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Planning our next multi-day passage (Feb 2025)
7 de marzo de 2025 · 12 min · 487 vistas
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Mark and David from SV Riff Raff conduct a pre-departure weather briefing for a 400-nautical-mile passage from La Paz, Baja California Sur, to La Cruz de Guanacaste on the Pacific mainland, planned for late February 2025.0:20 Using PredictWind — specifically the PWE and ECMWF models — they compare model correlation to build forecast confidence and step through each leg in sequence.2:37 Leg one runs La Paz to Los Muertos Anchorage via the Serralvo Canal: light winds, wave height under one meter, roll index below three degrees, vertical acceleration under 0.12 G, and a 0.2–0.25-knot favorable current push.3:43 Leg two, Los Muertos to Isla Isabel, runs roughly 12 hours at an average 4.9 knots, with winds tapering to near-calm mid-passage and a wave period stretching to 12 seconds — meaning significant motoring.9:12 The final leg, Isla Isabel to La Cruz, covers 85–90 miles in about 17.5 hours, with a one-hour time-zone change factored in; they delay departure from Isabel by seven hours to a 1400 start, targeting a Saturday morning arrival in daylight.11:18 PredictWind Pro's roll index, vertical acceleration, and slamming index features drive the comfort and safety assessment throughout.4:24 Timing each leg around daylight arrivals and anchoring windows shapes every departure decision.11:09
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