Alert archive / Nebraska / Mesoscale Discussions in 2005

Mesoscale Discussion 603

April 19, 200529 counties in Nebraska; 14 counties in South Dakota

The Storm Prediction Center issued this mesoscale discussion at Apr 19, 2005, 10:56 PM CDT for 29 counties in Nebraska; 14 counties in South Dakota. It was in force for 94 min.

The area

The outline as issued.

The facts

Issued: Apr 19, 2005, 10:56 PM CDT (03:56 UTC)
Expired: Apr 20, 2005, 12:30 AM CDT
In force: 94 min
Issued by: the Storm Prediction Center

All 43 counties

Antelope County, NE, Blaine County, NE, Boyd County, NE, Brown County, NE, Buffalo County, NE, Cedar County, NE, Custer County, NE, Dakota County, NE, Dawson County, NE, Dixon County, NE, Garfield County, NE, Greeley County, NE, Hall County, NE, Holt County, NE, Howard County, NE, Keya Paha County, NE, Knox County, NE, Lincoln County, NE, Logan County, NE, Loup County, NE, Madison County, NE, Pierce County, NE, Rock County, NE, Sherman County, NE, Stanton County, NE, Thomas County, NE, Valley County, NE, Wayne County, NE, Wheeler County, NE, Aurora County, SD, Bon Homme County, SD, Brule County, SD, Charles Mix County, SD, Clay County, SD, Davison County, SD, Douglas County, SD, Gregory County, SD, Hanson County, SD, Hutchinson County, SD, McCook County, SD, Turner County, SD, Union County, SD, Yankton County, SD

The radar

The North Platte radar (KLNX), 127 km from the middle of the area, began a volume at 03:59 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, 3.9 hours before the alert went out and 182 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: 1502 J/kg
Mixed-layer CIN: -23 J/kg
Mixed-layer LCL: 1658 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: 51 m²/s²
0-3 km storm-relative helicity: 230 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 3.9

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
Apr 19, 7:21 PM CDT	Mesoscale Discussion	SPC	Arthur, Banner, Box Butte, Brown, Chase, Cherry and 16 more	114 min
Apr 19, 7:38 PM CDT	Mesoscale Discussion	SPC	Antelope, Boone, Burt, Butler, Colfax, Cuming and 22 more	2 hr
Apr 19, 9:30 PM CDT	Severe Thunderstorm Watch	SPC	Blaine, Brown, Buffalo, Custer, Dawson, Garfield and 14 more	8 hr
Apr 20, 1:14 AM CDT	Mesoscale Discussion	SPC	Antelope, Boone, Burt, Butler, Cedar, Colfax and 15 more	2 hr
Apr 20, 1:18 AM CDT	Mesoscale Discussion	SPC	Antelope, Boone, Burt, Butler, Cedar, Colfax and 15 more	117 min
Apr 20, 6:23 PM CDT	Mesoscale Discussion	SPC	Banner, Box Butte, Cheyenne, Dawes, Deuel, Garden and 4 more	97 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.