Alert archive / Nebraska / Mesoscale Discussions in 2005

Mesoscale Discussion 896

May 17, 200535 counties in Nebraska; Bennett County, Todd County, Tripp County, South Dakota

The Storm Prediction Center issued this mesoscale discussion at May 17, 2005, 1:29 PM CDT for 35 counties in Nebraska; Bennett County, Todd County, Tripp County, South Dakota. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: May 17, 2005, 1:29 PM CDT (18:29 UTC)
Expired: May 17, 2005, 3:30 PM CDT
In force: 2 hr
Issued by: the Storm Prediction Center

All 38 counties

Adams County, NE, Arthur County, NE, Blaine County, NE, Brown County, NE, Buffalo County, NE, Chase County, NE, Cherry County, NE, Custer County, NE, Dawson County, NE, Dundy County, NE, Franklin County, NE, Frontier County, NE, Furnas County, NE, Garfield County, NE, Gosper County, NE, Grant County, NE, Harlan County, NE, Hayes County, NE, Hitchcock County, NE, Hooker County, NE, Kearney County, NE, Keith County, NE, Keya Paha County, NE, Lincoln County, NE, Logan County, NE, Loup County, NE, McPherson County, NE, Perkins County, NE, Phelps County, NE, Red Willow County, NE, Rock County, NE, Sherman County, NE, Thomas County, NE, Valley County, NE, Webster County, NE, Bennett County, SD, Todd County, SD, Tripp County, SD

The radar

The North Platte radar (KLNX), 32 km from the middle of the area, began a volume at 18:29 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 283May 17, 1:50 PM CDT

The nearest sounding before it

N. Platte/Lee Bi, NE (KLBF), launched 12:00Z, 6.5 hours before the alert went out and 107 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: 64 J/kg
Mixed-layer CIN: -650 J/kg
Mixed-layer LCL: 1316 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: 82 m²/s²
0-3 km storm-relative helicity: 94 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 17, 1:50 PM CDT	Severe Thunderstorm Watch	SPC	Arthur, Blaine, Brown, Cherry, Custer, Garden and 12 more	8 hr
May 17, 5:29 PM CDT	Mesoscale Discussion	SPC	Adams, Blaine, Boyd, Brown, Buffalo, Clay and 20 more	31 min
May 17, 5:45 PM CDT	Severe Thunderstorm Watch	SPC	Adams, Blaine, Boone, Boyd, Brown, Buffalo and 29 more	6 hr
May 17, 12:53 PM CDT	Mesoscale Discussion	SPC	Butte, Corson, Dewey, Haakon, Harding, Jackson and 8 more	2 hr
May 17, 2:30 PM CDT	Severe Thunderstorm Watch	SPC	Harding, Perkins	8 hr
May 17, 6:20 PM CDT	Mesoscale Discussion	SPC	Harding	85 min

Nearby

Mesoscale Discussions in Nebraska, 2005 Mesoscale Discussions in South Dakota, 2005 Every mesoscale discussion in 2005

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.