Alert archive / Nebraska / Mesoscale Discussions in 2003

Mesoscale Discussion 1729

July 9, 200335 counties in Nebraska; 16 counties in South Dakota

The Storm Prediction Center issued this mesoscale discussion at Jul 9, 2003, 2:54 AM CDT for 35 counties in Nebraska; 16 counties in South Dakota. It was in force for 96 min.

The area

The outline as issued.

The facts

Issued: Jul 9, 2003, 2:54 AM CDT (07:54 UTC)
Expired: Jul 9, 2003, 4:30 AM CDT
In force: 96 min
Issued by: the Storm Prediction Center

All 51 counties

Adams County, NE, Antelope County, NE, Boone County, NE, Boyd County, NE, Buffalo County, NE, Butler County, NE, Cedar County, NE, Clay County, NE, Colfax County, NE, Fillmore County, NE, Garfield County, NE, Greeley County, NE, Hall County, NE, Hamilton County, NE, Holt County, NE, Howard County, NE, Jefferson County, NE, Kearney County, NE, Knox County, NE, Loup County, NE, Madison County, NE, Merrick County, NE, Nance County, NE, Pierce County, NE, Platte County, NE, Polk County, NE, Saline County, NE, Seward County, NE, Sherman County, NE, Stanton County, NE, Thayer County, NE, Valley County, NE, Wayne County, NE, Wheeler County, NE, York County, NE, Aurora County, SD, Bon Homme County, SD, Brule County, SD, Buffalo County, SD, Charles Mix County, SD, Clay County, SD, Davison County, SD, Douglas County, SD, Hanson County, SD, Hutchinson County, SD, Jerauld County, SD, McCook County, SD, Miner County, SD, Sanborn County, SD, Turner County, SD, Yankton County, SD

The radar

The North Platte radar (KLNX), 162 km from the middle of the area, began a volume at 07:55 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, 7.9 hours before the alert went out and 187 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: 2953 J/kg
Mixed-layer CIN: -140 J/kg
Mixed-layer LCL: 1593 m above ground
0-6 km bulk shear: 50 kt
0-1 km storm-relative helicity: 61 m²/s²
0-3 km storm-relative helicity: 228 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 3.5

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 8, 8:45 PM CDT	Tornado Watch	SPC	Antelope, Blaine, Boyd, Brown, Cedar, Cherry and 16 more	5 hr
Jul 8, 11:30 PM CDT	Mesoscale Discussion	SPC	Boone, Buffalo, Burt, Butler, Cherry, Clay and 28 more	60 min
Jul 8, 11:45 PM CDT	Tornado Watch	SPC	Adams, Antelope, Blaine, Boone, Boyd, Brown and 42 more	5 hr
Jul 9, 1:10 AM CDT	Severe Thunderstorm Watch	SPC	Burt, Cass, Dakota, Dodge, Douglas, Otoe and 4 more	6 hr
Jul 9, 4:15 AM CDT	Mesoscale Discussion	SPC	Cass, Douglas, Sarpy, Washington	2 hr
Jul 9, 2:10 PM CDT	Mesoscale Discussion	SPC	Richardson	35 min
Jul 9, 3:55 PM CDT	Severe Thunderstorm Watch	SPC	Nemaha, Richardson	6 hr

Nearby

Mesoscale Discussions in Nebraska, 2003 Mesoscale Discussions in South Dakota, 2003 Every mesoscale discussion in 2003

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.