14 CFR § 121.617

If the weather conditions at the airport of takeoff are below the landing minimums in the certificate holder's operations specifications for that airport, no person may dispatch or release an aircraft from that airport unless the dispatch or flight release specifies an alternate airport located within the following distances from the airport of takeoff:

Aircraft having two engines. Not more than one hour from the departure airport at normal cruising speed in still air with one engine inoperative.

Aircraft having three or more engines. Not more than two hours from the departure airport at normal cruising speed in still air with one engine inoperative.

For the purpose of paragraph (a) of this section, the alternate airport weather conditions must meet the requirements of the certificate holder's operations specifications.

No person may dispatch or release an aircraft from an airport unless he lists each required alternate airport in the dispatch or flight release.