Part of the duties of a weather spotter is observation. And I have noticed several things worth mentioning. Have you?

In a previous column, I mentioned a possible shift in wind currents and their effect on our climate and weather. In a recent weather bulletin, the NWS meteorologists mention a shift in the upper level wind currents. This shift has affected us and has kept us continued dry.

It's caused another unusual phenomena. In over 43 years in Hesperia, I have watched year by year how the smog has increase. Suddenly this year the smog is almost gone. Why? The upper level winds have driven it back out of the Victor Valley. Much like a sustained "Santa Ana" condition, only mostly without the high wind and low humidity.

The NWS also mentions a return to a dry cycle, which they have observed in past years. They hazard a guess that we may be moving into a cold phase of the Pacific Decadal Oscillation (or PDO), which would produce a prolonged period (greater than 25 years) of drought. I believe, however, that the upper level wind shift is gradually abating. We might have a normal to wet fall and winter upcoming.

How would this affect my observed "summer-winter rainfall cycle"? This prediction of mine was formulated almost 30 years ago and has, with only minor fluctuations, held true since then.

I've heard a lot of people complaining this is the hottest summer they've ever seen. Not so! We've actually had a cooler-then-average summer. April, May, June and July have been much cooler than average. In Hesperia, for instance, we had only eight days with a high exceeding 100 degrees and the hottest it's been is 106, when we should have 110 degrees or above on most days. The humidity, however, has been higher that normal. Humidity plus temperatures equals a high "heat index," a measure of how hot it feels.

Regarding fall and (especially) winter rainfall, I am relying on my own "summer-winter rainfall cycle" - i.e. little rain in the summer equals more in the winter and vice versa. And I know I said the same thing last year but I didn't know about the upper level wind shift. So we will see. For the moment, enjoy our (mostly) smog-free mountains!