Alert archive / Nebraska / Mesoscale Discussions in 2015

Mesoscale Discussion 769

May 25, 20154 states

The Storm Prediction Center issued this mesoscale discussion at May 25, 2015, 5:08 PM CDT for 4 states. It was in force for 67 min.

The area

The outline as issued.

The facts

Issued
May 25, 2015, 5:08 PM CDT (22:08 UTC)
Expired
May 25, 2015, 6:15 PM CDT
In force
67 min
Issued by
the Storm Prediction Center
Chance of a watch
80%
All 69 counties

Adair County, IA, Adams County, IA, Audubon County, IA, Calhoun County, IA, Carroll County, IA, Cass County, IA, Crawford County, IA, Dallas County, IA, Fremont County, IA, Greene County, IA, Guthrie County, IA, Harrison County, IA, Ida County, IA, Mills County, IA, Monona County, IA, Montgomery County, IA, Page County, IA, Pottawattamie County, IA, Ringgold County, IA, Sac County, IA, Shelby County, IA, Taylor County, IA, Union County, IA, Woodbury County, IA, Atchison County, KS, Brown County, KS, Doniphan County, KS, Marshall County, KS, Nemaha County, KS, Andrew County, MO, Atchison County, MO, Buchanan County, MO, Clinton County, MO, DeKalb County, MO, Gentry County, MO, Holt County, MO, Nodaway County, MO, Platte County, MO, Worth County, MO, Burt County, NE, Butler County, NE, Cass County, NE, Colfax County, NE, Cuming County, NE, Dakota County, NE, Dixon County, NE, Dodge County, NE, Douglas County, NE, Fillmore County, NE, Gage County, NE, Jefferson County, NE, Johnson County, NE, Lancaster County, NE, Nemaha County, NE, Otoe County, NE, Pawnee County, NE, Platte County, NE, Polk County, NE, Richardson County, NE, Saline County, NE, Sarpy County, NE, Saunders County, NE, Seward County, NE, Stanton County, NE, Thayer County, NE, Thurston County, NE, Washington County, NE, Wayne County, NE, York County, NE

The radar

The Omaha radar (KOAX), 93 km from the middle of the area, began a volume at 22:09 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, 10.1 hours before the alert went out and 93 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 2015-05-25Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 232 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 12:00Z on 2015-05-25The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 28 square meters per square second.193958Sfc1 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
232 J/kg
Mixed-layer CIN
-69 J/kg
Mixed-layer LCL
810 m above ground
0-6 km bulk shear
26 kt
0-1 km storm-relative helicity
28 m²/s²
0-3 km storm-relative helicity
85 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.

IssuedProductOfficeCountiesLasted
May 25, 5:33 PM CDTSevere Thunderstorm WatchSPCAdair, Adams, Appanoose, Audubon, Black Hawk, Boone and 39 more6 hr
May 25, 6:06 PM CDTMesoscale DiscussionSPCAllamakee, Buena Vista, Cerro Gordo, Cherokee, Chickasaw, Clay and 17 more114 min
May 24, 7:05 PM CDTMesoscale DiscussionSPCCheyenne, Finney, Gove, Grant, Greeley, Hamilton and 12 more115 min
May 24, 9:16 PM CDTMesoscale DiscussionSPCFinney, Grant, Gray, Greeley, Hamilton, Haskell and 7 more89 min
May 24, 11:19 PM CDTMesoscale DiscussionSPCClark, Ford, Gray, Haskell, Hodgeman, Meade and 1 more56 min
May 25, 12:34 AM CDTMesoscale DiscussionSPCClark, Edwards, Ford, Kiowa, Meade56 min
May 25, 2:33 PM CDTMesoscale DiscussionSPCBarber, Barton, Butler, Chase, Chautauqua, Clay and 29 more57 min
May 25, 3:43 PM CDTSevere Thunderstorm WatchSPCBrown, Butler, Chase, Chautauqua, Clay, Cloud and 30 more5 hr
May 25, 6:39 PM CDTMesoscale DiscussionSPCButler, Chase, Chautauqua, Clay, Cloud, Cowley and 27 more96 min
May 24, 8:41 PM CDTMesoscale DiscussionSPCBollinger, Cape Girardeau, Dunklin, Jefferson, Madison, Mississippi and 9 more64 min
May 25, 6:57 PM CDTMesoscale DiscussionSPCBarry, Carter, Christian, Dent, Douglas, Greene and 14 more93 min

Nearby

Mesoscale Discussions in Nebraska, 2015Mesoscale Discussions in Iowa, 2015Mesoscale Discussions in Missouri, 2015Every mesoscale discussion in 2015

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.