Atlantic Hurricane Forecast this week – Florence, Helene, Isaac, Joyce

Hurricane Florence is of the most immediate concern. See below for separate graphics and most recent detailed update on Florence from the National Hurricane Center.

ZCZC MIATWOAT ALL
TTAA00 KNHC DDHHMM

Tropical Weather Outlook
NWS National Hurricane Center Miami FL
800 AM EDT Thu Sep 13 2018

For the North Atlantic...Caribbean Sea and the Gulf of Mexico:

The National Hurricane Center is issuing advisories on Hurricane
Florence, located over the western Atlantic Ocean, on Hurricane
Helene, located over the eastern Atlantic Ocean, on Tropical
Storm Isaac, located near the Lesser Antilles, and on Subtropical
Storm Joyce, located a little less than a 1000 miles west-southwest
of the Azores.

1. A trough of low pressure located over the western Gulf of Mexico 
is producing disorganized showers and thunderstorms. While upper-
level winds are generally conducive for the development of a tropical
depression, the system only has about a day before it reaches the
western Gulf coast.  An Air Force Reserve Hurricane Hunter aircraft
is scheduled to investigate the disturbance later today, if
necessary. Regardless of development, heavy rainfall and gusty winds
are expected across portions of northeastern Mexico, Texas, and
Louisiana on Friday and Saturday.  Interests there should monitor
the progress of this system, and refer to products from their local
weather office.
* Formation chance through 48 hours...medium...50 percent.
* Formation chance through 5 days...medium...50 percent.

2. An area of low pressure is expected to develop near Bermuda late
this weekend or early next week.  Some gradual development is
possible after that time while the system drifts westward over the
western Atlantic.
* Formation chance through 48 hours...low...near 0 percent.
* Formation chance through 5 days...low...20 percent.

Public Advisories on Subtropical Storm Joyce are issued under WMO
header WTNT35 KNHC and under AWIPS header MIATCPAT5.
Forecast/Advisories on Subtropical Storm Joyce are issued under WMO
header WTNT25 KNHC and under AWIPS header MIATCMAT5.

Forecaster Landsea

BULLETIN
Hurricane Florence Advisory Number  57
NWS National Hurricane Center Miami FL       AL062018
1100 AM EDT Thu Sep 13 2018

...HEAVY RAINBANDS WITH TROPICAL-STORM-FORCE WINDS SPREADING ACROSS
THE OUTER BANKS AND COASTAL SOUTHEASTERN NORTH CAROLINA...
...LIFE-THREATENING STORM SURGE AND RAINFALL EXPECTED...


SUMMARY OF 1100 AM EDT...1500 UTC...INFORMATION
-----------------------------------------------
LOCATION...33.4N 75.5W
ABOUT 145 MI...230 KM ESE OF WILMINGTON NORTH CAROLINA
ABOUT 195 MI...315 KM E OF MYRTLE BEACH SOUTH CAROLINA
MAXIMUM SUSTAINED WINDS...105 MPH...165 KM/H
PRESENT MOVEMENT...NW OR 315 DEGREES AT 10 MPH...17 KM/H
MINIMUM CENTRAL PRESSURE...955 MB...28.20 INCHES


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

None.

SUMMARY OF WATCHES AND WARNINGS IN EFFECT:

A Storm Surge Warning is in effect for...
* South Santee River South Carolina to Duck North Carolina
* Albemarle and Pamlico Sounds, including the Neuse and Pamlico
Rivers

A Storm Surge Watch is in effect for...
* Edisto Beach South Carolina to South Santee River South Carolina
* North of Duck North Carolina to the North Carolina/Virginia border

A Hurricane Warning is in effect for...
* South Santee River South Carolina to Duck North Carolina
* Albemarle and Pamlico Sounds

A Hurricane Watch is in effect for...
* Edisto Beach South Carolina to South Santee River South Carolina

A Tropical Storm Warning is in effect for...
* North of Duck North Carolina to Cape Charles Light Virginia
* Chesapeake Bay south of New Point Comfort

Interests elsewhere in the southeastern and mid-Atlantic states
should monitor the progress of Florence.

A Storm Surge Warning means there is a danger of life-threatening
inundation, from rising water moving inland from the coastline. 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.

A Hurricane Warning means that hurricane conditions are expected
somewhere within the warning area, in this case within the next 12
to 24 hours.  Preparations to protect life and property should be
nearing 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.

For storm information specific to your area, including possible
inland watches and warnings, please monitor products issued by your
local National Weather Service forecast office.


DISCUSSION AND OUTLOOK
----------------------
At 1100 AM EDT (1500 UTC), data from an Air Force Reserve Unit
Hurricane Hunter aircraft and NOAA Doppler weather radars from
indicate that Florence was located near latitude 33.4 North,
longitude 75.5 West.  Florence is moving toward the northwest near
10 mph (17 km/h).  This general motion, accompanied by a further
decrease in forward speed, is expected to continue through today. A
turn to the west-northwest and west at an even slower forward speed
is expected tonight and Friday, and a slow west-southwestward motion
is forecast Friday night and Saturday.  On the forecast track, the
center of Florence will approach the coasts of North and South
Carolina later today, then move near or over the coast of southern
North Carolina and northeastern South Carolina in the hurricane
warning area tonight and Friday. A slow motion across portions of
eastern South Carolina is forecast Friday night through Saturday
night.

Data from the aircraft and Doppler weather radars indicate that
maximum sustained winds have decreased to near 105 mph (165 km/h)
with higher gusts. Little change in strength is expected before the
center reaches the coast, with weakening expected after the center
moves inland.

Florence is a large hurricane. Hurricane-force winds extend outward
up to 80 miles (130 km) from the center and tropical-storm-force
winds extend outward up to 195 miles (315 km). NOAA Buoy 41025,
located near Diamond Shoals, North Carolina, recently reported a
sustained wind of 54 mph (87 km/h).

The latest minimum central pressure based on data from the aircraft
is 955 mb (28.20 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...

Cape Fear NC to Cape Lookout NC, including the Neuse, Pamlico,
Pungo, and Bay Rivers...9-13 ft
North Myrtle Beach SC to Cape Fear NC...6-9 ft
Cape Lookout NC to Ocracoke Inlet NC...6-9 ft
South Santee River SC to North Myrtle Beach SC...4-6 ft
Ocracoke Inlet NC to Salvo NC...4-6 ft
Salvo NC to North Carolina/Virginia Border...2-4 ft
Edisto Beach SC to South Santee River SC...2-4 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 heavy and excessive
rainfall in the following areas...

Coastal North Carolina into far northeastern South Carolina...20 to
30 inches, isolated 40 inches. This rainfall will produce
catastrophic flash flooding and prolonged significant river
flooding.

Remainder of South Carolina and North Carolina into southwest
Virginia...6 to 12 inches, isolated 24 inches.

WIND:  Hurricane conditions are expected to reach the coast within
the hurricane warning area this evening or early Friday.  Tropical
storm conditions are already moving onshore within the warning
area.

TORNADOES:  A few tornadoes are possible in eastern North Carolina
through Friday.

SURF:  Swells generated by Florence are affecting Bermuda, portions
of the U.S. East Coast, and the northwestern and central Bahamas.
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 PM EDT.
Next complete advisory at 500 PM EDT.

$$
Forecaster Stewart
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