In the western U.S., an arid spring with low snowpack can set the stage for an active summer fire season, whereas if rains come every 10 days far fewer fires than normal will erupt.

• 在美国西部，如果春天十分乾燥加上雪量不足，就可能是夏天火灾层出不穷的前兆，但是如果每10天都能有些降雨，火灾发生的次数就会大幅减少。