"Paul Tomblin" wrote in message
...
When you're determining if you need an alternate, and whether you can use
an airport for an alternate, do you use the minimum of the normal
forecast, TEMPOs and PROBs?


As I read the CANADIAN rules, the answer appears to be "the lowest
forecast", including TEMPO and PROB. The forecast TEMPO or PROB condition
"shall not be below the published alternate minima requirements for that
aerodrome". AIP 3.14

Interesting that USA's Part 91 does not specify that clearly.