It is under weather condtion.

来源: 于 2015-02-17 11:11:08 [博客] [旧帖] [给我悄悄话] 本文已被阅读：次

Feb 14th weather.com did predict WHITEOUT condition, since it is not everywhere and only short time period, it only put as warning. I saw the word but thought it is only WARNING and should be okay!
Normally it won't continue more than 30 minutes, so if you had it, just wait for it to end!