Alert archive / Nebraska / Mesoscale Discussions in 2013

Mesoscale Discussion 890

May 30, 201312 counties in Iowa; Atchison County, Missouri; 13 counties in Nebraska

The Storm Prediction Center issued this mesoscale discussion at May 30, 2013, 7:41 PM CDT for 12 counties in Iowa; Atchison County, Missouri; 13 counties in Nebraska. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
May 30, 2013, 7:41 PM CDT (00:41 UTC)
Expired
May 30, 2013, 9:45 PM CDT
In force
2 hr
Issued by
the Storm Prediction Center
Chance of a watch
20%
All 26 counties

Cass County, IA, Crawford County, IA, Fremont County, IA, Harrison County, IA, Ida County, IA, Mills County, IA, Monona County, IA, Montgomery County, IA, Page County, IA, Pottawattamie County, IA, Shelby County, IA, Woodbury County, IA, Atchison County, MO, Burt County, NE, Cass County, NE, Dodge County, NE, Douglas County, NE, Johnson County, NE, Lancaster County, NE, Nemaha County, NE, Otoe County, NE, Pawnee County, NE, Richardson County, NE, Sarpy County, NE, Saunders County, NE, Washington County, NE

The radar

The Omaha radar (KOAX), 47 km from the middle of the area, began a volume at 00:41 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

Omaha, NE (KOAX), launched 00:00Z, 0.7 hours before the alert went out and 47 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 00:00Z on 2013-05-31Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1344 joules per kilogram.LCLLFCEL10008507005003002001001 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 00:00Z on 2013-05-31The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 64 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
1344 J/kg
Mixed-layer CIN
-5 J/kg
Mixed-layer LCL
1129 m above ground
0-6 km bulk shear
28 kt
0-1 km storm-relative helicity
64 m²/s²
0-3 km storm-relative helicity
79 m²/s²
Significant tornado parameter
0.0
Supercell composite
2.4

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.

IssuedProductOfficeCountiesLasted
May 31, 2:35 PM CDTSevere Thunderstorm WatchSPCAllamakee, Chickasaw, Clayton, Fayette, Floyd, Howard and 2 more9 hr
May 30, 7:04 PM CDTMesoscale DiscussionSPCPerry, City of Saint Louis56 min
May 30, 8:46 PM CDTTornado WatchSPCDunklin, Pemiscot7 hr
May 31, 1:57 AM CDTMesoscale DiscussionSPCButler, Carter, Oregon, Ripley93 min
May 31, 2:05 AM CDTMesoscale DiscussionSPCBuchanan, Clay, Clinton, Jackson, Platte, Ray85 min
May 31, 2:44 AM CDTSevere Thunderstorm WatchSPCBuchanan, Caldwell, Carroll, Cass, Chariton, Clay and 14 more5 hr
May 31, 4:51 AM CDTMesoscale DiscussionSPCCaldwell, Carroll, Cass, Chariton, Clay, Clinton and 11 more114 min
May 31, 7:03 AM CDTMesoscale DiscussionSPCCass, Cooper, Howard, Johnson, Pettis57 min
May 31, 8:45 AM CDTMesoscale DiscussionSPCCallaway, Camden, Cole, Crawford, Dent, Franklin and 18 more90 min
May 31, 1:49 PM CDTMesoscale DiscussionSPCBarry, Barton, Bates, Benton, Camden, Cass and 29 more116 min
May 31, 2:15 PM CDTTornado WatchSPCBarry, Barton, Bates, Benton, Boone, Callaway and 30 more8 hr
May 31, 5:21 PM CDTMesoscale DiscussionSPCFranklin, Lincoln, Montgomery, Pike, Saint Charles, Saint Louis and 1 more54 min
May 31, 5:45 PM CDTTornado WatchSPCAudrain, Crawford, Franklin, Gasconade, Jefferson, Lincoln and 9 more4 hr

Nearby

Mesoscale Discussions in Nebraska, 2013Mesoscale Discussions in Iowa, 2013Mesoscale Discussions in Missouri, 2013Every mesoscale discussion in 2013

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.