Hurricane Dorian is coming: What kinds of impacts to expect

by | September 4, 2019 8:36 am

Dangerous Hurricane Dorian will track north very close to the Florida coast through Wednesday and very near the South Carolina and Georgia coasts Wednesday night through Thursday. The hurricane will bring an increased risk for strong winds, storm surge inundation, flash flooding, strong rip currents, and dangerous marine conditions to the region.
The combination of significant storm surge inundation and heavy rainfall could enhance the risk for flash flooding, especially along the lower South Carolina coast, including downtown Charleston and the nearby coastal communities.

POTENTIAL IMPACTS
SURGE: Prepare for life-threatening surge having possible extensive impacts across the coastal counties of Southeast South Carolina and Southeast Georgia. Potential impacts in this area include:
Large areas of deep inundation of saltwater along immediate shorelines and in low-lying spots farther inland near rivers and creeks, with storm surge flooding accentuated by battering waves.
Structural damage to buildings, with several washing away.
Damage compounded by floating debris. Locations may be uninhabitable for an extended period.
Large sections of near-shore escape routes and secondary roads washed out or flooded and impassable.
Flood control systems and barriers could become stressed.
Severe beach erosion with significant dune loss.
Major damage to marinas, docks, boardwalks, and piers. Many small craft broken away from moorings, especially in unprotected anchorages, with some lifted onshore and stranded.
Drinking water and sewer services negatively impacted.
Hazardous containers and materials possibly present in surge waters.
Elsewhere across southeast South Carolina and southeast Georgia, little to no impact is anticipated.
WIND: Prepare for life-threatening wind having possible extensive impacts across for areas roughly along and east of Interstate 95. Potential impacts in this area include:
Considerable roof damage to sturdy buildings, with some window, door, and garage door failures leading to structural damage.
Mobile homes severely damaged, with some destroyed.
Damage accentuated by airborne projectiles.
Some locations may be uninhabitable for weeks.
Danger of death or injury from falling objects and airborne projectiles outside.
Large trees snapped or uprooted.
Some roads impassable from large debris, and more within urban or heavily wooded locations.
Several bridges and access routes impassable.
Large areas with power and communications outages, which could persist for days.
Several secured small craft could break free from moorings.
Also, prepare for dangerous wind having possible limited to significant impacts across interior Southeast South Carolina and Southeast Georgia.
FLOODING RAIN: Prepare for life-threatening rainfall flooding having possible extensive impacts across coastal areas of Southeast South Carolina and Southeast Georgia.
Potential impacts include:
Major rainfall flooding could prompt many rescues.
Rivers and tributaries could rapidly overflow their banks in multiple locations. Small streams, creeks, canals, ditches may become dangerous rivers.
Flood control systems and barriers could become stressed.
Floodwaters could enter many structures within multiple communities; some structures become uninhabitable or are washed away.
Floodwaters could cover multiple escape routes. Streets and parking lots become rivers of moving water with underpasses submerged.
Driving conditions become dangerous. Many road and bridge closures with some weakened or washed out.
Drinking water and sewer services could be negatively impacted.
Hazardous containers and materials could possibly be present in floodwaters.
Prepare for dangerous rainfall flooding having possible limited to significant impacts across the coastal areas of Southeast South Carolina and Southeast Georgia.
TORNADOES: Prepare for a tornado event having possible limited impacts across the coastal areas of Southeast South Carolina and Southeast Georgia.
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.

OTHER COASTAL
HAZARDS
Severe beach erosion, high surf with breakers 5 feet or greater, and strong rip currents will occur across the beaches of Southeast South Carolina and Southeast Georgia. A High Surf Advisory is in effect.

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.

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