word | | Natural hazards |
| hazard | 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 |
| hazard | Christmas Island | the narrow fringing reef surrounding the island can be a maritime hazard |
| hazard | French Southern and Antarctic Lands | ... 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 hours prior to and following ... |
| hazard | Indian Ocean | occasional icebergs pose navigational hazard in southern reaches |
| hazard | Pacific Ocean | ... Hemisphere and the western Pacific; ships subject to superstructure icing in extreme north from October to May; persistent fog in the northern Pacific can be a maritime hazard from June to December |
| hazard | Saint Pierre and Miquelon | persistent fog throughout the year can be a maritime hazard |
| hazard | Spratly Islands | typhoons; numerous reefs and shoals pose a serious maritime hazard |
| hazard | United States Pacific Island Wildlife Refuges | ... Baker, Howland, and Jarvis Islands: the narrow fringing reef surrounding the island can be a maritime hazard Kingman Reef: wet or awash most of the time, maximum elevation of less than 2 ... |
| hazards | Ashmore and Cartier Islands | surrounded by shoals and reefs that can pose maritime hazards |
| hazards | Mauritius | cyclones (November to April); almost completely surrounded by reefs that may pose maritime hazards |
| haze | Guinea | hot, dry, dusty harmattan haze may reduce visibility during dry season |
| haze | Guinea-Bissau | hot, dry, dusty harmattan haze may reduce visibility during dry season; brush fires |
| haze | Mali | hot, dust-laden harmattan haze common during dry seasons; recurring droughts; occasional Niger River flooding |
| haze | Qatar | haze, dust storms, sandstorms common |
| haze | Western Sahara | hot, dry, dust/sand-laden sirocco wind can occur during winter and spring; widespread harmattan haze exists 60% of time, often severely restricting visibility |
| Heard | Heard Island and McDonald Islands | Mawson Peak, an active volcano, is on Heard Island |
| heavy | Angola | locally heavy rainfall causes periodic flooding on the plateau |
| heavy | 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 |
| heavy | Cote d'Ivoire | coast has heavy surf and no natural harbors; during the rainy season torrential flooding is possible |
| heavy | Djibouti | earthquakes; droughts; occasional cyclonic disturbances from the Indian Ocean bring heavy rains and flash floods |
| heavy | Kuwait | sudden cloudbursts are common from October to April and bring heavy rain, which can damage roads and houses; sandstorms and dust storms occur throughout the year but are most common between March ... |
| heavy | Pakistan | frequent earthquakes, occasionally severe especially in north and west; flooding along the Indus after heavy rains (July and August) |
| Hemisphere | Pacific Ocean | ... cyclical El Nino/La Nina phenomenon occurs in the equatorial Pacific, influencing weather in the Western Hemisphere and the western Pacific; ships subject to superstructure icing in extreme north from October to ... |
| highlands | Colombia | highlands subject to volcanic eruptions; occasional earthquakes; periodic droughts |
| Hills | Montserrat | severe hurricanes (June to November); volcanic eruptions (Soufriere Hills volcano has erupted continuously since 1995) |
| Himalayas | Bhutan | violent storms from the Himalayas are the source of the country's name, which translates as Land of the Thunder Dragon; frequent landslides during the rainy season |
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