[OZAPRS] Weather

[Ray Wells]

Geoff/All,

Thanks Geoff. I seemed to recall something from you a while back about 
the Bom and their methods.

I see the dilemma. Strange, isn't it. The mid north coastal waters north 
of Crowdy Head have no warnings at all but we have a gale warning. It's 
beter to err on the side of caution :-)

Ray vk2tv

Geoff wrote:
>
> Unfortunately it has EVERYTHING to do with the way BoM issue their 
> warnings.
>
>  
>
> If you take a look at the warning in question, it is a “Coastal Waters 
> Wind Warning for NSW waters south of Crowdy Head”
>
> Within that warning there are three Gale warnings and a Strong Wind 
> Warning.  No matter what we have done with the scripts that parse the 
> text so far, we have never been able to reliably pull out the 
> individual warnings accurately, given that it is entirely free-text 
> format.
>
>  
>
> If BoM did things “properly” there would be four separate warnings:
>
> -          Gale Warning For the South Coast, Illawarra Coast From Gabo 
> Island to Port Hacking
>
> -          Gale Warning For the Hunter Coast, Sydney Coast, >From Port 
> Hacking to Broken Bay
>
> -          Gale Warning For Sydney Closed Waters Port Jackson, Botany 
> Bay and Pittwater
>
> -          Strong Wind Warning For the Mid North Coast Seal Rocks to 
> Crowdy Head
>
>  
>
> If BoM decide to implement the nice XML formatting of warnings 
> nationally that they have been trialling very secretively in VK3 (we 
> only found them by mistake the other day) then we would be able to 
> EASILY break a warning into the correct parts – even specifying the 
> exact shapefile segments to light up – but I doubt that will happen 
> for a L-O-N-G time….  L
>
>  
>
> The way the scripts work at present is to assign the HIGHEST level to 
> all the affected areas, which is why you are seeing the Gale warning.
>
>  
>
> Regards,
>
> Geoff
>
>  
>
>  
>
> *From:* ozaprs-bounces at aprs.net.au [mailto:ozaprs-bounces at aprs.net.au] 
> *On Behalf Of *Scott Evans
> *Sent:* Saturday, January 23, 2010 12:02 PM
> *To:* Australian APRS Users
> *Subject:* Re: [OZAPRS] Weather
>
>  
>
> I think it has a lot to do with how the BoM format their warnings and 
> the perl script picking out the relevant bits etc...
>
>
>
> On Sat, 2010-01-23 at 11:09 +1100, Ray Wells wrote:
>
>  
> Hi All,
>  
> I guess this is aimed at Geoff more than anyone else and, it's not a 
> complaint.
>  
> I use xastir and I get maritime weather warnings that do not agree with 
> BoM warnings.
>  
> Earlier this morning I had a wind warning (but no icon). This later 
> change to displaying the MNC_GLE icon. There is currently only a strong 
> wind warning for mid north coastal waters and not a gale warning. The 
> nearest gale warning are for the Illawarra and further south.
>  
> My question for Geoff is, is this due to shortcomings in the way the BoM 
> issue warnings?
>  
> I've just checked the xastir display at the radio station and it is also 
> displaying a gale warning, which tends to rule out a particular 
> installation having an issue.
>  
> Ray vk2tv
>  
> _______________________________________________
> OZAPRS mailing list
> OZAPRS at aprs.net.au <mailto:OZAPRS at aprs.net.au>
> http://lists.aprs.net.au/mailman/listinfo/ozaprs
>
>  
>
>
> --
> *Scott Evans VK7HSE*
> *Phone: +61362291658*
> *Mobile: +61417586157*
> *Skype: vk7hse*
> *scott at vk7hse.hobby-site.org <mailto:scott at vk7hse.hobby-site.org>*
> *http://www.vk7hse.hobby-site.org*
> *PGP/GPG Key ID 437E00F9*
>
>  
>
> ------------------------------------------------------------------------
>
> _______________________________________________
> OZAPRS mailing list
> OZAPRS at aprs.net.au
> http://lists.aprs.net.au/mailman/listinfo/ozaprs
>