Alert archive / Nebraska / Mesoscale Discussions in 2013

Mesoscale Discussion 797

May 25, 20134 states

The Storm Prediction Center issued this mesoscale discussion at May 25, 2013, 2:27 PM MDT for 4 states. It was in force for 93 min.

The area

The outline as issued.

The facts

Issued
May 25, 2013, 2:27 PM MDT (20:27 UTC)
Expired
May 25, 2013, 4:00 PM MDT
In force
93 min
Issued by
the Storm Prediction Center
Chance of a watch
60%
All 43 counties

Cheyenne County, CO, Kit Carson County, CO, Logan County, CO, Morgan County, CO, Phillips County, CO, Sedgwick County, CO, Washington County, CO, Weld County, CO, Yuma County, CO, Cheyenne County, KS, Logan County, KS, Rawlins County, KS, Sherman County, KS, Thomas County, KS, Wallace County, KS, Arthur County, NE, Banner County, NE, Box Butte County, NE, Chase County, NE, Cheyenne County, NE, Dawes County, NE, Deuel County, NE, Dundy County, NE, Frontier County, NE, Garden 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, Goshen County, WY, Laramie County, WY, Platte County, WY

The radar

The North Platte radar (KLNX), 181 km from the middle of the area, began a volume at 20:26 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

Denver, CO (KDNR), launched 12:00Z, 8.5 hours before the alert went out and 163 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 2013-05-25Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1683 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 2013-05-25The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 58 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
1683 J/kg
Mixed-layer CIN
-139 J/kg
Mixed-layer LCL
1090 m above ground
0-6 km bulk shear
32 kt
0-1 km storm-relative helicity
58 m²/s²
0-3 km storm-relative helicity
191 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
May 24, 6:54 PM MDTMesoscale DiscussionSPCLogan, Phillips, Sedgwick, Yuma81 min
May 25, 1:57 PM MDTMesoscale DiscussionSPCBaca, Bent, Las Animas, Otero, Prowers2 hr
May 25, 4:11 PM MDTSevere Thunderstorm WatchSPCCheyenne, Decatur, Finney, Gove, Graham, Grant and 20 more6 hr
May 24, 10:50 PM MDTMesoscale DiscussionSPCAdams, Boone, Buffalo, Clay, Custer, Dawson and 22 more55 min
May 24, 11:04 PM MDTSevere Thunderstorm WatchSPCAdams, Boone, Buffalo, Butler, Clay, Dawson and 20 more4 hr
May 25, 5:50 PM MDTMesoscale DiscussionSPCAdams, Buffalo, Dawson, Franklin, Frontier, Gosper and 8 more85 min
May 25, 11:43 AM MDTMesoscale DiscussionSPCCrook, Weston92 min
May 25, 1:52 PM MDTTornado WatchSPCCampbell, Crook, Weston8 hr

Nearby

Mesoscale Discussions in Nebraska, 2013Mesoscale Discussions in Colorado, 2013Mesoscale Discussions in Kansas, 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.