[OZAPRS] WXSVR-AU - definition of Marine Forecast areas

[Andrew Rich]

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Andrew Rich

On 06/11/2011, at 10:50, Geoff Gatward <geoff at gatwards.org> wrote:

> Folks,
> 
> During testing of the new server I have found a couple of problems that have been introduced by the way we have defined the FWA identifiers.
> The FWA code is used by IGates to determine which messages to gate locally to RF. 
> This currently affects the MARINE warnings, but could potentially flow on to other warning types as well as we transition them over to the new server.
> 
> A bit of background, the three letter FWA code is NOT provided by BoM, we derive that from the warning area issued by BoM from a database lookup.
> For the standard forecast areas it is straight-forward, e.g. Southwest Slopes = SWS, Riverina = RIV etc.  However for the maritime zones, we have previously been allocating them to the adjacent land zone. The problem is with the new shapefiles, some of the marine areas extend past two or sometimes three different land zones, so allocating a single FWA is difficult, for example "Spencer Gulf" in SA adjoins Lower Eyre Peninsula (LEP), Eastern Eyre Peninsula (EEP), Flinders (FLI), Mid North (MDN), and Yorke Peninsula (YKP) - so which zone do we allocate it to?
> 
> My thought is to allocate each Marine zone it's own new FWA. This would be the easiest solution, HOWEVER we still need to ensure that we don't conflict with any codes used in the US by the NWS system, since we need to ensure that they don't inadvertently gate our messages over there and vice-verca.
> 
> Anyone have any thoughts on this before I make the change?
> 
> Regards,
> Geoff 
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