In flight icing is a complicated phenomena, and often has pockets inside of pockets. The over reliance on government freezing level predictions is a huge error that has caused many in flight icing fatal accidents. Be very careful about a blanket 12,000 foot freezing level report such as this. You can find yourself in heavy ice with warmer air above.
![](https://s2.save4k.ru/pic/fHQ422Qj1Rw/mqdefault.jpg)