Rare Cloud Formations

There seem to be an increasing number of reports of strange clouds being sighted, often in association with earthquakes and of course, big storms. Before the 8.0 Sichuan quake of 2008, photos were taken of strange luminescent 'rainbow' clouds near the epicenter, and this phenomenon has reportedly occurred with more recent quakes.

We're also hearing more frequently about unusual cloud formations, sometimes associated with severe weather systems that later manifest in the region. While these formations look extremely strange to the average person, Nephologists (meteorologists specializing in clouds) seem to be familiar with most of the formations, which have names and descriptions.

It would be helpful to know if there's a measurable correlation between the appearance of rare or unusual clouds and earthquakes, mega-storms, magnetospheric activity, or meteors – in other words, a correlation between strange clouds and the possible influences of Planet X.