Nope, those aren't clouds, folks!
Check out this shot of the last plane to leave from Heathrow before all incoming and outgoing flights were cancelled because of
that sneaky smoke monster from Lost potentially dangerous ash in the air blowing south from an erupting volcano in Iceland!
Apparently this is the second time this month that the volcano has erupted, and it lives under the Eyjafjallajokull glacier!
All British airspace is closed until 6pm tonight, but most airlines are refusing to operate until tomorrow morning at the earliest.
Sucks! Better to be safe than sorry, though!
[Image via WENN.]