Alert archive / Nebraska / Mesoscale Discussions in 2018

Mesoscale Discussion 955

June 30, 201835 counties in Nebraska

The Storm Prediction Center issued this mesoscale discussion at Jun 30, 2018, 3:11 PM CDT for 35 counties in Nebraska. It was in force for 94 min.

The area

The outline as issued.

The facts

Issued: Jun 30, 2018, 3:11 PM CDT (20:11 UTC)
Expired: Jun 30, 2018, 4:45 PM CDT
In force: 94 min
Issued by: the Storm Prediction Center
Chance of a watch: 80%

All 35 counties

Adams County, NE, Boone County, NE, Buffalo County, NE, Chase County, NE, Clay County, NE, Custer County, NE, Dawson County, NE, Franklin County, NE, Frontier County, NE, Furnas County, NE, Garfield County, NE, Gosper County, NE, Greeley County, NE, Hall County, NE, Hamilton County, NE, Harlan County, NE, Hayes County, NE, Hitchcock County, NE, Howard County, NE, Kearney County, NE, Keith County, NE, Lincoln County, NE, Logan County, NE, Loup County, NE, McPherson County, NE, Merrick County, NE, Nance County, NE, Nuckolls County, NE, Perkins County, NE, Phelps County, NE, Red Willow County, NE, Sherman County, NE, Valley County, NE, Webster County, NE, Wheeler County, NE

The radar

The North Platte radar (KLNX), 117 km from the middle of the area, began a volume at 20:14 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, 8.2 hours before the alert went out and 66 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 118 J/kg
Mixed-layer CIN: -153 J/kg
Mixed-layer LCL: 1020 m above ground
0-6 km bulk shear: 40 kt
0-1 km storm-relative helicity: 207 m²/s²
0-3 km storm-relative helicity: 621 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.0

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.

Issued	Product	Office	Counties	Lasted
Jun 29, 9:37 PM CDT	Mesoscale Discussion	SPC	Franklin, Furnas, Gosper, Harlan, Kearney, Phelps and 2 more	113 min
Jun 30, 1:35 AM CDT	Mesoscale Discussion	SPC	Antelope, Arthur, Banner, Blaine, Brown, Garden and 12 more	85 min
Jun 30, 12:40 PM CDT	Mesoscale Discussion	SPC	Boone, Burt, Butler, Clay, Colfax, Cuming and 19 more	3 hr
Jun 30, 1:39 PM CDT	Severe Thunderstorm Watch	SPC	Burt, Butler, Cass, Dodge, Douglas, Gage and 12 more	7 hr
Jun 30, 2:03 PM CDT	Mesoscale Discussion	SPC	Arthur, Banner, Box Butte, Cheyenne, Dawes, Deuel and 7 more	87 min
Jun 30, 3:03 PM CDT	Severe Thunderstorm Watch	SPC	Banner, Box Butte, Cheyenne, Dawes, Kimball, Morrill and 2 more	7 hr
Jun 30, 3:26 PM CDT	Severe Thunderstorm Watch	SPC	Adams, Arthur, Blaine, Buffalo, Chase, Cherry and 39 more	8 hr
Jun 30, 3:40 PM CDT	Mesoscale Discussion	SPC	Cass, Dodge, Douglas, Lancaster, Otoe, Sarpy and 3 more	2 hr
Jun 30, 4:40 PM CDT	Mesoscale Discussion	SPC	Nemaha, Pawnee, Richardson	95 min
Jun 30, 5:40 PM CDT	Mesoscale Discussion	SPC	Banner, Box Butte, Cheyenne, Deuel, Kimball, Morrill and 1 more	2 hr
Jun 30, 6:09 PM CDT	Mesoscale Discussion	SPC	Adams, Arthur, Blaine, Buffalo, Butler, Cass and 46 more	96 min
Jun 30, 6:09 PM CDT	Severe Thunderstorm Watch	SPC	Dundy, Hitchcock, Red Willow	7 hr

Nearby

Mesoscale Discussions in Nebraska, 2018 Every mesoscale discussion in 2018

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.