Alert archive / Nebraska / Mesoscale Discussions in 2011

Mesoscale Discussion 1952

August 12, 201112 counties in Kansas; 4 counties in Missouri; 33 counties in Nebraska

The Storm Prediction Center issued this mesoscale discussion at Aug 12, 2011, 1:45 AM CDT for 12 counties in Kansas; 4 counties in Missouri; 33 counties in Nebraska. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Aug 12, 2011, 1:45 AM CDT (06:45 UTC)
Expired: Aug 12, 2011, 3:45 AM CDT
In force: 2 hr
Issued by: the Storm Prediction Center

All 49 counties

Atchison County, KS, Brown County, KS, Doniphan County, KS, Jackson County, KS, Jefferson County, KS, Leavenworth County, KS, Marshall County, KS, Nemaha County, KS, Pottawatomie County, KS, Republic County, KS, Riley County, KS, Washington County, KS, Buchanan County, MO, Clay County, MO, Holt County, MO, Platte County, MO, Adams County, NE, Blaine County, NE, Buffalo County, NE, Cherry County, NE, Clay County, NE, Custer County, NE, Dawson County, NE, Fillmore County, NE, Gage County, NE, Hall County, NE, Hamilton County, NE, Hooker County, NE, Howard County, NE, Jefferson County, NE, Johnson County, NE, Kearney County, NE, Logan County, NE, Loup County, NE, Merrick County, NE, Nemaha County, NE, Nuckolls County, NE, Otoe County, NE, Pawnee County, NE, Phelps County, NE, Richardson County, NE, Saline County, NE, Seward County, NE, Sherman County, NE, Thayer County, NE, Thomas County, NE, Valley County, NE, Webster County, NE, York County, NE

The radar

The Grand Island radar (KUEX), 46 km from the middle of the area, began a volume at 07:02 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

Omaha, NE (KOAX), launched 00:00Z, 6.8 hours before the alert went out and 177 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: 417 J/kg
Mixed-layer CIN: -214 J/kg
Mixed-layer LCL: 1393 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: 42 m²/s²
0-3 km storm-relative helicity: 110 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
Aug 12, 2:28 PM CDT	Mesoscale Discussion	SPC	Barber, Clark, Comanche, Edwards, Finney, Ford and 13 more	62 min
Aug 12, 2:50 PM CDT	Severe Thunderstorm Watch	SPC	Barber, Barton, Butler, Chautauqua, Clark, Comanche and 31 more	7 hr
Aug 12, 1:44 PM CDT	Mesoscale Discussion	SPC	Camden, Christian, Crawford, Dade, Dallas, Dent and 26 more	91 min
Aug 11, 7:19 PM CDT	Severe Thunderstorm Watch	SPC	Antelope, Boone, Burt, Cedar, Colfax, Cuming and 9 more	5 hr
Aug 11, 9:22 PM CDT	Mesoscale Discussion	SPC	Blaine, Boyd, Brown, Cherry, Garfield, Grant and 8 more	53 min
Aug 11, 9:42 PM CDT	Mesoscale Discussion	SPC	Antelope, Boone, Burt, Cedar, Colfax, Cuming and 12 more	63 min
Aug 11, 10:16 PM CDT	Severe Thunderstorm Watch	SPC	Adams, Buffalo, Clay, Dawson, Fillmore, Gosper and 12 more	6 hr

Nearby

Mesoscale Discussions in Nebraska, 2011 Mesoscale Discussions in Kansas, 2011 Mesoscale Discussions in Missouri, 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.