"Jon O Rourke" wrote here on 24 Feb 2004:

snip
PROB40 means the probability of occurance is 40%, PROB30 - 30%,
there are no other PROBs in use.

Jon.

Thanks. Actually, I was going to put a straight 40%, but this page:

http://www.crh.noaa.gov/lot/aviation/tafcode.html

says: "The PROB40 group is used when the occurrence of thunderstorms or
precipitation is in the 30% to less than 50% range" - and so I changed
my own translation to 30-50%.

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