SWOMCD
SPC MCD 192351
ALZ000-200045-
MESOSCALE DISCUSSION 0530
NWS STORM PREDICTION CENTER NORMAN OK
0651 PM CDT SUN APR 19 2009
AREAS AFFECTED...MUCH OF CNTRL AND SRN AL
CONCERNING...TORNADO WATCH 173...
VALID 192351Z - 200045Z
THE SEVERE WEATHER THREAT FOR TORNADO WATCH 173 CONTINUES.
THREAT FOR ISOLATED TORNADOES...LARGE HAIL AND DAMAGING WIND WILL
PERSIST THROUGH EARLY EVENING. SEVERE THREAT MAY SHIFT A LITTLE
FARTHER EAST OF CURRENT WW AND AS A RESULT...WW 173 HAS BEEN
EXTENDED EAST A FEW COUNTIES INTO ERN AL.
SCATTERED SUPERCELLS CONTINUE ALONG AND EAST OF A PRE-FRONTAL
CONVERGENCE AXIS THAT EXTENDS FROM MIDDLE TN THROUGH WRN AL. ZONE OF
GREATER INSTABILITY WITH MLCAPE FROM 500-1000 J/KG EXTENDS FROM ERN
MS THROUGH THE WRN HALF AL AND CORRESPONDS TO AXIS OF HIGHER
BOUNDARY LAYER MOISTURE WITH LOW-MID 60S DEWPOINTS. SOME OF THE
STORMS ARE APPROACHING THE ERN EDGE OF WW 173 ACROSS ERN AL WHERE
INSTABILITY AND MOISTURE ARE MORE LIMITED. SWLY LOW LEVEL JET WILL
PERSIST ACROSS AL DURING THE EVENING. THIS MAY CONTRIBUTE TO MOIST
ADVECTION AND MODEST DESTABILIZATION OVER ERN AL NEXT FEW HOURS
WHERE LOW LEVEL HODOGRAPHS AND BULK SHEAR WILL CONTINUE TO SUPPORT
SUPERCELLS. THE SEVERE THREAT IS EXPECTED TO WANE BY MID TO LATE
EVENING AS THE BOUNDARY LAYER BEGINS TO COOL AND THE LOW LEVEL JET
SHIFTS FARTHER NE INTO THE SRN APPALACHIANS WHERE INSTABILITY WILL
REMAIN MUCH MORE LIMITED.
..DIAL.. 04/19/2009
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...BMX...MOB...
LAT...LON 33698547 31898539 30868821 32858763 33698547
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