Departure Alternate??
Sec. 121.617 — Alternate airport for departure;
This section essentially states that if the WX is below approach minima then the flight must be dispatched or released with a departure alternate...
What I'm not clear on is the ambiguity given to the concept of detemining this. Say that, for instance, I am released for flight and while holding short of the runway for takeoff the WX decreases below this limit, in my mind since I have been already dispatched/released I do not need to obtain a departure alternate from dispatch/flight following. Am I correct in this interpretation?
I'm wondering because I commonly hear/see pilots calling for a takeoff alternate when this has happened in the past.