Alternate minimuns and "TEMPO" in the forecast

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?

--
Paul Tomblin http://xcski.com/blogs/pt/
Unix is great. The Unix culture is magnificent. Life in a Unix without
the GNU utilities is the kind of hell I'd not wish on my worst enemy.
-- Robert Uhl

"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.

The TEMPO and PROB are part of the forecast, nothing normal or abnormal
about it. I don't see how you can exclude them for determining
alternate.


"Icebound" wrote in
:


"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.