MESO: Mesoscale Discussion 2146

ACUS11 KWNS 100524
SWOMCD
SPC MCD 100524
MSZ000-LAZ000-ARZ000-TXZ000-100630-

MESOSCALE DISCUSSION 2146
NWS STORM PREDICTION CENTER NORMAN OK
1124 PM CST SUN DEC 09 2012

AREAS AFFECTED...SWRN THROUGH NERN LA INTO WCNTRL MS

CONCERNING...SEVERE THUNDERSTORM WATCH 678...

VALID 100524Z - 100630Z

THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 678
CONTINUES.

SUMMARY...SEVERE THUNDERSTORM WATCH 678 WILL BE ALLOWED TO EXPIRE AT
06Z. THE PRIMARY...BUT LIMITED SEVERE THREAT IN THE MEANTIME WILL
EXIST WITH PORTION OF SQUALL LINE MOVING INTO WCNTRL MS.

DISCUSSION...SQUALL LINE EXTENDS FROM WCNTRL MS SWWD THROUGH SWRN
LA. THE MORE PROGRESSIVE PORTION OF THE LINE REMAINS ON NRN END OVER
WCNTRL MS. RADAR DATA FROM JACKSON STILL SHOW A FEW BOWING ELEMENTS.
AT LEAST A MODEST THREAT FOR ISOLATED DAMAGING WIND WILL PERSIST
NEXT HOUR OR TWO AS ACTIVITY FORWARD PROPAGATES THROUGH AN
ENVIRONMENT CHARACTERIZED BY 40-50 KT UNIDIRECTIONAL EFFECTIVE SHEAR
BUT MODEST INSTABILITY.

FARTHER SW ACROSS LA...THE SQUALL LINE HAS BECOME ORIENTED NEARLY
PARALLEL TO THE MEAN WIND...RESULTING IN LIMITED SEWD PROPAGATION
AND A MORE MARGINAL SEVERE THREAT.

..DIAL.. 12/10/2012

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

ATTN...WFO...JAN...LCH...SHV...

LAT...LON 30939435 32569165 33339087 33058988 32059040 30429388
30939435

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