SWOMCD
SPC MCD 190437
ALZ000-FLZ000-190530-
MESOSCALE DISCUSSION 0666
NWS STORM PREDICTION CENTER NORMAN OK
1137 PM CDT FRI APR 18 2008
AREAS AFFECTED...SRN AL/WRN FL PANHANDLE
CONCERNING...TORNADO WATCH 208...
VALID 190437Z - 190530Z
THE SEVERE WEATHER THREAT FOR TORNADO WATCH 208 CONTINUES.
WW 208 WILL BE EXTENDED IN TIME BEYOND SCHEDULED 05Z EXPIRATION BY
WFO MOB.
04Z WSR-88D VWP AT MOB SHOWED LOW LEVEL WINDS HAVE VEERED TO SWLY
WHICH SHOULD CONTINUE TO SHUNT THE INFLUX OF MOISTURE RETURN TO
PRIMARILY THE WRN FL PANHANDLE AND FAR SRN AL OVERNIGHT. DESPITE
THE VEERED WINDS AT MOB...DOWNSTREAM LOW LEVEL WINDS REMAIN BACKED
/SLY/ ACROSS PARTS OF WRN FL PANHANDLE INTO SOUTH CENTRAL/SERN
AL...AND THUS ARE MAINTAINING STRONGER LOW LEVEL SHEAR ACROSS AT
LEAST THE ERN HALF OF WW 208 WITH 0-1 KM SRH GREATER THAN 350 M2/S2.
TSTMS...SUCH AS THE ONE LOCATED IN MONROE/CONECUH COUNTIES AL...THAT
CONTINUE TO DEVELOP SUSTAINED UPDRAFTS AS THEY MOVE EWD THROUGH THIS
ENVIRONMENT WILL POSE AN ISOLATED TORNADO THREAT AND POTENTIAL FOR
STRONGER WIND GUSTS.
OBJECTIVE ANALYSES DURING THE LAST 1-2 HOURS HAVE INDICATED A
DIMINISHING TREND IN AVAILABLE CONVECTIVE INSTABILITY WHICH MAY BE A
RESULT OF THE VEERING LLJ...AND MAY TEND TO MITIGATE FURTHER
DEVELOPMENT DOWNSTREAM OF WW 208.
..PETERS.. 04/19/2008
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...TAE...BMX...MOB...
29868837 30658837 31418775 31918741 31958608 30418629
30068646
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