Blast, the best thing for your roof in an emergency is to keep a roll of roofing (black paper) felt and a bag or two of similar shingles and of course the shingle nails and felt circular head nails. The reason I said this is during 3 hurricanes in fla, we had a old 3 tab roof and the 110 mph wind started stripping it off. During each storm that blasted through here I climbed up on the roof and put new felt and shingles back in to keep the roof from getting breached. The next hurricane came through and took off some more in a different location. After all 3 hurricanes came through I ended up replacing 300 square feet of roof. We waited 6 months to get a contractor to replace the old roof (paid for by insurance) and never had any water breached through the 300 Sq Feet that was gone. The people I knew who just left tarp and wood planks had water damage and some led to mold. Trust me you don't want mold started in your house. Shingling is a lot easier than people make it out (did it when I was young as well as a carpenter)and in my opinion the best way to maintain the water integrity of your house until it can be re shingled. The cost is really not that bad and lasts longer than tarps. Ozone kills tarps. If your serious about protecting your roof, this is the best way I know to do it and your repairs restore the roof better than original giving you time to get a new roof or leaving that way with no water breaches.

Side note: It didn't take me long to do this while on the roof in the rain with a repelling rope on tied to a palm tree to keep me from sliding off the roof. It was the only way U could stay on it two story's off the ground, I looked like an idiot but we had the least amount of damage in the neighbor hood.