word | | Natural hazards |
| air | Canada | ... to development; cyclonic storms form east of the Rocky Mountains, a result of the mixing of air masses from the Arctic, Pacific, and North American interior, and produce most of the country ... |
| Alaska | United States | ... the Atlantic and Gulf of Mexico coasts; tornadoes in the midwest and southeast; mud slides in California; forest fires in the west; flooding; permafrost in northern Alaska, a major impediment to development |
| Almaty | Kazakhstan | earthquakes in the south; mudslides around Almaty |
| Ambae | Vanuatu | tropical cyclones or typhoons (January to April); volcanic eruption on Aoba (Ambae) island began 27 November 2005, volcanism also causes minor earthquakes; tsunamis |
| America | Pacific Ocean | ... frequent from July to October); tropical cyclones (hurricanes) may form south of Mexico and strike Central America and Mexico from June to October (most common in August and September); cyclical El Nino ... |
| American | Canada | ... Rocky Mountains, a result of the mixing of air masses from the Arctic, Pacific, and North American interior, and produce most of the country's rain and snow east of the mountains |
| Amsterdam | French Southern and Antarctic Lands | Ile Amsterdam and Ile Saint-Paul are inactive volcanoes; Iles Eparses subject to periodic cyclones; Bassas da India is a maritime hazard since it is under water for a period of three ... |
| Andes | Argentina | San Miguel de Tucuman and Mendoza areas in the Andes subject to earthquakes; pamperos are violent windstorms that can strike the pampas and northeast; heavy flooding |
| annual | Southern Ocean | ... ice (generally 0.5 to 1 m thick) with sometimes dynamic short-term variations and with large annual and interannual variations; deep continental shelf floored by glacial deposits varying widely over short distances ... |
| Antarctica | Antarctica | ... over the ocean and move clockwise along the coast; volcanism on Deception Island and isolated areas of West Antarctica; other seismic activity rare and weak; large icebergs may calve from ice shelf |
| any | Kiribati | typhoons can occur any time, but usually November to March; occasional tornadoes; low level of some of the islands make them sensitive to changes in sea level |