Alert archive / Texas / Mesoscale Discussions in 2012
Mesoscale Discussion 773
The Storm Prediction Center issued this mesoscale discussion at May 10, 2012, 9:51 AM CDT for 45 counties in Texas. It was in force for 114 min.
The area
The outline as issued.
The facts
- Issued
- May 10, 2012, 9:51 AM CDT (14:51 UTC)
- Expired
- May 10, 2012, 11:45 AM CDT
- In force
- 114 min
- Issued by
- the Storm Prediction Center
All 45 counties
Atascosa County, TX, Bandera County, TX, Bee County, TX, Bexar County, TX, Brooks County, TX, Cameron County, TX, Comal County, TX, Crockett County, TX, Dimmit County, TX, Duval County, TX, Edwards County, TX, Frio County, TX, Gillespie County, TX, Goliad County, TX, Guadalupe County, TX, Hidalgo County, TX, Jim Hogg County, TX, Jim Wells County, TX, Karnes County, TX, Kendall County, TX, Kenedy County, TX, Kerr County, TX, Kimble County, TX, Kinney County, TX, Kleberg County, TX, La Salle County, TX, Live Oak County, TX, Mason County, TX, Maverick County, TX, McMullen County, TX, Medina County, TX, Menard County, TX, Nueces County, TX, Real County, TX, San Patricio County, TX, Schleicher County, TX, Starr County, TX, Sutton County, TX, Uvalde County, TX, Val Verde County, TX, Webb County, TX, Willacy County, TX, Wilson County, TX, Zapata County, TX, Zavala County, TX
The radar
The Laughlin AFB radar (KDFX), 150 km from the middle of the area, began a volume at 14:51 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, 2.9 hours before the alert went out and 185 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.
581
ACUS11 KWNS 101451
SWOMCD
SPC MCD 101451
TXZ000-101645-
MESOSCALE DISCUSSION 0773
NWS STORM PREDICTION CENTER NORMAN OK
0951 AM CDT THU MAY 10 2012
AREAS AFFECTED...PORTIONS OF CENTRAL AND S TX INCLUDING THE MID AND
LOWER RIO GRANDE VALLEY
CONCERNING...SEVERE THUNDERSTORM WATCH 270...
VALID 101451Z - 101645Z
THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 270
CONTINUES.
SUMMARY...THREAT FOR LARGE HAIL AND DAMAGING WINDS CONTINUES FROM
THE TX BIG BEND AREA INTO PARTS OF CENTRAL AND S TX. SOUTHERN
PORTIONS OF THE WW MAY REQUIRE UPGRADE TO TORNADO WATCH LATER THIS
MORNING.
DISCUSSION...LATEST WATER VAPOR LOOP SHOWS THE UPPER LOW CONTINUING
TO MAKE SLOW/STEADY EWD PROGRESS TOWARD FAR W TX...WHILE A JET
STREAK S OF THIS FEATURE -- OVER NRN MEXICO -- IS NOSING ACROSS THE
RIO GRANDE VALLEY INTO CENTRAL AND S TX.
ASCENT ASSOCIATED WITH THIS FEATURE COMBINED WITH CONTINUED HEATING
OF A VERY MOIST LOWER TROPOSPHERE STREAMING NWWD ACROSS S TX/THE RIO
GRANDE VALLEY WILL CONTINUE TO FUEL DEVELOPMENT/INTENSIFICATION IN
AND NEAR THE ONGOING WW. WITH THE ENVIRONMENT SUPPORTING
SUPERCELLS...WIND/HAIL THREAT SHOULD EVENTUALLY EXPAND TO INCLUDE
ISOLATED TORNADOES...AS BOUNDARY-LAYER DESTABILIZATION CONTINUES
INTO THE AFTERNOON HOURS.
..GOSS.. 05/10/2012
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...CRP...EWX...BRO...SJT...MAF...
LAT...LON 25859861 30670168 31080119 30779902 29459762 25869635
25859861SPC 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, 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 |
| May 10, 5:43 PM CDT | Mesoscale Discussion | SPC | Aransas, Atascosa, Bee, Brooks, Cameron, DeWitt and 23 more | 2 hr |
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.