Alert archive / Nebraska / Mesoscale Discussions in 2008

Mesoscale Discussion 1786

July 15, 200814 counties in Nebraska; Bennett County, South Dakota

The Storm Prediction Center issued this mesoscale discussion at Jul 15, 2008, 2:53 PM MDT for 14 counties in Nebraska; Bennett County, South Dakota. It was in force for 97 min.

The area

The outline as issued.

The facts

Issued: Jul 15, 2008, 2:53 PM MDT (20:53 UTC)
Expired: Jul 15, 2008, 4:30 PM MDT
In force: 97 min
Issued by: the Storm Prediction Center

Counties Arthur County, NE, Blaine County, NE, Cherry County, NE, Garden County, NE, Grant County, NE, Hayes County, NE, Hooker County, NE, Keith County, NE, Lincoln County, NE, Logan County, NE, McPherson County, NE, Perkins County, NE, Sheridan County, NE, Thomas County, NE, Bennett County, SD

The radar

The North Platte radar (KLNX), 64 km from the middle of the area, began a volume at 20:53 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 692Jul 15, 3:30 PM MDT

The nearest sounding before it

N. Platte/Lee Bi, NE (KLBF), launched 12:00Z, 8.9 hours before the alert went out and 99 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: 1303 J/kg
Mixed-layer CIN: -324 J/kg
Mixed-layer LCL: 955 m above ground
0-6 km bulk shear: 40 kt
0-1 km storm-relative helicity: 254 m²/s²
0-3 km storm-relative helicity: 277 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 3.6

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 14, 6:03 PM MDT	Mesoscale Discussion	SPC	Buffalo, Chase, Custer, Dawson, Dundy, Franklin and 15 more	57 min
Jul 15, 1:37 PM MDT	Mesoscale Discussion	SPC	Antelope, Blaine, Boone, Boyd, Brown, Cedar and 10 more	83 min
Jul 15, 3:30 PM MDT	Severe Thunderstorm Watch	SPC	Adams, Antelope, Arthur, Blaine, Boone, Brown and 55 more	8 hr

Nearby

Mesoscale Discussions in Nebraska, 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.