yep, when you 1st see something coming up like that, the best thing to do is get started re-securing that tarp, looking at how you think the wind is going to probably hit hardest.
grab your rain jacket & have it ready to put on if the rain starts before you finish.
also look around for any thing else that might blow away or get wet.
i've used good size logs (or rocks), laid on top of the tarp lines on the wind ward side, or even looped the tarp line around the log forming a clove line hitch before continuing on to the stake, tree, limb, root, rock, or what ever looks best for holding down the fort.
if the wind can move the log or rock that's on the line, the weighted object provides a little more forgiveness on the line & tarp corners. ...tim
don`t leave the CREATOR out of the creation!