In my opinion in this specific statement the part Except in an emergency... is only applicable on snow covered areas. Let me know what you think.
I think your FCOM has a couple paragraph formatting characters missing. Happens all the time when a busy Flight Ops office transcribes material into its Ops Manual.
You gotta be careful you don't read things "too hard" until they say what you'd like them to say.
Example: I can find a passage in the Bible that says
"There is no God."
Psalms 14:1, right there in black and white.
Read it hard enough (and ignore the preceding "A fool says in his heart...") and you have a great argument starter at your next overnight... or do you?