I would say:
1. Keep checking
a.
http://www.hko.gov.hk/contente.htm for the weather but I heard it'll just be heavy rain and wind. Signal #3 shouldn't be issued. But who knows?
b. (or calling) the airlines for the status of your girlfriend's flight
2. Tell your girlfriend to call you ONCE she leaves the airplane. There used to be FREE telephones near the gate. Are they still there?
3. Once you get the phone call, run to the Airport Express and take the first train. Or take the overnight bus as someone else suggested.
4. Go to Dim Sum with your girlfriend at the airport. Listen to her traveling stories.
Have fun!
