Amador County - A spell of warm, dry weather has forced two Sierra ski resorts to postpone their season openings. Heavenly and Kirkwood resorts had planned to open this week after a wet start to November. But a week of warm and dry weather during the middle part of the month has pushed back their opening dates to at least Thanksgiving weekend. Heavenly, which has Lake Tahoe's most expansive snowmaking operation, announced on its Web site that the resort will open when conditions allow. “The forecast for the next five days calls for a cooling trend that should give us better snowmaking temperatures,” said resort spokesman Russ Pecoraro. Kirkwood said it will open Thanksgiving weekend, conditions permitting. With the recent high temperatures, resorts have been unable to maximize their snowmaking capabilities. Staff Report (This email address is being protected from spambots. You need JavaScript enabled to view it.).