Atsani Generated Swell Builds Today

Alerts

A Flood Watch remains in effect until 6 p.m. Wednesday for all islands. An unstable and very moist air mass on the back side of the tropical system is lingering across the state. This moisture interacting with the land is expected to produce periods  of heavy rain and slow-moving downpours that could lead to flash flooding. If that occurs a more urgent Flood Advisory (flooding is imminent) or Flood Warning (flooding is occurring) will be posted by the National Weather Service.

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

Big Island Surf Forecast

Hilo side: Wave heights are expected to be knee/waist/chest high today. The best breaks open to the swell could get a bit bigger on the sets.

Kona side: Wave heights waist/chest high are expected for the best breaks open to the west blend swell. Could get up to shoulder/head high on the sets. Knee/thigh high waves for spots that are catching the southerly swell.

South: Wave heights are expected to be knee/waist high today for the best exposures open to the south swell. Spots open to the west will show in the waist/chest high range.

Our current blend of southerly swells is fading Wednesday. Thursday into the weekend we expect some fun surf to build into the waist/chest high range.

Kilo and Loke generated swell is expected to be fun size out of the west at about waist high through Thursday. Atsani has gone extratropical and we are expecting a west-northwest swell from Atsani to build Wednesday/Thursday and peak Friday.

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 / NWS

Image: NOAA / NWS

Image: NOAA / NWS

Image: NOAA / NWS

Image: NOAA / NWS

Image: NOAA / NWS