Thanks to all contestants for your entries to a subject that is such a favourite of mine. It's not been easy to come to a conclusion.
The honorary mentions - in no particular order - are:
Nick Vivian - Storm coming to FjÀllbacka
Luxun 54 - Zabriskie Point at sunset
Clyne - Storm clouds on Bintan
I love your Alona Beach storm image a lot as well, but the clouds in the Bintan image are very intriguing.
Third place: Jarek M - On the edge of thunderstorm cloud. Brighton beach, Melbourne
Second place: Juan Leon - Arcoiris
First place: Marcel de Jong
A wonderful panoramic composition of great quality.
Congratulations to all, especially to Marcel: I'm looking forward to your contest's subject.