NEW ZEALAND (NZZC):
NZZC SIGMET 3 VALID 110613/111213 NZKL-
NZZC NEW ZEALAND FIR VA ERUPTION MT CORDON CAULLE PSN S4031 W07212
VA CLD OBS AT 0600Z FL200/350 S4430 E16700 - S4600 E17100 - S4815
E16815 - S4600 E16515 MOV ENE 30KT FCST 1200Z VA CLD APRX S4145
E17130 - S4330 E17415 - S4815 E16815 - S4600 E16515=
It will affect flights if the lower level drops to FL100 as some flights across the South Island will have to be rerouted or canned.
Current forecast for 1200Z is as follows between FL200 - FL350
Great Circle Mapper