale discussion in 2013

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.