A localized thunderstorm last week dumped an estimated 2 inches of rain on Wanship in an hour, flooding fields and Gracie’s Farm, a 1-acre food garden owned by the nearby Lodge at Blue Sky. Within 20 minutes, parts of the garden were under 18 inches of water that afternoon, resulting in a loss of about $10,000 in crops. “It was pretty terrible,” said Lynsey Gammon, the farm director. “It was so fast, too, that you couldn’t prevent it and you c…