word | | Natural hazards |
| Aoba | Vanuatu | tropical cyclones or typhoons (January to April); volcanic eruption on Aoba (Ambae) island began 27 November 2005, volcanism also causes minor earthquakes; tsunamis |
| approach | South Georgia and the South Sandwich Islands | the South Sandwich Islands have prevailing weather conditions that generally make them difficult to approach by ship; they are also subject to active volcanism |
| April | Bolivia | flooding in the northeast (March-April) |
| April | Cocos (Keeling) Islands | cyclone season is October to April |
| April | Comoros | cyclones possible during rainy season (December to April); Le Karthala on Grand Comore is an active volcano |
| April | 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 ... |
| April | Mauritania | hot, dry, dust/sand-laden sirocco wind blows primarily in March and April; periodic droughts |
| April | Mauritius | cyclones (November to April); almost completely surrounded by reefs that may pose maritime hazards |
| April | Tonga | cyclones (October to April); earthquakes and volcanic activity on Fonuafo'ou |
| April | Vanuatu | tropical cyclones or typhoons (January to April); volcanic eruption on Aoba (Ambae) island began 27 November 2005, volcanism also causes minor earthquakes; tsunamis |
| April | Zambia | periodic drought; tropical storms (November to April) |
| arc | Turkey | severe earthquakes, especially in northern Turkey, along an arc extending from the Sea of Marmara to Lake Van |
| Arctic | Canada | ... 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 rain and snow ... |
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