Alert archive / Nebraska / Mesoscale Discussions in 2004

Mesoscale Discussion 663

May 11, 2004Phillips County, Sedgwick County, Colorado; 11 counties in Nebraska

The Storm Prediction Center issued this mesoscale discussion at May 11, 2004, 7:02 PM MDT for Phillips County, Sedgwick County, Colorado; 11 counties in Nebraska. It was in force for 118 min.

The area

The outline as issued.

The facts

Issued: May 11, 2004, 7:02 PM MDT (01:02 UTC)
Expired: May 11, 2004, 9:00 PM MDT
In force: 118 min
Issued by: the Storm Prediction Center

Counties Phillips County, CO, Sedgwick County, CO, Arthur County, NE, Chase County, NE, Cherry County, NE, Deuel County, NE, Dundy County, NE, Garden County, NE, Grant County, NE, Hooker County, NE, Keith County, NE, McPherson County, NE, Perkins County, NE

The radar

The North Platte radar (KLNX), 141 km from the middle of the area, began a volume at 01:05 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, 1.0 hours before the alert went out and 108 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 12, 5:14 PM MDT	Mesoscale Discussion	SPC	Bent, Cheyenne, Crowley, Kiowa, Kit Carson, Lincoln and 1 more	61 min
May 12, 5:35 PM MDT	Severe Thunderstorm Watch	SPC	Cheyenne, Kiowa, Kit Carson, Prowers	5 hr
May 11, 8:39 PM MDT	Mesoscale Discussion	SPC	Arthur, Blaine, Boyd, Brown, Cherry, Custer and 14 more	2 hr

Nearby

Mesoscale Discussions in Nebraska, 2004 Mesoscale Discussions in Colorado, 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.