Alert archive / Texas / Mesoscale Discussions in 2012
Mesoscale Discussion 780
The Storm Prediction Center issued this mesoscale discussion at May 10, 2012, 5:43 PM CDT for 29 counties in Texas. It was in force for 2 hr.
The area
The outline as issued.
The facts
- Issued
- May 10, 2012, 5:43 PM CDT (22:43 UTC)
- Expired
- May 10, 2012, 7:45 PM CDT
- In force
- 2 hr
- Issued by
- the Storm Prediction Center
All 29 counties
Aransas County, TX, Atascosa County, TX, Bee County, TX, Brooks County, TX, Cameron County, TX, DeWitt County, TX, Dimmit County, TX, Duval County, TX, Frio County, TX, Goliad County, TX, Hidalgo County, TX, Jim Hogg County, TX, Jim Wells County, TX, Karnes County, TX, Kenedy County, TX, Kleberg County, TX, La Salle County, TX, Live Oak County, TX, McMullen County, TX, Nueces County, TX, Refugio County, TX, San Patricio County, TX, Starr County, TX, Victoria County, TX, Webb County, TX, Willacy County, TX, Wilson County, TX, Zapata County, TX, Zavala County, TX
The radar
The Corpus Christi radar (KCRP), 52 km from the middle of the area, began a volume at 22:43 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
Corpus Christi, TX (KCRP), launched 12:00Z, 10.7 hours before the alert went out and 69 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
- 1593 J/kg
- Mixed-layer CIN
- -4 J/kg
- Mixed-layer LCL
- 779 m above ground
- 0-6 km bulk shear
- 31 kt
- 0-1 km storm-relative helicity
- 13 m²/s²
- 0-3 km storm-relative helicity
- 122 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 0.9
The text
As transmitted, in the capitals the NWS used until 2016.
608
ACUS11 KWNS 102243
SWOMCD
SPC MCD 102243
TXZ000-110045-
MESOSCALE DISCUSSION 0780
NWS STORM PREDICTION CENTER NORMAN OK
0543 PM CDT THU MAY 10 2012
AREAS AFFECTED...PORTIONS OF SOUTH TX
CONCERNING...TORNADO WATCH 271...
VALID 102243Z - 110045Z
THE SEVERE WEATHER THREAT FOR TORNADO WATCH 271 CONTINUES.
SUMMARY...THE THREAT FOR SVR TSTMS WILL CONTINUE INTO THE EVENING
HOURS...WITH INCREASING COVERAGE OF SVR STORMS ANTICIPATED DURING
THE NEXT COUPLE OF HOURS.
DISCUSSION...MESOANALYSIS AT 22Z DEPICTS AN OUTFLOW BOUNDARY
EXTENDING ACROSS NRN PARTS OF THE TX BRUSH COUNTRY...IN THE VICINITY
OF WHICH SUPERCELLS WILL CONTINUE TO TRAIN FROM LA SALLE COUNTY
ENEWD TOWARD DEWITT COUNTY DURING THE NEXT COUPLE OF HOURS. ALONG
WITH LARGE HAIL...DMGG WIND GUSTS...AND POSSIBLY TORNADOES...VERY
HEAVY RAINFALL WILL BE A CONCERN WITH THESE STORMS.
ADDITIONAL CONVECTION CONTINUES TO DEVELOP OVER THE HIGHER TERRAIN
OF NRN MEXICO...AIDED BY THE COMBINATION OF OROGRAPHIC EFFECTS AND A
LOBE OF ASCENT ASSOCIATED WITH DCVA ATTENDANT TO AN APPROACHING
CLOSED LOW. AREA RADARS SUGGEST THAT THESE STORMS EXHIBIT DISCRETE
SUPERCELL CHARACTERISTICS...WHICH MAY BE MAINTAINED AS THEY CROSS
THE RIO GRANDE RIVER DURING THE NEXT COUPLE OF HOURS. AS THE STRONG
ASCENT INTERACTS WITH MODERATE INSTABILITY AND RICH/DEEP MOISTURE
OVER S TX...CONVECTIVE COVERAGE SHOULD ALSO INCREASE THIS EVENING
WITH UPSCALE GROWTH INTO ONE OR MORE CONVECTIVE COMPLEXES POSSIBLE.
ALONG WITH DMGG WIND GUSTS AND LARGE HAIL...STRONG LOW-LEVEL
HELICITY OWING TO NOTABLE DIRECTIONAL SHEAR IN THE LOW LEVELS --
E.G. 227 M2/S2 OF 0-1-KM SRH PER CORPUS CHRISTI VWP DATA -- WILL
ALSO SUPPORT A THREAT FOR TORNADOES. THIS WILL ESPECIALLY BE THE
CASE WITH STORMS INTERACTING WITH THE AFOREMENTIONED OUTFLOW
BOUNDARY.
..COHEN.. 05/10/2012
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...CRP...EWX...BRO...
LAT...LON 29489786 29459733 29059699 28639672 28129671 27559717
26849730 26139711 25819734 26089838 26579922 27800003
28650045 29009977 29489786SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 9, 10:09 PM CDT | Mesoscale Discussion | SPC | Hidalgo, Kenedy, Willacy | 66 min |
| May 10, 5:27 AM CDT | Mesoscale Discussion | SPC | Atascosa, Bandera, Brooks, Dimmit, Duval, Edwards and 19 more | 2 hr |
| May 10, 5:42 AM CDT | Severe Thunderstorm Watch | SPC | Atascosa, Bandera, Bee, Bexar, Brooks, Cameron and 36 more | 7 hr |
| May 10, 9:51 AM CDT | Mesoscale Discussion | SPC | Atascosa, Bandera, Bee, Bexar, Brooks, Cameron and 39 more | 114 min |
| May 10, 11:40 AM CDT | Tornado Watch | SPC | Aransas, Atascosa, Bee, Brooks, Calhoun, Cameron and 27 more | 8 hr |
| May 10, 11:52 AM CDT | Mesoscale Discussion | SPC | Bandera, Bexar, Blanco, Brown, Coke, Coleman and 24 more | 53 min |
| May 10, 12:32 PM CDT | Severe Thunderstorm Watch | SPC | Bandera, Bastrop, Bexar, Blanco, Burnet, Caldwell and 25 more | 7 hr |
| May 10, 2:07 PM CDT | Mesoscale Discussion | SPC | Aransas, Atascosa, Bee, Brooks, DeWitt, Dimmit and 19 more | 113 min |
| May 10, 3:04 PM CDT | Mesoscale Discussion | SPC | Bandera, Bastrop, Bexar, Blanco, Burnet, Caldwell and 18 more | 116 min |
| May 10, 5:21 PM CDT | Mesoscale Discussion | SPC | Crockett, Edwards, Sutton, Terrell, Val Verde | 54 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.