Alert archive / Texas / Mesoscale Discussions in 2012
Mesoscale Discussion 1740
The Storm Prediction Center issued this mesoscale discussion at Aug 10, 2012, 6:57 PM CDT for 6 parishes in Louisiana; 17 counties in Texas. It was in force for 63 min.
The area
The outline as issued.
The facts
- Issued
- Aug 10, 2012, 6:57 PM CDT (23:57 UTC)
- Expired
- Aug 10, 2012, 8:00 PM CDT
- In force
- 63 min
- Issued by
- the Storm Prediction Center
All 23 counties
Allen Parish, LA, Beauregard Parish, LA, Calcasieu Parish, LA, Cameron Parish, LA, Evangeline Parish, LA, Jefferson Davis Parish, LA, Austin County, TX, Chambers County, TX, Colorado County, TX, DeWitt County, TX, Fayette County, TX, Fort Bend County, TX, Gonzales County, TX, Guadalupe County, TX, Hardin County, TX, Harris County, TX, Jefferson County, TX, Lavaca County, TX, Liberty County, TX, Orange County, TX, Waller County, TX, Wharton County, TX, Wilson County, TX
The radar
The Houston radar (KHGX), 44 km from the middle of the area, began a volume at 23:56 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, 12.0 hours before the alert went out and 176 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
- 2090 J/kg
- Mixed-layer CIN
- -90 J/kg
- Mixed-layer LCL
- 1009 m above ground
- 0-6 km bulk shear
- 25 kt
- 0-1 km storm-relative helicity
- 31 m²/s²
- 0-3 km storm-relative helicity
- 99 m²/s²
- Significant tornado parameter
- -0.0
- Supercell composite
- -0.4
The text
As transmitted, in the capitals the NWS used until 2016.
005
ACUS11 KWNS 102357
SWOMCD
SPC MCD 102357
LAZ000-TXZ000-110100-
MESOSCALE DISCUSSION 1740
NWS STORM PREDICTION CENTER NORMAN OK
0657 PM CDT FRI AUG 10 2012
AREAS AFFECTED...S CNTRL/SERN TX...SWRN LA
CONCERNING...SEVERE THUNDERSTORM WATCH 572...
VALID 102357Z - 110100Z
THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 572
CONTINUES.
SUMMARY...A CONTINUED THREAT OF DMGG WINDS WILL EXIST ACROSS THE WW
AREA.
DISCUSSION...INITIAL SEVERE THUNDERSTORM DEVELOPMENT APPEARS TO HAVE
INITIATED IN ADVANCE OF A SUBTLE VORT MAX /IMPLIED BY DARKENING ON
WV IMAGERY ACROSS S CNTRL TX NWWD INTO THE APPALACHIANS/ AND A WEAK
SWD SAGGING COLD FRONT. GIVEN SEASONABLY WARM SURFACE TEMPERATURES
AND AMPLE MOISTURE /PARTICULARLY TO THE S OF THE FRONT AND CURRENT
COMPLEX OF THUNDERSTORMS WHERE TD VALUES ARE IN THE LOWER TO MID 70S
F/...AT LEAST ISOLATED SEVERE STORMS WILL LIKELY CONTINUE OVER THE
NEXT FEW HOURS...AS BOUNDARY LAYER STABILIZATION WILL BE SOMEWHAT
SLOW DESPITE THE ONSET OF DIURNAL COOLING. ADDITIONAL STORMS WILL BE
POSSIBLE ALONG ANY RESULTING OUTFLOW BOUNDARIES.
..HURLBUT.. 08/10/2012
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...LCH...HGX...CRP...EWX...
LAT...LON 29599364 29329525 28959695 28979809 29349842 29779799
30359462 30499395 31129269 30829224 30029260 29599364SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 10, 3:58 PM CDT | Mesoscale Discussion | SPC | Beauregard | 92 min |
| Aug 10, 4:31 PM CDT | Severe Thunderstorm Watch | SPC | Acadia, Allen, Avoyelles, Beauregard, Calcasieu, Cameron and 5 more | 5 hr |
Nearby
Mesoscale Discussions in Texas, 2012Mesoscale Discussions in Louisiana, 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.