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Advisory Extended Again, Today’s Surf Forecast

December 21, 2017, 1:35 AM HST
* Updated December 20, 8:37 PM
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Image: James Grenz

Marine Alerts (as of 1:00 a.m.)

High Surf Advisory: North and east facing shores of the Big Island through 6 p.m. Thursday.

Small Craft Advisory: For seas of 8 to 12 feet and winds up to 20 knots. Posted through 6 p.m. Thursday.

Check our breaking news section for any weather alerts or updates that may have popped up since this forecast was posted. 

**Click directly on the images below to make them larger. Charts include: Big Island projected winds, tides, swell direction & period and expected wave heights.**

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Big Island Surf Forecast

Hilo: Wave heights are expected to be head high to a few feet overhead today.

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Kona: Wave heights are expected to be knee/thigh high today. The best breaks could get tummy/chest high on the sets. Some spots will see wrap out of the northwest as well, possibly up to chest/head high or more.

South: Wave heights are expected to be knee/thigh high today. The best breaks could get waist high on the sets.

Surf is forecast to stay elevated for north shores through Thursday before slowly fading out on Friday.

Another, larger, northwest swell forecast for the weekend. North and west shores could get up to advisory levels starting late Saturday through Sunday. Will continue to watch the models because the forecast guidance has changed some since yesterday backing off from the original forecast.

Advisories for the surf will likely be extended through the weekend as our series of swells fill in one after another.

Looking at the longer range, another large northwest swell is forecast to fill in late Tuesday bringing elevated surf to north and west shores which could possibly climb up to warning levels. Will also keep an eye on this developing situation.

Keep in mind, surf heights are measured on the face of the wave from trough to crest. Heights vary from beach to beach, and at the same beach, from break to break.  

**Click here for your detailed Big Island weather report.**

Image; NOAA

Image; NOAA

Image; NOAA

Image; NOAA

Image; NOAA

Image; NOAA

Image; NOAA

Image: NOAA

Image: NOAA

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