7am OBS, Happy Aloha Friday, Apr. 19th
Partly cloudy but should clear to mostly sunny by afternoon. Light ENE trades filling to moderate 10-20mph. Small Craft Advisory for Maalaea, Alenuihaha Channel and SE Big Island.
Big Picture updated 4/14. Tiny North + NW. Small SSE + SW combo. Tiny East trade swell. Call 596-SURF: 7a, noon, 3pm; plus, the 5p (recap-forecast).
North Shore:
Dropping 9 sec North + Dropping 12 sec NW. ENE trades adding quite a bit of texture and bump.. Sunset 1-2'+; Rocky Pt 1-2'; Pipe 0-2'; Chuns/Jockos 1-2'; Laniakea 1-2'+; Ali'i Beach Park 0-1.5'. Partly cloudy skies.West:
Dropping 9 sec North + Dropping 12 sec NW + Holding 15 sec SW. Surf's clean w/ lite offshores. Makaha is 1-occ. 2' mostly from the SW. A few clouds.Town:
Holding 15 sec SW + Dropping 12 sec SSE. Mostly clean due to light offshore ENE trades. Surfs significantly down from the past few days. Waikiki reefs are 1-occ. 2'; Kaisers-Rockpiles to Ala Moana to Kewalos are 1-2.5'. Partly cloudy skies.Diamond Head:
Holding 15 sec SW + Dropping 12 sec SSE. Typical bumpiness from moderate ENE trades. Surf's 1-2' w/ a few rare 3'. A few clouds.Sandy's:
Holding 15 sec SW + Dropping 12 sec SSE + minor E trade wrap. Surf's textured under light ENE trades. Full Pt/Half Pt are 1-3'. Shorebreak is 1-2'+. Scattered clouds.East Makapu'u:
Holding small North wrap + Holding 8 sec East trade wind swell. A bit mushy but not too bad early. It's 1-2' and focusing middle to right side in the shorebreak. Partly cloudy skies.Winds
10-25mph NE Trade
10-20mph ENE Trade
10-20mph NE Trade
10-25mph ENE Trade
15-25+mph ENE Trade
North
Primary
Dropping 10s NNWHaw: 1-3
Face: 2-5
Secondary
Dropping 12s NWHaw: 0-1.5
Face: 0-2
Poor-fair side-shores
Primary
Dropping 10s NHaw: 1-2
Face: 1-3
Secondary
Rising Afternoon 13s NHaw: 1-2
Face: 1-3
Fair
3' afternoon
Primary
Up & holding 12s NHaw: 2-4
Face: 3-7
Secondary
None NONEHaw: 0
Face: 0
Fair to good
Primary
Dropping 12s NHaw: 2-3+
Face: 3-5+
Secondary
None NONEHaw: 0
Face: 0
Fair to good
Primary
Dropping 12s NHaw: 2-3
Face: 3-5
Secondary
Rising Later 17s WNWHaw: 1-1.5
Face: 1-2
Fair
West
Primary
Dropping 10s NNWHaw: 1-2
Face: 1-3
Secondary
Dropping 15s SWHaw: 1-2 occ +
Face: 1-3 occ +
Poor-fair side-shores
Primary
Dropping 10s NHaw: 0-1.5
Face: 0-2
Secondary
Dropping 14s SWHaw: 1-2
Face: 1-3
Fair
Primary
Up & holding 12s NHaw: 1-2 occ 3
Face: 2-4 occ 5
Secondary
Holding 15s SWHaw: 1-2
Face: 1-3
Fair to good
Primary
Dropping 12s NHaw: 1-2+
Face: 1-3+
Secondary
Holding 15s SWHaw: 1 occ 2
Face: 1-2 occ 3
Fair to good
Primary
Dropping 12s NHaw: 1-2
Face: 1-3
Secondary
Up & holding 17s SWHaw: 1-2
Face: 1-3
Fair
South
Primary
Dropping 15s SWHaw: 1-2 occ 3
Face: 2-4 occ 5
Secondary
Dropping 12s SSEHaw: 1 occ 2
Face: 1-2 occ 3
Good offshores
Primary
Dropping 14s SWHaw: 1-2 occ +
Face: 1-3 occ +
Secondary
Dropping 11s SSEHaw: 0-1.5
Face: 0-2
Good offshores
Primary
Holding 15s SWHaw: 1-2 occ +
Face: 1-3 occ +
Secondary
Dropping 11s SSEHaw: 0-1
Face: 0-1.5
Fair to good
Primary
Holding 15s SWHaw: 1-2
Face: 1-3
Secondary
None NONEHaw: 0
Face: 0
Fair to good
Primary
Up & holding 17s SWHaw: 1-2 occ +
Face: 1-3 occ +
Secondary
Rising 19s SSWHaw: 1-1.5
Face: 1-2
Fair to good
east
Primary
Dropping 9s NHaw: 1-2+
Face: 1-3+
Secondary
Holding 8s ENEHaw: 1-2
Face: 1-3
Choppy
Primary
Dropping 8s ENEHaw: 1-2
Face: 1-3
Secondary
Dropping 8s NHaw: 1-1.5
Face: 1-2
bumpy
Primary
Up & holding 12s NHaw: 1-2
Face: 1-3
Secondary
Rising 6s ENEHaw: 1-1.5
Face: 1-2
Choppy
Primary
Up & holding 6s ENEHaw: 1-2
Face: 1-3
Secondary
Up & holding 12s NHaw: 1-2
Face: 1-3
Choppy
Primary
Holding 6s ENEHaw: 1-2
Face: 1-3
Secondary
Dropping 12s NHaw: 1-2
Face: 1-3
bumpy
Current Swells:
Friday 04/19Primary: Dropping 10s NNW surf @1-3
Secondary: Dropping 15s SW surf @1-2 occ 3
Third: Dropping 9s N surf @1-2+
Marine Warnings:
Friday 04/19SCA from Maui to Big Is as NE trades fill to fresh paces
Sailing Report:
Friday 04/19Good for with ENE winds filling at 10-25mph.
Diving Report:
Friday 04/19North shores: Poor due to moderate surf w/ side-onshore NNE winds. West shores: Fair for most zones due to small surf and light offshore winds. South shores: Fair overall for due to small surf and to light offshore winds. East shores: Fair due to small surf and lite onshore winds.
Oahu
Maui
Kauai
Big Island
Weather
Surf Advisory and Warning CriteriaLocation/shoreline Advisory Warning
North-Facing Shores- 15 Feet faces (8' Local) 25 Feet faces (15' local)
West-Facing Shores - 12 Feet (7' local) 20 Feet (12' local)
West-Facing- Big Is.- 8 Feet (4'+ local) 12 Feet (7' local)
South-Facing Shores- 8 Feet (4'+ local) 15 Feet (8' local)
East-Facing Shores- 8 Feet (4'+ local) 15 Feet (8' local)
Big Picture
INACTIVE.Get the latest on the tropics at www.hurricanes.gov
The Central Pacific Hurricane Center outlook for the 2017 Central Pacific Hurricane Season calls for 5 to 8 tropical cyclones to either develop or cross into the Central Pacific with a 40% chance for an above-normal season, a 40% chance for a normal season, and a 20% chance for a below-normal season. An average season has 4 to 5 tropical cyclones, which include tropical depressions, tropical storms, and hurricanes.
A tropical depression forms when a low-pressure area is accompanied by thunderstorms that produce a circular wind flow with maximum sustained winds below 39 mph. An upgrade to a tropical storm occurs when cyclonic circulation becomes more organized and maximum sustained winds gust between 39 mph and 73 mph. A tropical storm is then upgraded into Category 1 hurricane status as maximum sustained winds increase to between 74 mph and 95 mph. (The highest classification in the scale, Category 5, is reserved for storms with winds exceeding 156 mph).
Tropical cyclones go by many names around the world, and the terminology can get confusing. Once a tropical cyclone strengthens to the point where it has gale-force winds—39 mph or greater—it becomes a tropical storm. A storm that reaches tropical storm strength usually gets its own name to help us quickly identify it in forecasts and warnings. Once a tropical storm begins producing sustained winds of around 75 mph, we call the storm a typhoon in the western Pacific near Asia and a hurricane in the oceans on either side of North America. A “typhoon” and a “hurricane” are the same kind of storm, they just go by different names…it’s only a matter of geography.
NWS criteria for High Surf Advisories & Warnings.
In coordination with civil defense agencies & water safety organizations in Hawai`i, the NWS uses the criteria below for the issuance of High Surf Advisories & Warnings in coordination with civil defense agencies & water safety organizations in Hawai`i.
All surf height observations & forecasts are for the full face surf height, from the trough to the crest of the wave.
Advisory and Warning Criteria Location
Warning North-Facing Shores 15 Feet 25 Feet
West-Facing Shores - Remaining Islands 12 Feet 20 Feet
West-Facing Shores - Big Island 8 Feet 12 Feet
South-Facing Shores 8 Feet 15 Feet
East-Facing Shores 8 Feet 15 Feet
'Travel Time' Buoy 51101 to Waimea Buoy. Distance: 269 nautical miles (~310 miles). Angle: 307 deg
Wave Wave Wave Depth Wave Direction (deg)----------
Period Length Speed Shallow 295, 305, 315, 325, 335, 345, 355
(s) (ft) (nm/h) (ft) Travel Time (hours)----------
10sec. 512. 15. 256. 17.3, 17.7, 17.6, 16.9, 15.7, 14.0, 11.9
12sec. 737. 18. 369. 14.5, 14.8, 14.6, 14.0, 13.0, 11.6, 9.9
14sec. 1003. 21. 502. 12.4, 12.7, 12.5, 12.0, 11.2, 10.0, 8.5
16sec. 1310. 24. 655. 10.8, ,1 1.1, 11.0, 10.5, 9.8, 8.7, 7.4
18sec. 1658. 27. 829. 9.6, 9.8, 9.8, 9.4, 8.7, 7.8, 6.6
20sec. 2047. 30. 1024. 8.7 8.9 8.8 8.4 7.8 7.0 5.9
22sec. 2477. 33. 1239. 7.9 8.1 8.0 7.7 7.1 6.3 5.4
24sec. 2948. 36. 1474. 7.2 7.4 7.3 7.0 6.5 5.8 4.9
Tropical Storms - wind 39-73 mph (34-63 kt)
Category 1 - winds 74-95 mph (64-82 kt)
Category 2 -winds 96-110 mph (83-95 kt)
Category 3 -winds 111-130 mph (96-113 kt)
Category 4 - winds 131-155 mph (114-135 kt)
Category 5 -winds 156 mph and up (135+ kt)
Please visit the Central Pacific Hurricane Center website at www.weather.gov/cphc for the most recent bulletins.
ENSO is a single climate phenomenon, it has three states or phases. The two opposite phases, “El Niño” and “La Niña,” require certain changes in both the ocean and the atmosphere because ENSO is a coupled climate phenomenon. “Neutral” is in the middle of the continuum. The MJO (Madden-Julian Oscillation) is an eastward moving disturbance of clouds, rainfall, winds, and pressure that traverses the planet in the tropics and returns to its initial starting point in 30 to 60 days, on average, unlike ENSO which is stationary. In a nutshell, more active means more surf.
Kelvin wave (A Kelvin wave is a wave in the ocean or atmosphere that balances the Earth's Coriolis force against a topographic boundary such as a coastline, or a waveguide such as the equator. A feature of a Kelvin wave is that it is non-dispersive, i.e., the phase speed of the wave crests is equal to the group speed of the wave energy for all frequencies. This means that it retains its shape as it moves in the alongshore direction over time.)
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