rankklein:
Now, speaking about alternate minimums: I know that once airborne, one can use his alternate down to minimums and doesn't need to have it above the alternate minimums (FAR 400-1/ 200-0.5 1 Navaid 2 Navaid rule).It's also written above. So, how come after taking off it changes?
The weather at your alternate has to continue to be forecast to remain at, or above, alternate minimums set forth in your ops specs, at all times during the flight. Once arriving at the alternate you may used the lowest published minimums.