A Hurricane for Irene

• 
• 1 cup dark spiced rum
• 1cup light rum
• 10 oz grenadine syrup
• 2 cups OJ
• 1 can limeaid concentrate
• 1/4 cup simple syrup
• 1 large orange, cut into 1/4-inch thick slices
• Drink Umbrellas

Stir together all ingredients and serve over lots of ice in big glasses.  Makes enough for a small hurricane festivity...double/triple if needed.