Alert archive / Nebraska / Mesoscale Discussions in 2005

Mesoscale Discussion 897

May 17, 200526 counties in Nebraska; 16 counties in South Dakota

The Storm Prediction Center issued this mesoscale discussion at May 17, 2005, 5:29 PM CDT for 26 counties in Nebraska; 16 counties in South Dakota. It was in force for 31 min.

The area

The outline as issued.

The facts

Issued: May 17, 2005, 5:29 PM CDT (22:29 UTC)
Expired: May 17, 2005, 6:00 PM CDT
In force: 31 min
Issued by: the Storm Prediction Center

All 42 counties

Adams County, NE, Blaine County, NE, Boyd County, NE, Brown County, NE, Buffalo County, NE, Clay County, NE, Custer County, NE, Dawson County, NE, Garfield County, NE, Gosper County, NE, Greeley County, NE, Hall County, NE, Hamilton County, NE, Holt County, NE, Howard County, NE, Kearney County, NE, Keya Paha County, NE, Logan County, NE, Loup County, NE, Merrick County, NE, Phelps County, NE, Rock County, NE, Sherman County, NE, Thomas County, NE, Valley County, NE, Wheeler County, NE, Brule County, SD, Buffalo County, SD, Dewey County, SD, Gregory County, SD, Haakon County, SD, Hughes County, SD, Hyde County, SD, Jones County, SD, Lyman County, SD, Mellette County, SD, Potter County, SD, Stanley County, SD, Sully County, SD, Todd County, SD, Tripp County, SD, Ziebach County, SD

The radar

The North Platte radar (KLNX), 75 km from the middle of the area, began a volume at 22:30 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 285May 17, 5:45 PM CDT

The nearest sounding before it

N. Platte/Lee Bi, NE (KLBF), launched 12:00Z, 10.5 hours before the alert went out and 161 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, 1:29 PM CDT	Mesoscale Discussion	SPC	Adams, Arthur, Blaine, Brown, Buffalo, Chase and 29 more	2 hr
May 17, 1:50 PM CDT	Severe Thunderstorm Watch	SPC	Arthur, Blaine, Brown, Cherry, Custer, Garden and 12 more	8 hr
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.