WOAA47 NZKL 170623 ICE ACCRETION WARNING 304 THIS AFFECTS OCEAN AREA: SOUTHERN AT 170600UTC OVER WATERS EAST OF WESTERN BOUNDARY AND NORTH OF ICE EDGE. IN AN AREA BOUNDED BY 64S 160E 68S 177E 72S 179E 68S 160E 64S 160E: HEAVY ICE ACCRETION DEVELOPING NEXT 6-12 HOURS. ICE ACCRETION AREA THEN SLOW MOVING. THIS WARNING CANCELS AND REPLACES WARNING 297.