Alert archive / Nebraska / Mesoscale Discussions in 2005

Mesoscale Discussion 823

May 11, 200531 counties in Nebraska

The Storm Prediction Center issued this mesoscale discussion at May 11, 2005, 4:00 PM CDT for 31 counties in Nebraska. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: May 11, 2005, 4:00 PM CDT (21:00 UTC)
Expired: May 11, 2005, 6:00 PM CDT
In force: 2 hr
Issued by: the Storm Prediction Center

All 31 counties

Antelope County, NE, Arthur County, NE, Blaine County, NE, Boone County, NE, Brown County, NE, Buffalo County, NE, Cherry County, NE, Custer County, NE, Dawson County, NE, Garfield County, NE, Grant County, NE, Greeley County, NE, Hall County, NE, Hamilton County, NE, Holt County, NE, Hooker County, NE, Howard County, NE, Keith County, NE, Lincoln County, NE, Logan County, NE, Loup County, NE, McPherson County, NE, Merrick County, NE, Nance County, NE, Polk County, NE, Rock County, NE, Sherman County, NE, Thomas County, NE, Valley County, NE, Wheeler County, NE, York County, NE

The radar

The North Platte radar (KLNX), 69 km from the middle of the area, began a volume at 21:04 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 12:00Z, 9.0 hours before the alert went out and 95 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: 1 J/kg
Mixed-layer CIN: 0 J/kg
Mixed-layer LCL: 508 m above ground
0-6 km bulk shear: 49 kt
0-1 km storm-relative helicity: 189 m²/s²
0-3 km storm-relative helicity: 190 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

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 10, 7:00 PM CDT	Severe Thunderstorm Watch	SPC	Buffalo, Chase, Dawson, Dundy, Franklin, Frontier and 9 more	7 hr
May 10, 9:14 PM CDT	Mesoscale Discussion	SPC	Burt, Butler, Colfax, Cuming, Dakota, Dodge and 10 more	2 hr
May 11, 8:41 AM CDT	Mesoscale Discussion	SPC	Gage, Jefferson, Johnson, Nemaha, Pawnee, Richardson	2 hr
May 11, 11:45 AM CDT	Tornado Watch	SPC	Pawnee, Richardson	7 hr
May 11, 2:36 PM CDT	Mesoscale Discussion	SPC	Dundy, Franklin, Furnas, Harlan, Hitchcock, Red Willow	114 min
May 11, 2:55 PM CDT	Tornado Watch	SPC	Adams, Clay, Fillmore, Franklin, Gosper, Harlan and 7 more	7 hr
May 11, 3:10 PM CDT	Tornado Watch	SPC	Dundy, Hitchcock, Red Willow	7 hr
May 11, 3:55 PM CDT	Severe Thunderstorm Watch	SPC	Adams, Arthur, Boone, Buffalo, Butler, Chase and 34 more	8 hr
May 11, 4:53 PM CDT	Mesoscale Discussion	SPC	Adams, Clay, Fillmore, Franklin, Gosper, Harlan and 7 more	97 min
May 11, 5:13 PM CDT	Mesoscale Discussion	SPC	Dundy, Hitchcock, Red Willow	92 min
May 11, 6:45 PM CDT	Severe Thunderstorm Watch	SPC	Gage, Johnson, Nemaha, Pawnee, Richardson	7 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.