my comment to Ray & my original post here, whilst appearing totally flippant is probably pretty accurate in actual fact! I'd challenge Ray or anyone else to produce proof of any predictions/analyses that stand up to real scrutiny.I've been on record as saying that certain weather conditions are the types we get more interested in, but tbh they fall flat just as often.& the number of times when so-called poor seeing conditions turn out far better than anticipated is pretty much comparable insofar as they turn out decent - possibly! The difference between good geographic locations and bad ones are that the good locations might have good seeing 5-10% of the time, and the bad locations will have 0%.Įdited by Tom Glenn, 14 August 2020 - 10:36 PM. People that showcase good images are only showing a small percentage of their total data. So you really never know, and it is a numbers game. But I've encountered many times in which all the forecasts were for good seeing, the weather was coming from the west, with minimal jet stream influence, and the seeing was still very bad. However, if the winds change, and the weather comes from the east, which is from the Arizona desert, the seeing is always very bad. This often leads to good seeing, but still only a small percentage of the time, depending mostly on the position of the jetstream.
the prevailing weather patterns usually come from the west, from the Pacific Ocean. In general, for me it is a coin toss, although there are certain conditions which are guaranteed to be bad.