Malibu (Surfrider) Alert Guide

California, USA · part of the Malibu (Surfrider) spot guide

The Topanga nearshore buoy (46268) sits about nine kilometres east, inside the same island shadow as Malibu, so its measured height represents what actually reaches the point better than open-ocean model swell — which makes a live-observation alert the right call. Because the islands strip so much size, the height threshold below is deliberately low.

The forecaster's checklist

1. 1.Find the south source — Southern Hemisphere groundswell at 14 to 20 seconds from about 180–210° in our summer, and eastern Pacific tropical systems off Baja in late summer and fall.
2. 2.Apply the island shadow: does the direction clear Catalina and the Channel Islands? It needs a west-southwest component and plenty of open-ocean juice to arrive with size, and it will be markedly smaller than the exposed coast.
3. 3.Read the deep Santa Monica Bay buoy for true offshore direction and period, then the Topanga nearshore buoy (46268) as the representative observed height after the islands filter it.
4. 4.Demand period and direction over raw height — a modest reading at 14 to 18 seconds from the south beats a bigger short-period one.
5. 5.Time tide and wind together: a morning north-to-northwest offshore glass on a medium tide, and defer after rain for the lagoon-mouth water quality.

Local winds & tide

Best wind: N–NW offshore (morning glass; onshore sea-breeze builds by afternoon) — from 320° to 30° (NW–NNE).

Malibu is notably tide-sensitive: a medium tide is the reliable all-rounder, a higher or incoming tide softens and slows it (forgiving and longboard-friendly), and a lower tide over the cobbles steepens and speeds the wall.

Dial it in