Jepp ATC page AU-303
3.1.3
No TAF available, so you have to plan for an alternate that does have a firm forecast.
Further, re the navaids AU-304
because no TAF available, 3.3.2 a) is not available to you and therefore alternate again required. The wording is vague but does require vis and cloud forecast at the destination aeordrome which to me an area forecast would not cut it.
i.e. If a TAF was available, no alternate is required by day if you can get relief under 3.3.2 a)
Thats my answer anyway. I'm sure someone will be along shortly with something different.