word | | Natural hazards |
| hot | Guinea-Bissau | hot, dry, dusty harmattan haze may reduce visibility during dry season; brush fires |
| hot | Libya | hot, dry, dust-laden ghibli is a southern wind lasting one to four days in spring and fall; dust storms, sandstorms |
| hot | Mali | hot, dust-laden harmattan haze common during dry seasons; recurring droughts; occasional Niger River flooding |
| hot | Mauritania | hot, dry, dust/sand-laden sirocco wind blows primarily in March and April; periodic droughts |
| hot | Togo | hot, dry harmattan wind can reduce visibility in north during winter; periodic droughts |
| hot | 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 |
| hotspot | Iceland | earthquakes and volcanic activity volcanism: Iceland, situated on top of a hotspot, experiences severe volcanic activity; Eyjafjallajokull (elev. 1,666 m) erupted in 2010, sending ash high into the atmosphere and seriously disrupting ... |
| hours | French Southern and Antarctic Lands | ... da India is a maritime hazard since it is under water for a period of three hours prior to and following the high tide and surrounded by reefs volcanism: Reunion Island - Piton ... |
| houses | Kuwait | ... 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 and ... |
| Howland | 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 ... |
| hr | Congo, Democratic Republic of the | ... million people; the volcano produces unusually fast-moving lava, known to travel up to 100 km /hr; Nyiragongo has been deemed a "Decade Volcano" by the International Association of Volcanology and Chemistry ... |
| Huaynaputina | Peru | ... activity in the Andes Mountains; Ubinas (elev. 5,672 m), which last erupted in 2009, is the country's most active volcano; other historically active volcanoes include El Misti, Huaynaputina, Sabancaya, and Yucamane |
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