Snow and DirecTV are not playing well together

[carbonel]

When I first got DirecTV, I was warned that the weather might have some effect on my reception. And indeed, during the worst snowfall accumulation, my picture went, well, snowy. That was the worst that ever happened.

But now that I have HD, the signal seems to go out ever time there's a serious snowfall. I don't have easy access to the dish on the roof. I don't even know for sure if that's the problem, though I'd really like to clear the snow out as an experiment. The last time this happened, I had no signal for three days. So far, it's just one evening, but there's more snow predicted for tomorrow.

I wonder if the 5-LNB oval dish that I have now is more susceptible to weather-related problems. It's my current hypothesis, at any rate.