Alert archive / Texas / Mesoscale Discussions in 2012
Mesoscale Discussion 863
The Storm Prediction Center issued this mesoscale discussion at May 21, 2012, 9:33 PM CDT for 9 counties in Texas. It was in force for 87 min.
The area
The outline as issued.
The facts
- Issued
- May 21, 2012, 9:33 PM CDT (02:33 UTC)
- Expired
- May 21, 2012, 11:00 PM CDT
- In force
- 87 min
- Issued by
- the Storm Prediction Center
Counties Bailey County, TX, Castro County, TX, Cochran County, TX, Hale County, TX, Hockley County, TX, Lamb County, TX, Parmer County, TX, Randall County, TX, Swisher County, TX
The radar
The Lubbock radar (KLBB), 99 km from the middle of the area, began a volume at 02:34 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, 2.6 hours before the alert went out and 123 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
- 118 J/kg
- Mixed-layer CIN
- -79 J/kg
- Mixed-layer LCL
- 2075 m above ground
- 0-6 km bulk shear
- 41 kt
- 0-1 km storm-relative helicity
- 24 m²/s²
- 0-3 km storm-relative helicity
- 231 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
The text
As transmitted, in the capitals the NWS used until 2016.
960
ACUS11 KWNS 220233
SWOMCD
SPC MCD 220233
TXZ000-NMZ000-220400-
MESOSCALE DISCUSSION 0863
NWS STORM PREDICTION CENTER NORMAN OK
0933 PM CDT MON MAY 21 2012
AREAS AFFECTED...PARTS OF E CNTRL NEW MEXICO AND THE WRN TEXAS
PANHANDLE
CONCERNING...SEVERE THUNDERSTORM WATCH 287...
VALID 220233Z - 220400Z
THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 287
CONTINUES.
SUMMARY...IT STILL APPEARS THAT A NEW WW WILL NOT BE NEEDED...BUT IT
IS NOT OUT OF THE QUESTION THAT AN HOUR OR SO LOCAL EXTENSION IN
TIME MAY BECOME NECESSARY...PERHAPS WITH AN ADDITIONAL ROW OR TWO OF
COUNTIES ADDED TO THE WATCH...BOTH EAST SOUTHEAST OF AMARILLO ...AND
PERHAPS INCLUDING THE LUBBOCK AREA.
DISCUSSION...VIGOROUS CONVECTIVE DEVELOPMENT PERSISTS ON THE LEADING
EDGE OF THE SIGNIFICANT CONSOLIDATED COLD POOL NOW SPREADING INTO
THE TEXAS PANHANDLE...WEST/SOUTHWEST OF AMARILLO. THE COLD POOL MAY
TEND TO SURGE MORE SOUTH THAN EAST BETWEEN NOW AND 03-04Z...BUT
COULD STILL IMPACT THE AMARILLO AREA. SOUTH SOUTHEASTERLY NEAR
SURFACE SYSTEM RELATIVE INFLOW IS RATHER MODEST...AND INGESTION OF
MORE STABLE AIR STILL SEEMS LIKELY TO BEGIN TO WEAKEN ACTIVITY AND
DIMINISH THE SEVERE POTENTIAL WITHIN THE NEXT COUPLE OF HOURS.
..KERR.. 05/22/2012
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...LUB...AMA...MAF...ABQ...
LAT...LON 34370340 34690253 35370196 34760109 33500207 33300308
34370340SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 21, 7:40 PM CDT | Mesoscale Discussion | SPC | Bailey, Castro, Deaf Smith, Hartley, Lamb, Oldham and 3 more | 95 min |
| May 22, 2:06 PM CDT | Mesoscale Discussion | SPC | Dallam, Hansford, Hartley, Hutchinson, Moore, Ochiltree and 3 more | 84 min |
| May 22, 5:10 PM CDT | Mesoscale Discussion | SPC | Brewster | 65 min |
Nearby
Mesoscale Discussions in Texas, 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.