70 percent of US under winter warning as freeze hits

A historic and brutal winter storm put some 240 million Americans under weather warnings Friday as the United States faced holiday travel chaos, with thousands of flights canceled and major highways closed.

Linking African winds to Atlantic storms

High above the northern tropical countries of Africa, in warmer months, waves of low pressure can form in the atmosphere and blow westward toward the Atlantic. When these African easterly waves reach the ocean, tropical cyclones—including ...

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