6.
A vessel immediately north of the Southern Peninsula is interpreting the analysis charts for the 7th August:
a) What would they expect to happen to their observed pressure throughout the day? b) The vessel observes their barometer drop from 1019 at 0400 DST to 1016 at 0730 DST. i) Is this change as expected? ii) What does this suggest? iii) What features could they expect to see in the next four hours? 1) Clouds (list types) 2) Precipitation (yes/no) 3) Temperature (change) 4) Wind (direction and strength)
7. Look at the synoptic chart for the 7th August?
a) What would you expect the predominant wind direction in the Bridge sea area to be? b) What would be the approximate wind strength?
8.
You are navigating in the vicinity of the small bay shown on the chartlet below, in a vessel with a draught of 1.6m. The bay was last surveyed in 1908, and there is insignificant tidal movement in this area. Standard pressure is 1013mb.
a) What is the minimum depth you would expect to encounter when entering the harbour? Would this provide clearance below your keel? b) The wind direction shown has been consistent for the preceding 10 days, with speeds ranging from 12-30kts, and on the day in question is consistently 25kts. What effect would you expect this to have on the depth of water? c) Your barometer shows a pressure of 1026mb. Based on a standard pressure of 1013mb, what difference could this make to the depth of water? d) With the combination of wind direction and strength, and barometric pressure, would you consider this harbour suitable for entry by your vessel?
9.
A vessel appraising a passage from Victoria to Stubbington Bay on the 7th August has access to the shipping forecast, and the inshore waters forecast.
a) Do the two forecasts show the same wind speed? b) Which forecast is more relevant for the intended passage? Explain your answer. c) Which forecast should the skipper use when proceeding to plan and execute the passage?
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