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New York City faces many hazards: extreme heat, heavy rain and flash floods, coastal storms and hurricanes, winter weather, and earthquakes. These can threaten lives, damage homes, and disrupt daily life.
NYC Emergency Management is the city’s lead agency for preparing for, responding to, and coordinating across government, community partners, and agencies during emergencies. Our mission is to keep the city ready before, during, and after disasters.
We need you to do your part. Prepare yourself, your household, and your community. Emergencies can happen quickly with little warning. The best way to stay safe is to follow three steps: Have a Plan. Gather Supplies. Stay Informed.
For more information on how the city works to protect itself against hazards long -term, visit the NYC Hazard Mitigation Plan at nychazardmitigation.com. It explains how New York City reduces risks from flooding, heat, wind, and other hazards.
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Three Steps to Stay Safe
Get the full plan: Complete the Ready New York: My Emergency Plan workbook at nyc.gov/readyny. Available in 13 languages and audio.
Be Ready for Extreme Heat
Extreme heat is the deadliest weather emergency in New York City, linked to over 500 deaths a year. Air conditioning is the best protection. Hot weather strains the body and can make health problems worse. It can raise your core temperature and lead to heat stroke or organ failure. Because of climate change, dangerously hot weather is happening more often and lasting longer.
Who is most at risk: Older adults, infants, people with health conditions, outdoor workers, people who live alone, and anyone without air conditioning.
Before Extreme Heat
During Extreme Heat
Indoors:
Outdoors:
Stay hydrated:
Check on others:
Know the signs of heat stroke:
After Extreme Heat
Be Ready: Thunderstorms, Heavy Winds, Tornadoes
Thunderstorms can bring heavy rain, strong winds, hail, and lightning. High winds — even without rain — can knock down trees and power lines, damage buildings, and send debris flying at dangerous speeds. In rare cases, severe thunderstorms can also produce tornadoes.
Who is most at risk: People who are outdoors, especially in open areas or near trees and power lines. People near scaffolding or construction sites. People on higher floors or in rooms with large windows. Anyone who needs extra time or help to move to a safer spot indoors. People in mobile homes, RVs, or temporary structures, which offer little protection from high winds or tornadoes. People in basement apartments (heavy rain can cause sudden flooding — see our Flash Floods & Excessive Rainfall section for more)
Before Thunderstorms, Heavy Winds & Tornadoes
During Thunderstorms, Heavy Winds & Tornadoes
After Thunderstorms, High Winds, or Tornadoes
Be Ready: Flash Flooding and Excessive Rainfall
Flooding can happen anywhere it rains. Flash flooding is especially dangerous because it happens fast — heavy rain overwhelms drainage systems, water fills streets and low-lying areas, and there is often very little warning. Excessive rainfall is different: it is prolonged, heavy rain that accumulates over hours, gradually saturating the ground, overwhelming the city's sewer system, and causing flooding that can persist long after the rain stops. Both are dangerous. Both can happen in the same storm.
In New York City, basements, below-grade, and underground spaces are particularly vulnerable to both. Water can rise faster than you expect and faster than you can safely react.
Who is most at risk: People who live in basement apartments or below-ground units — flooding can block exits and rise faster than you can react, even during slow-building rainfall events. People in low-lying neighborhoods or areas that have flooded before. People in vehicles, especially near underpasses, tunnels, or low-lying roads. Anyone using the subway during heavy rain. Anyone who needs extra time or help to move to a higher floor or safer location.
Before a Flash Flood or Excessive Rainfall Event
Sign up for alerts. Visit nyc.gov/notifynyc. When you sign up, if you live in a basement apartment, select the basement apartment alert option. This makes sure you get flood warnings that apply specifically to where you live. If you are deaf or hard of hearing, make sure your phone is set to vibrate and/or flash for emergency alerts, and consider asking a neighbor to check on you when flood warnings are issued.
Know your risk. If you live in a basement, ground-floor apartment, or a neighborhood that has flooded before, you are at higher risk. Do not wait for water to enter before you act — by then, it may be too late to leave safely. This is true even during slower rainfall events: water can accumulate gradually and then rise very quickly once it enters a space.
Make a plan now. Decide in advance where you will go if your home starts to flood — a neighbor on a higher floor, a nearby public building, or a friend or family member's home. Know more than one way out of your home and make sure exits like basement doors and windows are clear and easy to open. If you use a mobility device or need help to evacuate, identify a specific person — a neighbor, family member, or building staff — who can assist you before flooding begins. Do not wait until water is entering to ask for help. If you rely on a home health aide or caregiver, include them in your emergency plan and know in advance what you will do if they cannot reach you during a storm.
Install a water alarm or flood sensor. Small water alarms that alert you when water is detected on the floor are widely available for around $10–15. If you live in a basement or a flood-prone area, placing one near basement drains or low-lying areas can give you critical early warning — especially overnight or during slow-building rain events when you may not notice water entering until it is already dangerous.
Clear drains, gutters, and stairwells before storms. Remove debris from around basement windows, stairwell drains, and gutters so water can flow freely. This matters especially before prolonged rain events, when drainage systems are more likely to back up over time.
Get flood insurance. Standard renter and homeowner insurance policies do not cover flood damage. If you rent or own in a flood-prone area, ask your insurance provider about separate flood coverage.
Register if you rely on powered medical equipment. Contact your utility provider. Keep backup batteries charged and accessible.
Get your Go Bag ready. Keep a bag near your door or bed with: medications, a flashlight, batteries, a portable phone charger, and important documents in waterproof bags. If you use a powered mobility device, hearing aid, or other assistive technology, include extra batteries or a charger for that device. Bring copies of prescriptions and any medical documentation you may need.
During a Flash Flood or Excessive Rainfall Event
Call 911 if you are in immediate danger or trapped by rising water.
If you see heavy rain in the forecast, start thinking about your plan. You do not need to wait for an official alert to act — if you live in a basement or low-lying area, it is always safer to move early.
If a Flash Flood Watch is issued, flooding is possible. Stay alert, keep your phone nearby, and be ready to move quickly. If a Flash Flood Warning or Flash Flood Emergency is issued, act immediately: Move to a higher floor right away — do not wait to see water. If you are told to evacuate, go now. Stay on higher ground until the warning expires. The difference between a Warning and an Emergency is severity — both require the same action. Move now.
Once you leave a flooded area, do not go back home. Floodwater can rise in minutes. What looked safe when you left may not be safe when you return. Wait until officials confirm it is clear.
Turn Around, Don't Drown. Never walk, swim, or drive through floodwater — no matter how shallow it looks. Just 6 inches of moving water can knock a person off their feet. Just 1 foot of water can sweep away a car. Water on streets can conceal open drains, downed power lines, and uneven surfaces.
Never drive through flooded roads or underpasses. Turn around and find another route. Never drive around barricades — they are there for your safety.
If you have no access to a higher floor, go to a safer nearby location before flooding begins — a NYC government building lobby such as a police precinct or hospital entrance can provide refuge.
Avoid entering flooded subway stations. If you are already underground, follow MTA guidance and move to street level if water is entering the station. During prolonged rainfall, station and track flooding can develop gradually — check MTA alerts before traveling.
Do not enter flooded lobbies, stations, or underpasses. Even if the water looks passable, do not enter — conditions can change in seconds.
Do not touch floodwater. It may be contaminated with sewage, chemicals, or debris — and it may carry electrical current from downed lines or submerged equipment.
Stay alert at night. Flash flooding can happen while you sleep and heavy rainfall can intensify overnight. Keep your phone near you with alerts turned on and the volume up.
Do not touch electrical equipment or appliances if you or the equipment are wet.
After a Flash Flood or Excessive Rainfall Event
Call 911 if you are in immediate danger. Call 311 to report flood damage, blocked drains, or request non-emergency services.
Do not return home until it is safe. Wait for official confirmation before re-entering a flooded building. After prolonged rainfall, the ground may still be saturated and flooding can resume with any additional rain.
Stay out of flooded basements. Standing water near electrical equipment is life-threatening.
Do not walk or drive through standing water. Even after rain stops, flooded streets can remain dangerous and may conceal hazards. After excessive rainfall events, streets and underpasses may stay flooded for hours.
Wash thoroughly if you touched floodwater. Floodwater can carry sewage, bacteria, and other contaminants. Wash your hands and any exposed skin with soap and water.
Clean affected surfaces with a bleach solution. When cleaning up after a flood, disinfect surfaces with a diluted bleach solution under proper ventilation. Never mix bleach and ammonia — the combination creates dangerous fumes.
Throw away food that touched floodwater. Do not eat or use any food, including canned goods, that came into contact with floodwater.
Watch for mold. Mold can begin growing within 24–48 hours after flooding — and excessive rainfall that causes slow seepage into walls or floors can create mold conditions even without visible standing water. If your home has mold or you need cleanup help, contact 311.
Pump out flooded basements slowly. Remove about one-third of the water per day — not all at once. Water-saturated soil outside your walls creates pressure, and removing water too quickly can cause walls to crack or collapse. This is especially important after prolonged rainfall, when surrounding soil may be heavily saturated.
Document damage before cleaning up. Take photos and videos of all damage before removing water or debris. This will help with insurance claims and disaster assistance applications.
Check on your neighbors. After a flood, check on elderly neighbors, people with disabilities, and anyone in basement apartments or low-lying units who may need extra help.
Keep monitoring alerts. Flooding conditions can return quickly — especially after excessive rainfall has already saturated the ground, when even moderate additional rain can cause new flooding. Check Notify NYC and local news for updates on street closures, transit impacts, and ongoing risks.
Be Ready for Coastal Storms, Tropical Storms, and Hurricanes
Coastal storms, including nor'easters, tropical storms, and hurricanes, can bring severe flooding, strong winds, heavy rain, and storm surge. Hazards include falling trees, downed power lines, flying debris, and loss of heat, water, and power.
Who is most at risk: Anyone living or working on the coast, in a hurricane evacuation zone, people who live or work in high-rises during a storm, people in flood-prone areas, and anyone who needs help evacuating.
Before a Coastal Storm
During a Storm
If ordered to evacuate:
If you stay home but live outside an active hurricane evacuation zone:
After a Storm
Be Ready for Air Quality Events
Poor air quality in New York City can come from wildfire smoke, building fires, traffic, and other pollution and is measured using the Air Quality Index (AQI). The AQI runs from 0 to 500 and is grouped into six levels: 0–50 (Good), 51–100 (Moderate), 101–150 (Unhealthy for Sensitive Groups), 151–200 (Unhealthy), 201–300 (Very Unhealthy), and 301+ (Hazardous).
Poor air quality can cause eye irritation, breathing difficulties, chest pain, and worsened respiratory conditions like asthma. These events pose serious health risks.
Who is most at risk: Older adults, children, infants, people with heart or lung disease, asthma, or other respiratory conditions, pregnant individuals, outdoor workers, and those in communities with higher asthma rates and fewer resources to reduce exposure.
Before Air Quality Events
During Air Quality Events
Indoors:
Outdoors:
After Air Quality Events
Be Ready for Winter Weather
Winter in New York City can bring extreme cold, heavy snow, ice, and freezing rain. These hazards can disrupt transportation, shut down power and heat, block emergency services, and create dangerous conditions. Cold weather increases the risk of hypothermia and frostbite, especially for older adults, infants, and people with chronic health conditions.
Who is most at risk : Older adults, infants, people with chronic health conditions, outdoor workers, those who rely on medical equipment, and anyone without adequate heating.
Before Winter Weather
During Winter Weather
After Winter Weather
Be Ready For Snow Squalls
Before Snow Squalls
During Snow Squalls
After Snow Squalls
Be Ready for Earthquakes
Earthquakes are rare in New York City, but they can happen. The risk here is low to moderate. Shaking can still break glass, damage buildings, and knock down power lines. Unlike the West Coast, New York does not have an early warning system. If you feel shaking, do not wait for confirmation. Protect yourself right away.
Before an Earthquake
During an Earthquake
Indoors:
In bed:
If you use a wheelchair or walker:
In tall buildings:
Outdoors:
In a car:
On the subway or train:
For any life-threatening emergency, call 911 right away. If phones are not working, go to the nearest firehouse or police station if it is safe.
After an Earthquake
Be Ready for Recovery and Assistance
Property and Services
Cleanup and Safety
Mental Health and Support
Recovery is not only about homes and belongings. It is also about healing. Disasters and emergencies can affect emotional health and wellbeing. Free, confidential help is always available in New York City.
In an emergency, call 911.
NYC Well – 24/7 mental health support
NYC HOPE Hotline – 24/7 support for survivors of domestic violence, gender-based violence, sexual assault, trafficking, stalking, and elder abuse
988 Suicide & Crisis Lifeline – Free nationwide 24/7 crisis support
Disaster Distress Helpline – 24/7 nationwide support for disaster-related emotional distress
Available in 100+ languages
New York City is here for you before, during, and after every emergency. Whether you need help preparing, staying safe, recovering from damage, or healing emotionally, resources and support are available. You are part of this city, and you are not alone.