In the United States, a voluntary weather observer who maintains a weather station and supplies data to the National weather Service without remuneration.
志愿的天气观测者(常见于美国)。他们维护一个天气观测站，并无偿给国家天气局提供数据。
The national weather service says 71% of the United States is covered by snow.
国家气象局表示，美国71%的国土被冰雪覆盖。
The situation is likely to get worse as the National Weather Service warns 25 to 50 centimeters of snow could fall on the northeastern United States between Tuesday and Wednesday.
但是情况可能会变得更糟；美国国家气象局警告说，从星期二到星期三，美国东北部降雪可能达到25到50厘米。
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