When it’s storming, it’s a great time to farm Combat Sectors (e.g. Mt. Magnus, Resol Forest). During rain, PSE Burst levels are automatically higher. Even after defeating the boss after a PSE Burst Climax, you don’t have to start from an empty PSE Burst gauge. Continue rushing to E and T markers to trigger PSE Burst Climax. Repeat this process as many times as possible to take advantage.