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Hurricane Isaias Advisory Number 28
NWS National Hurricane Center Miami FL AL092020
1100 PM EDT Mon Aug 03 2020
...HURRICANE CONDITIONS SPREADING ONTO THE COAST OF EASTERN SOUTH
CAROLINA AND SOUTHEASTERN NORTH CAROLINA...
...STRONG WINDS AND HEAVY RAINFALL LIKELY FROM THE EASTERN
CAROLINAS TO THE MID-ATLANTIC COAST TONIGHT AND TUESDAY...
SUMMARY OF 1100 PM EDT...0300 UTC...INFORMATION
ABOUT 25 MI...40 KM ENE OF MYRTLE BEACH SOUTH CAROLINA
ABOUT 50 MI...80 KM SW OF WILMINGTON NORTH CAROLINA
MAXIMUM SUSTAINED WINDS...85 MPH...140 KM/H
PRESENT MOVEMENT...NNE OR 20 DEGREES AT 22 MPH...35 KM/H
MINIMUM CENTRAL PRESSURE...988 MB...29.18 INCHES
WATCHES AND WARNINGS
CHANGES WITH THIS ADVISORY:
A Storm Surge Warning is now in effect from Ocracoke Inlet North
Carolina to Oregon Inlet North Carolina.
A Tropical Storm Warning is now in effect north of Stonington Maine
to Eastport Maine.
The Tropical Storm Warning and Storm Surge Warning south of the
South Santee River has been discontinued.
SUMMARY OF WATCHES AND WARNINGS IN EFFECT:
A Storm Surge Warning is in effect for...
* South Santee River South Carolina to Cape Fear North Carolina
* Pamlico and Albemarle Sounds, including the Neuse and Pamlico
* Ocracoke Inlet North Carolina to the North Carolina/Virginia
A Storm Surge Watch is in effect for...
* Cape Fear to Ocracoke Inlet North Carolina
A Hurricane Warning is in effect for...
* South Santee River South Carolina to Surf City North Carolina
A Tropical Storm Warning is in effect for...
* North of Surf City North Carolina to Eastport Maine
* Pamlico and Albemarle Sounds
* Chesapeake Bay
* Tidal Potomac River
* Delaware Bay
* Long Island and Long Island Sound
* Martha's Vineyard, Nantucket, and Block Island
A Storm Surge Warning means there is a danger of life-threatening
inundation, from rising water moving inland from the coastline,
in the indicated locations. For a depiction of areas at risk,
please see the National Weather Service Storm Surge Watch/Warning
Graphic 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
A Hurricane Warning means that hurricane conditions are expected
somewhere within the warning area.
A Tropical Storm Warning means that tropical storm conditions are
expected somewhere within the warning area, generally within 36
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 PM EDT (0300 UTC), the center of Hurricane Isaias was
located near latitude 33.8 North, longitude 78.5 West. Isaias is
moving toward the north-northeast near 22 mph (35 km/h), and this
general motion accompanied by a gradual increase in forward
speed is expected through tonight followed by a further increase in
the forward speed on Tuesday. On the forecast track, the center of
Isaias will make landfall in southern North Carolina during the
next hour or two, then move across eastern North Carolina for the
rest of the night. The center move near or along the coast of the
mid-Atlantic states on Tuesday, and continue across the northeastern
United States Tuesday night.
Maximum sustained winds are near 85 mph (140 km/h) with higher
gusts. Little change in strength is expected before landfall.
After landfall, only gradual weakening is anticipated after Isaias
makes landfall in the Carolinas and moves across the U.S.
mid-Atlantic region tonight and Tuesday.
Hurricane-force winds extend outward up to 25 miles (35 km) from the
center and tropical-storm-force winds extend outward up to 125 miles
(205 km). A station at Frying Pan Shoals, North Carolina, recently
reported sustained winds of 72 mph (116 km/h) and a wind gust of 93
mph (150 km/h).
The estimated minimum central pressure is 988 mb (29.18 inches).
HAZARDS AFFECTING LAND
Key messages for Isaias can be found in the Tropical Cyclone
Discussion under AWIPS header MIATCDAT4, WMO header WTNT44 KNHC,
and on the web at www.hurricanes.gov/text/MIATCDAT4.shtml.
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 could
reach the following heights above ground somewhere in the indicated
areas if the peak surge occurs at the time of high tide...
South Santee River SC to Cape Fear NC...3-5 ft
Edisto Beach to South Santee River SC...1-3 ft
Cape Fear to Ocracoke Inlet NC...2-4 ft
Ocracoke Inlet to the North Carolina/Virginia border including
Pamlico Sound, Albemarle Sound, Neuse and Pamlico Rivers...3-5 ft
North of the North Carolina/Virginia border to Martha's Vineyard
including the Chesapeake Bay, the Tidal Potomac River, Delaware Bay,
Long Island Sound, Block Island Sound, Narragansett Bay, Buzzards
Bay, and Vineyard Sound...1-3 ft
The deepest water will occur along the immediate coast in areas of
onshore winds, where the surge will be accompanied by large 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.
WIND: Hurricane conditions are spreading across the southern
portion of the hurricane warning area in South and North Carolina at
this time, with tropical storm conditions spreading onshore farther
to the north.
Widespread tropical-storm conditions are expected in the
tropical storm warning area from coastal North Carolina to the
mid-Atlantic states, including portions of the Chesapeake Bay
region, later tonight and Tuesday, with wind gusts to hurricane
force possible. These winds could cause tree damage and power
Tropical storm conditions are expected to reach southern New
England Tuesday afternoon and northern New England Tuesday night
and early Wednesday.
Gale-force winds are expected to spread into southeastern Quebec
Tuesday night and Wednesday. See products issued by Environment
Canada for more information.
RAINFALL: The following rainfall accumulations are expected along
and near the track of Isaias:
Carolinas and the Mid-Atlantic: 3 to 6 inches, isolated maximum
totals 8 inches.
Eastern New York and western New England from Connecticut to New
Hampshire: 2 to 4 inches, isolated maximum totals 6 inches.
Western and northern Maine: 1 to 3 inches.
Heavy rainfall along the East Coast, near the path of Isaias, will
result in flash and urban flooding, some of which may be significant
in the eastern Carolinas, Mid-Atlantic and Northeast through
Wednesday. Widespread minor to moderate river flooding is possible
across portions of the Carolinas and the Mid-Atlantic.
Quick-responding rivers in Northeast will also be susceptible to
minor river flooding.
TORNADOES: A few tornadoes will be possible across eastern North
Carolina tonight, and from eastern Virginia northeastward into
southern New England on Tuesday.
SURF: Swells generated by Isaias are affecting portions of the
Bahamas and the southeast coast of the United States and will spread
northward along the U.S. east coast during the next couple of days.
These swells are likely to cause life-threatening surf and rip
current conditions. Please consult products from your local weather
Next intermediate advisory at 200 AM EDT.
Next complete advisory at 500 AM EDT.