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News | September 11, 2018 5:03 AM


9/11/2018 5 am Hurricane Florence Update

09112018 5am update.jpg
...HURRICANE AND STORM SURGE WATCHES ISSUED FOR PORTIONS OF THE
COASTS OF NORTH AND SOUTH CAROLINA...


SUMMARY OF 500 AM AST...0900 UTC...INFORMATION
----------------------------------------------
ABOUT 1077 MI... ESE OF CHATHAM COUNTY
MAXIMUM SUSTAINED WINDS...140 MPH...220 KM/H
PRESENT MOVEMENT...WNW OR 290 DEGREES AT 15 MPH...24 KM/H
MINIMUM CENTRAL PRESSURE...944 MB...27.88 INCHES


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

A Storm Surge Watch has been issued for the east coast of the
United States from Edisto Beach, South Carolina northward to
the North Carolina-Virginia border, including the Pamlico and
Albemarle Sounds.

A Hurricane Watch has been issued for the east coast of the United
States from Edisto Beach, South Carolina, northward to the
North Carolina-Virginia border, including the Pamlico and Albemarle
Sounds.

SUMMARY OF WATCHES AND WARNINGS IN EFFECT:

A Storm Surge Watch is in effect for...
* Edisto Beach South Carolina to the North Carolina-Virginia border
* Albemarle and Pamlico Sounds, including the Neuse and Pamlico
Rivers

A Hurricane Watch is in effect for...
* Edisto Beach South Carolina to the North Carolina-Virginia border
* Albemarle and Pamlico Sounds

Interests elsewhere in the southeastern and mid-Atlantic states
should monitor the progress of Florence.  Additional watches may be
required later today.

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 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.


DISCUSSION AND OUTLOOK
----------------------
At 500 AM AST (0900 UTC), the center of Hurricane Florence was
located near latitude 26.4 North, longitude 64.1 West.  Florence is
moving toward the west-northwest near 15 mph (24 km/h).  A west-
northwestward to northwestward motion with a slight increase in
forward speed are expected during the next couple of days.  On the
forecast track, the center of Florence will move over the
southwestern Atlantic Ocean between Bermuda and the Bahamas through
Wednesday, and approach the coast of North Carolina or South
Carolina on Thursday.

Maximum sustained winds are near 140 mph (220 km/h) with higher
gusts.  Florence is a category 4 hurricane on the Saffir-Simpson
Hurricane Wind Scale.  Some strengthening is expected during the
next day or so, and Florence is expected to be an extremely
dangerous major hurricane through Thursday night.

Hurricane-force winds extend outward up to 40 miles (65 km) from the
center and tropical-storm-force winds extend outward up to 150 miles
(240 km).

The estimated minimum central pressure is 944 mb (27.88 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 has the
potential to reach the following heights above ground if peak surge
occurs at the time of high tide...

Edisto Beach to Murrells Inlet...2-4 ft
Murrells Inlet to Cape Fear...4-6 ft
Cape Fear to Cape Lookout including The Neuse and Pamlico
River...6-12 ft
Cape Lookout to Ocracoke Inlet...5-8 ft
Ocracoke Inlet to North Carolina/Virginia Border...3-5 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.

RAINFALL:  Florence is expected to produce total rainfall
accumulations of 15 to 20 inches with isolated maxima to 30 inches
near Florence's track over portions of North Carolina, Virginia, and
northern South Carolina through Saturday. This rainfall may produce
life-threatening flash flooding.

WIND:  Hurricane conditions are possible within the watch area by
late Thursday or Thursday night, with tropical storm conditions
possible by Thursday morning.

SURF:  Swells generated by Florence are affecting Bermuda and
portions of the U.S. East Coast.  These swells are likely to cause
life-threatening surf and rip current conditions.  Please consult
products from your local weather office.


Last Updated: September 11, 2018 8:09 AM


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