Pasha Bulker 243 - Independent investigation into the grounding of ...
Pasha Bulker 243 - Independent investigation into the grounding of ...
Pasha Bulker 243 - Independent investigation into the grounding of ...
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Wind warnings<br />
The Australian Bureau <strong>of</strong> Meteorology (BoM) website provides <strong>the</strong> following<br />
information:<br />
Definitions <strong>of</strong> wind strength used in coastal and high seas warnings<br />
• Strong Wind Warning (Coastal Waters only): from 26 knots and up to 33 knots<br />
• Gale Warning: from 34 knots and up to 47 knots<br />
• Storm Force Wind Warning: from 48 knots and up to 63 knots<br />
• Hurricane Force Wind Warning: 64 knots or more<br />
Note: These wind speeds are 10-minute averages<br />
Coastal waters wind warnings attempt to provide an initial warning about 24 hours<br />
in advance (sometimes 32 hours) and are normally renewed every six hours. All<br />
BoM wea<strong>the</strong>r reports are prefixed with <strong>the</strong> following note:<br />
Please be aware:<br />
Wind gusts may be a fur<strong>the</strong>r 40 per cent stronger than <strong>the</strong> average given here, and<br />
maximum waves may be up to twice <strong>the</strong> height.<br />
Sea and swell<br />
Information provided on <strong>the</strong> BoM website is reproduced in <strong>the</strong> tables below.<br />
Table 3:<br />
Sea condition (in open sea)<br />
Description Height Effect<br />
(metres)<br />
Calm (glassy) 0 No waves breaking on beach<br />
Calm (rippled) 0 - 0.1 No waves breaking on beach<br />
Smooth 0.1 - 0.5 Slight waves breaking on beach<br />
Slight 0.5 - 1.25 Waves rock buoys and small craft<br />
Moderate 1.25 - 2.5 Sea becoming furrowed<br />
Rough 2.5 - 4 Sea deeply furrowed<br />
Very rough 4-6 Sea much disturbed with rollers having steep fronts<br />
High 6-9 Sea much disturbed with rollers having steep fronts<br />
(damage to foreshore)<br />
Very High 9-14 Towering seas<br />
Phenomenal Over 14 Precipitous seas (experienced only in cyclones)<br />
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