Station List

Station 46084 (LLNR 1028) - CAPE EDGECUMBE - 25NM SSW of Cape Edgecumbe, AK Image indicating link to RSS feed of recent meteorological observations for station 46084

Owned and maintained by National Data Buoy Center
3-meter discus buoy w/ seal cage
SCOOP payload
56.614 N 136.040 W (56°36'51" N 136°2'24" W)

Site elevation: sea level
Air temp height: 3.4 m above site elevation
Anemometer height: 3.8 m above site elevation
Barometer elevation: 2.4 m above mean sea level
Sea temp depth: 2 m below water line
Water depth: 1149 m
Watch circle radius: 1212 yards

Latest NWS Marine Forecast

Important Notice to Mariners

Search And Rescue (SAR) Data

Meteorological Observations from Nearby Stations and Ships Image indicating link to RSS feed of recent meteorological observations near station 46084

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yellow diamond Stations with recent data
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Station 46084

Conditions at 46084 as of
(1:20 pm AKST)
2220 GMT on 12/28/2025:
     

Click on the graph icon in the table below to see a time series plot of the last five days of that observation.

5-day plot - Wind Direction Wind Direction (WDIR): S ( 180 deg true )
5-day plot - Wind Speed Wind Speed (WSPD): 11.7 kts
5-day plot - Wind Gust Wind Gust (GST): 15.5 kts
5-day plot - Wave Height Wave Height (WVHT): 12.8 ft
5-day plot - Dominant Wave Period Dominant Wave Period (DPD): 11 sec
5-day plot - Average Wave Period Average Period (APD): 7.9 sec
5-day plot - Mean Wave Direction Mean Wave Direction (MWD): SW ( 232 deg true )
5-day plot - Atmospheric Pressure Atmospheric Pressure (PRES):29.51 in
5-day plot - Water Temperature Water Temperature (WTMP): 43.0 °F
5-day plot - Wind Speed at 10 Meters Wind Speed at 10 meters (WSPD10M): 13.6 kts
5-day plot - Wind Speed at 20 Meters Wind Speed at 20 meters (WSPD20M): 13.6 kts
5-day plot - Wind Speed, Wind Gust and Atmospheric Pressure Combined plot of Wind Speed, Gust, and Air Pressure
Supplemental Measurements
Lowest 1-minute Pressure
Time (AKST)Pressure
1:20 pm29.51 in
Highest 1-minute Wind Speed
Time (AKST)5-day plot - 1-Minute Wind Speed WSPD 5-day plot - 1-Minute Wind Direction WDIR
1:16 pm 13.6 kts S ( 180 deg true )
Previous observations
TIME
(AKST)		 5-day plot - Wind Direction
WDIR
 		 5-day plot - Wind Speed
WSPD
kts		 5-day plot - Wind Gust
GST
kts		 5-day plot - Wave Height
WVHT
ft		 5-day plot - Dominant Wave Period
DPD
sec		 5-day plot - Average Wave Period
APD
sec		 5-day plot - Mean Wave Direction
MWD
 		 5-day plot - Atmospheric Pressure
PRES
in		 5-day plot - Pressure Tendency
PTDY
in		 5-day plot - Air Temperature
ATMP
°F		 5-day plot - Water Temperature
WTMP
°F		 5-day plot - Dew Point
DEWP
°F		 5-day plot - Salinity
SAL
psu		 5-day plot - Visibility
VIS
nmi		 5-day plot - Tide (above MLLW)
TIDE
ft
2025-12-28 01:10 pm S 13.6 17.5 12.8-7.9 SW29.51-- 43.0----
2025-12-28 01:00 pm S 13.6 17.5----29.51+0.01- 43.0----
2025-12-28 12:50 pm S 13.6 17.5 12.8 117.9WSW29.51-- 43.0----
2025-12-28 12:40 pm S 13.6 15.5 12.8-7.9WSW29.51-- 43.0----
2025-12-28 12:30 pm S 13.6 17.5----29.51-- 43.0----
2025-12-28 12:20 pm S 13.6 17.5 11.5 117.6WSW29.52-- 43.0----
2025-12-28 12:10 pm S 13.6 17.5 11.5-7.6WSW29.52-- 43.0----
2025-12-28 12:00 pm S 13.6 17.5----29.51+0.01- 43.0----
2025-12-28 11:50 am S 15.5 17.5 11.8 117.5WSW29.50-- 43.0----
2025-12-28 11:40 am S 15.5 19.4 11.8-7.5WSW29.51-- 43.0----
2025-12-28 11:30 am S 15.5 19.4----29.50-- 43.0----
2025-12-28 11:20 am S 13.6 17.5 12.5 117.8WSW29.50-- 43.0----
2025-12-28 11:10 am S 13.6 17.5 12.5-7.8WSW29.50-- 43.0----
2025-12-28 11:00 am S 13.6 17.5----29.51+0.00------
2025-12-28 10:50 am S 15.5 17.5 11.5 127.5WSW29.50-- 43.0----
2025-12-28 10:40 am S 13.6 15.5----29.50-- 43.0----
2025-12-28 10:30 am S 13.6 15.5----29.51-- 43.0----
2025-12-28 10:20 am S 13.6 17.5 13.1 117.7WSW29.50-- 43.0----
2025-12-28 10:10 am S 13.6 17.5 13.1-7.7WSW29.51-- 43.0----
2025-12-28 10:00 am S 13.6 17.5----29.50+0.00- 43.0----
2025-12-28 09:50 am S 15.5 19.4 12.1 117.5WSW29.50-- 43.0----
2025-12-28 09:40 am S 15.5 19.4 12.1-7.5WSW29.50-- 43.0----
2025-12-28 09:30 am S 15.5 19.4----29.50-- 43.0----
2025-12-28 09:20 am S 15.5 19.4 11.5 117.4WSW29.50-- 43.0----
2025-12-28 09:10 am S 15.5 19.4 11.5-7.4WSW29.50-- 43.0----
2025-12-28 09:00 am S 13.6 19.4----29.50+0.00- 43.0----
2025-12-28 08:50 am S 15.5 17.5 12.5 117.5 SW29.50-- 43.2----
2025-12-28 08:40 am S 15.5 19.4----29.49-- 43.2----
2025-12-28 08:30 am S 15.5 19.4----29.49-- 43.0----
2025-12-28 08:20 am S 17.5 19.4 12.8 117.5WSW29.50-- 42.8----
2025-12-28 08:10 am S 15.5 19.4 12.8-7.5WSW29.50-- 42.8----
2025-12-28 08:00 am S 17.5 19.4----29.50+0.01- 42.8----
2025-12-28 07:50 am S 15.5 19.4 12.5 117.5WSW29.50-- 42.8----
2025-12-28 07:40 am S 15.5 19.4 12.5-7.5WSW29.50-- 42.8----
2025-12-28 07:30 am S 15.5 21.4----29.50-- 42.8----
2025-12-28 07:20 am S 17.5 21.4 13.1 117.6WSW29.50-- 42.8----
2025-12-28 07:10 am S 17.5 21.4 13.1-7.6WSW29.50-- 42.8----
2025-12-28 07:00 am S 17.5 21.4----29.50+0.02- 42.8----
2025-12-28 06:50 am S 17.5 21.4 12.1 117.4WSW29.49-- 42.8----
2025-12-28 06:40 am S 17.5 19.4----29.49-- 43.0----
2025-12-28 06:30 am S 19.4 23.3----29.49-- 43.0----
2025-12-28 06:20 am S 17.5 23.3 12.8 117.4WSW29.49-- 43.0----
2025-12-28 06:10 am S 17.5 23.3----29.49-- 43.2----
2025-12-28 06:00 am S 17.5 21.4----29.49+0.02- 43.2----
2025-12-28 05:50 am S 19.4 23.3 11.5 127.0WSW29.49-- 43.2----
2025-12-28 05:40 am S 19.4 23.3 11.5-7.0WSW29.49-- 43.2----
2025-12-28 05:30 amSSW 19.4 23.3----29.49-- 43.2----
2025-12-28 05:20 amSSW 19.4 27.2 12.8 127.4WSW29.49-- 43.3----
2025-12-28 05:10 am S 19.4 25.3 12.8-7.4WSW29.49-- 43.3----
2025-12-28 05:00 amSSW 19.4 25.3----29.49+0.02- 43.3----
2025-12-28 04:50 amSSW 21.4 25.3 11.5 116.7WSW29.49-- 43.5----
2025-12-28 04:40 amSSW 19.4 23.3----29.49-- 43.5----
2025-12-28 04:30 amSSW 21.4 25.3----29.49-- 43.5----
2025-12-28 04:20 amSSW 21.4 25.3 13.5 127.7WSW29.48-- 43.7----
2025-12-28 04:10 amSSW 21.4 27.2 13.5-7.7WSW29.48-- 43.7----
2025-12-28 04:00 amSSW 21.4 27.2----29.48+0.02- 43.9----
2025-12-28 03:50 amSSW 23.3 27.2 12.8 117.3 SW29.48-- 43.9----
2025-12-28 03:40 amSSW 21.4 27.2 12.8-7.3 SW29.48-- 43.9----
2025-12-28 03:30 amSSW 21.4 27.2----29.48-- 44.1----
2025-12-28 03:20 amSSW 21.4 29.1 12.1 127.0WSW29.48-- 44.1----
2025-12-28 03:10 amSSW 21.4 27.2----29.48-- 44.1----
2025-12-28 03:00 amSSW 21.4 27.2----29.47+0.02- 44.1----
2025-12-28 02:50 amSSW 21.4 27.2 11.8 116.9WSW29.47-- 44.1----
2025-12-28 02:40 amSSW 21.4 25.3----29.47-- 44.1----
2025-12-28 02:30 amSSW 23.3 27.2----29.47-- 44.1----
2025-12-28 02:20 amSSW 23.3 29.1 13.5 117.4WSW29.47-- 44.1----
2025-12-28 02:10 amSSW 23.3 27.2 13.5-7.4WSW29.47-- 44.1----
2025-12-28 02:00 amSSW 23.3 27.2----29.47+0.02- 44.2----
2025-12-28 01:50 amSSW 21.4 27.2 12.8 107.0 SW29.47-- 44.2----
2025-12-28 01:40 amSSW 19.4 25.3 12.8-7.0 SW29.47-- 44.2----
2025-12-28 01:30 amSSW 21.4 25.3----29.46-- 44.2----
2025-12-28 01:20 amSSW 23.3 27.2 13.1 107.2SSW29.46-- 44.2----
2025-12-28 01:10 amSSW 21.4 25.3 13.1-7.2SSW29.46-- 44.2----
2025-12-28 01:00 amSSW 21.4 27.2----29.46+0.01- 44.2----
2025-12-28 12:50 amSSW 21.4 25.3 12.8 117.1 SW29.46-- 44.2----
2025-12-28 12:40 amSSW 21.4 29.1 12.8-7.1 SW29.45-- 44.1----
2025-12-28 12:30 amSSW 21.4 27.2----29.45-- 44.1----
2025-12-28 12:20 amSSW 21.4 27.2 13.1 117.3WSW29.45-- 44.1----
2025-12-28 12:10 amSSW 21.4 25.3 13.1-7.3WSW29.45-- 44.1----
2025-12-28 12:00 amSSW 21.4 25.3----29.45+0.00- 44.2----
2025-12-27 11:50 pmSSW 21.4 25.3 12.8 107.2WSW29.45-- 44.2----
2025-12-27 11:40 pmSSW 19.4 23.3 12.8-7.2WSW29.45-- 44.2----
2025-12-27 11:30 pmSSW 19.4 25.3----29.44-- 44.2----
2025-12-27 11:20 pmSSW 21.4 27.2 12.5 107.1SSW29.44-- 44.2----
2025-12-27 11:10 pmSSW 21.4 25.3 12.5-7.1SSW29.44-- 44.4----
2025-12-27 11:00 pmSSW 21.4 25.3----29.44+0.00- 44.4----
2025-12-27 10:50 pmSSW 19.4 25.3 14.1 117.6 SW29.44-- 44.4----
2025-12-27 10:40 pmSSW 19.4 23.3----29.44-- 44.6----
2025-12-27 10:30 pmSSW 19.4 27.2----29.44-- 44.6----
2025-12-27 10:20 pmSSW 19.4 23.3 13.5 107.3 SW29.44-- 44.6----
2025-12-27 10:10 pmSSW 19.4 23.3 13.5-7.3 SW29.44-- 44.8----
2025-12-27 10:00 pmSSW 19.4 23.3----29.44+0.00- 44.8----
2025-12-27 09:50 pmSSW 19.4 23.3 13.8 107.2 SW29.44-- 44.8----
2025-12-27 09:40 pmSSW 19.4 23.3----29.44-- 44.8----
2025-12-27 09:30 pmSSW 19.4 23.3----29.45-- 44.8----
2025-12-27 09:20 pm S 19.4 23.3 12.5 107.1 SW29.45-- 44.8----
2025-12-27 09:10 pmSSW 19.4 23.3 12.5-7.1 SW29.45-- 44.8----
2025-12-27 09:00 pmSSW 19.4 23.3----29.45+0.02------
2025-12-27 08:50 pmSSW 19.4 23.3 12.5 97.2 SW29.45-- 44.8----
2025-12-27 08:40 pmSSW 19.4 25.3 12.5-7.2 SW29.45-- 44.8----
2025-12-27 08:30 pmSSW 19.4 23.3----29.45-- 44.8----
2025-12-27 08:20 pmSSW 19.4 23.3 13.1 97.4SSW29.45-- 44.8----
2025-12-27 08:10 pmSSW 17.5 23.3 13.1-7.4SSW29.45-- 44.8----
2025-12-27 08:00 pmSSW 17.5 21.4----29.45+0.00- 44.8----
2025-12-27 07:50 pmSSW 17.5 21.4 12.8 107.3 S29.45-- 44.8----
2025-12-27 07:40 pmSSW 17.5 21.4----29.45-- 44.8----
2025-12-27 07:30 pmSSW 17.5 21.4----29.45-- 44.8----
2025-12-27 07:20 pmSSW 19.4 23.3 13.8 97.5SSW29.45-- 44.8----
2025-12-27 07:10 pmSSW 19.4 23.3 13.8-7.5SSW29.45-- 44.8----
2025-12-27 07:00 pmSSW 19.4 23.3----29.45+0.01- 44.8----
2025-12-27 06:50 pmSSW 19.4 23.3 13.1 97.1 S29.45-- 44.8----
2025-12-27 06:40 pmSSW 17.5 21.4----29.44-- 45.0----
2025-12-27 06:30 pm S 17.5 21.4----29.44-- 44.8----
2025-12-27 06:20 pm S 17.5 21.4 13.5 97.5SSW29.44-- 44.8----
2025-12-27 06:10 pm S 17.5 21.4 13.5-7.5SSW29.44-- 44.8----
2025-12-27 06:00 pm S 17.5 21.4----29.43-0.01- 44.8----
2025-12-27 05:50 pm S 17.5 21.4 13.1 107.3SSE29.44-- 44.8----
2025-12-27 05:40 pm S 17.5 19.4----29.44-- 44.8----
2025-12-27 05:30 pm S 17.5 21.4----29.44-- 44.8----
2025-12-27 05:20 pm S 17.5 21.4 13.5 97.2SSW29.44-- 44.8----
2025-12-27 05:10 pm S 17.5 21.4 13.5-7.2SSW29.44-- 44.8----
2025-12-27 05:00 pm S 17.5 21.4----29.44-0.04- 44.8----
2025-12-27 04:50 pm S 17.5 21.4 14.1 97.3 S29.44-- 44.8----
2025-12-27 04:40 pm S 17.5 21.4----29.44-- 44.8----
2025-12-27 04:30 pm S 17.5 21.4----29.44-- 44.8----
2025-12-27 04:20 pmSSE 17.5 21.4 14.8 97.3 S29.44-- 44.8----
2025-12-27 04:10 pmSSE 17.5 21.4 14.8-7.3 S29.44-- 45.0----
2025-12-27 04:00 pmSSE 17.5 21.4----29.44-0.07- 45.0----
2025-12-27 03:50 pmSSE 19.4 23.3 13.8 97.1 S29.44-- 45.1----
2025-12-27 03:40 pmSSE 19.4 23.3----29.44-- 45.1----
2025-12-27 03:30 pmSSE 19.4 23.3----29.44-- 45.3----
2025-12-27 03:20 pm SE 21.4 25.3 16.1 97.3SSE29.44-- 45.3----
2025-12-27 03:10 pm SE 23.3 31.1 16.1-7.3SSE29.44-- 45.3----
2025-12-27 03:00 pm SE 25.3 31.1----29.44-0.11- 45.3----
2025-12-27 02:50 pm SE 27.2 35.0 16.4 97.4 SE29.44-- 45.3----
2025-12-27 02:40 pm SE 29.1 36.9----29.45-- 45.3----
2025-12-27 02:20 pm SE 33.0 42.7 17.4 107.4 SE29.46-- 45.3----
2025-12-27 02:10 pm SE 33.0 42.7 17.4-7.4 SE29.47-- 45.3----
2025-12-27 02:00 pm SE 35.0 42.7----29.48-0.12- 45.3----
2025-12-27 01:50 pm SE 35.0 44.7 17.1 97.3SSE29.48-- 45.3----
2025-12-27 01:40 pm SE 36.9 46.6 17.1-7.3SSE29.48-- 45.3----
2025-12-27 01:30 pm SE 35.0 42.7----29.48-- 45.3----
2025-12-27 01:20 pm SE 35.0 42.7 17.7 107.5SSE29.49-- 45.3----
2025-12-27 01:10 pm SE 33.0 42.7 17.7-7.5SSE29.50-- 45.3----
2025-12-27 01:00 pm SE 35.0 44.7----29.51-0.14- 45.3----
2025-12-27 12:50 pm SE 33.0 44.7 17.1 97.5SSE29.52-- 45.1----
Wave Summary
for 46084 as of (1:10 pm AKST)
2210 GMT on 12/28/2025:

These wave data are displayed in rounded times.

     

Click on the graph icon in the table below to see a time series plot of the last five days of that observation.

5-day plot - Significant Wave Height Significant Wave Height (WVHT): 12.8 ft
5-day plot - Swell Height Swell Height (SwH): 11.8 ft
5-day plot - Swell Period Swell Period (SwP): 11.4 sec
5-day plot - Swell Direction Swell Direction (SwD): SW
5-day plot - Wind Wave Height Wind Wave Height (WWH): 4.9 ft
5-day plot - Wind Wave Period Wind Wave Period (WWP): 5.0 sec
5-day plot - Wind Wave Direction Wind Wave Direction (WWD):WSW
5-day plot - Wave Steepness Wave Steepness (STEEPNESS): AVERAGE
5-day plot - Average Wave Period Average Wave Period (APD): 7.9 sec
Previous observations
TIME
(AKST)		 5-day plot - Wave Height
WVHT
ft		 5-day plot - Swell Height
SwH
ft		 5-day plot - Swell Period
SwP
sec		 5-day plot - Swell Direction
SwD
 		 5-day plot - Wind Wave Height
WWH
ft		 5-day plot - Wind Wave Period
WWP
sec		 5-day plot - Wind Wave Direction
WWD
 		 5-day plot - Wave Steepness
STEEPNESS
 		 5-day plot - Average Wave Period
APD
sec
2025-12-28 12:40 pm 12.8 11.8 11.4WSW 5.2 5.9 SW AVERAGE 7.9
2025-12-28 12:10 pm 11.5 10.2 11.4WSW 5.2 6.7 SW AVERAGE 7.6
2025-12-28 11:40 am 11.8 9.8 11.4WSW 6.2 6.7 WSW AVERAGE 7.5
2025-12-28 11:10 am 12.5 11.5 11.4WSW 5.2 6.7 SW AVERAGE 7.8
2025-12-28 10:40 am 11.5 10.5 12.1WSW 5.2 5.0 SSW SWELL 7.5
2025-12-28 10:10 am 13.1 12.1 10.8WSW 5.2 6.2 SW AVERAGE 7.7
2025-12-28 09:40 am 12.1 10.5 10.8WSW 5.9 5.9 SW AVERAGE 7.5
2025-12-28 09:10 am 11.5 9.5 10.8WSW 6.9 7.7 WSW AVERAGE 7.4
2025-12-28 08:40 am 12.5 10.8 11.4 SW 6.2 6.2 SW AVERAGE 7.5
2025-12-28 08:10 am 12.8 10.8 10.8WSW 6.9 5.0 SW AVERAGE 7.5
2025-12-28 07:40 am 12.5 10.5 11.4WSW 6.6 5.9 SW AVERAGE 7.5
2025-12-28 07:10 am 13.1 10.8 10.8WSW 7.9 6.2 SW AVERAGE 7.6
2025-12-28 06:40 am 12.1 9.5 11.4WSW 7.9 5.9 SW AVERAGE 7.4
2025-12-28 06:10 am 12.8 10.5 11.4WSW 7.2 4.2 SW AVERAGE 7.4
2025-12-28 05:40 am 11.5 8.5 12.1WSW 7.9 5.9 WSW SWELL 7.0
2025-12-28 05:10 am 12.8 10.5 12.1WSW 7.5 7.7 SW AVERAGE 7.4
2025-12-28 04:40 am 11.5 9.5 11.4WSW 6.6 6.2 SW AVERAGE 6.7
2025-12-28 04:10 am 13.5 10.5 12.1WSW 8.2 8.3 SSW AVERAGE 7.7
2025-12-28 03:40 am 12.8 10.5 11.4 SW 7.2 6.2 SSW AVERAGE 7.3
2025-12-28 03:10 am 12.1 8.9 12.1WSW 8.5 7.1 SW SWELL 7.0
2025-12-28 02:40 am 11.8 8.5 11.4WSW 7.9 7.1 SSW AVERAGE 6.9
2025-12-28 02:10 am 13.5 11.2 11.4WSW 7.2 5.0 SW AVERAGE 7.4
2025-12-28 01:40 am 12.8 9.8 10.0 SW 7.9 7.1 SW AVERAGE 7.0
2025-12-28 01:10 am 13.1 10.8 10.0SSW 7.5 6.7 SW STEEP 7.2
2025-12-28 12:40 am 12.8 10.2 10.8 SW 7.9 7.1 SW AVERAGE 7.1
2025-12-28 12:10 am 13.1 11.2 11.4WSW 7.2 6.7 SSW AVERAGE 7.3
2025-12-27 11:40 pm 12.8 10.5 10.0WSW 7.5 7.7 SSW AVERAGE 7.2
2025-12-27 11:10 pm 12.5 9.5 10.0SSW 8.2 6.7 SSW AVERAGE 7.1
2025-12-27 10:40 pm 14.1 11.5 10.8 SW 8.2 5.9 SW AVERAGE 7.6
2025-12-27 10:10 pm 13.5 10.5 10.0 SW 8.5 5.3 SSW STEEP 7.3
2025-12-27 09:40 pm 13.8 10.5 10.0 SW 8.9 5.6 SSW STEEP 7.2
2025-12-27 09:10 pm 12.5 10.2 10.0 SW 6.9 6.2 SW AVERAGE 7.1
2025-12-27 08:40 pm 12.5 9.5 9.1 SW 8.2 6.2 SSW STEEP 7.2
2025-12-27 08:10 pm 13.1 10.5 9.1SSW 8.2 7.1 SSW STEEP 7.4
2025-12-27 07:40 pm 12.8 9.5 10.0 S 8.2 5.9 SSW AVERAGE 7.3
2025-12-27 07:10 pm 13.8 11.2 9.1SSW 7.9 7.1 SSW STEEP 7.5
2025-12-27 06:40 pm 13.1 10.2 9.1 S 8.2 5.3 S STEEP 7.1
2025-12-27 06:10 pm 13.5 10.8 9.1SSW 7.9 6.7 S STEEP 7.5
2025-12-27 05:40 pm 13.1 10.2 10.0SSE 8.2 7.1 SSE AVERAGE 7.3
2025-12-27 05:10 pm 13.5 9.5 9.1SSW 9.5 5.0 SSE STEEP 7.2
2025-12-27 04:40 pm 14.1 10.2 9.1 S 9.8 5.6 SSE STEEP 7.3
2025-12-27 04:10 pm 14.8 10.5 9.1 S 10.5 7.1 SSE STEEP 7.3
2025-12-27 03:40 pm 13.8 0.0-- 13.8 9.1 S STEEP 7.1
2025-12-27 03:10 pm 16.1 0.0-- 16.1 9.1 SSE STEEP 7.3
2025-12-27 02:40 pm 16.4 0.0-- 16.4 9.1 SE STEEP 7.4
2025-12-27 02:10 pm 17.4 0.0-- 17.4 10.0 SE STEEP 7.4
2025-12-27 01:40 pm 17.1 0.0-- 17.1 9.1 SSE STEEP 7.3
2025-12-27 01:10 pm 17.7 0.0-- 17.7 10.0 SSE STEEP 7.5

Plot icon Plot of wave energy versus frequency (and period)