Possible Clues:

• Make public aware portable plane affected by this
• Look! Little jumbo may fall in it
• Put out by small isolated area in Jumbo, one giving you sinking feeling?
• Local area of low pressure that causes a plane to lose height suddenly
• Cause of falling pressure in top-notch projectile
• Organised Rio packet? That's bound to cause turbulence!
• Sounds like heir on the snooker table is just as scary as The Hurricane and The Whirlwind for the high flyers
• Any flier might fall for it