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HURRICANE LENNY INTERMEDIATE ADVISORY NUMBER  18B
NATIONAL WEATHER SERVICE MIAMI FL
9 PM AST WED NOV 17 1999

...ISLANDS OF THE NORTHEASTERN CARIBBEAN EXPECTED TO BE HIT 
HARD BY EXTREMELY DANGEROUS HURRICANE LENNY...
 
...ALL PREPARATIONS AGAINST THIS EXTREMELY DANGEROUS HURRICANE
SHOULD BE COMPLETED....
 
A HURRICANE WARNING REMAINS IN EFFECT FOR CULEBRA...VIEQUES...
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. A TROPICAL STORM 
WARNING IS IN EFFECT FOR MAINLAND PUERTO RICO.
 
AT 9 PM AST...0100Z...THE EYE OF HURRICANE LENNY WAS LOCATED NEAR
LATITUDE 17.7 NORTH...LONGITUDE  64.1 WEST OR ABOUT 70 MILES...
115 KM...WEST-SOUTHWEST OF ST. MAARTEN IN THE NORTHEAST CARIBBEAN. 
 
LENNY HAS BEEN DRIFTING EAST-NORTHEAST THE LAST FEW HOURS BUT A
GENERAL NORTHEAST MOTION IS EXPECTED TO RESUME LATER TONIGHT. THIS
TRACK WILL BRING THE CORE OF EXTREMELY DANGEROUS HURRICANE LENNY
ACROSS THE WARNING AREA TONIGHT.  WEATHER CONDITIONS WILL CONTINUE
TO DETERIORATE THROUGH THE EVENING.

MAXIMUM SUSTAINED WINDS REMAIN NEAR 150 MPH...240 KM/HR...WITH
HIGHER GUSTS ESPECIALLY OVER UNPROTECTED SOUTH AND WEST FACING
HARBORS.  STRONGER SUSTAINED WINDS COULD BE EXPERIENCED IN
MOUNTAINOUS AREAS.  LENNY IS VERY CLOSE TO CATEGORY 5 STATUS ON 
THE SAFFIR/SIMPSON HURRICANE SCALE. SOME FLUCTUATIONS IN INTENSITY
ARE EXPECTED DURING THE NEXT 24 HOURS. 
 
HURRICANE FORCE WINDS EXTEND OUTWARD UP TO  70 MILES...110 KM...
FROM THE CENTER...AND TROPICAL STORM FORCE WINDS EXTEND OUTWARD
UP TO 205 MILES...335 KM.  AMATEUR RADIO OPERATORS ON SABA RECENTLY
REPORTED A WIND GUST TO 68 MPH...109 KPH.

THE LATEST MINIMUM CENTRAL PRESSURE REPORTED BY AN AIR FORCE RESERVE
HURRICANE HUNTER AIRCRAFT WAS 939 MB...27.73 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 PM AST POSITION...17.7 N... 64.1 W.  MOVEMENT...
DRIFTING EAST-NORTHEAST.  MAXIMUM SUSTAINED WINDS...150 MPH. 
MINIMUM CENTRAL PRESSURE... 939 MB.
 
THE NEXT ADVISORY WILL BE ISSUED BY THE NATIONAL HURRICANE CENTER 
AT 11 PM AST.
 
GUINEY
 
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