Suicide prevention training for the prison service in England and Wales has been criticized. STORM is a package emphasizing the practice and review of interactions with suicidal persons and was evaluated in a pilot study for use in prisons. Trainees completed questionnaires immediately before and after training and at 6 to 8 months follow-up. Training significantly improved attitudes, knowledge, and confidence, and improvements were maintained at follow-up. Satisfaction with training was very high. STORM was successfully adapted for prison settings, and showed good effects among staff trained. It should be provided to the wider prison estate, with regular refresher training.