Aha - I think I see ... the graph shows the layman's "calm before the storm" - after the storm has passed!!
But the wind alone shows that (from steady low to increasing) - as does the change in pressure alone (from falling to rising). What would be interesting would be to know the locations of high and low pressure in relation to the measuring station location .... Would be interesting to see what happened after 8pm - when pressure was still rising, but wind has started to fall ...... Guess I'll just put my head back in the sand where it belongs .... On Monday, 17 April 2017 07:42:04 UTC+3, Alec Bennett wrote: > > > On Sun, Apr 16, 2017 at 7:05 PM, Thomas Keffer <[email protected] > <javascript:>> wrote: > >> Sorry, but it is not possible. >> >> It's been asked for many times, but would require a pretty substantial >> rewrite of weeplot, as well as some creative use of ConfigObj. >> >> Your hack is actually not so crazy. >> > > Well alright then, liberal amounts of duct tape have been applied! See > attached. > > [image: Inline image 1] > > I still need to clean it up a bit and maybe not show gusts as well, and > change the color scheme, but that's the work in progress. > > > It's been asked for many times > > In that case I'll mention that my method was to edit genplot.py and > imagegenerator.py so if a filename has "-trans" in it, it builds just the > plot line on a transparent background with no labels. And every time a > regular graph is built it searches for a file with the same name but > "-trans" appended to it, and if found pastes it over the current graph. So > in the above example it built a transparent version of the barometer graph > with no labels and then pasted it over the wind graph. It's a kludge but it > works, and it required as little hard coding of parameters that I could > think of. > > Let me know if there's interest and I'll post this hack to my github page, > but fair warning it's *very* hacky, and currently it doesn't have the > ability to draw the Y axis labels for the 2nd item (in this case the > barometer). And of course it's not a regular user extension so it'll get > overwritten with any weewx updates. > > > Just out of curiosity - is there a specific reason for plotting > windspeed/wind gust together with pressure? > > So we can see fronts moving through, which affect the wind speed, or so > our theory goes. Together with the wind direction vector chart, which is > shown right below this in the iOS app I'm working on, people can get a > good idea of weather changes with just two graphs. At least that's our > theory. And a biggie for us is that we're duplicating some functionality > from the Bodega Marine Lab near us (run by the University of California at > Davis), which has this same chart. > > [image: Inline image 2] > > But > > > > > > >> >> -- You received this message because you are subscribed to the Google Groups "weewx-user" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
