September 08, 2017
Issued at 800 PM EDT Fri Sep 08 2017
000WTNT31 KNHC 082356TCPAT1
BULLETINHurricane Irma Intermediate Advisory Number 39ANWS National Hurricane Center Miami FL
AL112017800 PM EDT Fri Sep 08 2017
...IRMA'S SOUTHWESTERN EYEWALL MOVING OVER THE NORTH COAST OFCUBA...
SUMMARY OF 800 PM EDT...0000 UTC...INFORMATION----------------------------------------------LOCATION...22.2N 77.2WABOUT 150 MI...240 KM E OF CAIBARIEN CUBAABOUT 315 MI...510 KM SE OF MIAMI FLORIDAMAXIMUM SUSTAINED WINDS...155 MPH...250 KM/HPRESENT MOVEMENT...W OR 280 DEGREES AT 12 MPH...19 KM/HMINIMUM CENTRAL PRESSURE...924 MB...27.29 INCHES
WATCHES AND WARNINGS
CHANGES WITH THIS ADVISORY:
The government of the Bahamas has discontinued the HurricaneWarning for the southeastern Bahamas, except for Ragged Island.
SUMMARY OF WATCHES AND WARNINGS IN EFFECT:
A Storm Surge Warning is in effect for...
* Sebastian Inlet southward around the Florida peninsula to Venice
* Florida Keys
A Storm Surge Watch is in effect for...
* North of Sebastian Inlet to the Flagler/Volusia County line
* North of Venice to Anclote River
* Tampa Bay
A Hurricane Warning is in effect for...
* Sebastian Inlet southward around the Florida peninsula to AnnaMaria Island
* Florida Keys* Lake Okeechobee
* Florida Bay
* Cuban provinces of Camaguey, Ciego de Avila, Sancti Spiritus, andVilla Clara
* Central Bahamas and Ragged Island
* Northwestern Bahamas
A Hurricane Watch is in effect for...
* North of Sebastian Inlet to the Flagler/Volusia County Line.
* North of Anna Maria Island to the Suwannee River
* Cuban provinces of Guantanamo, Holguin, Las Tunas and Matanzas
A Tropical Storm Warning is in effect for...* Cuban provinces of Guantanamo, Holguin, and Las Tunas
A Storm Surge Warning means there is a danger of life-threateninginundation, from rising water moving inland from the coastline,during the next 36 hours in the indicated locations. For adepiction of areas at risk, please see the National WeatherService Storm Surge Watch/Warning Graphic, available athurricanes.gov. This is a life-threatening situation. Personslocated within these areas should take all necessary actions toprotect life and property from rising water and the potential forother dangerous conditions. Promptly follow evacuation and otherinstructions from local officials.
A Storm Surge Watch means there is a possibility of life-threatening inundation, from rising water moving inland from thecoastline, in the indicated locations during the next 48 hours.For a depiction of areas at risk, please see the National WeatherService Storm Surge Watch/Warning Graphic, available athurricanes.gov.
A Hurricane Warning means that hurricane conditions are expectedsomewhere within the warning area. Preparations to protect life andproperty should be rushed to completion.
A Hurricane Watch means that hurricane conditions are possiblewithin the watch area. A watch is typically issued 48 hoursbefore the anticipated first occurrence of tropical-storm-forcewinds, conditions that make outside preparations difficult ordangerous.
A Tropical Storm Warning means that tropical storm conditions areexpected somewhere within the warning area.
Interests elsewhere in Cuba, Florida, and the southeastern UnitedStates should monitor the progress of Irma.
For storm information specific to your area in the United States,including possible inland watches and warnings, please monitorproducts issued by your local National Weather Service forecastoffice. For storm information specific to your area outside theUnited States, please monitor products issued by your nationalmeteorological service.
DISCUSSION AND 48-HOUR OUTLOOK------------------------------At 800 PM EDT (0000 UTC), the eye of Hurricane Irma was located nearlatitude 22.2 North, longitude 77.2 West. Irma is moving towardthe west near 12 mph (19 km/h), and a turn toward the northwest isexpected by late Saturday. On the forecast track, the eye of Irmashould continue to move near the north coast of Cuba and the centralBahamas tonight and Saturday, and be near the Florida Keys and thesouthern Florida Peninsula Sunday morning.
Maximum sustained winds are near 155 mph (250 km/h) with highergusts. Irma is a category 4 hurricane on the Saffir-SimpsonHurricane Wind Scale. Some fluctuations in intensity are likely tocontinue during the next day or two, but Irma is expected to remaina powerful hurricane as it approaches Florida.
Hurricane-force winds extend outward up to 70 miles (110 km) fromthe center, and tropical-storm-force winds extend outward up to 185miles (295 km).
Data from a NOAA Hurricane Hunter aircraft indicate that the minimumcentral pressure is 924 mb (27.29 inches).
HAZARDS AFFECTING LAND
STORM SURGE: The combination of a dangerous storm surge and thetide will cause normally dry areas near the coast to be flooded byrising waters moving inland from the shoreline. The water isexpected to reach the following HEIGHTS ABOVE GROUND if the peaksurge occurs at the time of high tide...
SW Florida from Captiva to Cape Sable...8 to 12 ftCape Sable to Boca Raton including the Florida Key...5 to 10 ftVenice to Captiva...5 to 8 ftAnclote River to Venice including Tampa Bay...3 to 5 ftBoca Raton to Flagler/Volusia County line...3 to 6 ft
The deepest water will occur along the immediate coast in areas ofonshore winds, where the surge will be accompanied by large anddestructive waves. Surge-related flooding depends on the relativetiming of the surge and the tidal cycle, and can vary greatly overshort distances. For information specific to your area, please seeproducts issued by your local National Weather Service forecastoffice.
The combination of a life-threatening storm surge and large breakingwaves will raise water levels ABOVE NORMAL TIDE LEVELS by thefollowing amounts within the hurricane warning area near and to thenorth of the center of Irma. Near the coast, the surge will beaccompanied by large and destructive waves.
Ragged Island in the Bahamas...15 to 20 ftCentral and Northwestern Bahamas...5 to 10 ftNorthern coast of Cuba in the warning area...5 to 10 ft
WIND: Hurricane conditions are still occurring over portions of thecentral Bahamas, as well as Ragged Island. Hurricane conditions areexpected to continue within the hurricane warning area along thenorth coast of Cuba through Saturday. Hurricane conditions areexpected in the northwestern Bahamas tonight and Saturday, and inportions of southern and central Florida and the Florida KeysSaturday night or early Sunday.
Hurricane conditions are possible within the watch area in centraland north Florida by Sunday, with tropical storm conditionspossible by late Saturday.
RAINFALL: Irma is expected to produce the following rainaccumulations through Tuesday night:
Dominican Republic, Haiti, and Turks and Caicos...additional 1 to 3inches.Southern Bahamas and northern Cuba...10 to 15 inches, isolated 20inches.Southern Cuba...4 to 8 inches, isolated 12 inches.Jamaica...1 to 2 inches.The Florida Keys, much of the Florida peninsula, and southeastGeorgia...8 to 15 inches, isolated 20 inches.Western and Northern Florida peninsula from Tampa northward...4 to 8inches, isolated 12 inches.Rest of Eastern Georgia, western South Carolina, and Western NorthCarolina...4 to 7 inches.Western Georgia, eastern and northern Alabama, and southernTennessee...2 to 5 inches.
In all areas this rainfall may cause life-threatening flash floodsand, in some areas, mudslides.
TORNADOES: A few tornadoes will be possible beginning Saturdaymorning across south Florida.
SURF: Swells generated by Irma are affecting the southeasternBahamas, the Turks and Caicos Islands, the northern coast of theDominican Republic, and should start affecting portions of thesoutheast coast of the United States tonight. These swells arelikely to cause life-threatening surf and rip current conditions.Please consult products from your local weather office.
Next complete advisory at 1100 PM EDT.
Click here to read more at The National Hurricane Center