A hurricane is extreme weather! Hurricanes (also called typhoons in the Pacific, cyclones in the Indian Ocean) are among the most destructive natural disasters. Extreme weather differs from "climate" (average conditions over decades). The Intergovernmental Panel on Climate Change (IPCC) reports that global warming has increased the frequency of extreme heatwaves and heavy precipitation events. Other extreme weather events include derechos (widespread, long-lasting wind storms), fire tornadoes (pyrocumulonimbus clouds), atmospheric rivers (narrow bands of intense moisture), and bomb cyclones (rapidly intensifying mid-latitude storms). The economic cost of extreme weather has been rising due to climate change and increased population in vulnerable areas (coasts, floodplains). The World Meteorological Organization (WMO) tracks extreme weather records (highest temperature, fastest wind speed, most rainfall).

The eye is the calm center! The lowest atmospheric pressure occurs in the eye. Hurricane strength is measured by wind speed. Category 5: winds over 157 mph (252 km/h). Storm surge (rising sea level) is often the deadliest part of a hurricane, not wind. Hurricane Katrina (2005) caused catastrophic storm surge and levee failures in New Orleans, killing over 1,800 people. The Atlantic hurricane season runs from June 1 to November 30 (peaks in September). Hurricanes are called "typhoons" in the Northwest Pacific and "cyclones" in the Indian Ocean and South Pacific. The most intense Atlantic hurricane on record is Hurricane Wilma (2005) with a central pressure of 882 mb. The deadliest Atlantic hurricane is the Great Hurricane of 1780 (20,000-27,500 deaths). Hurricane Dorian (2019) stalled over the Bahamas, causing catastrophic damage with 185 mph (295 km/h) winds. Hurricane Patricia (2015) had the strongest winds ever recorded (215 mph / 345 km/h) in the Eastern Pacific. Climate change is increasing hurricane intensity because warmer ocean water provides more energy. Warmer air holds more moisture, leading to heavier rainfall from hurricanes. Rapid intensification (wind speed increasing by at least 35 mph in 24 hours) is becoming more common.

Tornado Alley is the correct answer! Tornadoes form from supercell thunderstorms (rotating updrafts called mesocyclones). A tornado watch means conditions are favorable; a tornado warning means a tornado has been sighted or indicated by radar. The Tri-State Tornado (1925) killed 695 people across Missouri, Illinois, and Indiana – the deadliest in U.S. history. The strongest tornado ever recorded was the El Reno tornado (2013) with winds over 300 mph. Doppler radar can detect rotation inside storms (TVS – Tornado Vortex Signature). Some tornadoes are invisible until they pick up dust or debris. Waterspouts are tornadoes over water (usually weaker). A tornado's lifespan is typically a few minutes to over an hour. Tornadoes can produce very loud roaring sounds (like a freight train). The Joplin, Missouri tornado (2011) killed 158 people and was one of the costliest. Safe places during a tornado: basement, interior room without windows, or a storm cellar. Mobile homes are extremely dangerous during tornadoes (occupants should evacuate to a sturdy building). The United Kingdom has the most tornadoes per area, but they are much weaker than U.S. tornadoes. Storm chasers study tornadoes to improve warnings and understand their formation. The Enhanced Fujita scale is based on damage indicators (not wind speed measurements).

Thunder is the correct answer! Lightning strikes Earth about 100 times per second (8.6 million per day). The most lightning-prone place is Lake Maracaibo, Venezuela (about 250 flashes per square kilometer per year). Lightning can travel up to 10-15 miles (15-25 km) from the parent thunderstorm ("bolt from the blue"). Lightning safety: if you hear thunder, you are within striking distance. No place outside is safe. The only safe places are substantial buildings (with wiring and plumbing) or fully enclosed metal vehicles (not convertibles). Lightning victims do not carry an electrical charge and can be safely treated. About 10% of lightning strike victims die; survivors often suffer lifelong disabilities (neurological damage, chronic pain). Lightning can cause house fires, power outages, and wildfires (dry lightning). Lightning strikes also produce nitrogen oxides, which are essential for plant growth (fixing atmospheric nitrogen). The Empire State Building is struck by lightning about 25 times per year. Benjamin Franklin invented the lightning rod (1752) – a metal rod that conducts lightning safely to the ground.

Flash floods are the most dangerous! Most flash flood deaths occur in vehicles (people driving into flooded roads). "Turn Around, Don't Drown" is the National Weather Service's safety slogan. The 1976 Big Thompson Canyon flood in Colorado killed 144 people (most were in cars). The 2021 European floods killed over 200 people in Germany and Belgium. The 2010 Pakistan floods affected 20 million people. China's 1931 Yangtze River floods may have killed 1-4 million people (the deadliest natural disaster of the 20th century). Floods can also cause secondary hazards: landslides, waterborne diseases (cholera, typhoid), and contamination of drinking water. Climate change increases flood risk because warmer air holds more moisture, leading to heavier precipitation. Floodplains are natural areas that absorb floodwaters; development in floodplains increases flood risk. Levees and dams provide flood control but can fail catastrophically (New Orleans, Hurricane Katrina). Wetlands act as natural sponges, reducing flood peaks; wetland destruction increases flood risk. Flood forecasting uses river gauges, radar, and computer models. NOAA's Advanced Hydrologic Prediction Service provides flood forecasts. Flood insurance is separate from standard homeowners insurance. In the US, the National Flood Insurance Program (NFIP) provides flood coverage.

Drought is the correct answer! The Dust Bowl (1930s) forced millions of "Okies" to migrate to California (as depicted in John Steinbeck's "The Grapes of Wrath"). The 2012-2016 California drought was the worst in 1,200 years. Droughts can lead to water restrictions, reduced hydroelectric power, and increased fire risk. The U.S. Drought Monitor tracks drought conditions. Droughts are classified as moderate, severe, extreme, or exceptional. Heatwaves are defined relative to local climate (e.g., 90°F in Seattle is a heatwave; 90°F in Phoenix is normal). The urban heat island effect makes cities hotter than surrounding rural areas (due to asphalt, buildings, lack of trees). The deadliest heatwave in U.S. history was 1936 (5,000 deaths). India and Pakistan experience deadly pre-monsoon heatwaves (2015 India heatwave killed 2,500). Wet-bulb temperature (humidity + temperature) is a better measure of heat stress: humans cannot survive prolonged exposure to wet-bulb temperatures above 35°C (95°F). Climate change increases the frequency and intensity of both droughts and heatwaves. Flash droughts develop rapidly (within weeks) due to high temperatures and low humidity. Wildfires often follow droughts and heatwaves.

Blizzard is the correct answer! The National Weather Service defines a blizzard by wind and visibility criteria, not snowfall amount. The 1993 "Storm of the Century" affected 26 U.S. states and killed 300 people. The 2016 blizzard (Winter Storm Jonas) dropped over 30 inches (76 cm) of snow in parts of the East Coast. Lake-effect snow occurs downwind of the Great Lakes when cold air picks up moisture and deposits it as heavy snow (Tug Hill Plateau, New York receives over 200 inches / 5 meters annually). Ice storms (freezing rain) can be more dangerous than snow because ice accumulation causes power outages, tree damage, and travel hazards (catastrophic ice storm in Quebec, 1998). The "Polar Vortex" is a large area of low pressure and cold air around the Arctic that can dip southward, causing extreme cold spells (2014, 2019). Wind chill index measures the "feeling" of cold on exposed skin (risk of frostbite). Hypothermia (body temperature below 95°F / 35°C) can be fatal; frostbite damages or kills tissue (can lead to amputation). The coldest temperature ever recorded on Earth is -128.6°F (-89.2°C) at Vostok Station, Antarctica (1983). Staying safe in blizzards: stay indoors, avoid overexertion (heart attacks from shoveling snow), use flashlights (not candles) to avoid fire risk.

Thunderstorms produce hail! Hailstones have concentric rings (like an onion) from multiple trips through the updraft. Hailstones can be smaller than peas (0.2 inches / 5 mm) or larger than grapefruits (over 4.5 inches / 11 cm). Hail can fall at speeds exceeding 100 mph (160 km/h). Severe hail is defined as hail at least 1 inch (2.5 cm) in diameter (quarter-sized). Hail causes over $1 billion in property and crop damage annually in the United States. The most hail-prone area in the world is the "Hail Alley" of the Great Plains (Nebraska, Colorado, Wyoming). Hail can injure or kill livestock and people (do not go outside during severe thunderstorms). Hail damage to roofs may not be visible immediately; many insurance policies cover hail damage. Climate change may increase hail frequency in some regions (more energy for updrafts) and decrease it in others (higher freezing levels). Hail can be recorded by dual-polarization radar (which can detect hailstones vs. raindrops). The largest hailstone ever recorded worldwide fell in Gopalganj, Bangladesh (1986) – estimated size over 2.2 pounds (1 kg). Hail suppression (cloud seeding with silver iodide) has been attempted but effectiveness is disputed. Hail nets are used to protect crops and solar panels in hail-prone areas.

Climate change is the correct answer! The Intergovernmental Panel on Climate Change (IPCC) concluded that human influence has increased the frequency and intensity of extreme weather events. Attribution science can now determine how much climate change contributed to specific events (e.g., the 2021 Pacific Northwest heatwave would have been virtually impossible without climate change). Sea level rise (from melting ice and thermal expansion) increases coastal flooding and storm surge damage. The number of billion-dollar weather disasters in the U.S. has increased dramatically (from an average of 6 per year in the 1990s to over 20 per year in the 2020s). Wildfires are fueled by hotter, drier conditions; the 2020 California wildfire season burned over 4 million acres (record). The 2019-2020 Australian bushfire season killed 33 people and over 1 billion animals. Climate models project further increases in extreme weather with continued warming. Mitigation (reducing greenhouse gas emissions) and adaptation (building resilience) are both needed. The Paris Agreement (2015) aims to limit warming to well below 2°C (preferably 1.5°C). Reducing fossil fuel use, switching to renewable energy, improving energy efficiency, and protecting forests are key strategies. You can help by reducing energy use, driving less, eating less meat, and supporting climate-friendly policies.

Turn around, don't drown! Just 6 inches (15 cm) of moving water can knock you off your feet; 12 inches (30 cm) can float most cars; 18-24 inches (46-61 cm) can float SUVs and trucks. Water can hide washed-out roads or bridges. It is impossible to know the depth or current strength. The safest action is to turn around. Other safety tips: stay informed (NOAA Weather Radio, mobile alerts), have an emergency kit (food, water, medications, batteries, first aid), make a family communication plan, and practice drills. For tornadoes: mobile homes are not safe; go to a pre-identified sturdy building. For hurricanes: know your evacuation zone and route; board windows with plywood (not tape). For lightning: avoid open fields, hilltops, isolated trees, and water. For heatwaves: check on elderly neighbors; pets need shade and water. For blizzards: never run a generator indoors (carbon monoxide poisoning). The Federal Emergency Management Agency (FEMA) and National Weather Service provide free safety resources. Your local emergency management office may offer free weather radios. Being prepared can save your life and the lives of others.