Alert archive / Nebraska / Mesoscale Discussions in 2011

Mesoscale Discussion 1510

July 5, 20115 counties in Iowa; Atchison County, Missouri; 42 counties in Nebraska

The Storm Prediction Center issued this mesoscale discussion at Jul 5, 2011, 2:49 PM CDT for 5 counties in Iowa; Atchison County, Missouri; 42 counties in Nebraska. It was in force for 86 min.

The area

The outline as issued.

The facts

Issued: Jul 5, 2011, 2:49 PM CDT (19:49 UTC)
Expired: Jul 5, 2011, 4:15 PM CDT
In force: 86 min
Issued by: the Storm Prediction Center

All 48 counties

Fremont County, IA, Mills County, IA, Montgomery County, IA, Page County, IA, Pottawattamie County, IA, Atchison County, MO, Adams County, NE, Boone County, NE, Buffalo County, NE, Butler County, NE, Cass County, NE, Clay County, NE, Colfax County, NE, Custer County, NE, Dawson County, NE, Dodge County, NE, Douglas County, NE, Fillmore County, NE, Gage County, NE, Garfield County, NE, Greeley County, NE, Hall County, NE, Hamilton County, NE, Howard County, NE, Johnson County, NE, Kearney County, NE, Lancaster County, NE, Lincoln County, NE, Logan County, NE, Loup County, NE, Madison County, NE, Merrick County, NE, Nance County, NE, Nemaha County, NE, Otoe County, NE, Pawnee 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, Valley County, NE, Washington County, NE, Wheeler County, NE, York County, NE

The radar

The Grand Island radar (KUEX), 105 km from the middle of the area, began a volume at 19:50 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 watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

Severe Thunderstorm Watch 600Jul 5, 4:50 PM CDT

The nearest sounding before it

Omaha, NE (KOAX), launched 12:00Z, 7.8 hours before the alert went out and 124 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: 939 J/kg
Mixed-layer CIN: -259 J/kg
Mixed-layer LCL: 1038 m above ground
0-6 km bulk shear: 42 kt
0-1 km storm-relative helicity: 9 m²/s²
0-3 km storm-relative helicity: 43 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.8

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
Jul 5, 3:32 PM CDT	Mesoscale Discussion	SPC	Adair, Audubon, Boone, Buena Vista, Calhoun, Carroll and 23 more	88 min
Jul 5, 4:47 PM CDT	Severe Thunderstorm Watch	SPC	Fremont, Mills, Montgomery, Page, Pottawattamie	8 hr
Jul 5, 6:10 PM CDT	Tornado Watch	SPC	Adair, Adams, Appanoose, Audubon, Boone, Calhoun and 24 more	4 hr
Jul 4, 11:14 PM CDT	Mesoscale Discussion	SPC	Boyd, Brown, Holt, Keya Paha, Rock	91 min
Jul 5, 2:17 PM CDT	Mesoscale Discussion	SPC	Dawes, Sheridan	73 min
Jul 5, 6:19 PM CDT	Mesoscale Discussion	SPC	Cheyenne	56 min

Nearby

Mesoscale Discussions in Nebraska, 2011 Mesoscale Discussions in Iowa, 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.