Alert archive / Nebraska / Mesoscale Discussions in 2011

Mesoscale Discussion 1412

June 26, 201113 counties in Nebraska

The Storm Prediction Center issued this mesoscale discussion at Jun 26, 2011, 11:33 PM CDT for 13 counties in Nebraska. It was in force for 57 min.

The area

The outline as issued.

The facts

Issued: Jun 26, 2011, 11:33 PM CDT (04:33 UTC)
Expired: Jun 27, 2011, 12:30 AM CDT
In force: 57 min
Issued by: the Storm Prediction Center

Counties Boone County, NE, Buffalo County, NE, Garfield County, NE, Greeley County, NE, Hall County, NE, Hamilton County, NE, Howard County, NE, Merrick County, NE, Nance County, NE, Polk County, NE, Sherman County, NE, Valley County, NE, Wheeler County, NE

The radar

The Grand Island radar (KUEX), 117 km from the middle of the area, began a volume at 04:35 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 nearest sounding before it

N. Platte/Lee Bi, NE (KLBF), launched 00:00Z, 4.6 hours before the alert went out and 157 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: 2662 J/kg
Mixed-layer CIN: -63 J/kg
Mixed-layer LCL: 690 m above ground
0-6 km bulk shear: 59 kt
0-1 km storm-relative helicity: 114 m²/s²
0-3 km storm-relative helicity: 100 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 0.7

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 26, 7:25 PM CDT	Mesoscale Discussion	SPC	Arthur, Blaine, Box Butte, Cherry, Garden, Grant and 7 more	65 min
Jun 26, 7:56 PM CDT	Severe Thunderstorm Watch	SPC	Arthur, Blaine, Cherry, Custer, Deuel, Garden and 9 more	7 hr
Jun 26, 8:02 PM CDT	Tornado Watch	SPC	Cass, Gage, Jefferson, Johnson, Lancaster, Nemaha and 4 more	3 hr

Nearby

Mesoscale Discussions in Nebraska, 2011 Every mesoscale discussion in 2011

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.