word | | Natural hazards |
| Martinique | France | metropolitan France: flooding; avalanches; midwinter windstorms; drought; forest fires in south near the Mediterranean overseas departments: hurricanes (cyclones), flooding, volcanic activity (Guadeloupe, Martinique, Reunion) |
| masses | Canada | ... 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's ... |
| Mawson | Heard Island and McDonald Islands | Mawson Peak, an active volcano, is on Heard Island |
| maximum | United States Pacific Island Wildlife Refuges | ... the island can be a maritime hazard Kingman Reef: wet or awash most of the time, maximum elevation of less than 2 m makes Kingman Reef a maritime hazard Midway Islands, Johnston ... |
| May | Arctic Ocean | ... Ellesmere Island; icebergs calved from glaciers in western Greenland and extreme northeastern Canada; permafrost in islands; virtually ice locked from October to June; ships subject to superstructure icing from October to May |
| May | Atlantic Ocean | ... and the Madeira Islands; ships subject to superstructure icing in extreme northern Atlantic from October to May; persistent fog can be a maritime hazard from May to September; hurricanes (May to December |
| May | Norfolk Island | typhoons (especially May to July) |
| May | Pacific Ocean | ... the "Pacific Ring of Fire"; subject to tropical cyclones (typhoons) in southeast and east Asia from May to December (most frequent from July to October); tropical cyclones (hurricanes) may form south of ... |
| May | Southern Ocean | ... glacial deposits varying widely over short distances; high winds and large waves much of the year; ship icing, especially May-October; most of region is remote from sources of search and rescue |
| May | Vietnam | occasional typhoons (May to January) with extensive flooding, especially in the Mekong River delta |
| Mediterranean | France | metropolitan France: flooding; avalanches; midwinter windstorms; drought; forest fires in south near the Mediterranean overseas departments: hurricanes (cyclones), flooding, volcanic activity (Guadeloupe, Martinique, Reunion) |
| Mekong | Vietnam | occasional typhoons (May to January) with extensive flooding, especially in the Mekong River delta |
| Mendoza | 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 |
| meters | Southern Ocean | huge icebergs with drafts up to several hundred meters; smaller bergs and iceberg fragments; sea ice (generally 0.5 to 1 m thick) with sometimes dynamic short-term variations and with large annual ... |
| metropolitan | France | metropolitan France: flooding; avalanches; midwinter windstorms; drought; forest fires in south near the Mediterranean overseas departments: hurricanes (cyclones), flooding, volcanic activity (Guadeloupe, Martinique, Reunion) |
| Mexico | Mexico | tsunamis along the Pacific coast, volcanoes and destructive earthquakes in the center and south, and hurricanes on the Pacific, Gulf of Mexico, and Caribbean coasts |
| Mexico | Pacific Ocean | ... May to December (most 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 ... |
| Mexico | United States | tsunamis, volcanoes, and earthquake activity around Pacific Basin; hurricanes along the Atlantic and Gulf of Mexico coasts; tornadoes in the midwest and southeast; mud slides in California; forest fires in the west ... |
| middle | Dominican Republic | lies in the middle of the hurricane belt and subject to severe storms from June to October; occasional flooding; periodic droughts |
| middle | Haiti | lies in the middle of the hurricane belt and subject to severe storms from June to October; occasional flooding and earthquakes; periodic droughts |
| Midway | United States Pacific Island Wildlife Refuges | ... a maritime hazard Kingman Reef: wet or awash most of the time, maximum elevation of less than 2 m makes Kingman Reef a maritime hazard Midway Islands, Johnston, and Palmyra Atolls: NA |
| midwest | United States | ... activity around Pacific Basin; hurricanes along 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 ... |
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