Alert archive / Texas / Mesoscale Discussions in 2012
Mesoscale Discussion 294
The Storm Prediction Center issued this mesoscale discussion at Mar 19, 2012, 6:05 PM CDT for 53 counties in Texas. It was in force for 85 min.
The area
The outline as issued.
The facts
- Issued
- Mar 19, 2012, 6:05 PM CDT (23:05 UTC)
- Expired
- Mar 19, 2012, 7:30 PM CDT
- In force
- 85 min
- Issued by
- the Storm Prediction Center
All 53 counties
Atascosa County, TX, Bandera County, TX, Bastrop County, TX, Bexar County, TX, Blanco County, TX, Bosque County, TX, Burnet County, TX, Caldwell County, TX, Collin County, TX, Comal County, TX, Coryell County, TX, Dallas County, TX, Denton County, TX, DeWitt County, TX, Dimmit County, TX, Edwards County, TX, Ellis County, TX, Erath County, TX, Fannin County, TX, Frio County, TX, Gillespie County, TX, Gonzales County, TX, Grayson County, TX, Guadalupe County, TX, Hamilton County, TX, Hays County, TX, Hill County, TX, Hood County, TX, Hunt County, TX, Johnson County, TX, Karnes County, TX, Kendall County, TX, Kerr County, TX, Kimble County, TX, Kinney County, TX, La Salle County, TX, Lampasas County, TX, Lee County, TX, Llano County, TX, Mason County, TX, Medina County, TX, Mills County, TX, Parker County, TX, Real County, TX, Rockwall County, TX, San Saba County, TX, Somervell County, TX, Tarrant County, TX, Travis County, TX, Uvalde County, TX, Williamson County, TX, Wilson County, TX, Zavala County, TX
The radar
The Ft Hood radar (KGRK), 105 km from the middle of the area, began a volume at 23:05 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 watches that followed
Watches SPC issued over any of the same counties within four hours of this discussion.
The nearest sounding before it
Fort Worth, TX (KFWD), launched 12:00Z, 11.1 hours before the alert went out and 255 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
- 1782 J/kg
- Mixed-layer CIN
- -18 J/kg
- Mixed-layer LCL
- 509 m above ground
- 0-6 km bulk shear
- 35 kt
- 0-1 km storm-relative helicity
- 318 m²/s²
- 0-3 km storm-relative helicity
- 447 m²/s²
- Significant tornado parameter
- 3.3
- Supercell composite
- 17.2
The text
As transmitted, in the capitals the NWS used until 2016.
845
ACUS11 KWNS 192305
SWOMCD
SPC MCD 192305
OKZ000-TXZ000-200030-
MESOSCALE DISCUSSION 0294
NWS STORM PREDICTION CENTER NORMAN OK
0605 PM CDT MON MAR 19 2012
AREAS AFFECTED...SCNTRL THROUGH NCNTRL TX
CONCERNING...TORNADO WATCH 85...
VALID 192305Z - 200030Z
THE SEVERE WEATHER THREAT FOR TORNADO WATCH 85 CONTINUES.
GREATEST SEVERE THREAT IS EXPECTED TO PERSIST OVER CNTRL AND SCNTRL
TX PORTION OF TORNADO WATCH 86 THROUGH 01Z. TENDENCY HAS BEEN FOR
STORMS TO DEVELOP FARTHER SOUTH AND A NEW WW WILL BE ISSUED SHORTLY
FOR PORTIONS OF SCNTRL TX.
LINE OF STORMS FROM NCNTRL THROUGH SCNTRL TX IS MOVING SLOWLY EWD AT
AROUND 15 KT OR LESS. STRONGEST AND MORE DISCRETE STORMS PERSIST
OVER SCNTRL TX NORTHWEST AND WEST OF SAN ANTONIO WHERE THE
ATMOSPHERE REMAINS VERY UNSTABLE WITH MLCAPE FROM 2500-3000 J/KG AND
EFFECTIVE BULK SHEAR FROM 40-50 KT. TREND HAS BEEN FOR STORM TO
INCREASE IN COVERAGE...POSSIBLY IN RESPONSE TO AN IMPULSE MOVING
THROUGH BASE OF UPPER TROUGH. THIS ACTIVITY WILL POSE A THREAT FOR
VERY LARGE HAIL AND TORNADOES INTO THE EVENING AS IT DEVELOPS NEWD.
FARTHER NORTH INTO NCNTRL TX STORMS HAVE BEEN MORE LINEAR IN
NATURE...BUT STILL MAY POSE A THREAT FOR ISOLATED DAMAGING WIND...AN
ISOLATED TORNADO OR TWO AS WELL AS VERY HEAVY RAIN.
..DIAL.. 03/19/2012
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...FWD...OUN...CRP...EWX...SJT...
LAT...LON 30949966 31859855 33589731 33749595 32939612 30959786
30319689 29179698 28069968 28750015 29170043 29580095
30949966SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 18, 7:37 PM CDT | Mesoscale Discussion | SPC | Childress, Collingsworth, Cottle, Dickens, Fisher, Foard and 13 more | 53 min |
| Mar 18, 9:10 PM CDT | Mesoscale Discussion | SPC | Childress, Collingsworth, Cottle, Crosby, Dickens, Donley and 7 more | 35 min |
| Mar 18, 10:09 PM CDT | Mesoscale Discussion | SPC | Andrews, Borden, Crane, Crosby, Dawson, Ector and 13 more | 96 min |
| Mar 18, 10:50 PM CDT | Severe Thunderstorm Watch | SPC | Andrews, Borden, Briscoe, Castro, Childress, Coke and 39 more | 11 hr |
| Mar 18, 11:23 PM CDT | Tornado Watch | SPC | Briscoe, Crosby, Floyd, Garza, Hale, Hall and 6 more | 4 hr |
| Mar 18, 11:37 PM CDT | Mesoscale Discussion | SPC | Collingsworth, Donley, Gray, Hemphill, Lipscomb, Ochiltree and 2 more | 53 min |
| Mar 19, 1:37 AM CDT | Mesoscale Discussion | SPC | Borden, Childress, Coke, Collingsworth, Cottle, Dickens and 25 more | 83 min |
| Mar 19, 1:56 AM CDT | Severe Thunderstorm Watch | SPC | Archer, Baylor, Clay, Foard, Hardeman, Knox and 2 more | 4 hr |
| Mar 19, 3:34 AM CDT | Mesoscale Discussion | SPC | Wilbarger | 86 min |
| Mar 19, 4:13 AM CDT | Mesoscale Discussion | SPC | Coke, Fisher, Foard, Glasscock, Haskell, Howard and 16 more | 92 min |
| Mar 19, 4:39 AM CDT | Severe Thunderstorm Watch | SPC | Callahan, Coke, Coleman, Concho, Crockett, Fisher and 22 more | 7 hr |
| Mar 19, 10:05 AM CDT | Mesoscale Discussion | SPC | Clay, Cooke, Grayson, Montague | 115 min |
| Mar 19, 10:46 AM CDT | Mesoscale Discussion | SPC | Callahan, Coke, Irion, Jones, Nolan, Runnels and 4 more | 89 min |
| Mar 19, 2:15 PM CDT | Mesoscale Discussion | SPC | Bosque, Brown, Collin, Comanche, Concho, Cooke and 26 more | 90 min |
| Mar 19, 2:39 PM CDT | Tornado Watch | SPC | Bandera, Blanco, Bosque, Brown, Burnet, Coleman and 42 more | 7 hr |
| Mar 19, 6:21 PM CDT | Tornado Watch | SPC | Atascosa, Bandera, Bastrop, Bexar, Blanco, Burnet and 26 more | 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.