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Hurricane Irma 10pm Advisory 9.9.17

Hurricane Irma Advisory Number 44
NWS National Hurricane Center Miami FL AL112017
1100 PM EDT Sat Sep 09 2017

…IRMA TAKING ITS TIME MOVING AWAY FROM CUBA…
…LIFE-THREATENING STORM SURGE EXPECTED IN THE FLORIDA KEYS AND
THE WEST COAST OF FLORIDA…

 

SUMMARY OF 1100 PM EDT…0300 UTC…INFORMATION
———————————————–
LOCATION…23.5N 81.0W
ABOUT 30 MI…50 KM NNE OF VARADERO CUBA
ABOUT 90 MI…145 KM SE OF KEY WEST FLORIDA
MAXIMUM SUSTAINED WINDS…120 MPH…195 KM/H
PRESENT MOVEMENT…NW OR 305 DEGREES AT 6 MPH…9 KM/H
MINIMUM CENTRAL PRESSURE…933 MB…27.55 INCHES

 

WATCHES AND WARNINGS
——————–
CHANGES WITH THIS ADVISORY:

The Storm Surge Warning has been extended westward from the Suwannee River to the Ochlockonee River.

The Storm Surge Warning has been discontinued north of North Miami Beach to Jupiter Inlet.

The government of Cuba has discontinued the Hurricane Warning for the province of Camaguey.

SUMMARY OF WATCHES AND WARNINGS IN EFFECT:

A Storm Surge Warning is in effect for…
* South Santee River southward to Jupiter Inlet
* North Miami Beach southward around the Florida peninsula to the
Ochlockonee River
* Florida Keys
* Tampa Bay

A Storm Surge Watch is in effect for…
* North of the Suwanee River to Ochlockonee River

A Hurricane Warning is in effect for…
* Fernandina Beach southward around the Florida peninsula to Indian
Pass
* Florida Keys
* Lake Okeechobee
* Florida Bay
* Cuban provinces of Ciego de Avila, Sancti Spiritus, Villa Clara,
Matanzas, and La Habana
* Andros Island, Bimini, and Grand Bahama

A Hurricane Watch is in effect for…
* North of Fernandina Beach to Edisto Beach

A Tropical Storm Warning is in effect for…
* West of Indian Pass to the Okaloosa/Walton County Line
* North of Fernandina Beach to South Santee River

A Storm Surge Warning means there is a danger of life-threatening inundation, from rising water moving inland from the coastline, during the next 36 hours in the indicated locations. For a depiction of areas at risk, please see the National Weather
Service Storm Surge Watch/Warning Graphic, available at hurricanes.gov. This is a life-threatening situation. Persons
located within these areas should take all necessary actions to protect life and property from rising water and the potential for
other dangerous conditions. Promptly follow evacuation and other instructions from local officials.

A Storm Surge Watch means there is a possibility of life-threatening inundation, from rising water moving inland from the
coastline, in the indicated locations during the next 48 hours. For a depiction of areas at risk, please see the National Weather
Service Storm Surge Watch/Warning Graphic, available at hurricanes.gov.

A Hurricane Warning means that hurricane conditions are expected somewhere within the warning area. 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 Warning means that tropical storm conditions are expected somewhere within the warning area.

Interests elsewhere in Cuba and the southeastern United States should monitor the progress of Irma.

For storm information specific to your area in the United States, including possible inland watches and warnings, please monitor products issued by your local National Weather Service forecast office. For storm information specific to your area outside the United States, please monitor products issued by your national meteorological service.

 

DISCUSSION AND 48-HOUR OUTLOOK
——————————
At 1100 PM EDT (0300 UTC), the eye of Hurricane Irma was located near latitude 23.5 North, longitude 81.0 West. Irma is moving slowly northwestward away from the north coast of Cuba near 6 mph (9 km/h). A turn toward the north-northwest with an increase in forward speed is expected through late Monday. On the forecast track, the center of Irma is expected to cross the Lower Florida Keys Sunday morning and then move near or along the west coast of Florida Sunday afternoon through Monday morning. Irma should then move inland over the Florida panhandle and southwestern Georgia Monday afternoon.

Maximum sustained winds are near 120 mph (195 km/h) with higher gusts. Irma is a category 3 hurricane on the Saffir-Simpson Hurricane Wind Scale. Irma is forecast to restrengthen a little while it moves through the Straits of Florida and remain a powerful hurricane as it approaches the Florida Keys and the west coast of Florida.

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).

The estimated minimum central pressure is 933 mb (27.55 inches).

 

HAZARDS AFFECTING LAND
———————-
STORM SURGE: The combination of a dangerous storm surge and the tide will cause normally dry areas near the coast to be flooded by rising waters moving inland from the shoreline. The water is expected to reach the following HEIGHTS ABOVE GROUND if the peak surge occurs at the time of high tide…

Cape Sable to Captiva…10 to 15 ft
Captiva to Ana Maria Island…6 to 10 ft
Card Sound Bridge through Cape Sable, including the Florida Keys…
5 to 10 ft
Ana Maria Island to Clearwater Beach, including Tampa Bay…
5 to 8 ft
North Miami Beach to Card Sound Bridge, including Biscayne Bay…
3 to 5 ft
South Santee River to Fernandina Beach…4 to 6 ft
Clearwater Beach to Ochlockonee River…4 to 6 ft
Fernandina Beach to Jupiter Inlet…2 to 4 ft
North of North Miami Beach to Jupiter Inlet…1 to 2 ft

The deepest water will occur along the immediate coast in areas of onshore winds, where the surge will be accompanied by large and destructive waves. Surge-related flooding depends on the relative timing of the surge and the tidal cycle, and can vary greatly over short distances. For information specific to your area, please see products issued by your local National Weather Service forecast office.

The combination of a life-threatening storm surge and large breaking waves will raise water levels ABOVE NORMAL TIDE LEVELS by the following amounts within the hurricane warning area near and to the north of the center of Irma. Near the coast, the surge will be accompanied by large and destructive waves.

Northwestern Bahamas…3 to 6 ft
Northern coast of Cuba in the warning area…5 to 10 ft

WIND: Hurricane conditions are expected to continue within the hurricane warning area along the north coast of Cuba through tonight. Hurricane conditions are expected in portions of the northwestern Bahamas tonight, and in portions of the Florida peninsula and the Florida Keys beginning Sunday morning. Tropical storm and hurricane conditions are expected to spread northward across the remainder of the warning areas through Monday.

RAINFALL: Irma is expected to produce the following rain accumulations through Wednesday:

Northern Cuba…10 to 15 inches, isolated 20 inches.
Southern Cuba…5 to 10 inches, isolated 15 inches.
Western Bahamas…3 to 6 inches, isolated 10 inches.
The Florida Keys…10 to 20 inches, isolated 25 inches.
The Florida peninsula and southeast Georgia…8 to 15 inches,
isolated 20 inches.
The eastern Florida Panhandle and southern South Carolina…4 to 8
inches, isolated 10 inches.
Rest of eastern Georgia, western South Carolina, and western North
Carolina…4 to 8 inches.
Western Georgia, eastern and northern Alabama, and southern
Tennessee…2 to 5 inches.

In all areas this rainfall may cause life-threatening flash floods and, in some areas, mudslides.

TORNADOES: A few tornadoes are possible through Sunday night, mainly across southern, central, and eastern portions of the Florida
peninsula.

SURF: Swells generated by Irma are affecting the southeast coast of the United States. These swells are likely to cause life-
threatening surf and rip current conditions. Please consult products from your local weather office.

 

NEXT ADVISORY
————-
Next intermediate advisory at 200 AM EDT.
Next complete advisory at 500 AM EDT.

Forecaster Berg

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