Station List

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Station 44025 (LLNR 830) - LONG ISLAND - 30 NM South of Islip, NY Image indicating link to RSS feed of recent meteorological observations for station 44025

Owned and maintained by National Data Buoy Center
3-meter foam buoy
SCOOP payload
40.258 N 73.175 W (40°15'30" N 73°10'29" W)

Site elevation: sea level
Air temp height: 3.7 m above site elevation
Anemometer height: 4.1 m above site elevation
Barometer elevation: 2.7 m above mean sea level
Sea temp depth: 1.5 m below water line
Water depth: 40.2 m
Watch circle radius: 83 yards

Right whales are active off NY from November to April. Speed restrictions of 10 knots apply to vessels 65 feet or greater in specific areas along the mid-Atlantic coast. To learn more about right whales and rules protecting them, go to: http://www.nmfs.noaa.gov/pr/shipstrike

Latest NWS Marine Forecast 1 and Latest NWS Marine Forecast 2

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 44025

Regional HF Radar Surface Current Observations

Large icon indicates selected station.
yellow diamond Stations with recent data
red diamond Stations with no data in last 8 hours
(24 hours for tsunami stations)
Station 44025

Conditions at 44025 as of
2050 GMT on 03/25/2025:
     

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 ( 190 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): 5.2 ft
5-day plot - Dominant Wave Period Dominant Wave Period (DPD): 8 sec
5-day plot - Average Wave Period Average Period (APD): 6.0 sec
5-day plot - Mean Wave Direction Mean Wave Direction (MWD):SSE ( 155 deg true )
5-day plot - Atmospheric Pressure Atmospheric Pressure (PRES):29.87 in
5-day plot - Air Temperature Air Temperature (ATMP): 45.1 °F
5-day plot - Dew Point Dew Point (DEWP): 39.6 °F
5-day plot - Wind Chill Wind Chill (CHILL): 38.8 °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
Highest 1-minute Wind Speed
Time (GMT)5-day plot - 1-Minute Wind Speed WSPD 5-day plot - 1-Minute Wind Direction WDIR
2049 13.6 kts-
Previous observations
TIME
(GMT)		 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
2025-03-25 2040 S 11.7 15.5 5.2-6.0SSE29.87- 45.0- 39.6---
2025-03-25 2030 S 11.7 15.5----29.87- 44.8- 39.9---
2025-03-25 2020 S 11.7 15.5 5.6-6.3SSE29.87-------
2025-03-25 2010 S 11.7 15.5 5.6-6.3SSE29.87- 44.8- 39.9---
2025-03-25 2000 S 11.7 13.6----29.87-0.04 44.8- 39.9---
2025-03-25 1950 S 11.7 15.5 5.2 96.2SSE29.87- 45.0- 39.2---
2025-03-25 1940 S 11.7 15.5 5.2-6.2SSE29.87- 45.1- 39.0---
2025-03-25 1930SSW 11.7 15.5----29.87- 45.5- 38.7---
2025-03-25 1920SSW 11.7 13.6 5.2 86.3SSE29.87- 45.1- 39.0---
2025-03-25 1910SSW 11.7 15.5 5.2-6.3SSE29.87- 45.1- 39.2---
2025-03-25 1900 S 11.7 13.6----29.87-0.05 45.0- 39.4---
2025-03-25 1850SSW 11.7 13.6 5.2 86.4SSE29.87- 45.0- 38.7---
2025-03-25 1840SSW 11.7 15.5 5.2-6.4SSE29.88- 45.0- 38.8---
2025-03-25 1830SSW 11.7 13.6----29.88- 44.8- 39.4---
2025-03-25 1820SSW 11.7 13.6 5.2 86.4SSE29.88- 44.8- 39.2---
2025-03-25 1810SSW 11.7 13.6 5.2-6.4SSE29.88- 44.8- 38.7---
2025-03-25 1800SSW 11.7 13.6----29.88-0.05 44.6- 39.2---
2025-03-25 1750SSW 9.7 13.6 4.9-6.2SSE29.89-------
2025-03-25 1740SSW 11.7 13.6----29.90- 44.8- 38.8---
2025-03-25 1730SSW 11.7 15.5----29.90- 44.8- 39.2---
2025-03-25 1720SSW 11.7 15.5 5.2 96.4SSE29.91- 44.4- 39.6---
2025-03-25 1710SSW 11.7 13.6 5.2-6.4SSE29.91- 44.1- 39.9---
2025-03-25 1700SSW 9.7 13.6----29.91-0.03 44.1- 39.9---
2025-03-25 1650SSW 9.7 11.7 4.9 86.5 S29.91- 44.1- 39.6---
2025-03-25 1640SSW 9.7 11.7 4.9-6.5 S29.91- 44.1- 39.7---
2025-03-25 1630SSW 9.7 11.7----29.92- 43.9- 39.9---
2025-03-25 1620SSW 9.7 11.7 5.9 86.8SSE29.92- 43.7- 39.7---
2025-03-25 1610SSW 9.7 11.7 5.9-6.8SSE29.92- 43.7- 39.7---
2025-03-25 1600SSW 9.7 11.7----29.93-0.01 43.5- 39.7---
2025-03-25 1550SSW 9.7 11.7 5.2 96.5SSE29.93- 43.5- 39.7---
2025-03-25 1540SSW 9.7 11.7 5.2-6.5SSE29.93- 43.5- 39.4---
2025-03-25 1530SSW 9.7 11.7----29.93- 43.7- 39.2---
2025-03-25 1520SSW 7.8 9.7 5.2 86.6SSE29.93- 43.5- 39.4---
2025-03-25 1510SSW 9.7 11.7----29.93- 43.2- 39.7---
2025-03-25 1500SSW 9.7 11.7----29.93+0.02 43.2- 39.9---
2025-03-25 1450SSW 9.7 11.7 5.2 86.7SSE29.94- 43.3- 39.4---
2025-03-25 1440 SW 9.7 11.7----29.94- 43.7- 38.7---
2025-03-25 1430 SW 9.7 11.7----29.94- 43.7- 38.7---
2025-03-25 1420 SW 9.7 11.7 5.9 86.8SSE29.94- 43.3- 38.8---
2025-03-25 1410SSW 7.8 9.7 5.9-6.8SSE29.94- 43.2- 39.4---
2025-03-25 1400SSW 7.8 9.7----29.94+0.04 43.2- 39.2---
2025-03-25 1350 SW 7.8 7.8 5.6 96.5SSE29.94- 43.3- 38.7---
2025-03-25 1340 SW 5.8 7.8 5.6-6.5SSE29.94- 43.7- 38.1---
2025-03-25 1330WSW 5.8 7.8----29.93- 43.9- 37.8---
2025-03-25 1320WSW 7.8 9.7 5.9 96.6SSE29.93- 44.2- 37.9---
2025-03-25 1310WSW 7.8 9.7 5.9-6.6SSE29.93- 43.9- 38.3---
2025-03-25 1300WSW 7.8 9.7----29.93+0.07 43.9- 38.8---
2025-03-25 1250WSW 7.8 9.7 6.2 86.7SSE29.93- 43.9- 38.8---
2025-03-25 1240WSW 7.8 11.7 6.2-6.7SSE29.93- 44.1- 38.8---
2025-03-25 1230WSW 7.8 9.7----29.93- 43.7- 38.8---
2025-03-25 1220 W 7.8 9.7 6.2 96.7SSE29.93- 43.5- 39.2---
2025-03-25 1210 W 7.8 9.7 6.2-6.7SSE29.93- 43.3- 39.4---
2025-03-25 1200WSW 7.8 9.7----29.92+0.07 43.2- 39.4---
2025-03-25 1150WSW 5.8 7.8 5.6 96.5SSE29.92- 43.2- 39.2---
2025-03-25 1140WSW 5.8 7.8----29.92- 43.3- 39.2---
2025-03-25 1130WSW 5.8 7.8----29.91- 43.5- 39.0---
2025-03-25 1120WSW 5.8 7.8 6.2 107.0SSE29.91- 43.7- 39.0---
2025-03-25 1110WSW 5.8 7.8 6.2-7.0SSE29.90- 43.5- 39.0---
2025-03-25 1100WSW 5.8 7.8----29.90+0.06 43.7- 39.2---
2025-03-25 1050 W 5.8 7.8 6.2 96.9SSE29.89- 43.9- 39.0---
2025-03-25 1040 W 5.8 7.8 6.2-6.9SSE29.89- 44.2- 39.0---
2025-03-25 1030 W 5.8 7.8----29.88- 44.2- 39.2---
2025-03-25 1020 W 5.8 7.8 6.6 97.0SSE29.88- 44.4- 39.2---
2025-03-25 1010 W 5.8 7.8 6.6-7.0SSE29.87- 44.4- 39.6---
2025-03-25 1000 W 7.8 9.7----29.87+0.04 44.2- 40.1---
2025-03-25 0950 W 7.8 9.7 6.6 97.0SSE29.86- 43.9- 40.3---
2025-03-25 0940 W 5.8 7.8 6.6-7.0SSE29.86- 44.1- 40.5---
2025-03-25 0930 W 5.8 9.7----29.86- 44.4- 40.5---
2025-03-25 0920 W 7.8 9.7 6.6 96.9SSE29.86- 44.4- 40.5---
2025-03-25 0910 W 7.8 9.7 6.6-6.9SSE29.85- 44.6- 40.5---
2025-03-25 0900 W 7.8 11.7----29.85+0.03 44.6- 41.2---
2025-03-25 0850 W 9.7 13.6 6.6 96.8SSE29.84- 44.6- 41.7---
2025-03-25 0840 W 9.7 13.6----29.84- 44.4- 42.4---
2025-03-25 0830 W 9.7 13.6----29.84- 44.2- 43.0---
2025-03-25 0820 W 9.7 13.6 6.2 106.6SSE29.83- 43.9- 43.3---
2025-03-25 0810 W 9.7 13.6 6.2-6.6SSE29.83- 43.9- 43.9---
2025-03-25 0800 W 9.7 13.6----29.84+0.04 44.1- 44.1---
2025-03-25 0750 W 11.7 13.6 6.2 86.5 SE29.83- 44.1- 44.1---
2025-03-25 0740 W 9.7 13.6 6.2-6.5 SE29.83- 44.1- 44.1---
2025-03-25 0730 W 11.7 13.6----29.83- 44.2- 44.2---
2025-03-25 0720 W 11.7 13.6 5.9 96.5 SE29.83- 44.2- 44.2---
2025-03-25 0710 W 11.7 15.5 5.9-6.5 SE29.83- 44.1- 44.1---
2025-03-25 0700 W 11.7 15.5----29.83+0.01 44.1- 44.1---
2025-03-25 0650 W 13.6 15.5 5.9 76.3SSE29.83- 44.1- 44.1---
2025-03-25 0640 W 11.7 13.6----29.83- 43.7- 43.7---
2025-03-25 0630 W 11.7 13.6----29.83- 43.9- 43.9---
2025-03-25 0620 W 11.7 13.6 4.9 86.0SSE29.83- 43.9- 43.9---
2025-03-25 0610WSW 11.7 13.6 4.9-6.0SSE29.82- 44.1- 44.1---
2025-03-25 0600WSW 11.7 13.6----29.82+0.01 44.1- 44.1---
2025-03-25 0550WSW 9.7 13.6 4.9 86.2 S29.81- 43.9- 43.9---
2025-03-25 0540WSW 11.7 13.6----29.81- 43.9- 43.9---
2025-03-25 0530WSW 9.7 13.6----29.80- 43.7- 43.7---
2025-03-25 0520WSW 9.7 11.7 4.9 85.9SSE29.80- 43.2- 43.2---
2025-03-25 0510WSW 7.8 9.7 4.9-5.9SSE29.80- 43.0- 43.0---
2025-03-25 0500WSW 9.7 11.7----29.80+0.00 42.8- 42.8---
2025-03-25 0450WSW 9.7 11.7 4.3 75.8 S29.80- 42.6- 42.6---
2025-03-25 0440WSW 9.7 11.7----29.81- 42.6- 42.6---
2025-03-25 0430 SW 11.7 13.6----29.81- 42.8- 42.8---
2025-03-25 0420 SW 9.7 11.7 3.6 65.3 SE29.81- 42.8- 42.8---
2025-03-25 0410 SW 9.7 11.7 3.6-5.3 SE29.81- 43.2- 43.2---
2025-03-25 0400 SW 7.8 9.7----29.81+0.03 42.6- 42.6---
2025-03-25 0350 SW 7.8 9.7 3.3 65.1 SE29.82- 43.2- 43.2---
2025-03-25 0340 SW 7.8 9.7 3.3-5.1 SE29.82- 43.5- 43.5---
2025-03-25 0330 SW 9.7 11.7----29.82- 43.9- 43.9---
2025-03-25 0320 SW 9.7 11.7 3.0 65.0 SE29.81- 43.9- 43.9---
2025-03-25 0310WSW 9.7 11.7 3.0-5.0 SE29.81- 43.9- 43.9---
2025-03-25 0300 SW 9.7 11.7----29.81+0.05 43.5- 43.5---
2025-03-25 0250WSW 9.7 13.6 3.0 64.8 SE29.81- 43.5- 43.5---
2025-03-25 0240 SW 9.7 13.6----29.81- 43.5- 43.5---
2025-03-25 0230 SW 9.7 11.7----29.81- 43.3- 43.3---
2025-03-25 0220 SW 11.7 13.6 3.3 64.9 SE29.81- 43.7- 43.7---
2025-03-25 0210 SW 9.7 13.6 3.3-4.9 SE29.80- 43.7- 43.7---
2025-03-25 0200 SW 9.7 11.7----29.80+0.06 43.5- 43.5---
2025-03-25 0150 SW 9.7 11.7 3.3 64.9ESE29.80- 43.5- 43.5---
2025-03-25 0140 SW 7.8 9.7----29.80- 43.5- 43.5---
2025-03-25 0130 SW 9.7 11.7----29.80- 43.9- 43.9---
2025-03-25 0120 SW 9.7 11.7 3.3 65.0 SE29.80- 43.9- 43.9---
2025-03-25 0110 SW 9.7 9.7 3.3-5.0 SE29.79- 43.9- 43.9---
2025-03-25 0100 SW 9.7 11.7----29.79+0.06 44.1- 44.1---
2025-03-25 0050 SW 9.7 11.7 3.6 65.1 SE29.79- 43.9- 43.9---
2025-03-25 0040 SW 9.7 11.7----29.78- 44.1- 44.1---
2025-03-25 0030 SW 9.7 9.7----29.78- 43.7- 43.7---
2025-03-25 0020 SW 7.8 9.7 3.9-5.2 SE29.77-------
2025-03-25 0010 SW 9.7 11.7 3.9-5.2 SE29.77- 44.2- 44.2---
2025-03-25 0000 SW 9.7 11.7----29.76+0.01 44.1- 44.1---
2025-03-24 2350 SW 9.7 11.7 3.9 75.0ESE29.75- 44.1- 44.1---
2025-03-24 2340 SW 9.7 11.7----29.76- 43.9- 43.9---
2025-03-24 2320SSW 9.7 11.7 4.3 65.2 SE29.74- 44.1- 44.1---
2025-03-24 2310 SW 9.7 9.7 4.3-5.2 SE29.73- 44.1- 44.1---
2025-03-24 2300 SW 9.7 11.7----29.74+0.01 43.9- 43.9---
2025-03-24 2250SSW 7.8 9.7 4.6 65.1 SE29.72- 44.1- 44.1---
2025-03-24 2240SSW 7.8 9.7----29.72- 44.1- 44.1---
2025-03-24 2230 SW 7.8 9.7----29.72- 44.1- 44.1---
2025-03-24 2220 SW 7.8 11.7 4.3 75.0 SE29.73- 44.2- 44.2---
2025-03-24 2210 SW 7.8 9.7 4.3-5.0 SE29.73- 44.1- 44.1---
2025-03-24 2200SSW 9.7 11.7----29.73-0.02 44.4- 44.4---
2025-03-24 2150SSW 9.7 11.7 5.2 65.3 SE29.73- 44.4- 44.4---
2025-03-24 2140SSW 11.7 13.6----29.74- 44.4- 44.4---
2025-03-24 2130 SW 11.7 13.6----29.74- 44.4- 44.4---
2025-03-24 2120 SW 9.7 13.6 4.9 75.1 SE29.73- 44.8- 44.8---
2025-03-24 2110 SW 11.7 15.5 4.9-5.1 SE29.74- 44.6- 44.6---
2025-03-24 2100 SW 11.7 13.6----29.75+0.00 44.6- 44.6---
2025-03-24 2050 SW 9.7 13.6 5.2 65.2 SE29.74- 44.4- 44.4---
Detailed Wave Summary
for 44025 as of
2040 GMT on 03/25/2025:

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): 5.2 ft
5-day plot - Swell Height Swell Height (SwH): 4.3 ft
5-day plot - Swell Period Swell Period (SwP): 8.3 sec
5-day plot - Swell Direction Swell Direction (SwD):SSE
5-day plot - Wind Wave Height Wind Wave Height (WWH): 2.6 ft
5-day plot - Wind Wave Period Wind Wave Period (WWP): 5.6 sec
5-day plot - Wind Wave Direction Wind Wave Direction (WWD):SSE
5-day plot - Wave Steepness Wave Steepness (STEEPNESS): AVERAGE
5-day plot - Average Wave Period Average Wave Period (APD): 6.0 sec
Previous observations
TIME
(GMT)		 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
2025-03-25 2010 5.6 4.9 9.1SSE 2.6 5.9 SSE AVERAGE 6.3
2025-03-25 1940 5.2 4.6 9.1SSE 2.3 5.6 SSE AVERAGE 6.2
2025-03-25 1910 5.2 4.6 8.3SSE 2.3 5.0 SSE AVERAGE 6.3
2025-03-25 1840 5.2 4.6 8.3SSE 2.3 5.6 SSE AVERAGE 6.4
2025-03-25 1810 5.2 4.9 8.3SSE 2.0 5.0 SSE AVERAGE 6.4
2025-03-25 1740 4.9 4.3 7.7SSE 2.3 5.6 SSE AVERAGE 6.2
2025-03-25 1710 5.2 4.9 9.1SSE 2.0 5.3 SSE AVERAGE 6.4
2025-03-25 1640 4.9 4.9 7.7 S 1.6 4.8 SSE AVERAGE 6.5
2025-03-25 1610 5.9 5.6 8.3SSE 1.6 4.3 SSE AVERAGE 6.8
2025-03-25 1540 5.2 4.9 9.1SSE 1.6 4.5 SSE AVERAGE 6.5
2025-03-25 1510 5.2 5.2 8.3SSE 1.6 3.8 S AVERAGE 6.6
2025-03-25 1440 5.2 5.2 8.3SSE 1.3 4.3 SSE AVERAGE 6.7
2025-03-25 1410 5.9 5.6 8.3SSE 1.3 3.8 S AVERAGE 6.8
2025-03-25 1340 5.6 5.2 9.1SSE 1.3 4.0 S AVERAGE 6.5
2025-03-25 1310 5.9 5.6 9.1SSE 1.3 3.1 W AVERAGE 6.6
2025-03-25 1240 6.2 5.9 8.3SSE 1.3 3.8 SSW AVERAGE 6.7
2025-03-25 1210 6.2 6.2 9.1SSE 1.3 3.1 W AVERAGE 6.7
2025-03-25 1140 5.6 5.6 9.1SSE 1.3 3.8 S AVERAGE 6.5
2025-03-25 1110 6.2 5.9 10.0SSE 1.3 3.8 SSW SWELL 7.0
2025-03-25 1040 6.2 6.2 9.1SSE 1.3 3.6 S AVERAGE 6.9
2025-03-25 1010 6.6 6.2 9.1SSE 1.3 3.4 SSE AVERAGE 7.0
2025-03-25 0940 6.6 6.6 9.1SSE 1.3 4.0 S AVERAGE 7.0
2025-03-25 0910 6.6 6.6 9.1SSE 1.3 3.8 SSW AVERAGE 6.9
2025-03-25 0840 6.6 6.6 9.1SSE 2.0 5.0 SSE AVERAGE 6.8
2025-03-25 0810 6.2 5.9 10.0SSE 2.0 4.0 S SWELL 6.6
2025-03-25 0740 6.2 5.9 8.3 SE 2.0 4.0 S AVERAGE 6.5
2025-03-25 0710 5.9 5.6 9.1 SE 2.3 4.8 SSE AVERAGE 6.5
2025-03-25 0640 5.9 5.2 7.1SSE 2.3 5.0 SSE STEEP 6.3
2025-03-25 0610 4.9 4.3 8.3SSE 2.0 4.8 SE AVERAGE 6.0
2025-03-25 0540 4.9 4.6 7.7 S 2.0 4.8 SSE AVERAGE 6.2
2025-03-25 0510 4.9 4.6 7.7SSE 1.3 4.0 SSE AVERAGE 5.9
2025-03-25 0440 4.3 3.9 7.1 S 1.6 4.3 SSE STEEP 5.8
2025-03-25 0410 3.6 3.3 6.2 SE 1.3 4.2 SSE STEEP 5.3
2025-03-25 0340 3.3 3.0 6.2 SE 1.3 4.0 S STEEP 5.1
2025-03-25 0310 3.0 2.6 6.2 SE 1.6 5.0 SE STEEP 5.0
2025-03-25 0240 3.0 2.6 6.2 SE 1.6 4.0 SSE STEEP 4.8
2025-03-25 0210 3.3 2.6 5.9 SE 1.6 4.8 SE STEEP 4.9
2025-03-25 0140 3.3 3.3 6.2ESE 1.3 4.0 SSE STEEP 4.9
2025-03-25 0110 3.3 3.3 5.9 SE 1.3 3.8 SSE STEEP 5.0
2025-03-25 0040 3.6 3.3 6.2 SE 1.6 4.3 SE STEEP 5.1
2025-03-25 0010 3.9 3.6 6.7 SE 1.6 4.0 SSE STEEP 5.2
2025-03-24 2340 3.9 3.6 6.7ESE 1.6 4.3 SE STEEP 5.0
2025-03-24 2310 4.3 3.9 6.2 SE 1.6 4.0 SSE STEEP 5.2
2025-03-24 2240 4.6 4.3 5.9 SE 1.6 3.6 SSE STEEP 5.1
2025-03-24 2210 4.3 3.9 6.7 SE 1.6 3.6 SSE STEEP 5.0
2025-03-24 2140 5.2 4.3 6.2 SE 3.0 5.3 SE STEEP 5.3
2025-03-24 2110 4.9 3.6 6.7 SE 3.0 5.3 SE STEEP 5.1

Plot of wave energy versus frequency (and period)