ummm, first thing first, buy some contractor garbag bags, theyre a lil more heavy than the regular ones, i forget waht mm thick they are, like 7-9mm thick
and then get some tent stakes and some bungie cords to secure the stand wether youre FOB or just in a windy situation
a small umbrella found at wal-mart may be a good thing to have too
and what i always do is, buy the small walmart portable, foldup table too, put the table up, set up equipment however you will on the table, put contractor bag over the table and everything on it(it should fit perfectly over the walmart table), and run your mic cables UP to the table so that no water can get up on the table
ive taped thru some NASTY weather like that, and it hasnt gone anywhere
did i explain that well??
after the small amount of money spent at walmart(5 bux for each the table and umbrella, about 5-10 bux for a BOX of contractor bags-these can make quick friends in the section, and a few bux for tent stakes/bungie cords) and you are pretty much indestructible, and about as w00k pr00f as you can get!!