Yep, ash cloud is the reason why they turned back.
Quote:
VA ADVISORY
DTG: 20151110/1000Z
VAAC: DARWIN
VOLCANO: RINJANI 264030
PSN: S0825 E11628
AREA: INDONESIA
SUMMIT ELEV: 3726M
ADVISORY NR: 2015/84
INFO SOURCE: HIMAWARI-8
AVIATION COLOUR CODE: ORANGE
ERUPTION DETAILS: VA PLUME OBS TO FL140 EXT 130NM S AT
10/0930Z
OBS VA DTG: 10/1000Z
OBS VA CLD: SFC/FL140 S0816 E11628 - S0806 E11551 - S0821
E11518 - S0835 E11505 - S0901 E11458 - S0936 E11513 - S1008
E11509 - S1035 E11526 - S1006 E11543 - S0950 E11621 - S0855
E11637 MOV SW 5KT
FCST VA CLD +6 HR: 10/1600Z SFC/FL140 S0942 E11510 - S0959
E11554 - S0935 E11628 - S0852 E11640 - S0820 E11631 - S0803
E11554 - S0751 E11512 - S0838 E11454 - S0919 E11446
FCST VA CLD +12 HR: 10/2200Z SFC/FL140 S0955 E11610 - S0854
E11640 - S0820 E11631 - S0802 E11600 - S0749 E11508 - S0834
E11448 - S0922 E11446
FCST VA CLD +18 HR: 11/0400Z SFC/FL140 S0955 E11610 - S0854
E11640 - S0820 E11631 - S0802 E11600 - S0749 E11508 - S0834
E11448 - S0922 E11446
RMK: VA CONTINUES TO BE OBSC BY MET CLOUD TO W AND SW OF
VOLCANO. VA TO FAR S EXP TO DISSISPATE. MOVEMENT DERIVED
FROM LATEST RGB SAT IMAGERY & MODEL WINDS. LIGHT WINDS,
MODEL FORECAST VARIABILITY AND MET CLOUD CONTINUE TO GIVE
LOW CONFIDENCE IN FORECAST.
NXT ADVISORY: NO LATER THAN 20151110/1300Z
http://www.bom.gov.au/aviation/warnings/volcanic-ash/#7
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