Alert archive / Nebraska / Mesoscale Discussions in 2008

Mesoscale Discussion 796

May 6, 2008Logan County, Phillips County, Sedgwick County, Colorado; 27 counties in Nebraska; Bennett County, South Dakota

The Storm Prediction Center issued this mesoscale discussion at May 6, 2008, 12:58 PM MDT for Logan County, Phillips County, Sedgwick County, Colorado; 27 counties in Nebraska; Bennett County, South Dakota. It was in force for 92 min.

The area

The outline as issued.

The facts

Issued: May 6, 2008, 12:58 PM MDT (18:58 UTC)
Expired: May 6, 2008, 2:30 PM MDT
In force: 92 min
Issued by: the Storm Prediction Center

All 31 counties

Logan County, CO, Phillips County, CO, Sedgwick County, CO, Arthur County, NE, Blaine County, NE, Boone County, NE, Brown County, NE, Chase County, NE, Cherry County, NE, Cheyenne County, NE, Custer County, NE, Dawson County, NE, Deuel County, NE, Garden County, NE, Garfield County, NE, Grant County, NE, Greeley County, NE, Hayes County, NE, Hooker County, NE, Keith County, NE, Lincoln County, NE, Logan County, NE, Loup County, NE, McPherson County, NE, Perkins County, NE, Rock County, NE, Sherman County, NE, Thomas County, NE, Valley County, NE, Wheeler County, NE, Bennett County, SD

The radar

The North Platte radar (KLNX), 80 km from the middle of the area, began a volume at 19:01 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 266May 6, 1:50 PM MDT

The nearest sounding before it

N. Platte/Lee Bi, NE (KLBF), launched 12:00Z, 7.0 hours before the alert went out and 100 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: 468 J/kg
Mixed-layer CIN: -331 J/kg
Mixed-layer LCL: 1005 m above ground
0-6 km bulk shear: 40 kt
0-1 km storm-relative helicity: 23 m²/s²
0-3 km storm-relative helicity: 141 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.1

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
May 6, 9:56 AM MDT	Mesoscale Discussion	SPC	Boyd, Cedar, Dakota, Dixon, Holt, Keya Paha and 4 more	94 min
May 6, 11:03 AM MDT	Severe Thunderstorm Watch	SPC	Antelope, Boyd, Brown, Cedar, Dakota, Dixon and 7 more	7 hr
May 6, 1:22 PM MDT	Mesoscale Discussion	SPC	Cedar, Dakota, Dixon	113 min
May 6, 1:50 PM MDT	Severe Thunderstorm Watch	SPC	Arthur, Blaine, Boone, Buffalo, Burt, Butler and 41 more	7 hr
May 6, 2:46 PM MDT	Severe Thunderstorm Watch	SPC	Dundy, Hitchcock, Red Willow	6 hr
May 6, 5:23 PM MDT	Mesoscale Discussion	SPC	Adams, Antelope, Boone, Buffalo, Burt, Butler and 47 more	2 hr

Nearby

Mesoscale Discussions in Nebraska, 2008 Mesoscale Discussions in Colorado, 2008 Mesoscale Discussions in South Dakota, 2008 Every mesoscale discussion in 2008

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.