Funnel clouds look like cone-shaped or thin rope-like protuberances which hang down from the cloud base, and often do not last very long.

BBC: Funnel clouds, twisters, tornados: What are they?

Even if Celebrex and Bextra don't make it through the meeting, Pfizer could look like a winner to investors as long as it doesn't face a massive liability cloud like the ever-ballooning diet-drug litigation that has weighed on smaller rival Wyeth (nyse: WYE - news - people ) for years.

FORBES: Judgment Day For The FDA, Pfizer