word | | Natural hazards |
| Nyos | Cameroon | volcanic activity with periodic releases of poisonous gases from Lake Nyos and Lake Monoun volcanoes |
| obscure | Botswana | periodic droughts; seasonal August winds blow from the west, carrying sand and dust across the country, which can obscure visibility |
| obscuring | Cape Verde | prolonged droughts; seasonal harmattan wind produces obscuring dust; volcanically and seismically active |
| obstacle | Canada | continuous permafrost in north is a serious obstacle to development; cyclonic storms form east of the Rocky Mountains, a result of the mixing of air masses from the Arctic, Pacific, and North ... |
| occasional | Brazil | recurring droughts in northeast; floods and occasional frost in south |
| occasional | Cambodia | monsoonal rains (June to November); flooding; occasional droughts |
| occasional | Colombia | highlands subject to volcanic eruptions; occasional earthquakes; periodic droughts |
| occasional | Coral Sea Islands | occasional tropical cyclones |
| occasional | Costa Rica | occasional earthquakes, hurricanes along Atlantic coast; frequent flooding of lowlands at onset of rainy season and landslides; active volcanoes |
| occasional | Djibouti | earthquakes; droughts; occasional cyclonic disturbances from the Indian Ocean bring heavy rains and flash floods |
| occasional | Dominican Republic | lies in the middle of the hurricane belt and subject to severe storms from June to October; occasional flooding; periodic droughts |
| occasional | French Polynesia | occasional cyclonic storms in January |
| occasional | Guatemala | numerous volcanoes in mountains, with occasional violent earthquakes; Caribbean coast extremely susceptible to hurricanes and other tropical storms |
| occasional | Haiti | lies in the middle of the hurricane belt and subject to severe storms from June to October; occasional flooding and earthquakes; periodic droughts |
| occasional | Hong Kong | occasional typhoons |
| occasional | Indian Ocean | occasional icebergs pose navigational hazard in southern reaches |
| occasional | Indonesia | occasional floods, severe droughts, tsunamis, earthquakes, volcanoes, forest fires |
| occasional | 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 |
| occasional | Korea, North | late spring droughts often followed by severe flooding; occasional typhoons during the early fall |
| occasional | Korea, South | occasional typhoons bring high winds and floods; low-level seismic activity common in southwest |
| occasional | Mali | hot, dust-laden harmattan haze common during dry seasons; recurring droughts; occasional Niger River flooding |
| occasional | Panama | occasional severe storms and forest fires in the Darien area |
| occasional | Samoa | occasional typhoons; active volcanism |
| occasional | Sri Lanka | occasional cyclones and tornadoes |
| occasional | 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 ... |
| occasional | Vietnam | occasional typhoons (May to January) with extensive flooding, especially in the Mekong River delta |
| occasional | Virgin Islands | several hurricanes in recent years; frequent and severe droughts and floods; occasional earthquakes |
| occasional | Wake Island | occasional typhoons |
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