bhill
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Approach and inclement weather

Mon Jan 08, 2018 3:12 pm

Good Day All, I am curious about approaches during inclement weather. I live about 20 miles north from KSEA, and it seems that during times of inclement weather, rain, clouds.. that aircraft are at a MUCH lower altitude while on approach. Why is this? One would think that you would want to be above the rain, etc as long as possible, and to have more altitude to work with if something did happen...gusts, shear, etc.
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Starlionblue
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Re: Approach and inclement weather

Mon Jan 08, 2018 3:45 pm

Have you checked Flightradar24? With clouds and such sound carries differently so it might just be the impression you get.

An approach is an approach. Apart from cold weather corrections, the altitudes don't change due to weather.
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26point2
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Re: Approach and inclement weather

Mon Jan 08, 2018 9:42 pm

Check the wind direction. Inclement weather brings wind from the south and, evidently, an approach over your house.
 
FlyHossD
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Re: Approach and inclement weather

Mon Jan 08, 2018 11:18 pm

[photoid][/photoid]
bhill wrote:
Good Day All, I am curious about approaches during inclement weather. I live about 20 miles north from KSEA, and it seems that during times of inclement weather, rain, clouds.. that aircraft are at a MUCH lower altitude while on approach. Why is this? One would think that you would want to be above the rain, etc as long as possible, and to have more altitude to work with if something did happen...gusts, shear, etc.


In the course of a normal weather - i.e., good weather - approach, the aircraft fly the same glideslope as during poor weather. In fact, not dipping below the glideslope is required by the FARs.
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atcdan
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Re: Approach and inclement weather

Tue Jan 09, 2018 6:36 am

In many cases when conducting a visual approach on a clear day, aircraft will be turned onto final 15-20 miles out and already on the glideslope sometimes even above it. During IMC aircraft will be vectored to intercept the glideslope from below, and when simultaneous parallel approaches are in use, one runway is turned onto final at 2000, the other at 3000. This is done to ensure separation in the event one or both aircraft overshoots the final, where as on a clear day they can be visually separated from one another.

Very basic explanation, but the aircraft are flying a longer, lower final in IMC than in VMC.
 
bhill
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Re: Approach and inclement weather

Tue Jan 09, 2018 4:13 pm

atcdan wrote:
In many cases when conducting a visual approach on a clear day, aircraft will be turned onto final 15-20 miles out and already on the glideslope sometimes even above it. During IMC aircraft will be vectored to intercept the glideslope from below, and when simultaneous parallel approaches are in use, one runway is turned onto final at 2000, the other at 3000. This is done to ensure separation in the event one or both aircraft overshoots the final, where as on a clear day they can be visually separated from one another.

Very basic explanation, but the aircraft are flying a longer, lower final in IMC than in VMC.


This may be it...it seems that the usual "turn" over Seattle/Lake Union, the approach is "extended", and the turn is done farther out...

just an observation...
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