Alert archive / Nebraska / Mesoscale Discussions in 2012
Mesoscale Discussion 526
The Storm Prediction Center issued this mesoscale discussion at Apr 14, 2012, 1:41 PM CDT for Decatur County, Rawlins County, Kansas; 15 counties in Nebraska. It was in force for 2 hr.
The area
The outline as issued.
The facts
- Issued
- Apr 14, 2012, 1:41 PM CDT (18:41 UTC)
- Expired
- Apr 14, 2012, 3:45 PM CDT
- In force
- 2 hr
- Issued by
- the Storm Prediction Center
Counties Decatur County, KS, Rawlins County, KS, Arthur County, NE, Custer County, NE, Dawson County, NE, Frontier County, NE, Garden County, NE, Grant County, NE, Hayes County, NE, Hitchcock County, NE, Hooker County, NE, Keith County, NE, Lincoln County, NE, Logan County, NE, McPherson County, NE, Perkins County, NE, Red Willow County, NE
The radar
The North Platte radar (KLNX), 150 km from the middle of the area, began a volume at 18:42 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
N. Platte/Lee Bi, NE (KLBF), launched 12:00Z, 6.7 hours before the alert went out and 63 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
- 1610 m above ground
- 0-6 km bulk shear
- 69 kt
- 0-1 km storm-relative helicity
- 192 m²/s²
- 0-3 km storm-relative helicity
- 202 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
143
ACUS11 KWNS 141841
SWOMCD
SPC MCD 141841
NEZ000-KSZ000-COZ000-142045-
MESOSCALE DISCUSSION 0526
NWS STORM PREDICTION CENTER NORMAN OK
0141 PM CDT SAT APR 14 2012
AREAS AFFECTED...SWRN NEB THROUGH NWRN KS
CONCERNING...SEVERE POTENTIAL...WATCH LIKELY
VALID 141841Z - 142045Z
STORMS ARE EXPECTED TO DEVELOP FROM SWRN NEB THROUGH NWRN KS BY MID
TO LATE THIS AFTERNOON. SUPERCELLS WITH TORNADOES AND VERY LARGE
HAIL ARE EXPECTED TO BE THE MAIN THREATS. TORNADO WATCH WILL BE
NEEDED BEFORE 20Z.
THIS AFTERNOON A WARM FRONT EXTENDS THROUGH SRN NEB INTO SWRN NEB
WHERE IT INTERSECTS A DRYLINE THAT ARCS SEWD THROUGH THE NERN TIP OF
CO THEN SWD THROUGH WRN KS. LOW CLOUDS ARE DECREASING FROM THE SOUTH
AS BOUNDARY LAYER MIXING DEVELOPS NWD. THIS IS CONTRIBUTING TO
DESTABILIZATION IN WARM SECTOR. LATEST OBJECTIVE ANALYSIS SHOWS AN
AXIS OF 500-1000 J/KG MLCAPE FROM SWRN NEB INTO NWRN KS...AND
INSTABILITY WILL INCREASE FURTHER AS DIABATIC WARMING CONTINUES.
BANDS OF HIGH LEVEL CIRRUS HAVE BEEN INCREASING ACROSS NERN CO INTO
WRN NEB...AND THIS MAY BE INDICATIVE OF AGEOSTROPHIC FORCING WITHIN
UPPER JET EXIT REGION THAT WILL BEGIN TO OVERTAKE THE DRYLINE THIS
AFTERNOON. LATEST VISIBLE IMAGERY SHOWS AN AREA OF CUMULUS
INCREASING IN VICINITY OF THE DRYLINE OVER WCNTRL KS. AS THE CAP
WEAKENS AND THE BOUNDARY LAYER CONTINUES TO DESTABILIZE...STORMS ARE
EXPECTED TO INITIATE FROM NWRN KS THROUGH SWRN NEB. EFFECTIVE DEEP
SHEAR OF 50+ KT WILL SUPPORT SUPERCELLS WITH VERY LARGE HAIL AND
TORNADOES LIKELY.
..DIAL.. 04/14/2012
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...GID...LBF...GLD...BOU...CYS...
LAT...LON 39180089 39500107 40510161 41230227 41570271 41900236
41950096 41539947 41169938 40669997 39400035 39180089SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 13, 9:14 PM CDT | Mesoscale Discussion | SPC | Allen, Anderson, Bourbon, Butler, Chase, Chautauqua and 17 more | 61 min |
| Apr 14, 3:42 AM CDT | Tornado Watch | SPC | Chautauqua, Labette, Montgomery | 5 hr |
| Apr 14, 7:11 AM CDT | Mesoscale Discussion | SPC | Cherokee, Labette | 64 min |
| Apr 14, 9:42 AM CDT | Mesoscale Discussion | SPC | Clark, Finney, Ford, Gove, Grant, Gray and 10 more | 93 min |
| Apr 14, 10:43 AM CDT | Tornado Watch | SPC | Barber, Barton, Clark, Clay, Cloud, Comanche and 42 more | 7 hr |
| Apr 14, 11:44 AM CDT | Mesoscale Discussion | SPC | Barber, Barton, Clark, Clay, Cloud, Comanche and 40 more | 61 min |
| Apr 14, 12:11 PM CDT | Mesoscale Discussion | SPC | Butler, Chase, Chautauqua, Coffey, Cowley, Dickinson and 19 more | 64 min |
| Apr 14, 1:44 PM CDT | Mesoscale Discussion | SPC | Barton, Clark, Cloud, Edwards, Ellis, Ellsworth and 20 more | 61 min |
| Apr 14, 2:28 PM CDT | Mesoscale Discussion | SPC | Clay, Cloud, Jewell, Lincoln, Mitchell, Ottawa and 2 more | 32 min |
| Apr 14, 3:01 PM CDT | Mesoscale Discussion | SPC | Barber, Barton, Clark, Comanche, Edwards, Ellsworth and 10 more | 29 min |
| Apr 14, 3:48 PM CDT | Mesoscale Discussion | SPC | Barber, Barton, Clark, Clay, Cloud, Comanche and 33 more | 57 min |
| Apr 14, 4:47 PM CDT | Mesoscale Discussion | SPC | Atchison, Brown, Doniphan, Nemaha | 58 min |
| Apr 14, 4:54 PM CDT | Mesoscale Discussion | SPC | Barber, Barton, Clay, Cloud, Comanche, Dickinson and 32 more | 66 min |
| Apr 14, 5:00 PM CDT | Tornado Watch | SPC | Doniphan | 7 hr |
| Apr 14, 5:24 PM CDT | Tornado Watch | SPC | Barber, Barton, Brown, Butler, Chase, Chautauqua and 57 more | 9 hr |
| Apr 14, 11:27 AM CDT | Mesoscale Discussion | SPC | Adams, Buffalo, Clay, Fillmore, Franklin, Furnas and 19 more | 2 hr |
| Apr 14, 12:00 PM CDT | Tornado Watch | SPC | Adams, Antelope, Boone, Buffalo, Burt, Butler and 46 more | 7 hr |
| Apr 14, 2:15 PM CDT | Mesoscale Discussion | SPC | Adams, Burt, Butler, Cass, Clay, Colfax and 22 more | 90 min |
| Apr 14, 2:33 PM CDT | Tornado Watch | SPC | Blaine, Custer, Frontier, Garfield, Hayes, Holt and 7 more | 8 hr |
| Apr 14, 6:27 PM CDT | Tornado Watch | SPC | Adams, Buffalo, Cass, Clay, Dawson, Fillmore and 30 more | 9 hr |
| Apr 14, 6:57 PM CDT | Mesoscale Discussion | SPC | Adams, Buffalo, Butler, Cass, Clay, Douglas and 26 more | 63 min |
Nearby
Mesoscale Discussions in Nebraska, 2012Mesoscale Discussions in Kansas, 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.