There's a substantial amount of scientific and colloquial evidence regarding earthquake clouds.
New
Scientist recently talked about it - but there is a lot more information online.
the biggest problem, if you can bring yourself to accept that there is an as-yet unexplained connection, is that the predictive ability is limited to
being able to say yes/no to the possibility of an earthquake. There is no timeframe (up to 60 days has been mentioned), and there is no indication of
the strength of the quake, and furthermore, there is no solid link between the cloud formation and the epicenter of the quake.
Take a look at this Jpeg from the OP's youtube link:
img223.imageshack.us...
this shows the time and location of the videos - one is 10 minutes before the quake, and 550km away. the other is 30 minutes and 450km away.
IF they are linked to the quake, they're a long way away and random enough that no possible information could have been provided to evacuate people
(I note this, because many people seem to be bringing this story up here and elsewhere as some kind of anti-Chinese gov't point). As to HAARP... I
seriously doubt it. The conspiracy theory is that the project manipulates the weather - and all of the research suggests that if the clouds are linked
to the quakes, they are as a by-product of ground conditions, as opposed to the cause of the quake.