http://www.texashomeeducators.com/volcano.htm

Two of nature's most spectacular forces produced an incredible brew in the skies of Chile as a volcanic eruption met a lightning storm. Tons of dust and ash from the eruption of the Chaitn volcano poured into the night sky just as an electric storm passed overhead. The resulting collision created a spectacular sight as lightning flickered around the dust cloud amid the orange glow of the volcano.

http://www.news.com.au/perthnow/story/0,21598,23663936-948,00.html

http://www.timesonline.co.uk/tol/news/environment/article3883087.ece

Thanks to Bill Greening.