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FXUS62 KTBW 121828
AFDTBW
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE TAMPA BAY RUSKIN FL
228 PM EDT THU APR 12 2007
.SHORT TERM (TONIGHT - SATURDAY)...MODELS CONTINUE IN FAIRLY GOOD
AGREEMENT THROUGH THE PERIOD. WEAK UPPER RIDGING BUILDS OVER THE
GULF TONIGHT AND THEN SLIDES EAST ACROSS FL REACHING THE ATLANTIC
SAT. FRONTAL BOUNDARY PUSHING SOUTH ACROSS CENTRAL FL THIS AFTERNOON
WILL EXIT TO THE SOUTH TONIGHT AS HIGH PRESSURE RIDGES OUT OF THE
PLAINS AND INTO THE GULF. THIS SURFACE RIDGE MOVES EAST TO THE SE
U.S. FRI NIGHT AND OUT OVER THE ATLANTIC COASTAL WATERS DURING SAT
AS A ROBUST LOOKING SYSTEM MOVES INTO THE SOUTHERN PLAINS AND WESTERN
GULF.
THE UPPER RIDGE WILL SUPPRESS PCPN AND PROVIDE SUNNY TO MOSTLY SUNNY
AND WARM AFTERNOONS...MAXES WILL BE ABOVE NORMAL BY SOME 2 TO 4
DEGREES. THE SURFACE HIGH WILL KEEP A DRY AND COOL NORTH TO NE FLOW
INTO FRI. AS THE HIGH MOVES BY TO THE NORTH FRI NIGHT THE LOW LEVEL
FLOW TURNS TO MORE EAST AND SE...ALLOWING MINS TO WARM SOME AND THE
ATMOSPHERE TO MOISTEN. FLOW SHIFTS TO SOUTHERN WITH INCREASING
MOISTURE SAT AS THE NEXT SYSTEM APPROACHES. SO IT GOES.
.LONG TERM (SAT NIGHT-WED)...CONDITIONS CONTINUE TO SET UP FOR A
HAZARDOUS EVENT SOMETIME BETWEEN SATURDAY NIGHT AND SUNDAY
MORNING. UNUSUALLY STRONG SPRING STORM (LOW PRESSURE) WILL RAPIDLY
DEEPEN ON ITS TRACK FROM THE NORTHERN GULF COAST NORTHEAST THROUGH
THE MID ATLANTIC COAST SATURDAY NIGHT THROUGH SUNDAY MORNING...AND
ASSOCIATED FRONT WILL SWEEP THROUGH THE PENINSULA SUNDAY PRECEDED
BY A SQUALL LINE WHICH WILL HAVE PLENTY OF POTENCY AND COULD WELL
PRODUCE SEVERE WEATHER (DAMAGING WINDS AND ISOLATED TORNADOES)
ACROSS A LARGE AREA. IN ADDITION...STRONG SOUTH/SOUTHWEST FLOW
WILL KICK UP RIP CURRENTS AND SOME HIGH SURF PERHAPS AS SOON AS
LATE SATURDAY...AND DEPENDING ON TIME OF HIGH TIDE WE`LL NEED TO
CLOSELY EXAMINE POTENTIAL FOR A SURGE-LIKE COASTAL FLOOD.
THE ATMOSPHERE SHOULD HAVE NO TROUBLE BECOMING CONDITIONALLY
UNSTABLE AS DEW POINTS WILL RISE INTO THE LOWER 70S AHEAD OF THE
FRONT.
FOR ALL USERS...PLEASE STAY TUNED PARTICULARLY FRIDAY WHEN WE HOPE
TO GET MORE DETAILS OUT ON POTENTIAL HAZARDS WITH THIS EVENT.
AFTER THE LINE PASSES...A BRIEF LULL WILL BE FOLLOWED BY STRONG WEST
TO NORTHWEST FLOW WHICH TURNS MORE NORTHERLY BY SUNDAY NIGHT. WITH
CONDITIONS A BIT SLOWER TO COOL GIVEN STILL HIGH THICKNESS AND 850
TEMPS...EXPECT GUSTY WINDS TO TRANSLATE TO THE SURFACE AND WILL CALL
SUNDAY "WINDY" THOUGH CONDITIONS EVERYWHERE BY MID AFTERNOON SHOULD
BE MOSTLY SUNNY.
MONDAY AND TUESDAY WILL SEE CALMER CONDITIONS THOUGH AFTERNOON WINDS
MAY GUST FROM TIME TO TIME. WILL REMAIN SOMEWHAT ELEVATED. PLENTY
OF SUNSHINE WITH TEMPERATURES A FEW DEGREES BELOW NORMAL BUT STILL
PLEASANT. CERTAINLY A LOT NICER HERE THAN ACROSS THE NORTHEAST AND
MID ATLANTIC STATES WHERE A NASTY "NOR`EASTER" WILL CONTINUE TO
RAGE.
WEDNESDAY CONTINUES TO BE TOUCH AND GO. 12Z GFS NOW SHOWS A
"CLIPPER" TYPE LOW RACING THROUGH THE CENTRAL PENINSULA WITH PERHAPS
A RATHER COOL...THOUGH BRIEF...PERIOD OF RAIN NORTH OF TAMPA BAY.
THIS SAID...ALL IT WOULD TAKE IS A SLIGHT SOUTHWEST TILT TO THE MEAN
STEERING FLOW AND THE LOW WOULD FORM FARTHER NORTH...POTENTIALLY
PLACING SOME OF THE AREA IN A STRONG THUNDERSTORM THREAT. WITH
DEEPER INFLUX OF MOISTURE LACKING...WILL HANDLE WITH SLIGHT CHANCES
INTO WEDNESDAY EVENING. NEXT THURSDAY LOOKS TO BE FAIR WITH STILL
SLIGHTLY BELOW NORMAL TEMPERATURES.
&&
.FIRE WEATHER...HAVE UPDATED LEVY COUNTY TO A RED FLAG THIS
AFTERNOON. ON FRI THE DRY AIR SETTLES IN OVER THE NORTHERN
COUNTIES DOWN TO PASCO WITH A WATCH UPGRADED TO A RED FLAG.
A WATCH CONTINUES FOR PARTS OF THE CENTRAL CWFA.
&&
.MARINE...NW WINDS 15KT OR LESS VEER AROUND TO SOUTHERLY/ BUT WITH
A SEA BREEZE NEAR SHORE FRI AFTERNOON/ BY SAT AND INCREASE TO PERHAPS
SCA LEVELS IN THE AFTERNOON. CURRENT TIMING OF THE FRONT ACROSS THE
COASTAL WATERS IS A SAT NIGHT-SUN MORNING WINDOW WITH SW WINDS
BECOMING NW AROUND 20-25KT ALONG WITH SLIGHT CHANCE TO CHANCE TSTMS.
WINDS WILL CONTINUE HAZARDOUS TO SMALL CRAFT INTO AT LEAST PART OF
MONDAY.
&&
.AVIATION...LAST VESTIGE OF LOW BROKEN/OVERCAST RIDING ALONG THE
COAST AND MAY PRODUCE SOME LOW MVFR CEILINGS THROUGH 19 OR 20Z AT
KPIE/KSRQ. OTHERWISE...WEST FLOW AHEAD OF THE WIND SHIFT ACROSS THE
SOUTHWEST TERMINALS SHOULD KEEP PRECIPITATION AWAY AND LEAVE VFR
SCATTERED CLOUDS. AFTER 22Z...DRY AIR SHOULD SURGE ACROSS ALL AREAS
LEAVING VFR CLEAR. SOME MVFR SCATTERED CLOUDS POSSIBLE BY LATE
MORNING FRIDAY ACROSS THE SOUTH TERMINALS...BUT WILL LET LATER
SHIFTS ADJUST.
&&
.PRELIMINARY POINT TEMPS/POPS...
TPA 60 84 68 84 / 5 5 5 5
FMY 64 89 66 87 / 5 5 5 5
GIF 60 87 65 88 / 5 5 5 5
SRQ 62 84 65 84 / 5 5 5 5
BKV 50 86 56 87 / 5 5 5 5
SPG 67 84 70 83 / 5 5 5 5
&&
.TBW WATCHES/WARNINGS/ADVISORIES...
FL...FIRE WEATHER WATCH FROM FRIDAY MORNING THROUGH FRIDAY EVENING
FOR HILLSBOROUGH-PINELLAS-POLK.
RED FLAG WARNING FROM 11 AM TO 8 PM EDT FRIDAY FOR CITRUS-
HERNANDO-LEVY-PASCO-SUMTER.
RED FLAG WARNING UNTIL 8 PM EDT THIS EVENING FOR LEVY.
GULF WATERS...NONE.
&&
$$
SHORT TERM/MARINE...09/RKR