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Tropical Storm Ian Public Advisory Number 9A

2022-09-25 13:55:18| National Hurricane Center (Atlantic)

Issued at 800 AM EDT Sun Sep 25 2022 000 WTNT34 KNHC 251155 TCPAT4 BULLETIN Tropical Storm Ian Intermediate Advisory Number 9A NWS National Hurricane Center Miami FL AL092022 800 AM EDT Sun Sep 25 2022 ...IAN FORECAST TO BEGIN RAPIDLY STRENGTHENING LATER TODAY... ...RISK OF SIGNIFICANT WIND AND STORM SURGE IMPACTS INCREASING FOR WESTERN CUBA... SUMMARY OF 800 AM EDT...1200 UTC...INFORMATION ---------------------------------------------- LOCATION...15.0N 79.4W ABOUT 320 MI...550 KM SSE OF GRAND CAYMAN ABOUT 590 MI...950 KM SE OF THE WESTERN TIP OF CUBA MAXIMUM SUSTAINED WINDS...50 MPH...85 KM/H PRESENT MOVEMENT...WNW OR 285 DEGREES AT 12 MPH...19 KM/H MINIMUM CENTRAL PRESSURE...1001 MB...29.56 INCHES WATCHES AND WARNINGS -------------------- CHANGES WITH THIS ADVISORY: None. SUMMARY OF WATCHES AND WARNINGS IN EFFECT: A Hurricane Warning is in effect for... * Grand Cayman A Hurricane Watch is in effect for... * Cuban provinces of Isla de Juventud, Pinar del Rio, and Artemisa A Tropical Storm Watch is in effect for... * Little Cayman and Cayman Brac * Cuban provinces of La Habana, Mayabeque, and Matanzas 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 Hurricane Watch means that hurricane conditions are possible within the watch area. A watch is typically issued 48 hours before the anticipated first occurrence of tropical-storm-force winds, conditions that make outside preparations difficult or dangerous. A Tropical Storm Watch means that tropical storm conditions are possible within the watch area, generally within 48 hours. Interests in 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 800 AM EDT (1200 UTC), the center of Tropical Storm Ian was located near latitude 15.0 North, longitude 79.4 West. Ian is moving toward the west-northwest near 12 mph (19 km/h). A turn toward the northwest at a similar forward speed is expected later today, followed by a turn toward the north-northwest on Monday and north on Tuesday. On the forecast track, the center of Ian is forecast to pass well southwest of Jamaica today, and pass near or west of the Cayman Islands early Monday. Ian will then move near or over western Cuba Monday night and early Tuesday and emerge over the southeastern Gulf of Mexico on Tuesday. Maximum sustained winds are near 50 mph (85 km/h) with higher gusts. Rapid strengthening is forecast to begin later today. Ian is expected to become a hurricane later today or tonight and reach major hurricane strength by late Monday or Monday night before it reaches western Cuba. Tropical-storm-force winds extend outward up to 60 miles (95 km) from the center. The estimated minimum central pressure is 1001 mb (29.56 inches) based on NOAA Hurricane Hunter dropsonde data. 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 tonight. Tropical storm conditions are possible on Little Cayman and Cayman Brac by tonight or early Monday. Hurricane conditions are possible within the hurricane watch area in Cuba by Monday night or early Tuesday, with tropical storm conditions possible by late Monday. Tropical storm conditions are possible within the tropical storm watch area in Cuba Monday night and Tuesday. RAINFALL: Tropical Storm Ian is expected to produce the following rainfall: Jamaica and the Cayman Islands: 3 to 6 inches, with local maxima up to 8 inches. Western Cuba: 4 to 8 inches, with local maxima up to 12 inches. Florida Keys to the southern and western Florida Peninsula: 2 to 4 inches, with local maxima up to 6 inches through Wednesday 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 week. Additional flooding and rises on area streams and rivers across northern Florida and parts of the Southeast cannot be ruled out, especially in central Florida given already saturated antecedent conditions. STORM SURGE: Storm surge could raise water levels by as much as 9 to 14 feet above normal tide levels along the coast of western Cuba in areas of onshore winds in the watch area Monday night and early Tuesday. 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 are affecting Jamaica and will spread to the Cayman Islands later today. Swells will then spread northwestward to the southwestern coast of Cuba and the coasts of Honduras, Belize, and the Yucatan Peninsula of Mexico Monday and Monday night. 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 1100 AM EDT. $$ Forecaster Reinhart


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