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Stormy Petrel

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Data sources

NWPS — nearshore wave model
WAVEWATCH III — spectral swell
HRRR — 3 km wind
NDBC — realtime buoys
CO-OPS — tide predictions

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Forecasts refresh every 6 h · buoys hourly

California

Half Moon Bay Jetty

jettytide: mid

1.5Updated 0 min ago

Face

2.6ft

12s period

Swell

W

274°

Windonshore

5 mph

SSW

Tide

2.8 ft

slack

ConditionsChoppy

Choppy

42% wind sea

Swell breakdown

WAVEWATCH III

Wind sea

WNW

5.0ft

7s

not surfable

not surfable

P1 (primary)

W

2.8ft

12s

76%

P2 (secondary)

Swell components (ft) · next 48h

Spot info

Breakjetty

Tide preferencemid

Crowdmoderate

Hazardsrocks, sharks, current, jetty, cold water

Optimal conditions

SwellSW 225°

WindNE offshore

Tidemid

Period10s+

Breakjetty

Nearest buoy

BuoyNDBC 46012

Hs6.6 ft

Tp8s

7-day forecast

Time

Rating

Face

Period

Swell

Wind

Tide

Thu, May 14

2am

3.8

7s

WNW291°

5mphcross-on

1.5ft↓

5am

3.7

7s

WNW288°

5mphcross-on

-0.3ft↑

8am

3.7

8s

WNW288°

3mphonshore

2.3ft↑

11am

3.6

8s

WNW288°

6mphcross-on

4.2ft↓

2pm

3.5

8s

WNW289°

10mphcross

2.4ft↓

5pm

2.6

10s

W277°

10mphcross

1.8ft↑

8pm

4.8

9s

WNW291°

9mphcross-on

4.7ft↑

11pm

2.0

16s

SSW211°

6mphonshore

5.9ft

Fri, May 15

2am

2.0

15s

SSW211°

6mphonshore

2.2ft↓

5am

5.5

9s

WNW292°

4mphonshore

-1.0ft↑

8am

5.1

9s

WNW292°

4mphcross

1.0ft↑

11am

4.8

9s

WNW292°

10mphcross

4.1ft↓

2pm

2.0

15s

SSW209°

12mphcross

3.3ft↓

5pm

2.0

14s

SSW209°

12mphcross

1.9ft↑

8pm

2.0

14s

SSW209°

28mphcross

4.2ft↑

11pm

2.1

14s

SSW209°

28mphcross

6.4ft

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Report incorrect data

SSW

1.4ft

14s

19%

P3 (tertiary)

SW

0.7ft

18s

5%

Wind speed (mph) · next 48h

Tide (ft) · next 48h

Dir

—

Water55°F

Reading5/14/2026, 4:00:00 AM

View NDBC station page →