Alert archive / Nebraska / Mesoscale Discussions in 2016

Mesoscale Discussion 1178

July 6, 2016Norton County, Kansas; 35 counties in Nebraska

The Storm Prediction Center issued this mesoscale discussion at Jul 6, 2016, 9:28 PM CDT for Norton County, Kansas; 35 counties in Nebraska. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
Jul 6, 2016, 9:28 PM CDT (02:28 UTC)
Expired
Jul 6, 2016, 11:30 PM CDT
In force
2 hr
Issued by
the Storm Prediction Center
Chance of a watch
95%
All 36 counties

Norton County, KS, Adams County, NE, Boone County, NE, Buffalo County, NE, Butler County, NE, Clay County, NE, Colfax County, NE, Custer County, NE, Dawson County, NE, Fillmore 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, Jefferson County, NE, Kearney County, NE, Lancaster County, NE, Merrick County, NE, Nance County, NE, Nuckolls County, NE, Phelps County, NE, Platte County, NE, Polk County, NE, Red Willow County, NE, Saline County, NE, Seward County, NE, Sherman County, NE, Thayer County, NE, Valley County, NE, Webster County, NE, York County, NE

The radar

The Grand Island radar (KUEX), 71 km from the middle of the area, began a volume at 02:28 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 00:00Z, 2.5 hours before the alert went out and 178 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 00:00Z on 2016-07-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2862 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 00:00Z on 2016-07-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 189 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
2862 J/kg
Mixed-layer CIN
-103 J/kg
Mixed-layer LCL
1697 m above ground
0-6 km bulk shear
40 kt
0-1 km storm-relative helicity
189 m²/s²
0-3 km storm-relative helicity
298 m²/s²
Significant tornado parameter
0.9
Supercell composite
28.9

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
Jul 6, 9:47 PM CDTSevere Thunderstorm WatchSPCJewell, Mitchell, Osborne, Phillips, Rooks, Smith5 hr
Jul 7, 1:22 AM CDTMesoscale DiscussionSPCAtchison, Brown, Clay, Cloud, Doniphan, Jackson and 11 more83 min
Jul 7, 1:37 AM CDTSevere Thunderstorm WatchSPCAtchison, Brown, Clay, Cloud, Doniphan, Douglas and 15 more6 hr
Jul 7, 2:31 AM CDTMesoscale DiscussionSPCJewell, Mitchell, Norton, Phillips, Republic, Smith89 min
Jul 7, 4:27 AM CDTMesoscale DiscussionSPCAtchison, Brown, Doniphan, Douglas, Franklin, Jackson and 13 more93 min
Jul 7, 5:26 AM CDTMesoscale DiscussionSPCFranklin, Johnson, Linn, Miami, Osage2 hr
Jul 7, 2:40 PM CDTMesoscale DiscussionSPCCheyenne, Decatur, Norton, Rawlins2 hr
Jul 7, 5:14 PM CDTMesoscale DiscussionSPCCheyenne, Decatur, Graham, Norton, Phillips, Rawlins and 1 more3 hr
Jul 6, 7:38 PM CDTSevere Thunderstorm WatchSPCAntelope, Boone, Burt, Cedar, Colfax, Cuming and 11 more6 hr
Jul 7, 1:50 PM CDTMesoscale DiscussionSPCBurt, Colfax, Cuming, Dodge, Douglas, Sarpy and 3 more115 min
Jul 7, 3:54 PM CDTSevere Thunderstorm WatchSPCBurt, Butler, Cass, Colfax, Cuming, Dakota and 11 more5 hr
Jul 7, 6:30 PM CDTMesoscale DiscussionSPCCass, Otoe, Sarpy2 hr

Nearby

Mesoscale Discussions in Nebraska, 2016Mesoscale Discussions in Kansas, 2016Every mesoscale discussion in 2016

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.