Below are commonly asked questions about this spell. Some of the information is pulled official D&D sources (such as books and the twitter feeds of D&D officials), but other information is derived from forums and online discussions. As always, it is up to the DM to decide how they wish to spell questions. If you have a FAQ about this spell that you feel other DM's may wish to know, please send us the message!
Your movement can include jumping, climbing and swimming. These different modes of movement can be combined with walking, or they can constitute your entire move. However you are moving, you deduct the distance of each part of your move from your speed until it is used up or until you are done moving.
When Booming Blade refers to moving, it means movement in the game's normal sense
Question: For Booming Blade, did you intend for standing up from prone to trigger the extra damage? It costs movement.
Crawford's Answer: Standing up costs movement but moves you nowhere. To move while prone, you crawl or use magic (PH, 191).
Below is information about this spell as it relates to other planes and area of effects (i.e. underwater). Some of the information is pulled official D&D sources (such as books and the twitter feeds of D&D officials), but other information is derived from forums and online discussions. As always, it is up to the DM to decide how they wish to handle spell effects.
None of the thunder spells mention water interaction in any way. In addition, the section in the PHB about underwater combat (pg. 198) doesn't mention anything about thunder spells behaving differently in water. So officially, there are no rules amplifiying or diminishing the spell effects. In addition, Jeremy Crawford has made a comment regarding a fireball in water that relates to this subject, "Nothing in the rules causes a fireball to vaporize water. Magic ≠ physics. DMs may apply whatever magical/scientific logic they like."