The smartphone app Next Spaceflight can provide many technical details about scheduled and past rocket launches anywhere in the world. Filters can also be applied to select only specific agencies and specific launch locations, for example, the Vandenberg Space Force Base. In addition, the app can provide text notifications one day, one hour and ten minutes before launch. The app also provides a link to watch near real-time video of most launches. Military secrecy limits information on Minuteman launches.

People who know more about this should be consulted but I believe that distant sonic booms are more likely when there is a temperature inversion (warmer air above cooler air) and the sound is reflected between the warmer layer and the ground. Other possible factors in sonic booms include low surface wind speeds, temperature, humidity, wind turbulence, wind direction etc.