I was thinking of taking a JQ flight (JQ17 - A332) northwards between SYD-KIX in the next couple of days. Then I looked at some turbulence information online...
IDV60075 ** BUREAU of METEOROLOGY - Melbourne ** ** AUSTRALIAN SIGMETS ** 11:20 UTC, 14/04/2008 -------------------------------------------------------------------- YBBB SIGMET BS02 VALID 140941/141541 YMMC- YBBB BRISBANE FIR SEV TURB FCST WI S4700 E16300 - S5000 E16300 - S5000 E15800 - S4400 E15500 - S4400 E15800 - FL200/300 MOV E AT 20KT WKN. STS:REVIEW BS01 140341/140941= YMMM SIGMET ME02 VALID 140941/141541 YMMC- YMMM MELBOURNE FIR SEV TURB FCST WI S4700 E16300 - S5000 E16300 - S5000 E15800 - S4400 E15500 - S4400 E15800 - FL200/300 MOV E AT 20KT WKN. STS:REVIEW ME01 140341/140941= YBBB SIGMET BS01 VALID 140341/140941 YMMC- YBBB BRISBANE FIR SEV TURB FCST WI S5000 E16200 - S4400 E15700 - S4400 E15400 - S5000 E15600 - FL185/300 MOV E AT 25KT NC. STS:NEW=
Bureau of Meteorology - Aviation
(Also Jeppensen, under Australia, gives turbulence maps for different flight levels.)
Now, I'm no pilot so I'm not certain how best to interpret this information or what relevance it has to an A332 about 1 - 2 hours into it a long flight (ie, what altitude it would be cruising at).
Would that red moderate-severe turbulence be likely to impact on the flight?
What measures would be taken to avoid it (ie would the airline/pilot plan a significant course or altitude deviation?)
Is this the jetstream, as these images would seem to indicate?
And on another technical issue, which is the best spot to sit in for vertical turbulence (up and down) so that you feel the minimum of movement? Is it the front of the aircraft or the wingbox? I know from experience it's not the rear! I guess this is determined by the axis of rotation for the aircraft. Does it pivot around the centre of gravity (roughly the wings) or the nose? I can understand the latter as lift (upwards force) is generated at the centre of the plane by the wings so when this force decreases (dropping) the wings should, I think, be the first point to drop.
Sorry for all the questions. Each time I think that I have beaten turbulence I get a flight where I sit at the rear of the aircraft and my fear/displeasure returns.