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News: SCWN has updated the Mesomap with new features, like the inclusion of Gust Speed, Dew Point, station's home town name.
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 on: September 10, 2009, 10:28:01 PM 
Started by Budgie - Last post by carseman
The real thanks must go to you Martin for making it work.


 on: September 10, 2009, 09:38:51 PM 
Started by Budgie - Last post by Budgie
Tonight I have introduced a new page to the SCWN website.
This new page contains a brief forecast for five areas of Scotland.
The forecast data has kindly been supplied by the owners of Carse of Gowrie, Elgin, Forth and Isle of Skye Weathers, along with my own forecast.

All these sites use the WXSim program to produce a forecast and we were able to incorporate these onto one page using Ken True's Plaintext-parser script.

I hope this new addition is helpful and thanks must go to all involved is getting this page up & running but especially Chris, who came up with the original idea.  Grin


 on: September 10, 2009, 09:21:31 PM 
Started by Tugmistress - Last post by Tugmistress
that's brilliant thank you budgie Cheesy

 on: September 10, 2009, 09:10:25 PM 
Started by Tugmistress - Last post by Budgie

Three screws in the base of the raingauge, unscrew them and the radiation shield with come away.
If you can't get it going after cleaning the gauze cover then there are a couple of tests to do that are in the troubleshooting section of the manual.
If these don't work then contact McMurdo in Portsmouth, explain the issue (including the tests) and they should sent a replacement temp/hum sensor as the one's made pre-2006 have a known problem.  Wink

 on: September 10, 2009, 08:00:16 PM 
Started by Tugmistress - Last post by Tugmistress
ok update on this,
changed the battery and everything seems fine except the temp/humidity sensor
is there a way to get in to it or to check it without wrecking it?

 on: September 10, 2009, 10:14:34 AM 
Started by Budgie - Last post by skyewright
...and it might be that I'd be better trying to refine the 'hardware filter" anyway
The more I look at it the more it looks as though hardware (perhaps plus some extra spike logic) is the best angle of attack. Some sort of electrical interference at a level that hadn't cropped up so obviously before seems the almost certain cause.

Taking a close look at the data the 105 mph gust could have been spotted logically quite easily (a 50mph acceleration between one second and the next!), but just before that there was another well over 90mph that was much more subtle, with each step in the chain quite reasonable in itself.

I'm assuming that the interference is coming in short bursts of highish frequency rather than being sustained low frequency (as low as 20-30 Hz).

IIRC the current low pass filter clips at about 160 Hz in theory (well beyond any real weather), but that assumes no extra resistance or (probably more important) capacitance in the circuit. Without a scope (and ideally a signal generator) it's hard to be certain exactly what it is clipping at and (aside from reporting invalid data) the last thing I want to have is a system that starts clipping real gusts!

If the weekend is dry (as looks possible) I may take wind8 out of the WD equation, then try adjusting the filter so that the theoretical clip is within what is actually happening and see how theory compares to reality. Then I can maybe adjust the filter to values that are tighter.

So what chance a flat calm, eh?  Wink

 on: September 09, 2009, 08:17:58 PM 
Started by Budgie - Last post by Budgie

I'm just about to change the PHP on the server from PHP4 to PHP5.
This shouldn't do anything but in reality it may cause some issues with older scripting on some of the pages.
So if you notice anything wrong the don't worry as I will be sorting it out asap.  Wink


 on: September 09, 2009, 05:39:54 PM 
Started by Budgie - Last post by skyewright
All very strange as you have said, but interesting none the less..
As I have the OS gear there as a fallback, and have code set up so that fallback is automatic (i.e. if wind8 doesn't appear in a given minute, then data from wind1, the WMR200, is automatically fed to WD instead) I hope to come up with a test (probably something erring on conservative) for "better ignore this one". However given how gusty and strong wind can really be here that's not necessarily going to be easy to define!

To some extent it's a matter of deciding what is the maximum "reasonable" acceleration, then combining that with a few other things. I've not come up with a formula yet but I have a ton of those stuff to do too (and it might be that I'd be better trying to refine the 'hardware filter" anyway). Oh, well, must remember 1 Tim 6:8 and keep smiling.  Smiley Worse things happen at sea (and many other places!)...

 on: September 09, 2009, 04:10:16 PM 
Started by Budgie - Last post by munrobaggins
It's a case of being "obviously wrong" to the human eye, but it may be very awkward to define logically (but I'll try).
All very strange.  Sad
The funny thing is that it was all brought to my attention by a pal of mine over here....and he was wondering if it was real?  All very strange as you have said, but interesting none the less..

 on: September 09, 2009, 02:23:36 PM 
Started by Budgie - Last post by skyewright
I would question that one, unless you're in a glen where the wind funnels past or you're on top of Munro.  Wink
Me too. Gone now. Investigating...

I believe that it was just a temporary anomaly and yesterday's data was valid. I also still believe a 77mph gust squall one Saturday evening in late August that isn't reported on the website - I witnessed that one and it was a wild few minutes!

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