Alert archive / Nebraska / Mesoscale Discussions in 2004

Mesoscale Discussion 665

May 11, 200420 counties in Nebraska; Charles Mix County, Douglas County, Gregory County, South Dakota

The Storm Prediction Center issued this mesoscale discussion at May 11, 2004, 8:39 PM MDT for 20 counties in Nebraska; Charles Mix County, Douglas County, Gregory County, South Dakota. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: May 11, 2004, 8:39 PM MDT (02:39 UTC)
Expired: May 11, 2004, 10:45 PM MDT
In force: 2 hr
Issued by: the Storm Prediction Center

All 23 counties

Arthur County, NE, Blaine County, NE, Boyd County, NE, Brown County, NE, Cherry County, NE, Custer County, NE, Garfield County, NE, Grant County, NE, Holt County, NE, Hooker County, NE, Keith County, NE, Keya Paha County, NE, Lincoln County, NE, Logan County, NE, Loup County, NE, McPherson County, NE, Rock County, NE, Thomas County, NE, Valley County, NE, Wheeler County, NE, Charles Mix County, SD, Douglas County, SD, Gregory County, SD

The radar

The North Platte radar (KLNX), 44 km from the middle of the area, began a volume at 02:40 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, 2.7 hours before the alert went out and 121 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: 1951 J/kg
Mixed-layer CIN: -7 J/kg
Mixed-layer LCL: 2054 m above ground
0-6 km bulk shear: 23 kt
0-1 km storm-relative helicity: 111 m²/s²
0-3 km storm-relative helicity: 273 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 5.9

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
May 11, 7:02 PM MDT	Mesoscale Discussion	SPC	Arthur, Chase, Cherry, Deuel, Dundy, Garden and 5 more	118 min
May 11, 7:45 PM MDT	Severe Thunderstorm Watch	SPC	Brown, Clark, Codington, Day, Grant, Marshall and 2 more	5 hr
May 11, 9:08 PM MDT	Mesoscale Discussion	SPC	Brookings, Clark, Codington, Day, Deuel, Grant and 9 more	2 hr

Nearby

Mesoscale Discussions in Nebraska, 2004 Mesoscale Discussions in South Dakota, 2004 Every mesoscale discussion in 2004

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.