Alert archive / Texas / Mesoscale Discussions in 2012
Mesoscale Discussion 759
The Storm Prediction Center issued this mesoscale discussion at May 8, 2012, 3:03 PM CDT for 4 counties in Texas. It was in force for 87 min.
The area
The outline as issued.
The facts
- Issued
- May 8, 2012, 3:03 PM CDT (20:03 UTC)
- Expired
- May 8, 2012, 4:30 PM CDT
- In force
- 87 min
- Issued by
- the Storm Prediction Center
Counties Cameron County, TX, Hidalgo County, TX, Starr County, TX, Willacy County, TX
The radar
The Brownsville radar (KBRO), 105 km from the middle of the area, began a volume at 20:05 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
Brownsville Intl, TX (KBRO), launched 12:00Z, 8.1 hours before the alert went out and 108 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
- 1588 J/kg
- Mixed-layer CIN
- -37 J/kg
- Mixed-layer LCL
- 637 m above ground
- 0-6 km bulk shear
- 38 kt
- 0-1 km storm-relative helicity
- 17 m²/s²
- 0-3 km storm-relative helicity
- 64 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 1.0
The text
As transmitted, in the capitals the NWS used until 2016.
051
ACUS11 KWNS 082004
SWOMCD
SPC MCD 082003
TXZ000-082130-
MESOSCALE DISCUSSION 0759
NWS STORM PREDICTION CENTER NORMAN OK
0303 PM CDT TUE MAY 08 2012
AREAS AFFECTED...DEEP SOUTH TEXAS
CONCERNING...SEVERE THUNDERSTORM WATCH 267...
VALID 082003Z - 082130Z
THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 267
CONTINUES.
SUMMARY...RISK FOR SUPERCELLS CONTINUES AND MAY INCREASE A BIT
THROUGH 22-00Z...ACROSS STARR/HIDALGO/CAMERON AND WILLACY COUNTIES.
DISCUSSION...ALTHOUGH THE INITIAL INTENSE SUPERCELL DISSIPATED EAST
OF ZAPATA COUNTY...NEW CONVECTION CONTINUES TO DEVELOP TO THE
WEST...ABOVE ITS OUTFLOW...AND WITHIN MOIST UPSLOPE FLOW TO THE WEST
OF THE RIO GRANDE RIVER. AS WEAK TO MODERATE WESTERLY DEEP LAYER
MEAN FLOW ADVECTS THIS ACTIVITY EASTWARD...POTENTIAL EXISTS FOR
INTENSIFICATION NEAR/NORTHWEST OF MCALLEN INTO THE BROWNSVILLE AREA
BETWEEN NOW AND 22-00Z. ALONG AND JUST SOUTH OF A SOUTHWARD
ADVANCING COLD FRONT...LOW-LEVEL CONVERGENCE HAS BEEN STRENGTHENING
ACROSS THIS REGION...IN THE PRESENCE OF STEEPENING LOW-LEVEL LAPSE
RATES AND MODERATELY LARGE CAPE. AS A 30-40 KT WESTERLY 500 MB JET
GRADUALLY SHIFTS THROUGH THE LOWER GRANDE VALLEY...VERTICAL SHEAR
PROFILES ARE BECOMING INCREASINGLY FAVORABLE FOR SUPERCELLS.
..KERR.. 05/08/2012
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...BRO...
LAT...LON 26379943 26759923 26889869 26769808 26889767 26479738
26059729 25599753 25529791 25999938 26379943SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 7, 7:39 PM CDT | Severe Thunderstorm Watch | SPC | Camp, Gregg, Harrison, Marion, Morris, Panola and 5 more | 4 hr |
| May 7, 7:54 PM CDT | Mesoscale Discussion | SPC | Atascosa, Bandera, Bastrop, Bee, Bexar, Brazos and 40 more | 66 min |
| May 7, 9:15 PM CDT | Mesoscale Discussion | SPC | Camp, Cass, Gregg, Harrison, Marion, Morris and 6 more | 60 min |
| May 7, 9:46 PM CDT | Mesoscale Discussion | SPC | Andrews, Borden, Crane, Crockett, Dawson, Ector and 15 more | 89 min |
| May 8, 1:42 AM CDT | Mesoscale Discussion | SPC | Atascosa, Bandera, Bexar, Comal, Dimmit, Edwards and 13 more | 93 min |
| May 8, 10:44 AM CDT | Mesoscale Discussion | SPC | Bee, Brooks, Duval, Frio, Goliad, Jim Hogg and 11 more | 61 min |
| May 8, 10:58 AM CDT | Severe Thunderstorm Watch | SPC | Aransas, Atascosa, Bee, Brooks, Calhoun, Cameron and 28 more | 8 hr |
| May 8, 1:37 PM CDT | Mesoscale Discussion | SPC | Brewster, Culberson, El Paso, Hudspeth, Jeff Davis, Presidio and 1 more | 113 min |
| May 8, 2:07 PM CDT | Severe Thunderstorm Watch | SPC | Brewster, Culberson, El Paso, Hudspeth, Jeff Davis, Presidio | 7 hr |
| May 8, 4:53 PM CDT | Mesoscale Discussion | SPC | Brewster, Culberson, El Paso, Hudspeth, Jeff Davis, Presidio | 67 min |
| May 8, 5:47 PM CDT | Mesoscale Discussion | SPC | Cameron, Hidalgo, Kenedy, Willacy | 58 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.