iphone app for viewing quality?

[daslolo]

i'm in an area where cloudless sky doesn't always mean clear view because of air current above and moisture which the weather app doesn't account for

do you folks know of an app that gives a viewing index of the location?

[Phillips6549]

Not an app but a website

https://www.meteoblue.com/en/weather/outdoorsports/seeing/sheldon_united-kingdom_2638071

Set your own location obviously!

 

Mark

[daslolo]

ok im looking out of the window, it is overcast, the site confirms 3 layers and yet it calculates a viewing of 1.5 arcseconds, the same value tomorrow with no clouds

 

[Phillips6549]

My guess is that the 2 things (Cloud Cover and Seeing) are calculated independently.  If the clouds were not there the seeing would be excellent!

A prime example of S*d's Law in action!

 

Mark

[daslolo]

ok, I guess they calculate viewing as a function of jet stream speed

it's very useful, thanks Mark