Alert archive / Nebraska / Mesoscale Discussions in 2012
Mesoscale Discussion 534
The Storm Prediction Center issued this mesoscale discussion at Apr 14, 2012, 6:57 PM CDT for 29 counties in Iowa; 15 counties in Missouri; 32 counties in Nebraska. It was in force for 63 min.
The area
The outline as issued.
The facts
- Issued
- Apr 14, 2012, 6:57 PM CDT (23:57 UTC)
- Expired
- Apr 14, 2012, 8:00 PM CDT
- In force
- 63 min
- Issued by
- the Storm Prediction Center
All 76 counties
Adair County, IA, Adams County, IA, Appanoose County, IA, Audubon County, IA, Cass County, IA, Clarke County, IA, Dallas County, IA, Davis County, IA, Decatur County, IA, Fremont County, IA, Guthrie County, IA, Jasper County, IA, Lucas County, IA, Madison County, IA, Mahaska County, IA, Marion County, IA, Mills County, IA, Monroe County, IA, Montgomery County, IA, Page County, IA, Polk County, IA, Pottawattamie County, IA, Poweshiek County, IA, Ringgold County, IA, Taylor County, IA, Union County, IA, Wapello County, IA, Warren County, IA, Wayne County, IA, Adair County, MO, Andrew County, MO, Atchison County, MO, Daviess County, MO, DeKalb County, MO, Gentry County, MO, Grundy County, MO, Harrison County, MO, Holt County, MO, Mercer County, MO, Nodaway County, MO, Putnam County, MO, Schuyler County, MO, Sullivan County, MO, Worth County, MO, Adams County, NE, Buffalo County, NE, Butler County, NE, Cass County, NE, Clay County, NE, Douglas County, NE, Fillmore County, NE, Gage 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, Polk County, NE, Richardson County, NE, Saline County, NE, Sarpy County, NE, Saunders County, NE, Seward County, NE, Sherman County, NE, Thayer County, NE, Washington County, NE, York County, NE
The radar
The Omaha radar (KOAX), 92 km from the middle of the area, began a volume at 23:57 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, 12.0 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.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1847 m above ground
- 0-6 km bulk shear
- 38 kt
- 0-1 km storm-relative helicity
- 2 m²/s²
- 0-3 km storm-relative helicity
- 89 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
858
ACUS11 KWNS 142358
SWOMCD
SPC MCD 142357
IAZ000-MOZ000-KSZ000-NEZ000-150100-
MESOSCALE DISCUSSION 0534
NWS STORM PREDICTION CENTER NORMAN OK
0657 PM CDT SAT APR 14 2012
AREAS AFFECTED...SERN NEB...SRN IA...NRN MO...NERN KS
CONCERNING...TORNADO WATCH 167...169...171...
VALID 142357Z - 150100Z
THE SEVERE WEATHER THREAT FOR TORNADO WATCH
167...169...171...CONTINUES.
A NEW WW HAS BEEN ISSUED FOR PORTIONS OF SERN NEB FOR POTENTIAL NEW
DEVELOPMENT AND ONGOING CONVECTION TO THE WEST OF AN EXITING MCS.
INTENSIFICATION OF STORMS REMAINS POSSIBLE ACROSS SRN IA...AND NRN
MO...ESPECIALLY IN ADVANCE OF A BOWING SEGMENT OVER SWRN IA.
23Z SURFACE ANALYSIS REFLECTS A DEEPENING SURFACE LOW OVER NWRN
KS/SWRN NEB...WITH SURFACE PRESSURE FALLS NOTED OVER NERN NEB/NWRN
IA IN RESPONSE TO HEIGHT FALLS ALOFT / A VORT MAX NOTED ON WV
IMAGERY OVER SERN WY/NERN CO. WITH A SURFACE LOW DEVELOPING INTO
NERN NEB...NOTABLE BACKING IS PROJECTED ACROSS FAR ERN NEB AND IA.
AREA VAD WIND PROFILE DATA IS ALREADY SHOWING SIGNIFICANT
STRENGTHENING OF LOW LEVEL WINDS.../50 KT AT 1000 FT ACROSS NERN
KS/NWRN MO...WITH HODOGRAPHS LARGELY BECOMING FAVORABLE FOR
SUPERCELLS CAPABLE OF DMGG WINDS...LARGE HAIL...AND POTENTIALLY
SIGNIFICANT TORNADOES. WARM ADVECTION REGIME WILL CONTINUE TO
SUPPORT A DESTABILIZING/RECOVERING AIR MASS...WITH NEW DEVELOPMENT
OF STORMS POSSIBLE.
..HURLBUT.. 04/14/2012
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...DVN...DMX...EAX...OAX...TOP...GID...LBF...
LAT...LON 41909263 40839201 40019264 39869433 39799516 40039728
40289884 40609973 41289942 41559649 41749474 41909263SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 14, 12:00 PM CDT | Tornado Watch | SPC | Fremont, Harrison, Mills, Monona, Montgomery, Page and 2 more | 7 hr |
| Apr 14, 2:15 PM CDT | Mesoscale Discussion | SPC | Adams, Audubon, Cass, Fremont, Harrison, Mills and 5 more | 90 min |
| Apr 14, 2:56 PM CDT | Tornado Watch | SPC | Adair, Adams, Appanoose, Audubon, Cass, Clarke and 14 more | 2 hr |
| Apr 14, 4:47 PM CDT | Mesoscale Discussion | SPC | Adair, Adams, Appanoose, Cass, Clarke, Dallas and 17 more | 58 min |
| Apr 14, 5:00 PM CDT | Tornado Watch | SPC | Adair, Adams, Appanoose, Audubon, Cass, Clarke and 18 more | 7 hr |
| Apr 13, 7:34 PM CDT | Mesoscale Discussion | SPC | Barry, Benton, Camden, Cedar, Christian, Cole and 29 more | 116 min |
| Apr 13, 9:14 PM CDT | Mesoscale Discussion | SPC | Bates, Vernon | 61 min |
| Apr 14, 10:43 AM CDT | Tornado Watch | SPC | Hitchcock, Red Willow | 7 hr |
| Apr 14, 11:27 AM CDT | Mesoscale Discussion | SPC | Adams, Buffalo, Clay, Fillmore, Franklin, Furnas and 19 more | 2 hr |
| Apr 14, 1:41 PM CDT | Mesoscale Discussion | SPC | Arthur, Custer, Dawson, Frontier, Garden, Grant and 9 more | 2 hr |
| Apr 14, 2:33 PM CDT | Tornado Watch | SPC | Blaine, Custer, Frontier, Garfield, Hayes, Holt and 7 more | 8 hr |
| Apr 14, 5:24 PM CDT | Tornado Watch | SPC | Hitchcock, Red Willow | 9 hr |
| Apr 14, 6:27 PM CDT | Tornado Watch | SPC | Adams, Buffalo, Cass, Clay, Dawson, Fillmore and 30 more | 9 hr |
Nearby
Mesoscale Discussions in Nebraska, 2012Mesoscale Discussions in Iowa, 2012Mesoscale Discussions in Missouri, 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.