Alert archive / Nebraska / Mesoscale Discussions in 2011

Mesoscale Discussion 760

May 12, 201145 counties in Nebraska

The Storm Prediction Center issued this mesoscale discussion at May 12, 2011, 2:06 PM CDT for 45 counties in Nebraska. It was in force for 114 min.

The area

The outline as issued.

The facts

Issued: May 12, 2011, 2:06 PM CDT (19:06 UTC)
Expired: May 12, 2011, 4:00 PM CDT
In force: 114 min
Issued by: the Storm Prediction Center

All 45 counties

Adams County, NE, Boone County, NE, Buffalo County, NE, Butler County, NE, Cass County, NE, Clay County, NE, Colfax County, NE, Cuming County, NE, Dawson County, NE, Dodge County, NE, Douglas County, NE, Fillmore County, NE, Franklin County, NE, Furnas County, NE, Gage County, NE, Gosper County, NE, Greeley County, NE, Hall County, NE, Hamilton County, NE, Harlan County, NE, Howard County, NE, Jefferson County, NE, Johnson County, NE, Kearney County, NE, Lancaster County, NE, Madison County, NE, Merrick County, NE, Nance County, NE, Nuckolls County, NE, Otoe County, NE, Pawnee County, NE, Phelps County, NE, Platte County, NE, Polk County, NE, Saline County, NE, Sarpy County, NE, Saunders County, NE, Seward County, NE, Sherman County, NE, Stanton County, NE, Thayer County, NE, Valley County, NE, Washington County, NE, Webster County, NE, York County, NE

The radar

The Grand Island radar (KUEX), 57 km from the middle of the area, began a volume at 19:08 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.

Tornado Watch 292May 12, 2:40 PM CDT

The nearest sounding before it

Omaha, NE (KOAX), launched 12:00Z, 7.1 hours before the alert went out and 152 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: 353 J/kg
Mixed-layer CIN: -73 J/kg
Mixed-layer LCL: 759 m above ground
0-6 km bulk shear: 21 kt
0-1 km storm-relative helicity: 40 m²/s²
0-3 km storm-relative helicity: 82 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.3

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 11, 7:51 PM CDT	Mesoscale Discussion	SPC	Dundy, Frontier, Furnas, Hayes, Hitchcock, Red Willow	84 min
May 11, 8:16 PM CDT	Mesoscale Discussion	SPC	Cass, Johnson, Nemaha, Otoe, Pawnee, Richardson	59 min
May 12, 2:37 PM CDT	Tornado Watch	SPC	Adams, Boone, Buffalo, Burt, Butler, Cass and 38 more	7 hr
May 12, 5:35 PM CDT	Mesoscale Discussion	SPC	Adams, Buffalo, Burt, Butler, Cass, Clay and 30 more	85 min

Nearby

Mesoscale Discussions in Nebraska, 2011 Every mesoscale discussion in 2011

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.