The West Coast blocking ridge that has brought warmer than normal temperatures for the past week or so will flatten temporarily as an upper-level trough moves around the ridge and sweeps across northern and eastern Arizona Tuesday to Tuesday night. An associated cold front will move through the area late Tuesday for a very slight chance of light showers in the Prescott area. Following the front, the skies will clear and temperatures will drop to near or below freezing on Wednesday morning and Thursday morning. Halloween night will be clear and cool with waning half-moon only visible after midnight.
The ridge will rebuild along the West Coast again later in the week, allowing temperatures to warm back up to above normal levels. Very little, if any, precipitation is expected this week, although we will see periods of mainly high clouds associated with disturbances moving around the ridge later this week and this weekend.
The outlook for the coming winter and spring continue to indicate the likelihood of El Niño conditions, however, and the equatorial Pacific ocean has become about 1 degree C or more warmer than normal over the past couple of weeks. Thus, we seem to be on track for a possibly wetter-than-normal winter and spring.
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Official National Weather Service forecast