Alert archive / Texas / Mesoscale Discussions in 2012
Mesoscale Discussion 65
The Storm Prediction Center issued this mesoscale discussion at Jan 24, 2012, 11:34 PM CST for 44 counties in Texas. It was in force for 56 min.
The area
The outline as issued.
The facts
- Issued
- Jan 24, 2012, 11:34 PM CST (05:34 UTC)
- Expired
- Jan 25, 2012, 12:30 AM CST
- In force
- 56 min
- Issued by
- the Storm Prediction Center
All 44 counties
Atascosa County, TX, Bandera County, TX, Bastrop County, TX, Bee County, TX, Bexar County, TX, Blanco County, TX, Burnet County, TX, Caldwell County, TX, Comal County, TX, DeWitt County, TX, Dimmit County, TX, Duval County, TX, Edwards County, TX, Fayette County, TX, Frio County, TX, Gillespie County, TX, Goliad County, TX, Gonzales County, TX, Guadalupe County, TX, Hays County, TX, Karnes County, TX, Kendall County, TX, Kerr County, TX, Kimble County, TX, Kinney County, TX, La Salle County, TX, Lavaca County, TX, Lee County, TX, Live Oak County, TX, Llano County, TX, Mason County, TX, Maverick County, TX, McMullen County, TX, Medina County, TX, Real County, TX, Refugio County, TX, San Patricio County, TX, Travis County, TX, Uvalde County, TX, Victoria County, TX, Webb County, TX, Williamson County, TX, Wilson County, TX, Zavala County, TX
The radar
The Austin/San Antonio radar (KEWX), 75 km from the middle of the area, began a volume at 05:35 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 00:00Z, 5.6 hours before the alert went out and 206 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
- 1865 J/kg
- Mixed-layer CIN
- -2 J/kg
- Mixed-layer LCL
- 594 m above ground
- 0-6 km bulk shear
- 41 kt
- 0-1 km storm-relative helicity
- 146 m²/s²
- 0-3 km storm-relative helicity
- 260 m²/s²
- Significant tornado parameter
- 1.8
- Supercell composite
- 9.7
The text
As transmitted, in the capitals the NWS used until 2016.
883
ACUS11 KWNS 250534
SWOMCD
SPC MCD 250534
TXZ000-250630-
MESOSCALE DISCUSSION 0065
NWS STORM PREDICTION CENTER NORMAN OK
1134 PM CST TUE JAN 24 2012
AREAS AFFECTED...EDWARDS PLATEAU...HILL COUNTRY...S-CNTRL TX
CONCERNING...TORNADO WATCH 13...
VALID 250534Z - 250630Z
THE SEVERE WEATHER THREAT FOR TORNADO WATCH 13 CONTINUES.
PRIMARILY A SEVERE HAIL/DAMAGING WIND THREAT EXISTS WITH DEVELOPING
LINEAR MCS ALONG AND IMMEDIATELY W OF WW 13 OVER THE EDWARDS
PLATEAU. ADDITIONAL TSTMS SHOULD STRENGTHEN ACROSS S-CNTRL TX NEAR
LRD THROUGH EARLY MORNING...AND WOULD POSE A MORE SUBSTANTIAL
HAIL/TORNADO RISK.
WELL-ADVERTISED LINEAR MCS INVOF EDWARDS/KINNEY COUNTIES SHOULD
CONTINUE TO EXPAND E/NEWD ACROSS THE EDWARDS PLATEAU/HILL COUNTRY
WITHIN A ZONE OF FOCUSED ASCENT DOWNSTREAM OF MID-LEVEL IMPULSE
CENTERED OVER FAR W TX. RECENT SURFACE ANALYSES INDICATE THAT THIS
CLUSTER HAS REMAINED LARGELY POST-FRONTAL THUS FAR...PRIMARILY
POSING A SEVERE HAIL THREAT. AS ASCENT OVERSPREADS THE BROADER WARM
SECTOR...ADDITIONAL DEVELOPMENT ALONG/JUST AHEAD OF THE SURFACE
FRONT APPEARS PROBABLE...YIELDING A MIX OF ISOLATED SEVERE
HAIL/DAMAGING WIND THREATS AND PERHAPS A BRIEF TORNADO.
MID-LEVEL CONVECTION HAS BEEN INCREASING FARTHER SE TOWARDS
LRD...WITH INCIPIENT TSTM DEVELOPMENT APPEARING TO BE UNDERWAY.
GIVEN A MUCH BROADER WARM/MOIST SECTOR ALONG WITH STRONG SLYS AOA 30
KT ALONG AND E OF THE I-35 CORRIDOR...THIS SETUP SHOULD BE FAVORABLE
FOR SUPERCELLS CAPABLE OF PRODUCING TORNADOES AND LARGE HAIL.
..GRAMS.. 01/25/2012
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...HGX...FWD...CRP...EWX...SJT...
LAT...LON 30040044 30320025 30889925 31039840 30879710 30569673
30289667 29929646 29339663 28239720 27999753 27719823
27629847 27629901 27669934 27829968 28380039 29120073
30040044SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jan 24, 7:13 PM CST | Mesoscale Discussion | SPC | Atascosa, Bandera, Bastrop, Bexar, Blanco, Caldwell and 23 more | 92 min |
| Jan 24, 10:05 PM CST | Tornado Watch | SPC | Atascosa, Bandera, Bastrop, Bee, Bexar, Blanco and 33 more | 5 hr |
| Jan 25, 2:12 AM CST | Mesoscale Discussion | SPC | Atascosa, Austin, Bandera, Bastrop, Bee, Bell and 56 more | 2 hr |
| Jan 25, 3:17 AM CST | Tornado Watch | SPC | Anderson, Aransas, Atascosa, Austin, Bastrop, Bee and 67 more | 11 hr |
| Jan 25, 7:13 AM CST | Mesoscale Discussion | SPC | Anderson, Angelina, Aransas, Austin, Bee, Brazoria and 40 more | 2 hr |
| Jan 25, 7:56 AM CST | Tornado Watch | SPC | Angelina, Cherokee, Hardin, Jasper, Jefferson, Nacogdoches and 8 more | 7 hr |
| Jan 25, 10:09 AM CST | Mesoscale Discussion | SPC | Brazoria, Chambers, Fort Bend, Harris, Liberty, Matagorda and 5 more | 96 min |
| Jan 25, 11:24 AM CST | Mesoscale Discussion | SPC | Brazoria, Chambers, Galveston, Hardin, Harrison, Jasper and 10 more | 2 hr |
| Jan 25, 2:08 PM CST | Tornado Watch | SPC | Jefferson, Orange | 7 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.