| Country | Natural hazards |
| Sweden | ice floes in the surrounding waters, especially in the Gulf of Bothnia, can interfere with maritime traffic |
| Switzerland | avalanches, landslides, flash floods |
| Syria | dust storms, sandstorms |
| Taiwan | earthquakes and typhoons |
| Tajikistan | earthquakes and floods |
| Tanzania | flooding on the central plateau during the rainy season; drought |
| Thailand | land subsidence in Bangkok area resulting from the depletion of the water table; droughts |
| Timor-Leste | floods and landslides are common; earthquakes, tsunamis, tropical cyclones |
| Togo | hot, dry harmattan wind can reduce visibility in north during winter; periodic droughts |
| Tokelau | lies in Pacific typhoon belt |
| Tonga | cyclones (October to April); earthquakes and volcanic activity on Fonuafo'ou |
| Trinidad and Tobago | outside usual path of hurricanes and other tropical storms |
| Tunisia | NA |
| Turkey | severe earthquakes, especially in northern Turkey, along an arc extending from the Sea of Marmara to Lake Van |
| Turkmenistan | NA |
| Turks and Caicos Islands | frequent hurricanes |
| Tuvalu | severe tropical storms are usually rare, but, in 1997, there were three cyclones; low level of islands make them sensitive to changes in sea level |
| Uganda | NA |
| Ukraine | NA |
| United Arab Emirates | frequent sand and dust storms |
| United Kingdom | winter windstorms; floods |
| 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; flooding; permafrost in northern Alaska, a major impediment to development |
| 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 m makes Kingman Reef a maritime hazard
Midway Islands, Johnston, and Palmyra Atolls: NA |
| Uruguay | seasonally high winds (the pampero is a chilly and occasional violent wind that blows north from the Argentine pampas), droughts, floods; because of the absence of mountains, which act as weather barriers, all locations are particularly vulnerable to rapid changes from weather fronts |
| Uzbekistan | NA |
| Vanuatu | tropical cyclones or typhoons (January to April); volcanic eruption on Aoba (Ambae) island began 27 November 2005, volcanism also causes minor earthquakes; tsunamis |
| Venezuela | subject to floods, rockslides, mudslides; periodic droughts |
| Vietnam | occasional typhoons (May to January) with extensive flooding, especially in the Mekong River delta |
| Virgin Islands | several hurricanes in recent years; frequent and severe droughts and floods; occasional earthquakes |
| Wake Island | occasional typhoons |
| Wallis and Futuna | NA |
| West Bank | droughts |
| 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 |
| World | large areas subject to severe weather (tropical cyclones), natural disasters (earthquakes, landslides, tsunamis, volcanic eruptions) |
| Yemen | sandstorms and dust storms in summer |
| Zambia | periodic drought, tropical storms (November to April) |
| Zimbabwe | recurring droughts; floods and severe storms are rare |
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