Alert archive / Nebraska / Mesoscale Discussions in 2003

Mesoscale Discussion 464

April 15, 200325 counties in Nebraska; 10 counties in South Dakota

The Storm Prediction Center issued this mesoscale discussion at Apr 15, 2003, 4:46 PM CDT for 25 counties in Nebraska; 10 counties in South Dakota. It was in force for 89 min.

The area

The outline as issued.

The facts

Issued: Apr 15, 2003, 4:46 PM CDT (21:46 UTC)
Expired: Apr 15, 2003, 6:15 PM CDT
In force: 89 min
Issued by: the Storm Prediction Center

All 35 counties

Antelope County, NE, Blaine County, NE, Boone County, NE, Boyd County, NE, Brown County, NE, Cedar County, NE, Custer County, NE, Dixon County, NE, Garfield County, NE, Greeley County, NE, Holt County, NE, Keya Paha County, NE, Knox County, NE, Logan County, NE, Loup County, NE, Madison County, NE, Nance County, NE, Pierce County, NE, Platte County, NE, Rock County, NE, Stanton County, NE, Thomas County, NE, Valley County, NE, Wayne County, NE, Wheeler County, NE, Bon Homme County, SD, Charles Mix County, SD, Clay County, SD, Douglas County, SD, Gregory County, SD, Hutchinson County, SD, Lincoln County, SD, Turner County, SD, Union County, SD, Yankton County, SD

The watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

Severe Thunderstorm Watch 121Apr 15, 5:15 PM CDT

The nearest sounding before it

N. Platte/Lee Bi, NE (KLBF), launched 12:00Z, 9.8 hours before the alert went out and 202 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 3632 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 120 m²/s²
0-3 km storm-relative helicity: 131 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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 15, 3:45 PM CDT	Tornado Watch	SPC	Buffalo, Dawson, Dundy, Franklin, Frontier, Furnas and 9 more	5 hr
Apr 15, 5:15 PM CDT	Severe Thunderstorm Watch	SPC	Antelope, Blaine, Boone, Boyd, Brown, Cedar and 25 more	6 hr
Apr 15, 6:57 PM CDT	Mesoscale Discussion	SPC	Buffalo, Dawson, Franklin, Frontier, Furnas, Gosper and 5 more	93 min
Apr 15, 4:07 PM CDT	Mesoscale Discussion	SPC	Beadle, Brookings, Clark, Codington, Deuel, Grant and 8 more	2 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.