The forecasts take into account el Nino and la Nina, ballooning greenhouse gas levels as well as solar effect and natural variations in the world's oceans.
这些预报考虑到了厄尔尼诺现象、拉-尼娜现象、不断增长的温室气体水平以及太阳活动和全球海洋的自然变化。
La Nina is essentially the opposite of an El nino.
拉尼娜本质上就是个相反的厄尔尼诺。
La Nina tends to steer winter storms over the northern states, and El Nino more typically brings storms across the southern tier of the nation.
“拉尼娜”在北部各州会产生冬季风暴，“厄尔尼诺”则倾向于产生能够横跨国家南部各层的风暴。
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