jet stream

[badabing82]

anyone know of a good website that predicts the jet stream of maps it?

would be good to know so one can track possible nights or days of good seeing =o))))

perth preferred haha

[DavidU (Dave)]

On the left of this page click under resources,there is several jet stream sites. Skippy Sky is great.

[gb_astro]

http://wxmaps.org/pix/aus.jet.html

gb.

[badabing82]

thanks guys i just saw it in the resources section after i posted the message haha =o)

how accurate does skippy tend to be with seeing predictions ?

[mswhin63 (Malcolm)]

They have been reasonably accurate with me, but not 100%.

[asimov (John)]

Roughly 50% accurate for me.

[Paul Haese]

Skippy sky is totally inaccurate with regard to seeing. Seeing is often defined by not only jet stream activity but also the middle and lower layers. The lower layers can also be influenced by topography such as mountains or hills. Skippy sky takes non of this into account; Andrew and I have had several discussion on this matter and his seeing purely relies on GFS data.

For jet stream maps, take a look at the ones below but please treat them with grain of salt most of the time. Predictions are one thing but actually being out and visually testing the seeing is another. If it is clear and no scintillation visually then take a look with an ambient scope.

http://wxmaps.org/pix/aus.jet.html

the one above is good for summer predictions. Much more consistent.

http://weather.unisys.com/gfs/gfs.ph...egion=au&t=4p1

This one above is generally used by planetary imagers, site recommended by Damian Peach. Best predictions during Winter and cooler months.

http://weather.wvec.com/auto/wvec/gl...JetStream.html

This one above sometimes co-incides with the other two but is like Skippy Sky; totally unreliable.

It's up to you what you want to use but most are really guide lines.

[pgc hunter]

Originally Posted by Paul Haese

Skippy sky is totally inaccurate with regard to seeing. Seeing is often defined by not only jet stream activity but also the middle and lower layers. The lower layers can also be influenced by topography such as mountains or hills. Skippy sky takes non of this into account; Andrew and I have had several discussion on this matter and his seeing purely relies on GFS data.

Yup, they always seem to predict 8/10 or better for Melbourne every night. As if

Skippy sky can be accurate, just subtract 8 from their predicted seeing value to get the real conditions for the night.