Related Clues:

• Peril at sea
• Besiege
• Ominous forecast
• Squall
• Tornado or hurricane
• Attack en masse, as a castle
• Lightning producer
• Dark-clouds bringer
• One can be tracked
• Cloudburst
• Attack in a big way
• Attack en masse
• Rainout cause
• Weather disturbance
• 11 on the Beaufort scale