I'm traveling soon to Sydney, Jervis Bay and Brisbane from Seattle. Sounds like your weather has been a challenge lately. What weather forecasting sites do you find useful for predicting if the coming night will be worthy of setting up the scope?
Weatherzone+ is the most accurate I have found for my Android phone. I don't generally use them on my PC.
I ran 3 popular ones at the same time in Tasmania and Melbourne and found Weatherzone the best. http://www.weatherzone.com.au/