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HURRICANE LENNY INTERMEDIATE ADVISORY NUMBER  16B
NATIONAL WEATHER SERVICE MIAMI FL
9 AM AST WED NOV 17 1999
 
...LENNY BECOMES A CATEGORY FOUR HURRICANE ON THE SAFFIR/SIMPSON
HURRICANE SCALE...THE FIFTH OF THE SEASON...NEARING THE NORTHEASTERN
CARIBBEAN ISLANDS...

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.
 
AT 9 AM AST...1300Z...THE CENTER OF HURRICANE LENNY WAS LOCATED NEAR
LATITUDE 16.9 NORTH...LONGITUDE  65.4 WEST OR ABOUT 115 MILES...185
KM...SOUTH SOUTHEAST OF SAN JUAN PUERTO RICO. THIS IS ALSO ABOUT 70
MILES...110 KM...SOUTHWEST OF ST. CROIX.
 
LENNY IS MOVING TOWARD THE EAST-NORTHEAST NEAR 13 MPH...21 KM/HR A
GRADUAL TURN TO THE NORTHEAST IS EXPECTED TODAY. 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 THIS MORNING.
 
MAXIMUM SUSTAINED WINDS HAVE INCREASED TO NEAR 135 MPH...215 KM/HR
...WITH HIGHER GUSTS ESPECIALLY OVER UNPROTECTED SOUTH AND WEST
FACING HARBORS.   LENNY HAS BECOME A DANGEROUS CATEGORY 4 HURRICANE
ON THE SAFFIR/SIMPSON HURRICANE SCALE...THE FIFTH OF THE 1999
SEASON.  STRONGER WINDS COULD BE EXPERIENCED IN MOUNTAINOUS
AREAS.  SOME FURTHER STRENGTHENING IS POSSIBLE TODAY.
 
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 HAS BEEN EXPERIENCING SUSTAINED
TROPICAL STORM FORCE WINDS DURING THE PAST HOUR WITH A RECENT PEAK
GUST OF 62 MPH...100 KPH AND SABA REPORTED A WIND GUST 48 MPH...77
KPH.
 
THE LATEST MINIMUM CENTRAL PRESSURE REPORTED BY AN AIR FORCE RESERVE
HURRICANE HUNTER AIRCRAFT WAS 948 MB...27.99 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 9 AM AST POSITION...16.9 N... 65.4 W.  MOVEMENT
TOWARD...EAST-NORTHEAST NEAR 13 MPH.  MAXIMUM SUSTAINED WINDS...
135 MPH.  MINIMUM CENTRAL PRESSURE... 948 MB.
 
THE NEXT ADVISORY WILL BE ISSUED BY THE NATIONAL HURRICANE CENTER AT
11 AM AST.
 
AVILA
 
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