Alert archive / Texas / Mesoscale Discussions in 2012
Mesoscale Discussion 68
The Storm Prediction Center issued this mesoscale discussion at Jan 25, 2012, 10:09 AM CST for 11 counties in Texas. It was in force for 96 min.
The area
The outline as issued.
The facts
- Issued
- Jan 25, 2012, 10:09 AM CST (16:09 UTC)
- Expired
- Jan 25, 2012, 11:45 AM CST
- In force
- 96 min
- Issued by
- the Storm Prediction Center
Counties Brazoria County, TX, Chambers County, TX, Fort Bend County, TX, Harris County, TX, Liberty County, TX, Matagorda County, TX, Montgomery County, TX, Polk County, TX, San Jacinto County, TX, Waller County, TX, Wharton County, TX
The radar
The Houston radar (KHGX), 62 km from the middle of the area, began a volume at 16:11 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
Lake Charles Mun, LA (KLCH), launched 12:00Z, 4.2 hours before the alert went out and 207 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
- 28 J/kg
- Mixed-layer CIN
- -201 J/kg
- Mixed-layer LCL
- 576 m above ground
- 0-6 km bulk shear
- 43 kt
- 0-1 km storm-relative helicity
- 241 m²/s²
- 0-3 km storm-relative helicity
- 341 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 2.6
The text
As transmitted, in the capitals the NWS used until 2016.
400
ACUS11 KWNS 251610
SWOMCD
SPC MCD 251609
TXZ000-251745-
MESOSCALE DISCUSSION 0068
NWS STORM PREDICTION CENTER NORMAN OK
1009 AM CST WED JAN 25 2012
AREAS AFFECTED...SERN TX
CONCERNING...TORNADO WATCH 14...
VALID 251609Z - 251745Z
THE SEVERE WEATHER THREAT FOR TORNADO WATCH 14 CONTINUES.
A LINE OF STORMS WILL CONTINUE TO SLOWLY MOVE AND PROPAGATE EWD
ACROSS THE REMAINDER OF SERN TEXAS OVER THE NEXT FEW HOURS. AT THE
CURRENT RATE OF MOTION...IT MAY TAKE AROUND 2-3 HOURS TO CLEAR THE
REMAINING PORTIONS OF TORNADO WATCH 14. THEREFORE...EITHER A LOCAL
EXTENSION OR PERHAPS AN ADDITIONAL/SMALL WATCH MAY BE NECESSARY.
ALTHOUGH STORM MODE IS QUASI-LINEAR...SHEAR PROFILES REMAIN QUITE
FAVORABLE FOR SUSTAINED LONG LIVED CONVECTIVE SYSTEMS WITH THE
POSSIBILITY OF ROTATION AND BRIEF TORNADOES.
..JEWELL.. 01/25/2012
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...LCH...SHV...HGX...CRP...
LAT...LON 29499455 28309629 29239654 30219595 30749535 31419496
31009458 29499455SPC 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 24, 11:34 PM CST | Mesoscale Discussion | SPC | Atascosa, Bandera, Bastrop, Bee, Bexar, Blanco and 38 more | 56 min |
| 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, 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.