Alert archive / Nebraska / Mesoscale Discussions in 2004

Mesoscale Discussion 1575

July 8, 200415 counties in Nebraska; Bennett County, Jackson County, South Dakota

The Storm Prediction Center issued this mesoscale discussion at Jul 8, 2004, 5:35 PM MDT for 15 counties in Nebraska; Bennett County, Jackson County, South Dakota. It was in force for 115 min.

The area

The outline as issued.

The facts

Issued: Jul 8, 2004, 5:35 PM MDT (23:35 UTC)
Expired: Jul 8, 2004, 7:30 PM MDT
In force: 115 min
Issued by: the Storm Prediction Center

Counties Arthur County, NE, Banner County, NE, Box Butte County, NE, Cherry County, NE, Cheyenne County, NE, Deuel County, NE, Garden County, NE, Grant County, NE, Hooker County, NE, Keith County, NE, Kimball County, NE, McPherson County, NE, Morrill County, NE, Scotts Bluff County, NE, Sheridan County, NE, Bennett County, SD, Jackson County, SD

The radar

The North Platte radar (KLNX), 138 km from the middle of the area, began a volume at 23:35 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.

Severe Thunderstorm Watch 593Jul 8, 7:05 PM MDT

The nearest sounding before it

N. Platte/Lee Bi, NE (KLBF), launched 12:00Z, 11.6 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: 612 J/kg
Mixed-layer CIN: -624 J/kg
Mixed-layer LCL: 1285 m above ground
0-6 km bulk shear: 21 kt
0-1 km storm-relative helicity: 177 m²/s²
0-3 km storm-relative helicity: 151 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
Jul 8, 2:18 PM MDT	Mesoscale Discussion	SPC	Banner, Box Butte, Cheyenne, Dawes, Kimball, Morrill and 2 more	117 min
Jul 8, 2:40 PM MDT	Severe Thunderstorm Watch	SPC	Arthur, Banner, Box Butte, Cherry, Cheyenne, Dawes and 11 more	6 hr
Jul 7, 7:20 PM MDT	Mesoscale Discussion	SPC	Butte, Harding, Meade, Perkins	85 min
Jul 7, 8:10 PM MDT	Severe Thunderstorm Watch	SPC	Butte, Harding, Meade, Perkins	5 hr
Jul 8, 12:34 AM MDT	Mesoscale Discussion	SPC	Corson	86 min

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.