Alert archive / Nebraska / Mesoscale Discussions in 2016

Mesoscale Discussion 570

May 9, 201613 counties in Iowa; Atchison County, Missouri; 43 counties in Nebraska

The Storm Prediction Center issued this mesoscale discussion at May 9, 2016, 4:52 PM CDT for 13 counties in Iowa; Atchison County, Missouri; 43 counties in Nebraska. It was in force for 53 min.

The area

The outline as issued.

The facts

Issued
May 9, 2016, 4:52 PM CDT (21:52 UTC)
Expired
May 9, 2016, 5:45 PM CDT
In force
53 min
Issued by
the Storm Prediction Center
Chance of a watch
95%
All 57 counties

Adams County, IA, Audubon County, IA, Cass County, IA, Crawford County, IA, Fremont County, IA, Harrison County, IA, Mills County, IA, Monona County, IA, Montgomery County, IA, Page County, IA, Pottawattamie County, IA, Shelby County, IA, Taylor County, IA, Atchison County, MO, Adams County, NE, Boone County, NE, Buffalo County, NE, Burt County, NE, Butler County, NE, Cass County, NE, Clay County, NE, Colfax County, NE, Cuming County, NE, Dodge County, NE, Douglas County, NE, Fillmore County, NE, Franklin County, NE, Gage County, NE, Greeley County, NE, Hall County, NE, Hamilton 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, Platte County, NE, Polk County, NE, Richardson County, NE, Saline County, NE, Sarpy County, NE, Saunders County, NE, Seward County, NE, Sherman County, NE, Stanton County, NE, Thayer County, NE, Valley County, NE, Washington County, NE, Webster County, NE, York County, NE

The radar

The Omaha radar (KOAX), 78 km from the middle of the area, began a volume at 21:57 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.

The nearest sounding before it

Omaha, NE (KOAX), launched 12:00Z, 9.9 hours before the alert went out and 77 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-pSkew-T log-p diagram, Omaha, NE at 12:00Z on 2016-05-09Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Omaha, NE at 12:00Z on 2016-05-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 240 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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
1443 m above ground
0-6 km bulk shear
49 kt
0-1 km storm-relative helicity
240 m²/s²
0-3 km storm-relative helicity
204 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

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SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 9, 2:26 PM CDTMesoscale DiscussionSPCCherokee, Clay, Lyon, O'Brien, Osceola, Plymouth and 2 more94 min
May 9, 5:13 PM CDTSevere Thunderstorm WatchSPCAdair, Adams, Audubon, Calhoun, Carroll, Cass and 15 more6 hr
May 9, 1:46 PM CDTMesoscale DiscussionSPCAtchison, Buchanan, Holt, Platte59 min
May 9, 6:38 PM CDTMesoscale DiscussionSPCBollinger, Butler, Carter, Dunklin, Howell, Madison and 6 more97 min
May 8, 7:48 PM CDTMesoscale DiscussionSPCAdams, Blaine, Brown, Buffalo, Clay, Custer and 23 more117 min
May 8, 9:08 PM CDTSevere Thunderstorm WatchSPCJefferson, Saline, Seward3 hr
May 8, 11:17 PM CDTMesoscale DiscussionSPCGage, Jefferson, Johnson, Lancaster, Otoe, Saline and 2 more88 min
May 9, 3:35 AM CDTMesoscale DiscussionSPCGage, Jefferson, Pawnee, Thayer115 min

Nearby

Mesoscale Discussions in Nebraska, 2016Mesoscale Discussions in Iowa, 2016Mesoscale Discussions in Missouri, 2016Every mesoscale discussion in 2016

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.