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HPOUND created the topic: Query regarding movement of troughs/fronts
Apol for a very simple question.
This query arises from Q9 in practice test 1 of the Met book revised Oct 2015.
The question relates to expected wind at 10,000ft for a (north-south) flight from YSCB to YMER. At 2200, the trough was expected to be very slightly west of the planned route. At 0500, the trough was expected to be well east of the route. The flight was scheduled for around 0300
In a case such as this, do we anticipate the movement of the trough to determine it's likely position at time of flight?. In this case, this would mean winds west of the trough apply? Seems this would be a more sensible approach than assuming the trough moves instantaneously at 0500.
bobtait replied the topic: Query regarding movement of troughs/fronts
To clear up any confusion with that question, I have changed the Departure time at Wagga to 0500 and the arrival time at YMER to 0750. That puts you well and truly west of the trough. I've never heard of a CASA question that has you passing through the trough en-route.
HPOUND replied the topic: Query regarding movement of troughs/fronts
Setting aside the CASA exam challenges, given the facts in the original (pre-edit) question, is it reasonable to anticipate the position of the trough to determine winds? For practical purposes, I would think so. Given a position at 0200 and then at 0500, seems sensible to plan on the trough being roughly half way between at around 0330.