Huh, my observations have been different. I lose TV even before the rain and wind starts (trees make any wind quite visible), just because the dense dark rain clouds are blocking the signal path. The rain typically starts a couple minutes later.
For digital TV there's an incentive to maximize bandwidth. So they're going to trade off signal:noise to get 99.99% (1-10 minutes/mo), but not 99.99999%. Especially since as you say, the wind will result in some signal interruptions anyway!