Weather/fltpln updates are the sole preserve of the operating crew, it is part of the OPERATIONAL CONTROL responsibility of the PIC.
Lets not fall into the trap many airline crews fall into and confuse the difference between OPERATIONS CONTROL and OPERATIONAL CONTROL.
The airline provides OPERATIONS Control, ie it says where and when its aircraft are to fly ie the timetable or preferred diversion ports etc. The PIC does so by exercising OPERATIONAL Control and doing so in a safe and compliant manner. If they can't, then they must refer to Operations Control to establish the companies preferred option.
Operations Control looks at the big picture (the whole airline) problems and solutions.
The PIC's Operational Control is only concerned with the operations of their individual aircraft.
Lets not add further to the confusion by thinking the flight following / flight dispatch system as used in Europe and the US of A is used in Australia, 'cos it's not.
Disco Stu