Quote:
Originally Posted by philiphart
What do you mean by the jetstream being steady? I'm not sure that we can characterise what you mean from model data.
Phil
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Simplistic term for all in one direction and equal velocity across a large area. No disturbances such as when the jet stream has drifted north and you get the less uniform flow under the curve when it exists. I guess the observation I was trying to illustrate was that as long as the upper level winds are of relatively constant velocity, in one direction, the next major contributor to seeing will most certainly be low level winds, as they would have a higher thermal variation from being close to the ground, and when unstable, would be very similar to thermal disturbances on a hot day. If moving at a relatively constant velocity and direction, the variations might be less apparent. All very subjective, based on recent observations.
I also agree that individual experiences will vary according to the micro-climates that exists. I'm slowly building a perception of which macro weather patterns positively influence my immediate micro-climate in the Gosford area. One day soon I'll actually start capturing daily data locally and correlating it to the larger area forecasts, to be able to make a go/no-go decision about setting up for a evening of observing.