5. The computer-implemented method of claim 4 , wherein the notification activation code comprises an indicator that the relevance code is effective or an indicator that the relevance code is not effective, wherein if the notification activation code comprises the indicator that the corresponding relevance code is not effective, then modifying the relevance code according to the notification activation code comprises downgrading the relevance code prior to determining the one or more types of notifications to provide.
5. The computer-implemented method of claim 4 , wherein the notification activation code comprises an indicator that the relevance code is effective or an indicator that the relevance code is not effective, wherein if the notification activation code comprises the indicator that the corresponding relevance code is not effective, then modifying the relevance code according to the notification activation code comprises downgrading the relevance code prior to determining the one or more types of notifications to provide. 6. The computer-implemented method of claim 5 , further comprising determining a display and signaling level code corresponding to the relevance code, wherein providing the notification associated with the weather information according to the level of relevance for the target phase of flight comprises providing the notification associated with the weather information according to the display and signaling level code.