Alert archive / Louisiana / Mesoscale Discussions in 2012
Mesoscale Discussion 86
The Storm Prediction Center issued this mesoscale discussion at Feb 1, 2012, 1:36 PM CST for 18 parishes in Louisiana; 17 counties in Texas. It was in force for 84 min.
The area
The outline as issued.
The facts
- Issued
- Feb 1, 2012, 1:36 PM CST (19:36 UTC)
- Expired
- Feb 1, 2012, 3:00 PM CST
- In force
- 84 min
- Issued by
- the Storm Prediction Center
All 35 counties
Acadia Parish, LA, Allen Parish, LA, Avoyelles Parish, LA, Beauregard Parish, LA, Calcasieu Parish, LA, Cameron Parish, LA, Evangeline Parish, LA, Grant Parish, LA, Jefferson Davis Parish, LA, Lafayette Parish, LA, LaSalle Parish, LA, Natchitoches Parish, LA, Rapides Parish, LA, Sabine Parish, LA, Saint Landry Parish, LA, Vermilion Parish, LA, Vernon Parish, LA, Winn Parish, LA, Angelina County, TX, Chambers County, TX, Galveston County, TX, Hardin County, TX, Jasper County, TX, Jefferson County, TX, Liberty County, TX, Nacogdoches County, TX, Newton County, TX, Orange County, TX, Polk County, TX, Sabine County, TX, San Augustine County, TX, San Jacinto County, TX, Shelby County, TX, Trinity County, TX, Tyler County, TX
The nearest sounding before it
Lake Charles Mun, LA (KLCH), launched 12:00Z, 7.6 hours before the alert went out and 83 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
- 717 J/kg
- Mixed-layer CIN
- -10 J/kg
- Mixed-layer LCL
- 525 m above ground
- 0-6 km bulk shear
- 30 kt
- 0-1 km storm-relative helicity
- 95 m²/s²
- 0-3 km storm-relative helicity
- 146 m²/s²
- Significant tornado parameter
- 0.3
- Supercell composite
- 3.5
The text
As transmitted, in the capitals the NWS used until 2016.
508
ACUS11 KWNS 011937
SWOMCD
SPC MCD 011936
LAZ000-TXZ000-012100-
MESOSCALE DISCUSSION 0086
NWS STORM PREDICTION CENTER NORMAN OK
0136 PM CST WED FEB 01 2012
AREAS AFFECTED...PORTIONS OF SERN TX AND SWRN LA
CONCERNING...SEVERE POTENTIAL...WATCH UNLIKELY
VALID 011936Z - 012100Z
THUNDERSTORMS WILL INCREASE IN COVERAGE ACROSS SERN TX INTO SWRN LA
THIS AFTERNOON. WHILE THESE STORMS MAY PRODUCE SMALL HAIL AND GUSTY
WINDS...WIDESPREAD SEVERE WEATHER IS NOT EXPECTED AT THIS TIME.
TEMPERATURES HAVE WARMED INTO THE UPPER 60S TO MID 70S EARLY THIS
AFTERNOON AS BREAKS IN CLOUDS HAVE ALLOWED SURFACE
HEATING/DESTABILIZATION. WITH DEWPOINTS IN THE MID 60S TO NEAR
70...SBCAPE VALUES RANGE FROM 1500-2000 J/KG. LATEST VISIBLE
SATELLITE INDICATED A LARGE...AGITATED CU FIELD ACROSS SERN TX INTO
SWRN LA WITH A LINE OF THUNDERSTORMS FROM NEAR GLS TO ACP. NORTH OF
THIS LINE OF STORMS...SATELLITE AND RADAR INDICATED OTHER ACTIVITY
TRYING TO DEVELOP IN THE UNSTABLE AIR MASS. GIVEN LACKLUSTER MID
LEVEL LAPSE RATES /NEAR 6 C/KM PER LATEST MESOANALYSIS/ AND THAT THE
STRONGEST FORCING FOR ASCENT WILL REMAIN NORTH OF THE AREA...UPDRAFT
STRENGTH IS NOT EXPECTED TO BE STRONG ENOUGH TO SUPPORT LARGE HAIL
GROWTH AND/OR STRONG WINDS. THEREFORE...A WATCH IS NOT CURRENTLY
EXPECTED AT THIS TIME.
..LEITMAN.. 02/01/2012
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...JAN...LCH...SHV...HGX...
LAT...LON 32009353 31869488 30949532 29669523 29189486 29589299
29719236 30369179 31619198 32029244 32009353SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Feb 1, 1:06 AM CST | Mesoscale Discussion | SPC | Acadia, Allen, Avoyelles, Calcasieu, Cameron, East Feliciana and 5 more | 114 min |
| Feb 1, 10:18 AM CST | Mesoscale Discussion | SPC | Bienville, Bossier, Caddo, Claiborne, De Soto, Jackson and 6 more | 117 min |
| Feb 1, 12:37 PM CST | Severe Thunderstorm Watch | SPC | Bienville, Bossier, Caddo, Claiborne, Lincoln, Union and 1 more | 5 hr |
| Feb 1, 1:22 PM CST | Mesoscale Discussion | SPC | Bossier, Caddo, Claiborne, Union, Webster | 113 min |
| Feb 1, 2:58 PM CST | Mesoscale Discussion | SPC | Bienville, Bossier, Claiborne, Lincoln, Morehouse, Union and 2 more | 2 hr |
| Feb 1, 3:45 PM CST | Severe Thunderstorm Watch | SPC | East Carroll, Morehouse, West Carroll | 3 hr |
| Feb 1, 5:18 PM CST | Mesoscale Discussion | SPC | Ascension, Livingston, Orleans, Saint Charles, Saint James, Saint John the Baptist and 2 more | 87 min |
Nearby
Mesoscale Discussions in Louisiana, 2012Mesoscale 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.