1.   Mariners should monitor the weather.

2.   Mariners should strictly monitor the weather before leaving port.

3.   Mariners should closely monitor the progress of Iris.

4.   Mariners should monitor the sea conditions before leaving port or while on the coastal waters.

5.   Mariners should monitor the weather before leaving port.

6.   Mariners should monitor the weather before leaving port or if they are on open water.