Alert archive / Nebraska / Mesoscale Discussions in 2006

Mesoscale Discussion 1801

August 11, 200614 counties in Nebraska

The Storm Prediction Center issued this mesoscale discussion at Aug 11, 2006, 10:01 PM CDT for 14 counties in Nebraska. It was in force for 89 min.

The area

The outline as issued.

The facts

Issued: Aug 11, 2006, 10:01 PM CDT (03:01 UTC)
Expired: Aug 11, 2006, 11:30 PM CDT
In force: 89 min
Issued by: the Storm Prediction Center

Counties Antelope County, NE, Boone County, NE, Cedar County, NE, Colfax County, NE, Cuming County, NE, Dixon County, NE, Knox County, NE, Madison County, NE, Nance County, NE, Pierce County, NE, Platte County, NE, Stanton County, NE, Wayne County, NE, Wheeler County, NE

The radar

The Omaha radar (KOAX), 132 km from the middle of the area, began a volume at 03:02 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, 3.0 hours before the alert went out and 267 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: 2404 J/kg
Mixed-layer CIN: -65 J/kg
Mixed-layer LCL: 1855 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 85 m²/s²
0-3 km storm-relative helicity: 131 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 6.9

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
Aug 11, 7:25 PM CDT	Severe Thunderstorm Watch	SPC	Boyd, Brown, Holt, Keya Paha, Rock	4 hr
Aug 11, 7:58 PM CDT	Mesoscale Discussion	SPC	Brown, Cherry, Keya Paha, Rock, Sheridan	92 min
Aug 12, 1:27 PM CDT	Mesoscale Discussion	SPC	Arthur, Blaine, Brown, Cherry, Deuel, Garden and 10 more	93 min
Aug 12, 1:45 PM CDT	Severe Thunderstorm Watch	SPC	Arthur, Blaine, Boyd, Brown, Cherry, Custer and 13 more	7 hr

Nearby

Mesoscale Discussions in Nebraska, 2006 Every mesoscale discussion in 2006

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.