Alert archive / Nebraska / Mesoscale Discussions in 2011

Mesoscale Discussion 818

May 19, 2011Marshall County, Nemaha County, Washington County, Kansas; 38 counties in Nebraska

The Storm Prediction Center issued this mesoscale discussion at May 19, 2011, 6:38 PM CDT for Marshall County, Nemaha County, Washington County, Kansas; 38 counties in Nebraska. It was in force for 97 min.

The area

The outline as issued.

The facts

Issued: May 19, 2011, 6:38 PM CDT (23:38 UTC)
Expired: May 19, 2011, 8:15 PM CDT
In force: 97 min
Issued by: the Storm Prediction Center

All 41 counties

Marshall County, KS, Nemaha County, KS, Washington County, KS, Adams County, NE, Boone County, NE, Buffalo County, NE, Butler County, NE, Cass County, NE, Clay County, NE, Custer County, NE, Dawson County, NE, Fillmore County, NE, Franklin 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, Merrick County, NE, Nance County, NE, Nemaha County, NE, Nuckolls County, NE, Otoe County, NE, Pawnee County, NE, Phelps County, NE, Polk County, NE, Richardson County, NE, Saline County, NE, Saunders County, NE, Seward County, NE, Sherman County, NE, Thayer County, NE, Valley County, NE, Webster County, NE, York County, NE

The radar

The Grand Island radar (KUEX), 44 km from the middle of the area, began a volume at 23:40 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 310May 19, 8:50 PM CDT

The nearest sounding before it

N. Platte/Lee Bi, NE (KLBF), launched 12:00Z, 11.6 hours before the alert went out and 227 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 549 m above ground
0-6 km bulk shear: 45 kt
0-1 km storm-relative helicity: 226 m²/s²
0-3 km storm-relative helicity: 315 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
May 18, 10:25 PM CDT	Mesoscale Discussion	SPC	Allen, Barton, Butler, Chase, Chautauqua, Cheyenne and 60 more	2 hr
May 19, 1:12 PM CDT	Mesoscale Discussion	SPC	Barber, Barton, Butler, Comanche, Cowley, Dickinson and 26 more	63 min
May 19, 1:43 PM CDT	Tornado Watch	SPC	Barber, Barton, Butler, Chase, Clark, Clay and 43 more	7 hr
May 19, 2:24 PM CDT	Mesoscale Discussion	SPC	Finney, Grant, Greeley, Hamilton, Haskell, Kearny and 7 more	66 min
May 19, 3:44 PM CDT	Mesoscale Discussion	SPC	Barber, Barton, Butler, Clark, Clay, Cloud and 40 more	61 min
May 19, 5:42 PM CDT	Mesoscale Discussion	SPC	Barber, Barton, Clark, Clay, Cloud, Comanche and 37 more	2 hr

Nearby

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