Alert archive / Nebraska / Mesoscale Discussions in 2005

Mesoscale Discussion 1805

July 20, 200511 counties in Nebraska

The Storm Prediction Center issued this mesoscale discussion at Jul 20, 2005, 11:32 PM CDT for 11 counties in Nebraska. It was in force for 58 min.

The area

The outline as issued.

The facts

Issued: Jul 20, 2005, 11:32 PM CDT (04:32 UTC)
Expired: Jul 21, 2005, 12:30 AM CDT
In force: 58 min
Issued by: the Storm Prediction Center

Counties Buffalo County, NE, Custer County, NE, Dawson County, NE, Hall County, NE, Hamilton County, NE, Howard County, NE, Merrick County, NE, Nance County, NE, Polk County, NE, Sherman County, NE, York County, NE

The radar

The Grand Island radar (KUEX), 119 km from the middle of the area, began a volume at 04:35 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 nearest sounding before it

N. Platte/Lee Bi, NE (KLBF), launched 00:00Z, 4.5 hours before the alert went out and 116 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: 757 J/kg
Mixed-layer CIN: -165 J/kg
Mixed-layer LCL: 3650 m above ground
0-6 km bulk shear: 34 kt
0-1 km storm-relative helicity: 37 m²/s²
0-3 km storm-relative helicity: 64 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.6

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 20, 9:46 PM CDT	Mesoscale Discussion	SPC	Antelope, Blaine, Boone, Boyd, Brown, Cedar and 13 more	89 min
Jul 20, 10:10 PM CDT	Severe Thunderstorm Watch	SPC	Antelope, Boone, Boyd, Burt, Cedar, Colfax and 16 more	4 hr

Nearby

Mesoscale Discussions in Nebraska, 2005 Every mesoscale discussion in 2005

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.