Alert archive / Nebraska / Mesoscale Discussions in 2003

Mesoscale Discussion 1727

July 8, 200334 counties in Nebraska; 4 counties in North Dakota; 13 counties in South Dakota

The Storm Prediction Center issued this mesoscale discussion at Jul 8, 2003, 11:30 PM CDT for 34 counties in Nebraska; 4 counties in North Dakota; 13 counties in South Dakota. It was in force for 60 min.

The area

The outline as issued.

The facts

Issued: Jul 8, 2003, 11:30 PM CDT (04:30 UTC)
Expired: Jul 9, 2003, 12:30 AM CDT
In force: 60 min
Issued by: the Storm Prediction Center

All 51 counties

Dickey County, ND, Emmons County, ND, Logan County, ND, McIntosh County, ND, Boone County, NE, Buffalo County, NE, Burt County, NE, Butler County, NE, Cherry County, NE, Clay County, NE, Colfax County, NE, Custer County, NE, Dakota County, NE, Dawson County, NE, Dixon County, NE, Dodge County, NE, Douglas County, NE, Fillmore County, NE, Greeley County, NE, Hall County, NE, Hamilton County, NE, Hooker County, NE, Howard County, NE, Lancaster County, NE, Lincoln County, NE, Logan County, NE, McPherson County, NE, Merrick County, NE, Nance County, NE, Platte County, NE, Polk County, NE, Saunders County, NE, Seward County, NE, Sherman County, NE, Thurston County, NE, Valley County, NE, Washington County, NE, York County, NE, Campbell County, SD, Edmunds County, SD, Faulk County, SD, Hughes County, SD, Hyde County, SD, Jones County, SD, Lyman County, SD, McPherson County, SD, Mellette County, SD, Potter County, SD, Sully County, SD, Todd County, SD, Walworth County, SD

The radar

The North Platte radar (KLNX), 165 km from the middle of the area, began a volume at 04:29 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.

The nearest sounding before it

N. Platte/Lee Bi, NE (KLBF), launched 00:00Z, 4.5 hours before the alert went out and 226 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, 11:45 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, 2:54 AM CDT	Mesoscale Discussion	SPC	Adams, Antelope, Boone, Boyd, Buffalo, Butler and 29 more	96 min
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
Jul 8, 7:00 PM CDT	Severe Thunderstorm Watch	SPC	Billings, Divide, Dunn, Golden Valley, McKenzie, Mountrail and 2 more	5 hr

Nearby

Mesoscale Discussions in Nebraska, 2003 Mesoscale Discussions in South Dakota, 2003 Mesoscale Discussions in North 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.