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Tropical Storm Idalia Intermediate Advisory Number 17A
NWS National Hurricane Center Miami FL       AL102023
800 PM EDT Wed Aug 30 2023
 
...IDALIA OVER SOUTHERN SOUTH CAROLINA...
...FLOOD THREAT CONTINUES OVER GEORGIA AND THE CAROLINAS...
 
 
SUMMARY OF 800 PM EDT...0000 UTC...INFORMATION
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LOCATION...32.7N 80.9W
ABOUT 60 MI...95 KM W OF CHARLESTON SOUTH CAROLINA
MAXIMUM SUSTAINED WINDS...65 MPH...100 KM/H
PRESENT MOVEMENT...NE OR 35 DEGREES AT 21 MPH...33 KM/H
MINIMUM CENTRAL PRESSURE...985 MB...29.09 INCHES
 
 
WATCHES AND WARNINGS
--------------------
CHANGES WITH THIS ADVISORY:
 
The Tropical Storm Warning has been discontinued south of Altamaha 
Sound, Georgia to the Flagler/Volusia County, Florida Line.
 
SUMMARY OF WATCHES AND WARNINGS IN EFFECT:
 
A Storm Surge Warning is in effect for...
* St. Catherine's Sound Georgia to South Santee River South Carolina
 
A Tropical Storm Warning is in effect for...
* Altamaha Sound, Georgia northward to the North Carolina/Virginia
border
* Pamlico and Albemarle Sounds
 
A Storm Surge Watch is in effect for...
* Beaufort Inlet to Ocracoke Inlet North Carolina
* Neuse and Pamlico Rivers North Carolina
 
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,
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 Tropical Storm Warning means that tropical storm conditions are
expected somewhere within the warning area.
 
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. For a depiction of areas at
risk, please see the National Weather Service Storm Surge
Watch/Warning Graphic, available at hurricanes.gov.
 
Interests in Bermuda should monitor the progress of Idalia.
 
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 800 PM EDT (0000 UTC), the center of Tropical Storm Idalia was
located near latitude 32.7 North, longitude 80.9 West.  Idalia is 
moving toward the northeast near 21 mph (33 km/h), and this general 
motion is expected to continue through tonight.  A generally 
eastward motion is forecast to begin on Thursday and continue 
through Saturday.  On the forecast track, the center of Idalia will 
move near or along the coast of South Carolina through tonight, and 
then just offshore of the coast of North Carolina on Thursday.  
Idalia will then move eastward over the western Atlantic into the 
weekend.
 
Maximum sustained winds have decreased to near 65 mph (100 km/h) 
with higher gusts.  Some additional weakening is forecast through 
tonight, but Idalia is expected to remain a tropical storm while it 
moves near the coasts of South Carolina and North Carolina.
 
Tropical-storm-force winds extend outward up to 205 miles (335 km)
from the center.  A sustained wind of 39 mph (63 km/h) and a gust 
to 50 mph (80 km/h) were recently reported at Folly South End, 
South Carolina, near Charleston.
 
The estimated minimum central pressure is 985 mb (29.09 inches).
 
 
HAZARDS AFFECTING LAND
----------------------
Key messages for Idalia can be found in the Tropical Cyclone
Discussion under AWIPS header MIATCDAT5 and WMO header WTNT45 KNHC,
and on the web at hurricanes.gov/text/MIATCDAT5.shtml
 
STORM SURGE: The combination of storm surge and 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...
 
Savannah River to South Santee River, SC...3-5 ft
Saint Catherines Sound, GA to Savannah River...2-4 ft
Beaufort Inlet, NC to Ocracoke Inlet, NC...2-4 ft
Neuse and Bay Rivers...2-4 ft
Pamlico and Pungo Rivers...2-4 ft
South Santee River, SC to Beaufort Inlet, NC...1-3 ft
Ochlockonee River, FL to East Cape Sable, FL...1-3 ft
Tampa Bay...1-3 ft
Charlotte Harbor...1-3 ft
Flagler/Volusia County Line, FL to Saint Catherines Sound, GA...1-3
ft
Ocracoke Inlet, NC to Duck, NC...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:  Tropical storm conditions are occurring within the tropical
storm warning area along the coasts of Georgia and South Carolina, 
and will spread across coastal sections of North Carolina tonight 
through Thursday.
 
RAINFALL:  Idalia is expected to produce a swath of 4 to 8 inches of
rainfall with isolated maxima up to 10 inches from east-central
Georgia through central to eastern South Carolina and eastern North
Carolina into Thursday.  These rainfall amounts will lead to areas
of flash, urban, and moderate river flooding, with considerable
impacts.  The trailing moisture band from Idalia has the potential
to produce additional rainfall amounts of 1 to 2 inches across the
west coast of Florida.
 
SURF:  Swells generated by Idalia along the eastern and central Gulf
coast will subside tonight and Thursday.  Swells will affect the
southeastern U.S. coast during the next few days.  These swells are
likely to cause life-threatening surf and rip current conditions.
Please consult products from your local weather office.
 
TORNADOES:  A few tornadoes will be possible through this evening
across coastal South Carolina and through tonight across southern
coastal North Carolina.
 
 
NEXT ADVISORY
-------------
Next complete advisory at 1100 PM EDT.
 
$$
Forecaster Pasch
 
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