Alert archive / Louisiana / Mesoscale Discussions in 2011

Mesoscale Discussion 6

January 5, 2011Calcasieu Parish, Cameron Parish, Vermilion Parish, Louisiana; Jefferson County, Texas

The Storm Prediction Center issued this mesoscale discussion at Jan 5, 2011, 2:16 AM CST for Calcasieu Parish, Cameron Parish, Vermilion Parish, Louisiana; Jefferson County, Texas. It was in force for 89 min.

The area

The outline as issued.

The facts

Issued: Jan 5, 2011, 2:16 AM CST (08:16 UTC)
Expired: Jan 5, 2011, 3:45 AM CST
In force: 89 min
Issued by: the Storm Prediction Center

Counties Calcasieu Parish, LA, Cameron Parish, LA, Vermilion Parish, LA, Jefferson County, TX

The radar

The Lake Charles radar (KLCH), 44 km from the middle of the area, began a volume at 08:15 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 00:00Z, 8.3 hours before the alert went out and 44 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 747 m above ground
0-6 km bulk shear: 49 kt
0-1 km storm-relative helicity: 13 m²/s²
0-3 km storm-relative helicity: 105 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

353 
ACUS11 KWNS 050817
SWOMCD
SPC MCD 050816
LAZ000-TXZ000-050945-

MESOSCALE DISCUSSION 0006
NWS STORM PREDICTION CENTER NORMAN OK
0216 AM CST WED JAN 05 2011

AREAS AFFECTED...SERN TX INVOF THE SABINE RIVER VALLEY EWD ACROSS
SWRN LA

CONCERNING...SEVERE POTENTIAL...WATCH UNLIKELY

VALID 050816Z - 050945Z

VERY LOW-END/LIMITED SEVERE THREAT IS EVOLVING ACROSS THE DISCUSSION
AREA.  WHILE AN ISOLATED SEVERE WIND GUST OR TWO COULD OCCUR IN
COASTAL COUNTIES/PARISHES...WW IS NOT ANTICIPATED.

LATEST SURFACE MAP SHOWS DEWPOINTS SLOWLY INCREASING ACROSS THE
UPPER TX COAST AND EWD INTO S CENTRAL LA...AS SLY LOW-LEVEL FLOW OFF
THE GULF HAS PUSHED A WARM FRONT INTO COASTAL REGIONS INVOF THE
MOUTH OF THE SABINE RIVER.  THE SLY WARM/MOIST ADVECTION IS IN
RESPONSE TO A SHORT-WAVE TROUGH MOVING ACROSS KS/OK INTO MO
ATTM...WITH THE OVERALL QG FORCING SUFFICIENT FOR SUSTAINED SHOWERS
AND STORMS WITHIN A THERMODYNAMIC ENVIRONMENT FEATURING
WEAK/ELEVATED CAPE.

WHILE STORMS ONSHORE SHOULD REMAIN ROOTED ABOVE A MORE STABLE
SURFACE LAYER...DEEP-LAYER SHEAR IS SUFFICIENT FOR SOME UPDRAFT
ORGANIZATION/LONGEVITY.  GIVEN THIS...AND THE MORE SHALLOW STABLE
LAYER CLOSE TO THE COAST...AN ISOLATED SEVERE GUST PENETRATING TO
THE SURFACE -- OR EVEN A WEAK/BRIEF TORNADO -- WILL BE POSSIBLE.

..GOSS.. 01/05/2011

...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...

ATTN...WFO...LCH...HGX...

LAT...LON   29549428 29769444 30029410 30239355 30289319 29969220
            29469178 29249219 29339314 29549428

Nearby

Mesoscale Discussions in Louisiana, 2011 Mesoscale Discussions in Texas, 2011 Every mesoscale discussion in 2011

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.