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HURRICANE LENNY INTERMEDIATE ADVISORY NUMBER 17B
NATIONAL WEATHER SERVICE MIAMI FL
3 PM AST WED NOV 17 1999
 
...LENNY STRENGTHENING EVEN MORE...REACHES 150 MPH WINDS...NORTHERN
EYEWALL NEAR ST. CROIX...

...ALL PREPARATIONS AGAINST THIS EXTREMELY DANGEROUS HURRICANE
SHOULD BE COMPLETED.... 

A HURRICANE WARNING REMAINS IN EFFECT FOR PUERTO RICO AND THE U.S.
AND BRITISH VIRGIN ISLANDS.  A HURRICANE WARNING IS ALSO IN EFFECT
FOR DUTCH ST. MAARTEN...FRENCH ST. MARTIN...ST. BARTHELEMEY...
ANGUILLA...SABA...ST. EUSTATIUS...ST. KITTS...NEVIS...MONTSERRAT...
ANTIGUA...AND BARBUDA.

THE HURRICANE WARNING FOR MAINLAND PUERTO RICO...NOT INCLUDING
VIEQUES AND CULEBRA...MAY BE DOWNGRADED LATER TODAY IF THE HURRICANE
CONTINUES ON A NORTHEAST TRACK.
 
AT 3 PM AST...1900Z...THE EYE OF HURRICANE LENNY WAS LOCATED BY
PLANE AND RADAR NEAR LATITUDE 17.5 NORTH...LONGITUDE  64.7 WEST...
JUST TO THE SOUTH OF ST. CROIX.
 
LENNY IS MOVING TOWARD THE NORTHEAST NEAR 12 MPH...19 KM/HR OR A
LITTLE BIT SLOWER.  ON THIS TRACK...THE CORE OF POWERFUL HURRICANE
LENNY WILL BE CROSSING THE WARNING AREA LATER TODAY.  WEATHER
CONDITIONS WILL CONTINUE TO WORSEN OVER THE WARNING AREA.

MAXIMUM SUSTAINED WINDS HAVE INCREASED TO NEAR 150 MPH...240 KM/HR
...WITH HIGHER GUSTS ESPECIALLY OVER UNPROTECTED SOUTH AND WEST
FACING HARBORS.  LENNY IS VERY CLOSE TO BE A CATEGORY 5 HURRICANE ON
THE SAFFIR/SIMPSON HURRICANE SCALE. STRONGER WINDS COULD BE
EXPERIENCED IN MOUNTAINOUS AREAS.  SOME FLUCTUATIONS IN INTENSITY
ARE EXPECTED DURING THE NEXT 24 HOURS.
 
HURRICANE FORCE WINDS EXTEND OUTWARD UP TO  60 MILES... 95 KM...
FROM THE CENTER...AND TROPICAL STORM FORCE WINDS EXTEND OUTWARD UP
TO 175 MILES...280 KM.  ST. CROIX JUST EXPERIENCED SUSTAINED WINDS
OF 83 MPH...133 KPH AND GUSTS TO 112 MPH...180 KPH.  ST. JOHN JUST
REPORTED GUSTS TO 86 MPH...138 KPH.   
  
A RECONNAISSANCE PLANE RECENTLY MEASURED A MINIMUM CENTRAL PRESSURE
OF 936 MB...27.64 INCHES.
 
RAINFALL TOTALS OF 10 TO 15 INCHES...WITH LOCALLY HIGHER AMOUNTS IN
MOUNTAINOUS REGIONS ARE ASSOCIATED WITH THE HURRICANE.  THESE RAINS
CAN PRODUCE LIFE-THREATENING FLASH FLOODS AND MUD SLIDES.  SAN JUAN
DOPPLER RADAR SHOWS HEAVY RAINS CONTINUING TO SPREAD OVER PORTIONS
OF PUERTO RICO...THE VIRGIN ISLANDS...AND THE NORTHERN LEEWARD
ISLANDS.
 
ISOLATED TORNADOES ARE POSSIBLE OVER THE WARNING AREA.
 
STORM SURGE FLOODING OF 5 TO 8 FT ABOVE NORMAL...ACCOMPANIED BY
LARGE AND DANGEROUS BATTERING WAVES...IS EXPECTED NEAR THE CENTER IN
THE WARNED AREA.
 
REPEATING THE 3 PM AST POSITION...17.5 N... 64.7 W.  MOVEMENT
TOWARD...NORTHEAST NEAR 12 MPH.  MAXIMUM SUSTAINED WINDS...150 MPH. 
MINIMUM CENTRAL PRESSURE...936 MB.
 
THE NEXT ADVISORY WILL BE ISSUED BY THE NATIONAL HURRICANE CENTER AT
5 PM AST.
 
AVILA
 
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