Fronts & Pressure Systems
5 questions · 0 multiple choice · 5 written · Reading synoptic charts — lows, highs, fronts, and Buys Ballot.
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Q1
In the Northern Hemisphere, describe the surface wind flow around a low-pressure system and explain why it differs from the geostrophic flow above the friction layer.
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Q2
A ship in the N hemisphere notes pressure falling at 4 mb per 3 hours and the wind backing from SE through E to NE. Where is the low likely to be tracking relative to the ship, and what should the captain prepare for?
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Q3
What is the standard isobar contour interval on NOAA OPC surface analyses, and what does crowded isobar spacing physically mean for the mariner?
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Q4
What are the four standard front types depicted on a surface analysis, and what are the symbols and colours used for each?
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Q5
What is 'rapid cyclogenesis' (a 'bomb' in marine weather terminology), and what pressure-change threshold defines it?