Alert archive / Texas / Mesoscale Discussions in 2012
Mesoscale Discussion 1898
The Storm Prediction Center issued this mesoscale discussion at Sep 5, 2012, 6:53 PM CDT for 22 counties in Oklahoma; 32 counties in Texas. It was in force for 67 min.
The area
The outline as issued.
The facts
- Issued
- Sep 5, 2012, 6:53 PM CDT (23:53 UTC)
- Expired
- Sep 5, 2012, 8:00 PM CDT
- In force
- 67 min
- Issued by
- the Storm Prediction Center
All 54 counties
Alfalfa County, OK, Beaver County, OK, Beckham County, OK, Blaine County, OK, Caddo County, OK, Canadian County, OK, Custer County, OK, Dewey County, OK, Ellis County, OK, Garfield County, OK, Grant County, OK, Greer County, OK, Harmon County, OK, Harper County, OK, Jackson County, OK, Kingfisher County, OK, Kiowa County, OK, Major County, OK, Roger Mills County, OK, Washita County, OK, Woods County, OK, Woodward County, OK, Armstrong County, TX, Bailey County, TX, Briscoe County, TX, Carson County, TX, Castro County, TX, Childress County, TX, Collingsworth County, TX, Cottle County, TX, Deaf Smith County, TX, Donley County, TX, Floyd County, TX, Gray County, TX, Hale County, TX, Hall County, TX, Hansford County, TX, Hardeman County, TX, Hartley County, TX, Hemphill County, TX, Hutchinson County, TX, Lamb County, TX, Lipscomb County, TX, Moore County, TX, Motley County, TX, Ochiltree County, TX, Oldham County, TX, Parmer County, TX, Potter County, TX, Randall County, TX, Roberts County, TX, Sherman County, TX, Swisher County, TX, Wheeler County, TX
The radar
The Amarillo radar (KAMA), 96 km from the middle of the area, began a volume at 23:53 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
Amarillo Airport, TX (KAMA), launched 12:00Z, 11.9 hours before the alert went out and 95 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
- 1415 J/kg
- Mixed-layer CIN
- -182 J/kg
- Mixed-layer LCL
- 1651 m above ground
- 0-6 km bulk shear
- 18 kt
- 0-1 km storm-relative helicity
- 49 m²/s²
- 0-3 km storm-relative helicity
- 66 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.5
The text
As transmitted, in the capitals the NWS used until 2016.
251
ACUS11 KWNS 052353
SWOMCD
SPC MCD 052353
OKZ000-TXZ000-NMZ000-060100-
MESOSCALE DISCUSSION 1898
NWS STORM PREDICTION CENTER NORMAN OK
0653 PM CDT WED SEP 05 2012
AREAS AFFECTED...TX PANHANDLE INTO WRN OK/NW TX
CONCERNING...SEVERE THUNDERSTORM WATCH 622...623...
VALID 052353Z - 060100Z
THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH
622...623...CONTINUES.
SUMMARY...SEVERE WIND/HAIL THREAT WILL REMAIN LIMITED THROUGH THE
REMAINDER OF THE EVENING. STORM CLUSTERS ARE EXPECTED TO REMAIN
RATHER UNORGANIZED WITH ONLY BRIEF UPTICK IN STORM INTENSITY. SLOW
STORM MOTION WILL ALSO LEAD TO A THREAT OF HEAVY DOWNPOURS.
DISCUSSION...STORM CLUSTERS HAVE GENERALLY DECREASED IN INTENSITY
OVER THE LAST HOUR OR SO EXCEPT IN THE VICINITY OF I-40 IN THE TX
PANHANDLE. HERE...CONVERGENCE ALONG A WEAK FRONTAL BOUNDARY COUPLED
WITH SLIGHTLY INCREASING BULK SHEAR VALUES ARE LIKELY HELPING TO
GENERATE/SUSTAIN STRONGER UPDRAFTS. IT IS UNCLEAR HOW PERSISTENT
THIS AREA OF MORE ROBUST CONVECTION MAY BE DUE TO WEAK INSTABILITY.
EITHER WAY...STORMS WILL LIKELY CONTINUE ACROSS WW 622 AND 623 THE
NEXT FEW HOURS WITH SEVERE WIND/HAIL THREAT CONTINUING TO BE RATHER
SPORADIC THROUGH THE REMAINDER OF THE EVENING. THE LACK OF
ORGANIZATION AND AMORPHOUS/SLOW STORM MOTION WILL ALSO BRING A
THREAT OF HEAVY DOWNPOURS.
..LEITMAN.. 09/05/2012
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...OUN...LUB...AMA...ABQ...
LAT...LON 33830303 36020300 36989997 36989772 35549773 33840008
33830303SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 5, 2:49 PM CDT | Mesoscale Discussion | SPC | Beckham, Custer, Dewey, Ellis, Greer, Harmon and 7 more | 56 min |
| Sep 5, 3:19 PM CDT | Severe Thunderstorm Watch | SPC | Beaver, Texas | 8 hr |
| Sep 5, 3:56 PM CDT | Severe Thunderstorm Watch | SPC | Alfalfa, Blaine, Custer, Dewey, Ellis, Garfield and 7 more | 7 hr |
Nearby
Mesoscale Discussions in Texas, 2012Mesoscale Discussions in Oklahoma, 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.