A Coastal Flood Warning is in Effect for Parts of the Area

An intermittent coastal flood advisory has been issued for parts of the area. Flooding may affect low-lying areas near shorelines and tidal waterways during times of high tide through early Tuesday morning.

Staying aware of the distinctions among flood watches, warnings and advisories can assist residents in being prepared for impending weather events and protecting their properties.

Moderate to Major Coastal Flooding

Rising tides pose a grave danger to both people and property in coastal regions. Floodwaters may come from abnormally high tides, storm surge, persistent onshore winds or excessive rainfall runoff in rivers and estuaries.

A coastal flood WATCH indicates the possibility or imminence of sea water spillage over dunes and sea walls within 12 hours, so residents in areas under such watch should be ready to take action to protect themselves if it becomes necessary.

Major coastal flooding causes serious repercussions for roads, bridges, and walkways in affected areas. Evacuation may be necessary in extreme cases. It greatly disrupts communities. Moderate coastal flooding damages homes and businesses, requiring costly repairs. Similarly, moderate coastal floods leading to significant disruption cause extensive damage.

As our climate warms, high tide flooding is increasingly common – even in places that did not historically flood during major storms. No longer does a powerful hurricane or nor’easter have to strike for streets and communities along the coast to flood. To help identify your risk more accurately, the Coastal Inundation Dashboard offers real-time, forecast, and historic water level displays from NOAA’s long term coastal water level stations – making its presence felt through map views as well as station views at NOAA long term coastal water level stations across NOAA long term coastal water level stations around NOAA long term coastal water level stations throughout coastal stations all along NOAA’s long term coastal water level stations for real-time and forecast views in real time and station views from NOAA long term coastal water level stations across NOAA to help identify your risks more accurately than ever before!

Moderate to Major Coastal Storm Surge

Storm surge flooding occurs in coastal areas when waves from the ocean erupt onto land during a hurricane or cold season nor’easter, often causing extensive damage and worsened by sea level rise. New York City’s low-lying areas are vulnerable to this form of flooding during most tropical storms and hurricanes as well as some nor’easters; homeowners can prepare themselves by understanding their property elevation relative to sea level as well as reviewing FEMA flood maps and local resources to understand their risk for storm surge flooding.

People living in areas under a coastal flood watch should be prepared to evacuate in case a warning is issued. A coastal flood warning indicates that sea water spillage over dunes and sea walls has occurred or will soon occur, and presents a risk to life and/or property.

Flooding from the sea during a hurricane is caused by storm surge, with additional rain coming off of winds. Hurricane Katrina showed us just how devastating storm surge-related flooding can be – inundating homes and communities up to 18 feet above sea level in Louisiana alone! NYCEM is closely following forecasts and working alongside National Weather Service forecasters in order to gain real-time awareness of any risks present.

At-risk New York City residents who reside within storm surge evacuation zones should take measures to protect their homes and belongings from storm surge. It is crucial that these individuals remain away from shore areas, tidal waterways, as well as beware of rip currents that can sweep swimmers out into deeper water. When near beaches it is wise to use lifeguard stands while remaining clear from rocks or piers.

Moderate to Major Inland Flooding

Inland flooding occurs when too much water exceeds the capacity of natural and built drainage systems to drain it away, usually as the result of landfalling tropical cyclones, rainfall-induced streamflow discharge, or coastal storm surge. It’s the leading cause of death associated with landfalling tropical cyclones as well as much of their related property damage.

Coastal flooding depends on several factors, including storm intensity and size, off-shore/onshore topography differences and development density near the coast. A major coastal flood can often be caused by a storm surge produced by strong winds that forms an underwater wall of water that results in significant loss of life as well as significant destruction to homes and businesses along its path.

Moderate coastal flooding typically results from heavy rains or an unusually rapid accumulation of precipitation, and may affect wide swaths of coastline. Though not usually deep, moderate coastal flooding may cover roads and buildings and disrupt access between affected regions.

Active voice: High tides or local effects such as seawalls can cause minor flooding; NWS impact thresholds fail to consider these local effects, resulting in differences between thresholds used at different locations. To assist with flood response efforts, the Coastal Inundation Dashboard offers real-time and forecast water levels as well as historic flooding data at NOS water level stations.

Moderate to Major Flash Flooding

Moderate to major coastal flooding will impact parts of Maryland between now and Tuesday morning due to strong offshore winds and a full moon, leading to higher-than-normal water levels during several high tide cycles. Some locations may experience as much as one foot of Bay water above dry land during high tide.

Coastal Flood Watches indicate the potential for sea water spillage over dune lines and sea walls in affected areas, and those in those regions should be prepared to relocate if warnings are issued.

A coastal flood warning indicates life-threatening inundation (3 feet or greater above ground level) is either occurring, imminent, or expected to occur in a particular location, often as the result of tropical, subtropical, or posttropical cyclone activity.

Floodwaters may contain contaminants or electrical currents and be home to dangerous predators like fire ants, alligators and snakes. Be wary of moving flood waters as they could quickly rise and consume entire cars or vehicles.

Be wary of rip currents as they can sweep even strong swimmers into deeper water. Check local beach closures, plan ahead if traveling through areas prone to flooding and evacuate immediately when a Flood Warning is in effect. Be especially wary if living below-grade such as making sure your sump pump works and disconnecting appliances in case a flood threatens.

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