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Advisory - Tropical System Nine

TROPICAL STORM IAN INTERMEDIATE ADVISORY NUMBER 6A
NWS NATIONAL HURRICANE CENTER MIAMI FL       AL092022
200 PM EDT SAT SEP 24 2022

...IAN EXPECTED TO RAPIDLY STRENGTHEN LATER THIS WEEKEND...


SUMMARY OF 200 PM EDT...1800 UTC...INFORMATION
----------------------------------------------
LOCATION...14.2N 75.8W
ABOUT 270 MI...435 KM SSE OF KINGSTON JAMAICA
ABOUT 505 MI...810 KM SE OF GRAND CAYMAN
MAXIMUM SUSTAINED WINDS...45 MPH...75 KM/H
PRESENT MOVEMENT...W OR 260 DEGREES AT 16 MPH...26 KM/H
MINIMUM CENTRAL PRESSURE...1003 MB...29.62 INCHES


WATCHES AND WARNINGS
--------------------
CHANGES WITH THIS ADVISORY:

THE GOVERNMENT OF THE CAYMAN ISLANDS HAS UPGRADED THE HURRICANE 
WATCH TO A HURRICANE WARNING FOR GRAND CAYMAN, AND HAS CHANGED THE 
HURRICANE WATCH TO A TROPICAL STORM WATCH FOR LITTLE CAYMAN AND 
CAYMAN BRAC.

SUMMARY OF WATCHES AND WARNINGS IN EFFECT:

A HURRICANE WARNING IS IN EFFECT FOR...
* GRAND CAYMAN

A TROPICAL STORM WATCH IS IN EFFECT FOR...
* JAMAICA
* LITTLE CAYMAN AND CAYMAN BRAC

A HURRICANE WARNING MEANS THAT HURRICANE CONDITIONS ARE EXPECTED
SOMEWHERE WITHIN THE WARNING AREA.  A WARNING IS TYPICALLY ISSUED
36 HOURS BEFORE THE ANTICIPATED FIRST OCCURRENCE OF
TROPICAL-STORM-FORCE WINDS, CONDITIONS THAT MAKE OUTSIDE
PREPARATIONS DIFFICULT OR DANGEROUS.  PREPARATIONS TO PROTECT LIFE
AND PROPERTY SHOULD BE RUSHED TO COMPLETION.

A TROPICAL STORM WATCH MEANS THAT TROPICAL STORM CONDITIONS ARE
POSSIBLE WITHIN THE WATCH AREA, GENERALLY WITHIN 48 HOURS.

INTERESTS IN WESTERN AND CENTRAL CUBA, THE FLORIDA KEYS, AND THE
FLORIDA PENINSULA SHOULD MONITOR THE PROGRESS OF IAN.

FOR STORM INFORMATION SPECIFIC TO YOUR AREA, PLEASE MONITOR
PRODUCTS ISSUED BY YOUR NATIONAL METEOROLOGICAL SERVICE.


DISCUSSION AND OUTLOOK
----------------------
AT 200 PM EDT (1800 UTC), THE CENTER OF TROPICAL STORM IAN WAS 
LOCATED NEAR LATITUDE 14.2 NORTH, LONGITUDE 75.8 WEST. IAN IS MOVING 
TOWARD THE WEST NEAR 16 MPH (26 KM/H), AND THIS GENERAL MOTION IS 
EXPECTED TO CONTINUE THROUGH TONIGHT. A TURN TOWARD THE NORTHWEST IS 
FORECAST ON SUNDAY, FOLLOWED BY A NORTH-NORTHWESTWARD TURN ON MONDAY 
AND A NORTHWARD MOTION ON TUESDAY. ON THE FORECAST TRACK, THE CENTER 
OF IAN IS FORECAST TO PASS SOUTHWEST OF JAMAICA ON SUNDAY, AND PASS 
NEAR THE CAYMAN ISLANDS SUNDAY NIGHT AND EARLY MONDAY. IAN WILL THEN 
APPROACH WESTERN CUBA LATE MONDAY AND EMERGE OVER THE SOUTHEASTERN 
GULF OF MEXICO ON TUESDAY.

MAXIMUM SUSTAINED WINDS REMAIN NEAR 45 MPH (75 KM/H) WITH HIGHER
GUSTS. SIGNIFICANT STRENGTHENING IS FORECAST DURING THE NEXT FEW
DAYS. IAN IS EXPECTED TO BECOME A HURRICANE LATE SUNDAY OR SUNDAY
NIGHT AND COULD BE AT OR NEAR MAJOR HURRICANE STRENGTH LATE MONDAY
WHEN IT APPROACHES WESTERN CUBA.

TROPICAL-STORM-FORCE WINDS EXTEND OUTWARD UP TO 60 MILES (95 KM)
FROM THE CENTER.

THE ESTIMATED MINIMUM CENTRAL PRESSURE IS 1003 MB (29.62 INCHES).


HAZARDS AFFECTING LAND
----------------------
KEY MESSAGES FOR IAN CAN BE FOUND IN THE TROPICAL CYCLONE DISCUSSION
UNDER AWIPS HEADER MIATCDAT4 AND WMO HEADER WTNT44 KNHC AND ON THE
WEB AT HURRICANES.GOV/TEXT/MIATCDAT4.SHTML.

WIND:  HURRICANE CONDITIONS ARE EXPECTED TO REACH GRAND CAYMAN BY 
EARLY MONDAY, WITH TROPICAL STORM CONDITIONS EXPECTED BY SUNDAY 
NIGHT. TROPICAL STORM CONDITIONS ARE POSSIBLE ON JAMAICA BY SUNDAY, 
AND ON LITTLE CAYMAN AND CAYMAN BRAC BY SUNDAY NIGHT.  

RAINFALL: IAN IS EXPECTED TO PRODUCE THE FOLLOWING RAINFALL:

SOUTHERN HAITI AND SOUTHERN DOMINICAN REPUBLIC: 2 TO 4 INCHES, WITH
LOCAL MAXIMA UP TO 6 INCHES

JAMAICA AND THE CAYMAN ISLANDS: 4 TO 8 INCHES, WITH LOCAL MAXIMA UP
TO 12 INCHES

WESTERN TO CENTRAL CUBA: 6 TO 10 INCHES, WITH LOCAL MAXIMA UP TO 14
INCHES

FLORIDA KEYS AND SOUTH FLORIDA: 1 TO 3 INCHES, WITH LOCAL MAXIMA UP
TO 5 INCHES THROUGH TUESDAY MORNING

THESE RAINS MAY PRODUCE FLASH FLOODING AND MUDSLIDES IN AREAS OF
HIGHER TERRAIN, PARTICULARLY OVER JAMAICA AND CUBA. FLASH AND URBAN
FLOODING IS POSSIBLE WITH RAINFALL ACROSS THE FLORIDA KEYS AND THE
FLORIDA PENINSULA THROUGH MID NEXT WEEK. ADDITIONAL FLOODING AND
RISES ON AREA STREAMS AND RIVERS ACROSS FLORIDA CANNOT BE RULED OUT
THROUGH NEXT WEEK GIVEN ALREADY SATURATED ANTECEDENT CONDITIONS.

STORM SURGE: STORM SURGE COULD RAISE WATER LEVELS BY AS MUCH AS 2 TO
4 FEET ABOVE NORMAL TIDE LEVELS ALONG THE IMMEDIATE COAST IN AREAS
OF ONSHORE WINDS IN THE CAYMAN ISLANDS SUNDAY NIGHT INTO MONDAY.

LOCALIZED COASTAL FLOODING IS POSSIBLE ALONG THE COAST OF JAMAICA IN
AREAS OF ONSHORE WINDS ON SUNDAY.

SURF: SWELLS GENERATED BY IAN WILL BEGIN AFFECTING JAMAICA AND THE
CAYMAN ISLANDS ON SUNDAY AND SPREAD WESTWARD TO CUBA BY MONDAY.
THESE SWELLS ARE LIKELY TO CAUSE LIFE-THREATENING SURF AND RIP
CURRENT CONDITIONS. PLEASE CONSULT PRODUCTS FROM YOUR LOCAL WEATHER
OFFICE.


NEXT ADVISORY
-------------
NEXT COMPLETE ADVISORY AT 500 PM EDT.

$$
FORECASTER REINHART

Tropical Storm Nine
Latitude 14.2N
Longitude 75.8W
Maximum Winds 45 MPH
Pressure 1003 MB
Direction/Speed W @ 16 MPH

Last Updated: 200 PM EDT



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