Alert archive / Nebraska / Mesoscale Discussions in 2014

Mesoscale Discussion 566

May 11, 20148 counties in Nebraska

The Storm Prediction Center issued this mesoscale discussion at May 11, 2014, 4:46 PM CDT for 8 counties in Nebraska. It was in force for 89 min.

The area

The outline as issued.

The facts

Issued: May 11, 2014, 4:46 PM CDT (21:46 UTC)
Expired: May 11, 2014, 6:15 PM CDT
In force: 89 min
Issued by: the Storm Prediction Center

Counties Butler County, NE, Cass County, NE, Douglas County, NE, Lancaster County, NE, Sarpy County, NE, Saunders County, NE, Seward County, NE, York County, NE

The radar

The Omaha radar (KOAX), 43 km from the middle of the area, began a volume at 21:50 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

Topeka, KS (KFOE), launched 12:00Z, 9.8 hours before the alert went out and 242 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: 1518 J/kg
Mixed-layer CIN: -20 J/kg
Mixed-layer LCL: 770 m above ground
0-6 km bulk shear: 48 kt
0-1 km storm-relative helicity: 379 m²/s²
0-3 km storm-relative helicity: 477 m²/s²
Significant tornado parameter: 4.0
Supercell composite: 17.0

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
May 11, 1:19 AM CDT	Mesoscale Discussion	SPC	Adams, Buffalo, Butler, Cass, Clay, Colfax and 35 more	2 hr
May 11, 2:58 AM CDT	Severe Thunderstorm Watch	SPC	Adams, Buffalo, Butler, Cass, Clay, Dawson and 31 more	7 hr
May 11, 7:02 AM CDT	Mesoscale Discussion	SPC	Butler, Cass, Douglas, Fillmore, Gage, Hamilton and 13 more	118 min
May 11, 12:49 PM CDT	Mesoscale Discussion	SPC	Adams, Cass, Clay, Douglas, Fillmore, Franklin and 16 more	116 min
May 11, 2:21 PM CDT	Tornado Watch	SPC	Adams, Butler, Cass, Clay, Dodge, Douglas and 21 more	8 hr
May 11, 5:31 PM CDT	Mesoscale Discussion	SPC	Adams, Clay, Fillmore, Franklin, Jefferson, Nuckolls and 2 more	89 min
May 11, 6:23 PM CDT	Mesoscale Discussion	SPC	Butler, Cass, Douglas, Hamilton, Lancaster, Otoe and 7 more	67 min

Nearby

Mesoscale Discussions in Nebraska, 2014 Every mesoscale discussion in 2014

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.