MST IIA Alternative Storm Mooring allows which conditions?

• A. Up to 50 kt wind with 1.5 kt broadside current or less OR up to 64 kt wind with 1 kt broadside current or less
• B. Up to 50 kt wind with 2 kt current
• C. Up to 34 kt wind with 1 kt current
• D. Up to 64 kt wind with 3 kt current

Answer: (A)

Alternative Storm Mooring is allowed only within specific wind and current combinations, because mooring loads come from both wind on the vessel and current pushing sideways, which together determine line tensions. The approved conditions are two clear families: wind up to 50 knots with a broadside current of 1.5 knots or less, or wind up to 64 knots with a broadside current of 1 knot or less. The higher wind option requires a much lighter current to keep forces within safe limits, while the lower wind option allows a bit more current. Scenarios outside these thresholds—such as 50 kt wind with 2 kt current, or 64 kt wind with 3 kt current—would exceed the safe loading for the Alternative Storm Mooring. A case like 34 kt wind with 1 kt current fits within the general intent, but the official allowances are defined by the two specific condition sets above.