Southern Sri Lanka coastal current shifts: April inter-monsoon navigation between Galle and Hambantota?
How do ocean surface currents reverse direction off Dondra Point during the transition from the northeast to southwest monsoon, and what leeway drift adjustments are required?
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3 Answers from travellers
During the April inter-monsoon, the North Indian Ocean surface circulation undergoes a major reversal. The westward North Equatorial Current weakens and is replaced by the eastward-flowing Southwest Monsoon Current. Off Dondra Head, where the continental shelf narrows to under 3 miles, current velocities accelerate up to 3.5 knots setting east-southeast. Vessels navigating east toward Hambantota gain speed over ground, but westbound vessels face heavy head-currents and steep opposing chop, requiring skippers to compensate with 10 to 15 degrees of leeway heading adjustments.
Tidal rip lines form 4 miles offshore where ocean currents meet shallow shelf waters; small sailing craft should avoid crossing these choppy water seams at night.
Keep electronic charts updated with local notices to mariners; drifting multi-day fishing longlines with orange flag buoys can extend across 5 nautical miles.
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