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A storm which is rare, usually rare storms kill many people as they are so unusual. The main rare storm will pwn you in any game of halo
Example 1
Guy 1 - WTF was that
Guy 2 - Oh shit that was Rare Storm
Rare Storm - Double Kill kthx
Guy 3 - HEY!!!~!
Rare Storm - Triple Kill
Guy 4 - o noes
Rare Storm - Overkill bitches

Example 2 - Rare Storm kills 200 billion people in Asia
by Rare Storm October 09, 2008