Associated Press - May 8, 2009 6:14 PM ET

CARBONDALE, Ill. (AP) - Severe storms forced the cancellation of some commencement ceremonies today at Southern Illinois University's Carbondale campus.

University spokesman Rod Sievers (SEE'-vers) says power is out, hundreds of trees are down and many dorm windows are broken. But there were no injuries on .

Sievers says if power returns, commencement ceremonies scheduled for tomorrow will go on as planned.

It's finals week at SIU-Carbondale, and many students have left campus because they were finished with tests.

More than 33,000 Ameren customers are without power, mostly around Carbondale, Marion, Herrin.

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