Alert archive / Nebraska / Mesoscale Discussions in 2015

Mesoscale Discussion 363

April 18, 20156 counties in Colorado; 9 counties in Kansas; 16 counties in Nebraska

The Storm Prediction Center issued this mesoscale discussion at Apr 18, 2015, 5:07 PM MDT for 6 counties in Colorado; 9 counties in Kansas; 16 counties in Nebraska. It was in force for 53 min.

The area

The outline as issued.

The facts

Issued
Apr 18, 2015, 5:07 PM MDT (23:07 UTC)
Expired
Apr 18, 2015, 6:00 PM MDT
In force
53 min
Issued by
the Storm Prediction Center
All 31 counties

Cheyenne County, CO, Kit Carson County, CO, Logan County, CO, Phillips County, CO, Sedgwick County, CO, Yuma County, CO, Cheyenne County, KS, Decatur County, KS, Gove County, KS, Logan County, KS, Rawlins County, KS, Sheridan County, KS, Sherman County, KS, Thomas County, KS, Wallace County, KS, Arthur County, NE, Chase County, NE, Cheyenne County, NE, Deuel County, NE, Dundy County, NE, Frontier County, NE, Garden County, NE, Hayes County, NE, Hitchcock County, NE, Keith County, NE, Lincoln County, NE, Logan County, NE, McPherson County, NE, Morrill County, NE, Perkins County, NE, Red Willow County, NE

The radar

The Goodland radar (KGLD), 60 km from the middle of the area, began a volume at 23:08 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, 11.1 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-pSkew-T log-p diagram, Denver, CO at 12:00Z on 2015-04-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 33 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Denver, CO at 12:00Z on 2015-04-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 44 square meters per square second.1939Sfc1 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
33 J/kg
Mixed-layer CIN
-26 J/kg
Mixed-layer LCL
692 m above ground
0-6 km bulk shear
15 kt
0-1 km storm-relative helicity
44 m²/s²
0-3 km storm-relative helicity
75 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.

IssuedProductOfficeCountiesLasted
Apr 17, 6:06 PM MDTMesoscale DiscussionSPCCheyenne, Kit Carson, Logan, Morgan, Phillips, Sedgwick and 2 more84 min
Apr 17, 7:56 PM MDTMesoscale DiscussionSPCCheyenne, Kit Carson, Logan, Phillips, Sedgwick, Washington and 1 more94 min
Apr 18, 2:08 PM MDTTornado WatchSPCCheyenne, Kit Carson, Logan, Phillips, Sedgwick, Washington and 1 more6 hr
Apr 17, 6:26 PM MDTMesoscale DiscussionSPCGrant, Morton, Stevens2 hr
Apr 17, 7:24 PM MDTMesoscale DiscussionSPCEllsworth, Lincoln, Mitchell, Osborne, Phillips, Russell and 1 more2 hr
Apr 18, 11:45 AM MDTMesoscale DiscussionSPCBarber, Harper, Kingman, Pratt60 min
Apr 18, 12:52 PM MDTMesoscale DiscussionSPCBarber, Clark, Comanche, Edwards, Ford, Kiowa and 1 more113 min
Apr 18, 1:43 PM MDTSevere Thunderstorm WatchSPCBarber, Barton, Butler, Clark, Comanche, Cowley and 27 more8 hr
Apr 18, 1:49 PM MDTMesoscale DiscussionSPCCheyenne, Decatur, Graham, Norton, Phillips, Rawlins and 3 more116 min
Apr 18, 3:07 PM MDTMesoscale DiscussionSPCButler, Chase, Chautauqua, Clay, Cowley, Dickinson and 9 more2 hr
Apr 18, 4:31 PM MDTMesoscale DiscussionSPCBarber, Barton, Clark, Comanche, Edwards, Ellis and 24 more59 min
Apr 17, 10:48 PM MDTMesoscale DiscussionSPCFrontier, Hayes, Lincoln57 min

Nearby

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