[Tropical] Hurricane Local Statement

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Tropical Storm Isaias Local Statement Advisory Number 21
National Weather Service Charleston SC  AL092020
540 AM EDT Sun Aug 2 2020

This product covers southeast South Carolina and southeast Georgia

**ISAIAS TO IMPACT SOUTHEAST SOUTH CAROLINA AND SOUTHEAST GEORGIA
MONDAY INTO MONDAY NIGHT**

NEW INFORMATION
---------------

* CHANGES TO WATCHES AND WARNINGS:
    - The Tropical Storm Watch has been upgraded to a Tropical Storm
      Warning for Beaufort, Coastal Bryan, Coastal Chatham, Coastal
      Jasper, Coastal Liberty, Coastal McIntosh, Dorchester, Inland
      Berkeley, and Tidal Berkeley
    - The Tropical Storm Watch has been upgraded to a Tropical Storm
      Warning and a Storm Surge Watch have been issued for Charleston
      and Coastal Colleton
    - The Tropical Storm Watch has been cancelled for Inland Bryan,
      Inland Chatham, Inland Colleton, Inland Jasper, Inland Liberty,
      and Inland McIntosh

* CURRENT WATCHES AND WARNINGS:
    - A Tropical Storm Warning is in effect for Beaufort, Coastal
      Bryan, Coastal Chatham, Coastal Jasper, Coastal Liberty,
      Coastal McIntosh, Dorchester, Inland Berkeley, and Tidal
      Berkeley
    - A Tropical Storm Warning and Storm Surge Watch are in effect
      for Charleston and Coastal Colleton

* STORM INFORMATION:
    - About 450 miles south of Charleston SC or about 410 miles
      south-southeast of Savannah GA
    - 26.3N 79.5W
    - Storm Intensity 65 mph
    - Movement Northwest or 325 degrees at 9 mph

SITUATION OVERVIEW
------------------

Tropical Storm Isaias over The Bahamas is forecast to move northeast toward
the east coast of Florida today. Isaias should then move north and then
northeast near or over the Georgia and southeast South Carolina coasts
Monday into Monday night. Conditions should begin to deteriorate Monday
morning across the Georgia Coastal Empire and Monday afternoon across the
South Carolina Lowcountry before improving from south to north Monday night.
Tropical storm force winds, heavy rainfall, strong rip currents and
high surf are expected to lead to dangerous conditions, especially
near the coast and offshore. Flooding from a combination of heavy rain
and storm surge could become significant, especially around Charleston
Monday night around the time of high tide.

POTENTIAL IMPACTS
-----------------

* FLOODING RAIN:
Protect against dangerous rainfall flooding having possible
significant impacts across southeast South Carolina and southeast Georgia along
and east of I-95, especially in the Charleston Tri-County area, including Downtown
Charleston. Potential impacts include:
    - Moderate rainfall flooding could prompt some rescues.
    - Rivers and tributaries could quickly become swollen with
      swifter currents and overspill their banks in a few places,
      especially in normally vulnerable spots. Small streams, creeks,
      canals, and ditches overflow.
    - Flood waters can enter some structures or weaken foundations.
      Several places could experience expanded areas of rapid
      inundation at underpasses, low-lying spots, and poor drainage
      areas. Some streets and parking lots take on moving water as
      storm drains and retention ponds overflow. Driving conditions
      become hazardous. Some road and bridge closures.

Protect against locally hazardous rainfall flooding having possible
limited impacts across inland portions of southeast South Carolina and
southeast Georgia west of I-95.

* WIND:
Protect against dangerous wind having possible significant impacts
across the South Carolina coast, including eastern portions of the
Charleston Tri-County. Potential impacts in this area
include:
    - Some damage to roofing and siding materials, along with damage
      to porches, awnings, carports, and sheds. A few buildings
      experiencing window, door, and garage door failures. Mobile
      homes damaged, especially if unanchored. Unsecured lightweight
      objects become dangerous projectiles.
    - Several large trees snapped or uprooted, but with greater
      numbers in places where trees are shallow rooted.
    - Some roads impassable from large debris, and more within urban
      or heavily wooded places. A few bridges and access routes
      impassable.
    - Travel by vehicle or on foot increasingly difficult. Danger of
      death or injury from falling objects such as trees or electric
      wires outside.
    - Scattered power and communications outages, but more prevalent
      in areas with above ground lines, which could persist for hours
      or days.
    - Some poorly secured small craft could break loose from their
      moorings.

Also, protect against hazardous wind having possible limited impacts
elsewhere, including near and west of I-95.

* SURGE:
Protect against life-threatening surge having possible significant
impacts across tidal portions of Charleston and Colleton Counties, including
Downtown Charleston. Potential impacts in this area include:
    - Areas of inundation of saltwater along immediate shorelines and
      in low-lying spots farther inland near rivers and creeks, with
      storm surge flooding accentuated by waves. Damage to several
      buildings, mainly near the coast.
    - Sections of near-shore escape routes and secondary roads become
      weakened or washed out, especially in normally vulnerable low
      spots.
    - Moderate to major beach erosion with heavy surf breaching
      dunes. Strong and numerous rip currents.
    - Minor to moderate damage to marinas, docks, boardwalks, and
      piers. Several small craft broken away from moorings,
      especially in unprotected anchorages. Some navigation aids
      possibly displaced well off station, creating difficult
      navigation near inlets and waterways.

Also, protect against locally hazardous surge having possible limited
impacts elsewhere across tidal portions of southeast South Carolina
and north coastal Georgia.

Elsewhere across southeast South Carolina and southeast Georgia,
little to no impact is anticipated.

* OTHER COASTAL HAZARDS:
Dangerous rip currents, high surf, and some beach erosion are expected
along coastal portions of north Georgia and southern South Carolina,
especially Monday and Monday night.

* TORNADOES:
Protect against a tornado event having possible limited impacts
across eastern portions of the Charleston Tri-County. Potential impacts include:
    - Isolated tornadoes can hinder the execution of emergency plans.
    - Isolated locations could experience tornado damage, along with
      power and communications disruptions.
    - In isolated locations, tornadoes could damage trees, vehicles,
      boats and buildings, especially mobile homes and other poorly
      constructed structures.

Elsewhere across southeast South Carolina and southeast Georgia,
little to no impact is anticipated.

PRECAUTIONARY/PREPAREDNESS ACTIONS
----------------------------------

* OTHER PREPAREDNESS INFORMATION:
Now is the time to check your emergency plan and emergency supplies
kit and take necessary actions to protect your family and secure your
home or business.

When making safety and preparedness decisions, do not focus on the
exact forecast track since hazards such as flooding rain, damaging
wind gusts, storm surge, and tornadoes extend well away from the
center of the storm.

If in a place that is vulnerable to high wind, such as near large
trees, a manufactured home, upper floors of a high-rise building, or
on a boat, plan to move to safe shelter.

If you live in a place particularly vulnerable to flooding, such as
near the ocean or a large inland lake, in a low-lying or poor
drainage area, in a valley, or near an already swollen river, plan to
move to safe shelter on higher ground.

When securing your property, outside preparations should be concluded
as soon as possible before conditions deteriorate. The onset of
strong gusty winds or flooding can cause certain preparedness
activities to become unsafe.

Closely monitor weather.gov, NOAA Weather Radio and local news
outlets for official storm information. Listen for possible changes
to the forecast.

* ADDITIONAL SOURCES OF INFORMATION:
- For information on appropriate preparations see ready.gov
- For information on creating an emergency plan see getagameplan.org
- For additional disaster preparedness information see redcross.org

NEXT UPDATE
-----------

The next local statement will be issued by the National Weather
Service in Charleston SC around around 12 PM EDT today, or sooner if
conditions warrant.

$$
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