Some big changes are coming our way. The storm track, which for much of May has been well to our north, will drop down for the next week or so, dropping both temperatures and occasional valley rain and mountain snow. For Wednesday, valley temperatures will drop back into the 60s with occasional showers and brisk winds. Snow levels on Wednesday will be quite high, above 8,500′, but those will fall quickly on Thursday, likely to about Lake Tahoe level. Travel over the passes on Thursday could be challenging, and a Winter Storm Warning has been posted on the west side of the Sierra. The valley will see Thursday highs drop to the 50s with rain likely, especially on the west side, as there will be some shadowing. Temperatures rebound a bit into the weekend, but occasional showers are in the extended forecast.