Meteorology ATPL question
Thread Starter
Joined: Oct 2006
Posts: 73
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From: ny
Meteorology ATPL question
Hi, im having a little trouble with this question:
Q: In the southern hemisphere what wind effect would you expect when flying from a high pressure area towards a low pressure area at FL 100?
A) Headwind with no drift
B) Wind from the left
C) Wind from the right
D) Tailwind with no drift
The answer given is C - wind from the right.
Now, unless i'm way off the mark, the key to answering this question is that the wind blows anticlockwise around a high pressure area in SH, and clockwise around a low?
So if youre flying towards a low, and the wind is coming from the right, then you must be approaching the low from the east? (i'm visualising the wind literally blowing like a clock)
If that is the reasoning behind the answer, then should it not specify in which direction youre flying?
If someone can clear this up for me itd be much appreciated!
Q: In the southern hemisphere what wind effect would you expect when flying from a high pressure area towards a low pressure area at FL 100?
A) Headwind with no drift
B) Wind from the left
C) Wind from the right
D) Tailwind with no drift
The answer given is C - wind from the right.
Now, unless i'm way off the mark, the key to answering this question is that the wind blows anticlockwise around a high pressure area in SH, and clockwise around a low?
So if youre flying towards a low, and the wind is coming from the right, then you must be approaching the low from the east? (i'm visualising the wind literally blowing like a clock)
If that is the reasoning behind the answer, then should it not specify in which direction youre flying?
If someone can clear this up for me itd be much appreciated!
Hovering AND talking
Joined: Feb 2003
Posts: 5,711
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From: Propping up bars in the Lands of D H Lawrence and Bishop Bonner
I might be wrong but I think this is Buys Ballots!!
With your back to the wind in the Southern hemisphere, the low pressure is on your right.
Cheers
Whirls
Awaiting my Met failure result!!!
With your back to the wind in the Southern hemisphere, the low pressure is on your right.
Cheers
Whirls
Awaiting my Met failure result!!!
Joined: Jun 2002
Posts: 485
Likes: 6
From: Avon, CT, USA
To solve that problem I drew a high-pressure system and a low-pressure system on a piece of paper along with the aircraft ground track. I set up the pressure patterns as you would find in the Northern Hemisphere. I solved the problem for the north and then reversed my answer for the south.
Joined: Mar 2005
Posts: 129
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From: South of BCN
It doesn't matter which direction you are flying!!!
No matter how you draw it on paper if u draw a line from the centre of the high to the centre of the low the wind will always come in from the right in the southern hemisphere. Draw it in many different positions and you will see that direction has no part in this question. The faster you understand that concept the quicker you will be able to jump these questions and help u focus on the harder ones.
Good Luck!
No matter how you draw it on paper if u draw a line from the centre of the high to the centre of the low the wind will always come in from the right in the southern hemisphere. Draw it in many different positions and you will see that direction has no part in this question. The faster you understand that concept the quicker you will be able to jump these questions and help u focus on the harder ones.
Good Luck!
Thread Starter
Joined: Oct 2006
Posts: 73
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From: ny
heres another one guys:
You are flying over the sea at FL 250 and measure an outside temperature of -50°C. The pressure at sea level is 1023 hPa. What is your approximate true altitude calculated using normal vertical change in temperature with increase in height?
(a) 23230'
(B) 26770
(C)26230
(D) 23770
answer is D....can anyone enlighten me as to how to work out that exact figure?
thanks!
You are flying over the sea at FL 250 and measure an outside temperature of -50°C. The pressure at sea level is 1023 hPa. What is your approximate true altitude calculated using normal vertical change in temperature with increase in height?
(a) 23230'
(B) 26770
(C)26230
(D) 23770
answer is D....can anyone enlighten me as to how to work out that exact figure?
thanks!
Joined: May 2007
Posts: 1
Likes: 0
From: Belgium
FL250 =) 1013 hpa
1013 hpa =) 1023 hpa = +270 ft
Outside temperature at 25270 ft should be -35°C
True Alt= Alt with 1023hpa + 4x (outside t° - Std t°)x alt in thousand ft.
= 25270ft + 4x -50° - (-35°) x 25
= 23770ft
1013 hpa =) 1023 hpa = +270 ft
Outside temperature at 25270 ft should be -35°C
True Alt= Alt with 1023hpa + 4x (outside t° - Std t°)x alt in thousand ft.
= 25270ft + 4x -50° - (-35°) x 25
= 23770ft
