Related Clues:

• Clouds (up)
• Visibility reducers
• They may roll in
• Thick mists
• Obscures, with ''up''
• Obscuring hazes
• Turns opaque, with "up"
• Visibility-reducing mists
• Clouds, as the mind
• Steams (up)
• London forecasts
• ___ up (becomes hazy)
• Confused mental states
• They can be hard to drive in
• Horror film effects