> Hi Bill, > > I goofed on the scale. On the Pickering scale, seeing is > typically rides between a 6 and 8. The scale I use, which is > close to Pickering, can be found at: > http://www.cmc.ec.gc.ca/cmc/htmls/seeing_e.html. This site is > pretty similar if not the same as the clear sky clock many people > use. I have found this seeing forecast to be pretty accurate, > and use their scale for comparison. When it predicts bad seeing, > it usually is, and the same is usually true for good seeing. > However, I have not put this to the test with observers in > different locations observing at the same time, as conditions > vary with the local terrain such as you noted. > > I have a condo in Scottsdale, and observe from my balcony (second > story)--the nearest mountain is about 10 miles away. I have > joked in the past the 10 feet of altitude is the source of good > seeing, and some believe that may actually be true, but I haven't > tested this either and am curious if there is any validity to the idea. > > Tonight, the seeing is suppose to improve in our area to a 4 on > their scale by midnight and will let everyone know if the > prediction holds true for this evening. > > -FRANK > -- See message header for info on list archives or unsubscribing, and please send personal replies to the author, not the list.