It’s a good idea to know the natural disasters and hazards so you can prepare an emergency plan. I had my plan in place but had to do another plan when I moved. My biggest threat was surviving a power outage during winter. Now it’s surviving a hurricane. This got me thinking that others might want to know the threats so they can plan properly.
12 Natural Disasters
- Flash Flood
- Thunderstorms and Lightening
- Heat Wave/High Temperatures
- Winter Storm/ Cold Temperatures
- Landslide and Debris Flow
Federal Emergency Management Agency: FEMA Survival Planning
What is a Natural Disaster?
A natural disaster is a real event such as flood, hurricane, thunderstorm, tornado, high temperatures, winter storm, earthquake, volcano, landslide, tsunamis, fire, or wildfire that result in extreme property damage, loss of life, and/or bodily injury.
The Difference Between a Natural Hazard and a Natural Disaster
A Natural Hazard is something that can happen in your area. A natural disaster is when it happens. Know your hazards so you can be ready for emergencies.
- A Natural Hazard is a latent or active natural force that may cause a disaster event but has not yet occurred. Hurricanes are very likely to happen and strike land on the Gulf Coast of the United States, so; they are a “natural hazard” in this geographic location.
- A Natural Disaster occurs when a natural hazard causes an event. Hurricane Katrina caused severe damage to property and loss of life, so it is a natural disaster.
A Flood is an overflow of water onto naturally dry land. Flooding is the most common and the most destructive of all the natural hazards.
What Causes Floods?
- Heavy Rain
- River Overflow
- Dam Failure
- Hurricanes and Tsunamis
- Poorly Engineered Water Canals
- Overengineered River Beds
- Wild Fires
- Floods cause extensive property damage and loss of life.
- The degree of damage caused by flooding is dependent on the volume of water and how long it takes the water to recede.
- Floods often accompany other natural disasters such as storm surges, hurricanes, or tsunamis.
One of the scariest things about flash flooding is you can be standing in perfect sunshine with no rain and have a massive river of water come out of nowhere.
Flash floods are rapid flooding that happens in lower-lying areas like washes and rivers.
- Flash-flooding can occur due to heavy rain, hurricanes, tropical storms, or snowmelt.
- Broken dams or levees will also cause flash-flooding.
According to the Environmental Protection Agency, “attempting to drive through floodwaters is a leading cause of flood-related deaths.”
Thunderstorms and Lightning
Lightning is a rapid discharge of atmospheric electricity. Thunderstorms are lightning storms. If the thunderstorm is far enough from your location, you can hear the lightning, but you can’t see it.
- Thunderstorms and lightning can cause massive blackouts and fires.
- Thunderstorms often accompany other natural hazards like flash flooding, tornadoes, forest fires, or power outages.
Hurricanes are a tropical storm that begin as a rotating low-pressure weather system, with winds less than 39 mph, called a tropical depression. When wind speed reaches 39 mph or higher, the depression becomes a tropical storm. At wind speeds of 74 mph or more, you have a Hurricane.
How Do You Determine the Intensity of a Hurricane?
A Hurricanes’ intensity is its wind speed. See the following chart for details.
What Are The Categories of Hurricane?
|Very dangerous winds will produce some damage: Well-constructed frame homes could have damage to the roof, shingles, vinyl siding, and gutters. Large branches of trees will snap, and shallowly rooted trees may be toppled. Extensive damage to power lines and poles likely will result in power outages that could last a few to several days.|
|Extremely dangerous winds will cause extensive damage: Well-constructed frame homes could sustain major roof and siding damage. Many shallowly rooted trees will be snapped or uprooted and block numerous roads. Near-total power loss is expected with outages that could last from several days to weeks.|
|Devastating damage will occur: Well-built framed homes may incur major damage or removal of roof decking, and gable ends. Many trees will be snapped or uprooted, blocking numerous roads. Electricity and water will be unavailable for several days to weeks after the storm passes.|
|Catastrophic damage will occur: Well-built framed homes can sustain severe damage with loss of most of the roof structure and/or some exterior walls. Most trees will be snapped or uprooted and power poles downed. Fallen trees and power poles will isolate residential areas. Power outages will last weeks to possibly months. Most of the site will be uninhabitable for weeks or months.|
|157 mph or higher|
137 kt or higher
252 km/h or higher
|Catastrophic damage will occur: A high percentage of framed homes will be destroyed, with total roof failure and wall collapse. Fallen trees and power poles will isolate residential areas. Power outages will last for weeks to possibly months. Most of the site will be uninhabitable for weeks or months|
Is It Just Hurricane Winds That Cause Damage?
When hurricanes hit land, they create a storm surge, pushing ocean water ashore. The heavy rains that accompany the rise of ocean water cause catastrophic flooding.
A tornado is an extreme column of rotating air that makes contact with the ground. The Fujita scale is used to determine the wind speed that a tornado attains. The higher the wind speed, the larger the tornado, the more damage caused.
How Do You Determine the Intensity of a Tornado?
The Enhanced Fujita Scale is used in the United States to determine how intense a tornado is by examining windspeed and the damage caused to man-made structures.
Enhanced Fujita Scale For Tornado Intensity
|EF-OF||65 to 85 mph||Light Damage|
|EF-1||86 to 100 mph||Moderate Damage|
|EF-2||111 mph to 135 mph||Considerable Damage|
|EF-3||136 mph to 165 mph||Severe Damage|
|EF-4||166 mph to 200 mph||Devastating Damage|
|EF-5||200 mph +||Incredible Damage|
How Much Damage Can an F-5 Tornado Do?
EF-5 tornadoes can do a lot of damage, which includes:
- Tear buildings off of foundations
- Peal black-top off of a roadway
- Hurl vehicles up to 100 meters (298 feet)
- Cause structural damage to high-rise buildings
- Create missile hazards by driving objects through opposing objects
Where Do Tornadoes Occur?
Tornadoes are most prevalent in North America, specifically an area called Tornado Alley. Tornadoes also occur in Australia, Europe, Africa, Asia, and South America.
What is Tornado Alley?
Tornado Alley is an area of the United States that has a high potential for tornadoes, from late spring to early fall. The States Included in Tornado Alley:
- Eastern Colorado
- South Dakota
A heatwave (heatwave) is a period of abnormally high temperature, often accompanied by humidity. Weather services declare heatwaves by comparing current temperatures to the normal seasonal temperature in that location.
Natural Disasters Caused by Heatwaves
- Crop Failure
- Deaths from overheating
- Widespread power outages
Heat doesn’t cause power outages, but abnormally high temperatures make people turn on fans and crank up the A.C. This increases the demand for power that an aging electrical grid can’t handle.
Power outages can be especially hazardous in areas affected by the heat island effect.
What is the Heat Island Effect?
The Heat Island Effect happens in an area with a population of one million or more. The site has higher than average temperatures than the surrounding area because there is a lack of natural materials and a high amount of manmade products like steel and concrete.
What Causes Heat Island Effect?
- Big cities have less natural materials like grass and trees that are permeable to moisture and stay somewhat moist.
- When natural materials are replaced with asphalt, concrete, and other infrastructure, the environment becomes impervious to humidity and dries out.
This dryness increases average temperatures up to 5.4 degrees in relation to surrounding areas.
Winter Storms and Cold Temperatures
Freezing weather, snow, and ice can incapacitate entire regions by shutting down freeways, knocking out electrical power, causing property damage, cutting off water, and heat.
Automobile accidents increase, and people stranded in snow are in danger of freezing.
An earthquake is when the ground moves because there is a sudden shift between the earth’s tectonic plates along plate boundaries or fault lines. Populated areas are the hardest hit because of falling debris and damage to infrastructure.
How Do Earthquakes Cause Damage?
- Ground movement
- Soil Liquefication caused by a shaking of sand, soil, and groundwater can cause buildings to sink or topple
- Ground displacement where the ground moves down or apart can collapse high-rise buildings, bust gas-lines, water mains, and sewage lines.
- Flooding by breaking damns and levees
- Fire from damaged gas and electrical lines
A volcano is a rupture in the earth’s crust that may or may not be active. If the walls of a dynamic magma chamber rupture, the volcano may release hot lava, ash, and toxic gases. The release can be mild or explosive.
- Volcanic eruptions can take human life when they explode or through suffocation from loss of oxygen
- Suffocation is the #1 cause of death caused by erupting volcanoes
- Volcanic eruptions trigger other natural disasters such as flooding, power outages, mudslides, drinking water contamination, and fires
Landslides and Debris Flows
A landslide is a massive movement of rock, soil, or debris down a steep slope. Debris flows are fast-moving landslides of mud, sand, dirt, or stone. They are particularly dangerous because they occur without warning, destroying everything in their path.
You can’t outrun a debris flow.
Interesting Facts About Landslides and Debris Flows:
- Debris flows can occur miles away, getting larger as they accumulate trees, boulders, cars, and other materials.
- The danger of landslides substantially increases when there is a forest-fire followed by extreme rain.
- Giant landslides in the ocean can cause tsunamis. Undersea earthquakes or volcanoes trigger these landslides.
A tsunami (tidal wave) is a series of waves caused by earthquakes, underwater landslides, or undersea volcanic eruptions. Tsunamis can be massively destructive to life and property.
- By the time Tsunamis reach the shoreline they can be traveling up to 100 mph
- Out in the ocean tsunamis get top speeds of 500 mph (that’s not a typo)
- When the leading edge of a Tsunami wave reaches the shore, it slows down due to the shallower water. The trailing part of the wave is moving faster than the leading edge causing the water to stack, increasing wave height.
In 2011, the 9.0 Magnitude, Sendai Earthquake occurred off the coast of Japan. Tragically, the earthquake triggered 33 ft tsunami waves that struck the coast taking 28,500 lives, causing massive property damage and triggering the Fukushima nuclear incident.
Wildfires/ Rural Fires/Wildland Fires
A wildfire is an unplanned fire that burns forests, grasslands or prairies. Often started by humans, or lightning, wildfires can cause a chain reaction of destruction such as flooding, power outages, and transportation disruptions.
In August of 2018, The Paradise Fire occurred, it was the deadliest and most destructive wildfire in California’s history, according to USA Today. The fire caused by a faulty electric transformer burned 153,336 acres of wildland and destroyed 18,804 buildings. Sadly, 84 people perished in this fire.
11 Technological Hazards
- Hazardous Material Incidents
- Trains with Hazardous Cargo
- Dam Failure
- Munition Factories
- Chemical Plants
- Petroleum Plants, and Fields
- Natural Gas Farms
- Fuel Storage Facilities
- Power Plants
- Nuclear Power Plant Emergencies
It’s not just the natural hazards that can cause a catastrophe. Be aware of Technological dangers in your area when planning for emergency preparedness.
What is a Technological Hazard?
Industry and technology can set the stage for major Technological Disasters via air pollution, water contamination, radiation poisoning, explosions, toxic waste, dangerous gas-clouds, fire, and transportation accidents.
Natural disasters or other hazards can trigger technological catastrophes. As an example, municipal water contaminated with industrial chemicals during hurricanes.
Terrorism is the use of violence to influence political, religious, or ideological beliefs by creating an environment of fear and uncertainty.
Terrorist Acts That Lead to Disaster
- Explosions: Using explosive materials to commit acts of terrorism
- Bioterrorism Intentionally releasing biological agents to kill or harm humans. Agents can be bacteria, toxins, or viruses. These agents are simple to make, inexpensive, and spread quickly.
- Chemical Threats The use of chemical toxins to harm humans, plants, or animals. Agents can come in the form of a gas, liquid, or solid.
- Nuclear Blasts: Explosion of an atomic bomb or an Improvised Nuclear Device. According to the Center for Disease Control and Prevention (CDC), “a nuclear explosion, initially, produces an intense pulse of heat, light, air pressure and radiation, followed by the “fallout” of radioactive materials.”
- Natural disasters may lead to an infectious disease outbreak that could turn into an epidemic or pandemic.
- After natural disasters occur, the most considerable outbreak risk comes from populations being forced to flee and move to another location. This puts a strain on clean water resources, sanitation, and medical facilities. (CDC)
What is an Epidemic?
“Epidemic refers to an increase, often sudden, in the number of cases of an infectious disease in a specific area.” (CDC)
What is a Pandemic?
A pandemic is an epidemic that crosses borders, or a worldwide spread of a new, infectious disease.
Pandemics are often associated with a new strain of influenza or mutations of avian flu, or CoronaVirus (SARS).
Examples of Pandemics:
- COVID-19 caused by a coronavirus called SARS-CoV-2
- HIV/Aids (2005 to 2012) Death Toll: 36 million
- Flu Pandemic (1968) Death Toll: 1 million
- Asian Flu (1956 to 1958) Death Toll: 2 million
- Spanish Flu (1918) Death Toll: 20 to 50 million
- Bubonic Plague (1346 to 1353) Death Toll: 50 million
What Kind of Diseases Reach Epidemic or Pandemic Proportions?
Any infectious disease that can be passed from one human to another can become a pandemic. If an infectious disease can spread via casual contact, it is more likely to spread quickly.
“ There was no vaccine for The Spanish Flu that killed 50 Million in 1918. There were no antibiotics to treat secondary bacterial infections…, control efforts worldwide were limited to non-pharmaceutical intervention such as isolation, quarantine, good personal hygiene, use of disinfectants, and limitations of public gatherings. (CDC)
Natural Hazards, FEMA click here
Make an Emergency Preparedness Plan, Ready.gov click here
Heat Island Effect, Environmental Protection Agency (EPA) click here
Saffir-Simpson Hurricane Wind Scale Extended Table, NOAA click here
Wild Fires, Ready.gov click here
Pandemic Influenza, Centers for Disease Control and Prevention click here