TDK m2
I hope you dont mean me, in the retired or computer nerd category, current airline captain if you must know, so pipe down.
Nobody has answered the question, in 13 hours they did not get a suitable alternate, they just ploughed on with what they planned 13 hours ago and probably planned the alternate with a prob40 tempo. Big mistake 99 times out of 100 they get lucky and it never appears. As somebody said they may disregard prob tempos, to me if it appears on paper whatever the chances, somebody far brighter than me who studied meteorology thinks it may happen, good enough for me, find somewhere else.
JW, completely agree with you
Somebody told me it is better to make a mistake, and then change than make no decision at all, which is what happened here