Alert archive / Nebraska / Mesoscale Discussions in 2014

Mesoscale Discussion 559

May 11, 20145 counties in Iowa; Atchison County, Holt County, Missouri; 19 counties in Nebraska

The Storm Prediction Center issued this mesoscale discussion at May 11, 2014, 7:02 AM CDT for 5 counties in Iowa; Atchison County, Holt County, Missouri; 19 counties in Nebraska. It was in force for 118 min.

The area

The outline as issued.

The facts

Issued: May 11, 2014, 7:02 AM CDT (12:02 UTC)
Expired: May 11, 2014, 9:00 AM CDT
In force: 118 min
Issued by: the Storm Prediction Center

All 26 counties

Fremont County, IA, Mills County, IA, Montgomery County, IA, Page County, IA, Pottawattamie County, IA, Atchison County, MO, Holt County, MO, Butler County, NE, Cass County, NE, Douglas County, NE, Fillmore County, NE, Gage County, NE, Hamilton County, NE, Johnson County, NE, Lancaster County, NE, Merrick County, NE, Nemaha County, NE, Otoe County, NE, Pawnee County, NE, Polk County, NE, Richardson County, NE, Saline County, NE, Sarpy County, NE, Saunders County, NE, Seward County, NE, York County, NE

The radar

The Omaha radar (KOAX), 73 km from the middle of the area, began a volume at 12:03 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, 0.0 hours before the alert went out and 195 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, Cass, Fremont, Harrison, Mills, Montgomery and 3 more	2 hr
May 11, 2:58 AM CDT	Severe Thunderstorm Watch	SPC	Fremont, Mills, Montgomery, Page, Pottawattamie	7 hr
May 11, 9:16 AM CDT	Mesoscale Discussion	SPC	Adair, Adams, Appanoose, Audubon, Benton, Black Hawk and 64 more	89 min
May 11, 10:47 AM CDT	Mesoscale Discussion	SPC	Appanoose, Clarke, Davis, Decatur, Des Moines, Henry and 19 more	118 min
May 11, 11:53 AM CDT	Tornado Watch	SPC	Appanoose, Benton, Cedar, Clarke, Clinton, Davis and 26 more	7 hr
May 11, 12:49 PM CDT	Mesoscale Discussion	SPC	Adams, Cass, Fremont, Mills, Montgomery, Page and 2 more	116 min
May 11, 12:51 PM CDT	Mesoscale Discussion	SPC	Appanoose, Cedar, Clinton, Davis, Des Moines, Dubuque and 14 more	54 min
May 11, 2:21 PM CDT	Tornado Watch	SPC	Adair, Adams, Audubon, Cass, Fremont, Harrison and 8 more	8 hr
May 11, 2:36 PM CDT	Mesoscale Discussion	SPC	Des Moines, Henry, Iowa, Jefferson, Johnson, Keokuk and 5 more	84 min
May 11, 5:09 PM CDT	Mesoscale Discussion	SPC	Des Moines, Henry, Jefferson, Lee, Louisa, Van Buren and 1 more	66 min
May 11, 6:23 PM CDT	Mesoscale Discussion	SPC	Adair, Adams, Cass, Fremont, Mills, Montgomery and 5 more	67 min
May 10, 7:55 PM CDT	Mesoscale Discussion	SPC	Audrain, Boone, Callaway, Carroll, Chariton, Cole and 22 more	95 min
May 10, 7:59 PM CDT	Mesoscale Discussion	SPC	Andrew, Bates, Buchanan, Caldwell, Carroll, Cass and 19 more	91 min
May 10, 10:22 PM CDT	Mesoscale Discussion	SPC	Audrain, Callaway, Franklin, Gasconade, Jefferson, Lincoln and 12 more	83 min
May 11, 4:46 PM CDT	Mesoscale Discussion	SPC	Butler, Cass, Douglas, Lancaster, Sarpy, Saunders and 2 more	89 min
May 11, 5:31 PM CDT	Mesoscale Discussion	SPC	Adams, Clay, Fillmore, Franklin, Jefferson, Nuckolls and 2 more	89 min

Nearby

Mesoscale Discussions in Nebraska, 2014 Mesoscale Discussions in Iowa, 2014 Mesoscale Discussions in Missouri, 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.