SWOMCD
SPC MCD 190133
FLZ000-ALZ000-MSZ000-LAZ000-190230-
MESOSCALE DISCUSSION 0663
NWS STORM PREDICTION CENTER NORMAN OK
0833 PM CDT FRI APR 18 2008
AREAS AFFECTED...SERN MS/SERN LA/SWRN AL/FAR WRN FL PANHANDLE
CONCERNING...TORNADO WATCH 207...208...
VALID 190133Z - 190230Z
THE SEVERE WEATHER THREAT FOR TORNADO WATCH 207...208...CONTINUES.
PARAMETERS /LOW LEVEL SPEED AND DIRECTIONAL SHEAR PER AREA WSR-88D
VWPS AND 00Z SLIDELL SOUNDING/ REMAIN FAVORABLE FOR A CONTINUED
TORNADO THREAT AS STORMS TRACK ENEWD ACROSS SERN MS INTO SWRN AL.
50 KT SSWLY LLJ HAS BEGUN TO TRANSLATE EWD INTO AL WITH WSR-88D VWP
AT MOB INDICATING SLY 50 KT FLOW AT 1 KM AGL. THIS INCREASE IN SLY
FLOW WILL MAINTAIN MOISTURE ADVECTION INTO SWRN AL/FAR WRN FL
PANHANDLE WITH ADDITIONAL DESTABILIZATION EXPECTED AS HAS ALREADY
OCCURRED PER OBJECTIVE ANALYSES /MUCAPE 500-1000 J/KG IN FAR SWRN AL
AND 100-500 J/KG ACROSS NRN PART OF WW 208/. 50 KT WLY EFFECTIVE
SHEAR VECTORS CONTINUE TO SUPPORT SUPERCELL/DISCRETE STRUCTURES
ACROSS SERN MS EWD INTO WW 208...WITH 0-1 KM SRH AT MOB IN EXCESS OF
300 M2/S2.
..PETERS.. 04/19/2008
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...TAE...BMX...MOB...JAN...LIX...
28859101 30089009 31078933 31858891 32878886 32918833
32828802 32168776 32068689 31068654 30988637 30008642
29788776 29088856 28638891 28518945
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