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HURRICANE LENNY INTERMEDIATE ADVISORY NUMBER  20B
NATIONAL WEATHER SERVICE MIAMI FL
9 AM AST THU NOV 18 1999

...EXTREMELY DANGEROUS LENNY BARELY MOVING...

A HURRICANE WARNING REMAINS IN EFFECT FOR CULEBRA...VIEQUES...THE
U.S. AND BRITISH VIRGIN ISLANDS. A HURRICANE WARNING ALSO REMAINS IN
EFFECT FOR DUTCH ST. MAARTEN...FRENCH ST. MARTIN...ST.
BARTHELEMEY...ANGUILLA...SABA...ST. EUSTATIUS...ST. KITTS...NEVIS...
MONTSERRAT...ANTIGUA...AND BARBUDA.
 
TROPICAL STORM WARNINGS REMAIN IN EFFECT EAST OF A PONCE-MANATI
LINE...INCLUDING SAN JUAN.
 
ALL INTERESTS ALONG COASTAL SECTIONS OF PUERTO RICO WEST OF A PONCE-
MANATI LINE SHOULD EXERCISE CAUTION UNTIL WINDS AND SEAS SUBSIDE.
 
AT 9 AM AST...1300Z...THE EYE OF HURRICANE LENNY WAS LOCATED NEAR
LATITUDE 17.8 NORTH...LONGITUDE  63.6 WEST OR ABOUT 35 MILES...60
KM...WEST-SOUTHWEST OF ST. MAARTEN.
 
LENNY HAS BEEN NEARLY STATIONARY DURING THE PAST FEW HOURS. HOWEVER
...A SLOW GENERALLY EAST-NORTHEAST MOTION IS EXPECTED TODAY.  THIS
MOTION SHOULD BRING THE EYEWALL OF THE HURRICANE OVER THE ISLANDS OF
SABA...ST. MAARTEN...AND ANGUILLA LATER TODAY.
 
MAXIMUM SUSTAINED WINDS ARE NEAR 135 MPH...215 KM/HR...WITH HIGHER
GUSTS ESPECIALLY OVER UNPROTECTED SOUTH AND WEST FACING HARBORS. 
STRONGER SUSTAINED WINDS COULD BE EXPERIENCED IN MOUNTAINOUS AREAS. 
SOME FLUCTUATIONS IN STRENGTH ARE LIKELY DURING THE NEXT 24 HOURS.
EVEN THOUGH LENNY HAS WEAKENED...IT IS STILL A CATEGORY 4 HURRICANE
ON THE SAFFIR-SIMPSON SCALE. 
 
HURRICANE FORCE WINDS EXTEND OUTWARD UP TO  60 MILES... 95 KM...
FROM THE CENTER...AND TROPICAL STORM FORCE WINDS EXTEND OUTWARD UP
TO 185 MILES...295 KM.

THE LATEST MINIMUM CENTRAL PRESSURE REPORTED BY THE HURRICANE HUNTER
WAS 952 MB...28.11 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 BANDS OF HEAVY RAINS OVER PORTIONS OF PUERTO
RICO...THE VIRGIN ISLANDS...AND THE NORTHERN LEEWARD ISLANDS.
 
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...17.8 N... 63.6 W.  MOVEMENT...
NEARLY STATIONARY.  MAXIMUM SUSTAINED WINDS...135 MPH.  MINIMUM
CENTRAL PRESSURE... 952 MB.
 
THE NEXT ADVISORY WILL BE ISSUED BY THE NATIONAL HURRICANE CENTER AT
11 AM AST.
 
AVILA
 
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