Alert archive / Texas / Mesoscale Discussions in 2012
Mesoscale Discussion 989
The Storm Prediction Center issued this mesoscale discussion at May 30, 2012, 8:38 PM CDT for Beaver County, Oklahoma; 19 counties in Texas. It was in force for 97 min.
The area
The outline as issued.
The facts
- Issued
- May 30, 2012, 8:38 PM CDT (01:38 UTC)
- Expired
- May 30, 2012, 10:15 PM CDT
- In force
- 97 min
- Issued by
- the Storm Prediction Center
Counties Beaver County, OK, Armstrong County, TX, Briscoe County, TX, Carson County, TX, Childress County, TX, Collingsworth County, TX, Cottle County, TX, Donley County, TX, Floyd County, TX, Gray County, TX, Hall County, TX, Hansford County, TX, Hemphill County, TX, Hutchinson County, TX, Lipscomb County, TX, Motley County, TX, Ochiltree County, TX, Roberts County, TX, Swisher County, TX, Wheeler County, TX
The radar
The Amarillo radar (KAMA), 68 km from the middle of the area, began a volume at 01:42 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 nearest sounding before it
Amarillo Airport, TX (KAMA), launched 00:00Z, 1.6 hours before the alert went out and 67 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
- 236 J/kg
- Mixed-layer CIN
- -89 J/kg
- Mixed-layer LCL
- 3472 m above ground
- 0-6 km bulk shear
- 25 kt
- 0-1 km storm-relative helicity
- -11 m²/s²
- 0-3 km storm-relative helicity
- 11 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
296
ACUS11 KWNS 310139
SWOMCD
SPC MCD 310138
OKZ000-TXZ000-KSZ000-310315-
MESOSCALE DISCUSSION 0989
NWS STORM PREDICTION CENTER NORMAN OK
0838 PM CDT WED MAY 30 2012
AREAS AFFECTED...THE ERN OK AND TEXAS PANHANDLES AND ERN SOUTH
PLAINS
CONCERNING...TORNADO WATCH 322...
VALID 310138Z - 310315Z
THE SEVERE WEATHER THREAT FOR TORNADO WATCH 322 CONTINUES.
SUMMARY...THE TORNADO THREAT IS ENDING OVER MUCH OF THE
WATCH...EXCEPT FOR FAR SRN AREAS WHERE A SUPERCELL IS ONGOING.
HOWEVER...THE THREAT FOR ADDITIONAL SEVERE STORMS APPEARS LIKELY
OVER THE ERN OK PANHANDLE AND EVENTUALLY INTO THE ERN TX PANHANDLE
LATER THIS EVENING.
DISCUSSION...A STRONG SUPERCELL WILL EXIT THE TORNADO WATCH FROM
STONEWALL INTO HASKELL COUNTY NEAR THE EXPIRATION TIME. THIS WILL
END THE TORNADO THREAT FOR THE MOST PART...BUT ADDITIONAL STORMS ARE
CONGEALING OVER KS...AND THE WRN EDGE OF THESE STORMS AND COMPOSITE
OUTFLOW/COLD FRONT SHOULD BE ENOUGH TO PRODUCE MORE STORMS THIS
EVENING WITH WIND AND HAIL. THEREFORE...ANOTHER WATCH MAY EVENTUALLY
BE NEEDED.
..JEWELL/CORFIDI.. 05/31/2012
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...OUN...DDC...LUB...AMA...
LAT...LON 36920126 37110000 36529988 34269993 33990026 33880094
34000150 34380178 35160183 35980173 36230169 36920126SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 30, 7:32 PM CDT | Severe Thunderstorm Watch | SPC | Adair, Cherokee, Craig, Creek, Delaware, Haskell and 17 more | 8 hr |
| May 30, 11:21 PM CDT | Mesoscale Discussion | SPC | Adair, Caddo, Canadian, Cherokee, Cleveland, Craig and 20 more | 114 min |
| May 31, 1:52 AM CDT | Mesoscale Discussion | SPC | Adair, Haskell, Sequoyah | 83 min |
| May 30, 7:37 PM CDT | Mesoscale Discussion | SPC | Blanco, Brown, Burnet, Callahan, Coleman, Comanche and 22 more | 113 min |
| May 30, 10:15 PM CDT | Mesoscale Discussion | SPC | Blanco, Brown, Burnet, Callahan, Coleman, Comanche and 22 more | 2 hr |
| May 31, 6:02 AM CDT | Mesoscale Discussion | SPC | Brazos, Falls, Freestone, Houston, Leon, Limestone and 5 more | 88 min |
| May 31, 9:47 AM CDT | Mesoscale Discussion | SPC | Chambers, Hardin, Harris, Jasper, Jefferson, Liberty and 5 more | 58 min |
| May 31, 10:41 AM CDT | Severe Thunderstorm Watch | SPC | Hardin, Jasper, Jefferson, Newton, Orange | 6 hr |
| May 31, 6:21 PM CDT | Mesoscale Discussion | SPC | Brewster, Jeff Davis, Pecos, Presidio, Reeves | 2 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.