Alert archive / Texas / Mesoscale Discussions in 2012
Mesoscale Discussion 809
The Storm Prediction Center issued this mesoscale discussion at May 14, 2012, 1:55 PM CDT for 15 counties in Texas. It was in force for 3 hr.
The area
The outline as issued.
The facts
- Issued
- May 14, 2012, 1:55 PM CDT (18:55 UTC)
- Expired
- May 14, 2012, 4:30 PM CDT
- In force
- 3 hr
- Issued by
- the Storm Prediction Center
- Chance of a watch
- 40%
Counties Brewster County, TX, Concho County, TX, Crockett County, TX, Edwards County, TX, Irion County, TX, Jeff Davis County, TX, Menard County, TX, Pecos County, TX, Presidio County, TX, Reagan County, TX, Schleicher County, TX, Sutton County, TX, Terrell County, TX, Tom Green County, TX, Val Verde County, TX
The radar
The Midland/Odessa radar (KMAF), 190 km from the middle of the area, began a volume at 18:58 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
Midland Regional, TX (KMAF), launched 12:00Z, 6.9 hours before the alert went out and 190 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
- 40 J/kg
- Mixed-layer CIN
- -330 J/kg
- Mixed-layer LCL
- 1130 m above ground
- 0-6 km bulk shear
- 56 kt
- 0-1 km storm-relative helicity
- 3 m²/s²
- 0-3 km storm-relative helicity
- -5 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.0
The text
As transmitted, in the capitals the NWS used until 2016.
242
ACUS11 KWNS 141856
SWOMCD
SPC MCD 141855
TXZ000-142130-
MESOSCALE DISCUSSION 0809
NWS STORM PREDICTION CENTER NORMAN OK
0155 PM CDT MON MAY 14 2012
AREAS AFFECTED...SWRN TX
CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE
VALID 141855Z - 142130Z
PROBABILITY OF WATCH ISSUANCE...40 PERCENT
SUMMARY...STORMS ARE EXPECTED TO INTENSIFY LATER THIS
AFTERNOON...WITH LARGE HAIL AND A FEW STRONG WIND GUSTS LIKELY.
DISCUSSION...VISIBLE IMAGERY SHOWS HEATING OCCURRING AHEAD OF AN
OUTFLOW BOUNDARY N OF THE BIG BEND AREA. STORMS DO NOT APPEAR SEVERE
AT THIS TIME...BUT POCKETS OF DESTABILIZATION ALONG WITH COOLING
ALOFT WITH THE UPPER VORTICITY CENTER SHOULD ALLOW FOR AN INCREASE
IN COVERAGE...WITH SRN FRINGE OF ONGOING ACTIVITY INTENSIFYING.
40-50 KT DEEP LAYER SHEAR WILL PROVIDE LONG HODOGRAPHS WHICH WILL
FAVOR SUPERCELLS WITH LARGE HAIL. A FEW STORMS MAY BOW WITH A WIND
THREAT.
..JEWELL/HART.. 05/14/2012
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...EWX...SJT...MAF...EPZ...
LAT...LON 30240474 30810530 30780364 30920266 31310196 31790153
31760061 31379972 30549988 29600058 29270109 28940216
28890299 28990345 29390420 29720460 30240474SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 13, 9:14 PM CDT | Mesoscale Discussion | SPC | Culberson, Jeff Davis, Loving, Reeves, Ward | 61 min |
| May 13, 9:21 PM CDT | Severe Thunderstorm Watch | SPC | Brewster, Crane, Culberson, Jeff Davis, Loving, Pecos and 4 more | 7 hr |
| May 13, 11:37 PM CDT | Mesoscale Discussion | SPC | Crane, Culberson, Ector, Jeff Davis, Loving, Pecos and 3 more | 53 min |
| May 14, 2:17 AM CDT | Mesoscale Discussion | SPC | Val Verde | 118 min |
| May 14, 2:55 PM CDT | Severe Thunderstorm Watch | SPC | Brewster, Jeff Davis, Pecos, Presidio, Reeves, Terrell | 5 hr |
| May 14, 6:57 PM CDT | Mesoscale Discussion | SPC | Maverick | 63 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.