Alert archive / Nebraska / Mesoscale Discussions in 2004

Mesoscale Discussion 1499

July 4, 200419 counties in Nebraska

The Storm Prediction Center issued this mesoscale discussion at Jul 4, 2004, 12:28 PM MDT for 19 counties in Nebraska. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Jul 4, 2004, 12:28 PM MDT (18:28 UTC)
Expired: Jul 4, 2004, 2:30 PM MDT
In force: 2 hr
Issued by: the Storm Prediction Center

Counties Arthur County, NE, Blaine County, NE, Box Butte County, NE, Chase County, NE, Cherry County, NE, Deuel County, NE, Frontier County, NE, Garden County, NE, Grant County, NE, Hayes County, NE, Hooker County, NE, Keith County, NE, Lincoln County, NE, Logan County, NE, McPherson County, NE, Morrill County, NE, Perkins County, NE, Sheridan County, NE, Thomas County, NE

The radar

The North Platte radar (KLNX), 81 km from the middle of the area, began a volume at 18:32 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 551Jul 4, 1:15 PM MDT

The nearest sounding before it

N. Platte/Lee Bi, NE (KLBF), launched 12:00Z, 6.5 hours before the alert went out and 99 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: 2357 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: 52 m²/s²
0-3 km storm-relative helicity: 74 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 3, 8:41 PM MDT	Mesoscale Discussion	SPC	Burt, Butler, Clay, Colfax, Cuming, Dodge and 21 more	64 min
Jul 3, 9:10 PM MDT	Severe Thunderstorm Watch	SPC	Fillmore, Gage, Jefferson, Johnson, Lancaster, Nemaha and 7 more	6 hr
Jul 4, 1:15 PM MDT	Severe Thunderstorm Watch	SPC	Arthur, Blaine, Box Butte, Brown, Chase, Cherry and 21 more	8 hr
Jul 4, 4:24 PM MDT	Mesoscale Discussion	SPC	Arthur, Blaine, Box Butte, Brown, Chase, Cherry and 22 more	96 min

Nearby

Mesoscale Discussions in Nebraska, 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.