1 jul: marine weather forecasting

For some days meteorologists have basically been predicting Marine Mayhem for this week. They are referring to the event as a "Bomb Cyclone".

The Bomb sounded a bit hysterical, but it seems accurate as it describes the formation of a drop of more than 15 millibars as an intense Low Pressure System, or Cyclone, forms in less than 24hrs. Bomb is a short version of Bombogenesis, the process described above. The BC forming off the NSW coast will drop 25 points and effect waters from Qld, the whole NSW coast as well as eastern Victoria.
Swell mapping. The system is south moving.

For sailors, that can mean 125kph (60 knot) winds and seas from 7-10m. Gust may exceed this forecast. And for vessels seeking shelter in river ports like  Newcastle, Port Stephens, Forster, Yamba, Ballina and Tweed, there is a risk of flooding. 
My question is whether the average sailors relying on the more basic weather forecasting methods, or indeed their crossing from New Zealand, Lord How's, Fiji and New Caledonia would have adequate warning.  

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