Alert archive / Nebraska / Mesoscale Discussions in 2014

Mesoscale Discussion 1179

June 27, 201441 counties in Nebraska; 15 counties in South Dakota

The Storm Prediction Center issued this mesoscale discussion at Jun 27, 2014, 7:41 PM CDT for 41 counties in Nebraska; 15 counties in South Dakota. It was in force for 94 min.

The area

The outline as issued.

The facts

Issued: Jun 27, 2014, 7:41 PM CDT (00:41 UTC)
Expired: Jun 27, 2014, 9:15 PM CDT
In force: 94 min
Issued by: the Storm Prediction Center

All 56 counties

Adams County, NE, Antelope County, NE, Arthur County, NE, Blaine County, NE, Boone County, NE, Boyd County, NE, Brown County, NE, Buffalo County, NE, Cherry County, NE, Clay County, NE, Custer County, NE, Franklin County, NE, Garden County, NE, Garfield County, NE, Grant County, NE, Greeley County, NE, Hall County, NE, Hamilton County, NE, Harlan County, NE, Holt County, NE, Hooker County, NE, Howard County, NE, Kearney County, NE, Keya Paha County, NE, Knox County, NE, Logan County, NE, Loup County, NE, Madison County, NE, McPherson County, NE, Merrick County, NE, Nance County, NE, Phelps County, NE, Pierce County, NE, Polk County, NE, Rock County, NE, Sheridan County, NE, Sherman County, NE, Thomas County, NE, Valley County, NE, Webster County, NE, Wheeler County, NE, Bennett County, SD, Butte County, SD, Custer County, SD, Fall River County, SD, Haakon County, SD, Harding County, SD, Jackson County, SD, Lawrence County, SD, Meade County, SD, Mellette County, SD, Oglala Lakota County, SD, Pennington County, SD, Perkins County, SD, Todd County, SD, Ziebach County, SD

The radar

The North Platte radar (KLNX), 87 km from the middle of the area, began a volume at 00:43 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.

Severe Thunderstorm Watch 364Jun 27, 7:45 PM CDT

The nearest sounding before it

N. Platte/Lee Bi, NE (KLBF), launched 00:00Z, 0.7 hours before the alert went out and 179 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: 2656 J/kg
Mixed-layer CIN: -16 J/kg
Mixed-layer LCL: 969 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: 81 m²/s²
0-3 km storm-relative helicity: 143 m²/s²
Significant tornado parameter: 1.0
Supercell composite: 7.1

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.

Issued	Product	Office	Counties	Lasted
Jun 27, 7:42 PM CDT	Severe Thunderstorm Watch	SPC	Antelope, Blaine, Boone, Boyd, Brown, Buffalo and 16 more	4 hr
Jun 27, 9:30 PM CDT	Mesoscale Discussion	SPC	Furnas, Red Willow	60 min
Jun 27, 10:22 PM CDT	Mesoscale Discussion	SPC	Antelope, Blaine, Boone, Boyd, Brown, Buffalo and 19 more	53 min
Jun 28, 11:26 AM CDT	Mesoscale Discussion	SPC	Richardson	94 min
Jun 28, 5:15 PM CDT	Mesoscale Discussion	SPC	Antelope, Boone, Burt, Butler, Cedar, Colfax and 26 more	90 min

Nearby

Mesoscale Discussions in Nebraska, 2014 Mesoscale Discussions in South Dakota, 2014 Every mesoscale discussion in 2014

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.