Alert archive / Texas / Mesoscale Discussions in 2012
Mesoscale Discussion 299
The Storm Prediction Center issued this mesoscale discussion at Mar 19, 2012, 9:46 PM CDT for 24 counties in Texas. It was in force for 119 min.
The area
The outline as issued.
The facts
- Issued
- Mar 19, 2012, 9:46 PM CDT (02:46 UTC)
- Expired
- Mar 19, 2012, 11:45 PM CDT
- In force
- 119 min
- Issued by
- the Storm Prediction Center
All 24 counties
Bandera County, TX, Bell County, TX, Blanco County, TX, Burnet County, TX, Coryell County, TX, Ellis County, TX, Falls County, TX, Gillespie County, TX, Hill County, TX, Kaufman County, TX, Kendall County, TX, Kerr County, TX, Kinney County, TX, Lampasas County, TX, Llano County, TX, McLennan County, TX, Medina County, TX, Navarro County, TX, Real County, TX, Rockwall County, TX, Uvalde County, TX, Van Zandt County, TX, Williamson County, TX, Zavala County, TX
The radar
The Ft Hood radar (KGRK), 61 km from the middle of the area, began a volume at 02:49 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
Del Rio, TX (KDRT), launched 00:00Z, 2.8 hours before the alert went out and 362 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
- 1142 J/kg
- Mixed-layer CIN
- -180 J/kg
- Mixed-layer LCL
- 2280 m above ground
- 0-6 km bulk shear
- 72 kt
- 0-1 km storm-relative helicity
- 74 m²/s²
- 0-3 km storm-relative helicity
- 170 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.3
The text
As transmitted, in the capitals the NWS used until 2016.
312
ACUS11 KWNS 200247
SWOMCD
SPC MCD 200246
TXZ000-200445-
MESOSCALE DISCUSSION 0299
NWS STORM PREDICTION CENTER NORMAN OK
0946 PM CDT MON MAR 19 2012
AREAS AFFECTED...SCNTRL THROUGH NERN TX
CONCERNING...HEAVY RAINFALL
VALID 200246Z - 200445Z
HEAVY RAIN WITH RATES LOCALLY FROM 1-2 INCHES PER HOUR WILL REMAIN
LIKELY INTO THE EARLY MORNING. THE HIGHER RATES ARE EXPECTED FROM
S-CNTRL THROUGH ECNTRL TX INCLUDING THE HILL COUNTRY.
EXTENSIVE CONVECTIVELY ACTIVE OUTFLOW BOUNDARY EXTENDS FROM NERN TX
SWWD THROUGH SCNTRL AND SWRN TX EAST OF DEL RIO. NERN PORTION OF THE
BOUNDARY HAS BEEN A LITTLE MORE PROGRESSIVE...BUT TREND HAS BEEN FOR
THIS FEATURE TO BECOME NEARLY STATIONARY...ESPECIALLY ALONG SWRN
PORTIONS. DEEPER FORCING FOR ASCENT IS BEGINNING TO OVERTAKE THE
BOUNDARY WITH CONVECTION BACKBUILDING SWWD TO NEAR THE MEXICAN
BORDER. WITH HIGH AMPLITUDE TROUGH AXIS STILL TO THE WEST AND THE
TENDENCY FOR MID-UPPER FLOW TO BACK WITH TIME...STORMS WILL LIKELY
CONTINUE TRAINING NEWD ALONG THE BOUNDARY. A SLY LLJ WILL MAINTAIN
INFLUX OF HIGH THETA-E AIR FROM THE MOIST AND UNSTABLE WARM SECTOR
AS THE STORMS TRAIN NEWD THROUGH THE EARLY MORNING.
..DIAL.. 03/20/2012
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...FWD...EWX...SJT...
LAT...LON 32689569 30559740 28719987 29440058 31089851 33169627
32689569SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 19, 7:28 PM CDT | Tornado Watch | SPC | Anderson, Bell, Bowie, Camp, Cass, Cherokee and 30 more | 9 hr |
| Mar 19, 8:22 PM CDT | Mesoscale Discussion | SPC | Bandera, Bell, Bexar, Blanco, Burnet, Comal and 30 more | 53 min |
| Mar 19, 11:53 PM CDT | Mesoscale Discussion | SPC | Atascosa, Bastrop, Bell, Bexar, Burleson, Caldwell and 28 more | 67 min |
| Mar 20, 12:48 AM CDT | Severe Thunderstorm Watch | SPC | Aransas, Atascosa, Austin, Bastrop, Bee, Bexar and 52 more | 9 hr |
| Mar 20, 2:43 AM CDT | Mesoscale Discussion | SPC | Aransas, Bee, Calhoun, Colorado, DeWitt, Duval and 13 more | 92 min |
| Mar 20, 5:26 AM CDT | Mesoscale Discussion | SPC | Brazoria, Calhoun, Fort Bend, Harris, Liberty, Matagorda and 3 more | 2 hr |
| Mar 20, 9:03 AM CDT | Mesoscale Discussion | SPC | Chambers, Galveston, Hardin, Jasper, Jefferson, Liberty and 6 more | 87 min |
| Mar 20, 9:46 AM CDT | Tornado Watch | SPC | Hardin, Jasper, Jefferson, Newton, Orange, Sabine and 3 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.