According to the San Francisco Chronicles Susan Slusser, the Oakland A's and Boston Red Sox may have to play a double-header due to the fact that hurricane Irene is taking a path that will likely reach land in the Boston area:
I am hearing there is the possibility of the #Athletics and #RedSox playing a doubleheader on Saturday. Internal discussions in Boston.less than a minute ago via Twittelator 
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Susan Slusser
susanslusser
Having to stop a game due to some rain is one thing, but when a hurricane is heading your way, you should probably take every precaution possible, like skipping a day and playing a double-header. We will just have to wait and see what Mother Nature feels like doing.
For more on the A's, head over to Athletics Nation.