Alert archive / Nebraska / Mesoscale Discussions in 2011

Mesoscale Discussion 1587

July 11, 201136 counties in Nebraska

The Storm Prediction Center issued this mesoscale discussion at Jul 11, 2011, 9:40 PM CDT for 36 counties in Nebraska. It was in force for 65 min.

The area

The outline as issued.

The facts

Issued: Jul 11, 2011, 9:40 PM CDT (02:40 UTC)
Expired: Jul 11, 2011, 10:45 PM CDT
In force: 65 min
Issued by: the Storm Prediction Center

All 36 counties

Antelope County, NE, Arthur County, NE, Blaine County, NE, Boone County, NE, Brown County, NE, Buffalo County, NE, Butler County, NE, Cherry County, NE, Colfax County, NE, Cuming County, NE, Custer County, NE, Dodge County, NE, Garfield County, NE, Greeley County, NE, Hall County, NE, Hamilton County, NE, Holt County, NE, Hooker County, NE, Howard County, NE, Logan County, NE, Loup County, NE, Madison County, NE, McPherson County, NE, Merrick County, NE, Nance County, NE, Pierce County, NE, Platte County, NE, Polk County, NE, Rock County, NE, Sherman County, NE, Stanton County, NE, Thomas County, NE, Valley County, NE, Wayne County, NE, Wheeler County, NE, York County, NE

The radar

The North Platte radar (KLNX), 107 km from the middle of the area, began a volume at 02:40 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, 2.7 hours before the alert went out and 139 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: 2166 J/kg
Mixed-layer CIN: -103 J/kg
Mixed-layer LCL: 1348 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 74 m²/s²
0-3 km storm-relative helicity: 170 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 3.2

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
Jul 11, 7:54 PM CDT	Mesoscale Discussion	SPC	Cherry, Sheridan	66 min
Jul 12, 2:09 AM CDT	Mesoscale Discussion	SPC	Antelope, Boone, Burt, Butler, Cedar, Colfax and 25 more	66 min

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.