With regard to the PROBs:
MANUAL OF METEOROLOGY PART 2 (ISBN 0 644 09903 8) from BOM states, on pg 118, that PROB is defined as "condition whose occurrence is doubtful or uncertain (50 per cent or less)".... So I guess by exclusion, anything else in the aerodrome forecast is only has 50% or greater likelihood of occurring.
Last edited by bdcer; 19th Jun 2013 at 06:50.