Jon,
I shoot a lot of storm / tornado stuff, bad climate, end of the world type weather stuff. I have found the Tram TR-50 lav is about the best there is for moisture and bad climates. You can find them used on eBay for about $100 each. Ohh yea, they sound great too. I wouldn't use any other lav for the climate you'll be in for 2 years. Buy a couple back ups.
I shoot a lot of storm / tornado stuff, bad climate, end of the world type weather stuff. I have found the Tram TR-50 lav is about the best there is for moisture and bad climates. You can find them used on eBay for about $100 each. Ohh yea, they sound great too. I wouldn't use any other lav for the climate you'll be in for 2 years. Buy a couple back ups.