These days, if you telephone briefing you will wait endlessly for an operator to respond, you will be read what you ask for and only what you ask for and on the end of a phone in the bush you probably won't even understand your options unless very experienced.
If you look on the bottom of an area forecast or in the ERSA, you will find a phone number which will give you a direct connection to an Aviation Meteorologist, who will answer the 'phone any time of the day or night and be more than happy to provide a 'technical elaboration' and discuss the vagaries of any forecast. They won't of course tell you to go or not go.