Alert archive / Nebraska / Mesoscale Discussions in 2012
Mesoscale Discussion 885
The Storm Prediction Center issued this mesoscale discussion at May 23, 2012, 8:56 PM CDT for 29 counties in Iowa; 37 counties in Nebraska; Lincoln County, Union County, South Dakota. It was in force for 94 min.
The area
The outline as issued.
The facts
- Issued
- May 23, 2012, 8:56 PM CDT (01:56 UTC)
- Expired
- May 23, 2012, 10:30 PM CDT
- In force
- 94 min
- Issued by
- the Storm Prediction Center
All 68 counties
Audubon County, IA, Buena Vista County, IA, Calhoun County, IA, Carroll County, IA, Cass County, IA, Cherokee County, IA, Clay County, IA, Crawford County, IA, Dickinson County, IA, Emmet County, IA, Fremont County, IA, Harrison County, IA, Humboldt County, IA, Ida County, IA, Kossuth County, IA, Lyon County, IA, Mills County, IA, Monona County, IA, Montgomery County, IA, O'Brien County, IA, Osceola County, IA, Palo Alto County, IA, Plymouth County, IA, Pocahontas County, IA, Pottawattamie County, IA, Sac County, IA, Shelby County, IA, Sioux County, IA, Woodbury County, IA, Adams County, NE, Burt County, NE, Butler County, NE, Cass County, NE, Clay 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, Hamilton County, NE, Jefferson County, NE, Johnson County, NE, Lancaster County, NE, Madison County, NE, Merrick County, NE, Nance County, NE, Nemaha County, NE, Nuckolls 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, Stanton County, NE, Thayer County, NE, Thurston County, NE, Washington County, NE, Wayne County, NE, Webster County, NE, York County, NE, Lincoln County, SD, Union County, SD
The radar
The Omaha radar (KOAX), 121 km from the middle of the area, began a volume at 01:59 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 00:00Z, 1.9 hours before the alert went out and 121 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.
- Mixed-layer CAPE
- 1035 J/kg
- Mixed-layer CIN
- -46 J/kg
- Mixed-layer LCL
- 2387 m above ground
- 0-6 km bulk shear
- 36 kt
- 0-1 km storm-relative helicity
- 195 m²/s²
- 0-3 km storm-relative helicity
- 291 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 4.7
The text
As transmitted, in the capitals the NWS used until 2016.
181
ACUS11 KWNS 240156
SWOMCD
SPC MCD 240156
MNZ000-IAZ000-MOZ000-NEZ000-SDZ000-240330-
MESOSCALE DISCUSSION 0885
NWS STORM PREDICTION CENTER NORMAN OK
0856 PM CDT WED MAY 23 2012
AREAS AFFECTED...ERN NEB/WRN IA/FAR SERN SD
CONCERNING...SEVERE THUNDERSTORM WATCH 293...
VALID 240156Z - 240330Z
THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 293
CONTINUES.
SUMMARY...ISOLATED SEVERE THREAT CONTINUES.
DISCUSSION...LATEST RADAR LOOP SHOWS THE BROKEN BAND OF
STRONG/ISOLATED SEVERE STORMS MOVING ACROSS SERN NEB/WRN IA
ATTM...JUST AHEAD OF THE ADVANCING COLD FRONT. MEANWHILE...ELEVATED
STORMS CONTINUE TO INCREASE JUST W OF THE WATCH ACROSS NERN NEB...TO
THE COOL SIDE OF THE SURFACE FRONT AS A SLY LOW-LEVEL JET INCREASES
/NOW 55 KT PER VWP/PROFILER DATA/. THE BOUNDARY LAYER CONTINUES TO
COOL AHEAD OF THE CONVECTION...WITH SURFACE TEMPERATURES NOW 5-6
DEGREES F COOLER OVER THE PAST TWO HOURS. WITH FURTHER
COOLING...WIND THREAT WILL CONTINUE TO SLOWLY DIMINISH.
MEANWHILE...POTENTIAL FOR ISOLATED/MARGINALLY SEVERE HAIL -- BOTH
WITH THE PRE-FRONTAL BAND OF STORMS AND WITH CONVECTION INCREASING
IN THE COOLER AIRMASS BEHIND THE FRONT -- WILL CONTINUE.
..GOSS.. 05/24/2012
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...MPX...DMX...EAX...FSD...OAX...GID...
LAT...LON 43579421 43179400 41489477 40009594 40169890 43469660
43579421SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 24, 6:33 AM CDT | Mesoscale Discussion | SPC | Allamakee, Black Hawk, Bremer, Buchanan, Chickasaw, Clayton and 8 more | 57 min |
| May 24, 1:34 PM CDT | Mesoscale Discussion | SPC | Allamakee, Black Hawk, Bremer, Butler, Cerro Gordo, Chickasaw and 10 more | 116 min |
| May 24, 3:06 PM CDT | Mesoscale Discussion | SPC | Allamakee, Appanoose, Benton, Black Hawk, Bremer, Buchanan and 38 more | 114 min |
| May 24, 3:30 PM CDT | Severe Thunderstorm Watch | SPC | Allamakee, Appanoose, Benton, Black Hawk, Bremer, Buchanan and 39 more | 4 hr |
| May 24, 5:42 PM CDT | Mesoscale Discussion | SPC | Allamakee, Appanoose, Benton, Black Hawk, Buchanan, Cedar and 24 more | 2 hr |
| May 23, 10:29 PM CDT | Mesoscale Discussion | SPC | Adams, Antelope, Boone, Buffalo, Butler, Cedar and 38 more | 91 min |
| May 23, 10:47 PM CDT | Severe Thunderstorm Watch | SPC | Adams, Antelope, Boone, Buffalo, Burt, Butler and 37 more | 6 hr |
Nearby
Mesoscale Discussions in Nebraska, 2012Mesoscale Discussions in Iowa, 2012Mesoscale Discussions in South Dakota, 2012Every mesoscale discussion in 2012
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.