ZCZC PL06 201702 UTC SEP 26 WAVE HEIGHT WARNING 300CM TSS TERSCHELLING - GERMAN BIGHT ISSUED AT 201700 UTC SEP CONTAINER VESSELS WITH A LENGTH OF 100-200M ARE AT RISK OF LOSING CONTAINERS DURING HEAVY SEA CONDITIONS IN PARTICULAR FROM A WEST-NORTHWEST TO NORTHERLY DIRECTION. THESE VESSELS SHOULD ALTER COURSE IF NECESSARY TO AVOID COMING ABEAM TO THE WAVES AND TAKE OTHER APPROPRIATE MEASURES TO AVOID LOSING CONTAINERS. NNNN