MESO: Mesoscale Discussion 0532

ACUS11 KWNS 200120
SWOMCD
SPC MCD 200119
ALZ000-200215-

MESOSCALE DISCUSSION 0532
NWS STORM PREDICTION CENTER NORMAN OK
0819 PM CDT SUN APR 19 2009

AREAS AFFECTED...CNTRL AL

CONCERNING...TORNADO WATCH 174...

VALID 200119Z - 200215Z

THE SEVERE WEATHER THREAT FOR TORNADO WATCH 174 CONTINUES.

TORNADO WATCH 173 IS SCHEDULED TO EXPIRE AT 02Z. HOWEVER...SEVERE
THREAT IS EXPECTED TO PERSIST A COUPLE HOURS BEYOND THIS TIME...AND
PORTIONS OF WW 173 WILL PROBABLY EITHER NEED TO BE EXTENDED IN TIME
OR REPLACED WITH A NEW WATCH.

WIDELY SCATTERED STORMS INCLUDING SUPERCELLS PERSIST ACROSS CNTRL
AND N-CNTRL AL. NOCTURNAL COOLING SHOULD GRADUALLY STABILIZE THE
BOUNDARY LAYER...AND INSTABILITY WILL BECOME INCREASINGLY MARGINAL
WITH TIME. FURTHERMORE...THE BOUNDARY LAYER FLOW WILL SLOWLY VEER
AND WEAKEN AS THE LOW LEVEL JET SHIFTS NEWD TOWARD THE SRN
APPALACHIANS DURING THE EVENING. WHILE THESE PROCESSES SUGGEST THE
SEVERE THREAT WILL DECREASE LATER THIS EVENING...THEY WILL NOT OCCUR
QUICKLY ENOUGH TO MITIGATE THE SEVERE THREAT BEFORE WW 173 EXPIRES.
IN THE MEANTIME HODOGRAPHS AND INSTABILITY WILL REMAIN SUFFICIENT TO
SUSTAIN THE SEVERE THREAT FOR ANOTHER COUPLE HOURS.

..DIAL.. 04/20/2009

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

ATTN...WFO...BMX...MOB...

LAT...LON 34208570 33228533 32068535 31788682 32638759 33878673
34208570

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