Alert archive / Nebraska / Mesoscale Discussions in 2017

Mesoscale Discussion 738

May 16, 20175 counties in Colorado; 6 counties in Kansas; 27 counties in Nebraska

The Storm Prediction Center issued this mesoscale discussion at May 16, 2017, 4:47 PM MDT for 5 counties in Colorado; 6 counties in Kansas; 27 counties in Nebraska. It was in force for 88 min.

The area

The outline as issued.

The facts

Issued
May 16, 2017, 4:47 PM MDT (22:47 UTC)
Expired
May 16, 2017, 6:15 PM MDT
In force
88 min
Issued by
the Storm Prediction Center
Chance of a watch
60%
All 38 counties

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

The radar

The North Platte radar (KLNX), 131 km from the middle of the area, began a volume at 22:51 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, 10.8 hours before the alert went out and 99 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 2017-05-16Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 89 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 2017-05-16The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 204 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
89 J/kg
Mixed-layer CIN
-399 J/kg
Mixed-layer LCL
991 m above ground
0-6 km bulk shear
56 kt
0-1 km storm-relative helicity
204 m²/s²
0-3 km storm-relative helicity
254 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

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SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 16, 1:16 PM MDTMesoscale DiscussionSPCAdams, Arapahoe, Bent, Cheyenne, Crowley, Elbert and 8 more119 min
May 16, 1:03 PM MDTMesoscale DiscussionSPCBarton, Clark, Edwards, Ellis, Ellsworth, Ford and 16 more27 min
May 16, 1:16 PM MDTTornado WatchSPCBarber, Barton, Clark, Comanche, Edwards, Ellis and 20 more8 hr
May 16, 2:58 PM MDTMesoscale DiscussionSPCCloud, Graham, Jewell, Marshall, Mitchell, Norton and 7 more2 hr
May 16, 3:57 PM MDTSevere Thunderstorm WatchSPCAtchison, Brown, Clay, Cloud, Dickinson, Doniphan and 23 more7 hr
May 15, 6:34 PM MDTMesoscale DiscussionSPCBanner, Box Butte, Dawes, Morrill, Scotts Bluff, Sheridan and 1 more56 min
May 15, 6:41 PM MDTMesoscale DiscussionSPCBurt, Butler, Colfax, Cuming, Dodge, Madison and 9 more3 hr
May 15, 9:53 PM MDTMesoscale DiscussionSPCBanner, Box Butte, Dawes, Morrill, Scotts Bluff, Sheridan and 1 more67 min
May 15, 10:54 PM MDTSevere Thunderstorm WatchSPCDakota, Dixon3 hr

Nearby

Mesoscale Discussions in Nebraska, 2017Mesoscale Discussions in Kansas, 2017Mesoscale Discussions in Colorado, 2017Every mesoscale discussion in 2017

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.