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Station 44014 (LLNR 550) - VIRGINIA BEACH 64 NM East of Virginia Beach, VA Image indicating link to RSS feed of recent meteorological observations for station 44014

Owned and maintained by National Data Buoy Center
2.1-meter ionomer foam buoy
SCOOP payload
36.603 N 74.837 W (36°36'10" N 74°50'13" W)

Site elevation: sea level
Air temp height: 2.8 m above site elevation
Anemometer height: 3.2 m above site elevation
Barometer elevation: 1.8 m above mean sea level
Sea temp depth: 1.1 m below water line
Water depth: 49.1 m
Watch circle radius: 102 yards

Right whales are active off VA 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

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 44014

Regional HF Radar Surface Current Observations

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Station 44014
Buoy Camera Photos taken at 03/29/2025 0550 UTC. Click photo to enlarge.
Photos from Buoy Camera at station 44014Photos are generally taken hourly during daylight operations.

Conditions at 44014 as of
(4:30 am EDT)
0830 GMT on 03/29/2025:
     

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):SSW ( 200 deg true )
5-day plot - Wind Speed Wind Speed (WSPD): 15.5 kts
5-day plot - Wind Gust Wind Gust (GST): 19.4 kts
5-day plot - Atmospheric Pressure Atmospheric Pressure (PRES):30.18 in
5-day plot - Air Temperature Air Temperature (ATMP): 54.9 °F
5-day plot - Water Temperature Water Temperature (WTMP): 49.8 °F
5-day plot - Dew Point Dew Point (DEWP): 54.0 °F
5-day plot - Wind Speed at 10 Meters Wind Speed at 10 meters (WSPD10M): 17.5 kts
5-day plot - Wind Speed at 20 Meters Wind Speed at 20 meters (WSPD20M): 19.4 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 (EDT)5-day plot - 1-Minute Wind Speed WSPD 5-day plot - 1-Minute Wind Direction WDIR
4:26 am 17.5 kts-
Previous observations
TIME
(EDT)		 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
2025-03-29 04:20 amSSW 15.5 19.4 5.2 74.9SSE30.18- 54.7 49.8 53.8---
2025-03-29 04:10 amSSW 15.5 19.4 5.2-4.9SSE30.18- 54.7 49.8 53.8---
2025-03-29 04:00 amSSW 13.6 17.5----30.18-0.04 54.5 49.8 53.6---
2025-03-29 03:50 amSSW 13.6 15.5 5.6 74.9SSE30.18- 54.1- 53.2---
2025-03-29 03:40 amSSW 13.6 17.5 5.6-4.9SSE30.19- 54.7 49.8 53.8---
2025-03-29 03:30 amSSW 13.6 19.4----30.19- 54.9 49.8 54.0---
2025-03-29 03:20 amSSW 15.5 19.4 4.9 74.6SSE30.20- 55.0 49.8 54.1---
2025-03-29 03:10 amSSW 15.5 17.5----30.20- 55.0 49.8 54.1---
2025-03-29 03:00 amSSW 15.5 17.5----30.20-0.02 54.9 49.8 54.0---
2025-03-29 02:50 amSSW 13.6 17.5 5.9 75.0 S30.20- 55.0- 54.1---
2025-03-29 02:40 amSSW 15.5 17.5 5.9-5.0 S30.21- 55.0 49.8 54.1---
2025-03-29 02:30 amSSW 15.5 19.4----30.21- 55.2 49.8 54.3---
2025-03-29 02:20 amSSW 15.5 19.4 5.2 74.7SSE30.21- 55.0 50.0 54.1---
2025-03-29 02:10 amSSW 15.5 19.4----30.21- 55.2 50.0 54.3---
2025-03-29 02:00 amSSW 17.5 19.4----30.21+0.00 55.4 50.0 54.5---
2025-03-29 01:50 amSSW 15.5 19.4 5.2 64.8SSE30.21- 55.2 50.0 54.3---
2025-03-29 01:40 amSSW 15.5 19.4----30.21- 55.2 50.0 54.3---
2025-03-29 01:30 amSSW 15.5 19.4----30.22- 55.0 50.0 54.1---
2025-03-29 01:20 am SW 15.5 19.4 5.2 64.7 S30.22- 55.0- 54.1---
2025-03-29 01:10 amSSW 15.5 19.4 5.2-4.7 S30.22- 55.2 50.0 54.1---
2025-03-29 01:00 amSSW 15.5 19.4----30.22+0.01 55.2 50.0 54.1---
2025-03-29 12:50 amSSW 15.5 21.4 5.2 74.7SSE30.22- 55.4 50.0 54.3---
2025-03-29 12:40 amSSW 15.5 19.4 5.2-4.7SSE30.22- 55.4 50.2 54.3---
2025-03-29 12:30 amSSW 15.5 19.4----30.22- 55.0 50.2 54.0---
2025-03-29 12:20 amSSW 15.5 19.4 5.2 74.7SSE30.22- 55.0- 54.0---
2025-03-29 12:10 amSSW 15.5 19.4 5.2-4.7SSE30.22- 55.0 50.2 54.0---
2025-03-29 12:00 amSSW 15.5 19.4----30.22+0.01 55.0 50.2 54.0---
2025-03-28 11:50 pmSSW 15.5 19.4 4.9 64.4 S30.22- 55.0 50.2 54.0---
2025-03-28 11:40 pmSSW 15.5 19.4----30.22- 55.0 50.2 54.0---
2025-03-28 11:30 pmSSW 15.5 19.4----30.22- 55.0 50.0 54.0---
2025-03-28 11:20 pmSSW 15.5 19.4 4.9 64.4 S30.21- 55.0 50.0 54.0---
2025-03-28 11:10 pmSSW 15.5 21.4 4.9-4.4 S30.21- 55.0 50.0 53.6---
2025-03-28 11:00 pmSSW 17.5 21.4----30.21+0.00 55.4 50.0 54.0---
2025-03-28 10:50 pmSSW 17.5 21.4 5.6 54.4 S30.21- 55.6- 54.1---
2025-03-28 10:40 pmSSW 17.5 21.4 5.6-4.4 S30.21- 55.8 50.0 54.3---
2025-03-28 10:30 pmSSW 19.4 23.3----30.21- 55.9 50.0 54.3---
2025-03-28 10:20 pmSSW 19.4 23.3 4.6 64.3 S30.21- 56.3 50.2 54.5---
2025-03-28 10:10 pmSSW 17.5 23.3 4.6-4.3 S30.21- 56.1 50.2 54.3---
2025-03-28 10:00 pmSSW 17.5 21.4----30.21+0.02 55.9 50.2 54.1---
2025-03-28 09:50 pmSSW 17.5 21.4 4.9 54.3 S30.21- 56.1 50.2 54.3---
2025-03-28 09:40 pmSSW 19.4 23.3----30.22- 56.1 50.2 54.1---
2025-03-28 09:30 pmSSW 17.5 23.3 4.9-4.3 S30.21- 55.9 50.2 54.0---
2025-03-28 09:20 pmSSW 17.5 23.3 4.9 54.3SSW30.21- 55.9 50.2 54.0---
2025-03-28 09:10 pmSSW 17.5 21.4 4.9-4.3SSW30.21- 55.9 50.2 54.0---
2025-03-28 09:00 pmSSW 17.5 21.4----30.21+0.01 55.9 50.2 54.0---
2025-03-28 08:50 pmSSW 17.5 21.4 4.9 54.2SSW30.21- 55.6 50.2 53.6---
2025-03-28 08:40 pmSSW 17.5 21.4 4.9-4.2SSW30.21- 55.6 50.2 53.6---
2025-03-28 08:30 pmSSW 19.4 23.3----30.21- 56.1 50.2 54.0---
2025-03-28 08:20 pmSSW 19.4 23.3 4.9 54.1SSW30.20- 55.9 50.2 53.8---
2025-03-28 08:10 pmSSW 19.4 25.3 4.9-4.1SSW30.20- 55.8 50.2 53.6---
2025-03-28 08:00 pmSSW 19.4 23.3----30.20-0.02 55.8 50.2 53.6---
2025-03-28 07:50 pmSSW 19.4 23.3 4.9 54.1 S30.20- 55.8- 53.6---
2025-03-28 07:40 pmSSW 19.4 23.3----30.20- 55.9 50.2 53.6---
2025-03-28 07:20 pmSSW 19.4 23.3 4.3 54.0SSW30.19- 55.9 50.2 53.6---
2025-03-28 07:10 pmSSW 19.4 25.3----30.19- 56.3 50.2 54.0---
2025-03-28 07:00 pmSSW 19.4 25.3----30.19-0.05 56.3 50.2 54.0---
2025-03-28 06:50 pmSSW 19.4 25.3 4.3 53.9SSW30.19- 56.3 50.2 53.8---
2025-03-28 06:40 pmSSW 19.4 23.3 4.3-3.9SSW30.20- 56.5 50.2 53.8---
2025-03-28 06:30 pmSSW 19.4 25.3----30.20- 56.5 50.2 53.8---
2025-03-28 06:20 pmSSW 19.4 23.3 3.9 53.8SSW30.20- 56.3 50.2 53.6---
2025-03-28 06:10 pmSSW 19.4 23.3----30.20- 56.3 50.2 53.6---
2025-03-28 06:00 pm S 17.5 23.3 3.9-3.8SSW30.20-0.06 56.1 50.2 53.4---
2025-03-28 05:50 pm S 17.5 21.4 3.6-3.8SSW30.21- 55.9 50.2 53.2---
2025-03-28 05:40 pm S 17.5 21.4 3.6-3.8SSW30.21- 55.9 50.2 53.2---
2025-03-28 05:30 pmSSW 17.5 21.4----30.21- 55.8 50.2 53.1---
2025-03-28 05:20 pmSSW 17.5 19.4 3.9 43.8SSW30.21- 55.8 50.2 53.1---
2025-03-28 05:10 pmSSW 15.5 19.4 3.9-3.8SSW30.22- 55.6 50.2 52.7---
2025-03-28 05:00 pmSSW 17.5 19.4----30.22-0.07 55.9 50.2 53.1---
2025-03-28 04:50 pmSSW 17.5 21.4 3.6 43.7SSW30.22- 56.1- 52.9---
2025-03-28 04:40 pmSSW 17.5 21.4 3.6-3.7SSW30.22- 56.3 50.2 53.1---
2025-03-28 04:30 pmSSW 15.5 19.4----30.22- 55.8 50.2 52.9---
2025-03-28 04:20 pmSSW 15.5 19.4 3.3 43.6SSW30.23- 55.6 50.2 52.7---
2025-03-28 04:10 pmSSW 15.5 19.4 3.3-3.6SSW30.23- 55.6 50.2 52.7---
2025-03-28 04:00 pmSSW 15.5 19.4----30.24-0.09 55.4 50.2 52.5---
2025-03-28 03:50 pmSSW 15.5 19.4 3.0-3.5 S30.24- 55.4 50.2 52.5---
2025-03-28 03:40 pm--- 3.0 43.5 S--------
2025-03-28 03:30 pmSSW 15.5 19.4----30.25- 55.6 50.2 52.3---
2025-03-28 03:20 pmSSW 15.5 19.4 3.0 43.5SSW30.25- 55.8- 52.5---
2025-03-28 03:10 pmSSW 15.5 19.4 3.0-3.5SSW30.25- 55.6 50.2 52.2---
2025-03-28 03:00 pmSSW 15.5 19.4----30.26-0.06 55.4 50.2 52.2---
2025-03-28 02:50 pmSSW 15.5 17.5 2.6 33.4SSW30.27- 55.4 50.2 52.2---
2025-03-28 02:40 pmSSW 15.5 17.5 2.6-3.4SSW30.27- 55.4 50.2 52.2---
2025-03-28 02:30 pmSSW 15.5 19.4----30.28- 55.2 50.2 52.0---
2025-03-28 02:20 pmSSW 15.5 19.4 2.3 33.5SSW30.28- 55.2- 52.0---
2025-03-28 02:10 pmSSW 15.5 17.5 2.3-3.5SSW30.29- 55.2 50.4 51.8---
2025-03-28 02:00 pmSSW 13.6 17.5----30.29-0.06 55.0 50.4 51.8---
2025-03-28 01:50 pmSSW 13.6 15.5 2.0 83.4ESE30.29- 55.0 50.4 51.8---
2025-03-28 01:40 pmSSW 11.7 15.5----30.30- 54.9 50.4 51.6---
2025-03-28 01:30 pmSSW 11.7 15.5----30.31- 54.7 50.4 51.6---
2025-03-28 01:20 pmSSW 11.7 13.6 2.0 83.6 SE30.31- 54.3 50.4 51.6---
2025-03-28 01:10 pm SW 9.7 11.7 2.0-3.6 SE30.31- 54.0 50.4 51.4---
2025-03-28 01:00 pmSSW 7.8 9.7----30.32-0.03 53.4 50.4 51.1---
2025-03-28 12:50 pmSSW 7.8 9.7 2.0 33.5 S30.32- 53.2 50.2 51.1---
2025-03-28 12:40 pmSSW 7.8 9.7 2.0-3.5 S30.32- 53.2 50.2 51.1---
2025-03-28 12:30 pmSSW 9.7 11.7----30.32- 53.1 50.2 51.1---
2025-03-28 12:20 pmSSW 9.7 11.7 2.0 33.5SSW30.32- 53.1- 50.9---
2025-03-28 12:10 pmSSW 11.7 13.6 2.0-3.5SSW30.32- 53.1 50.0 51.1---
2025-03-28 12:00 pmSSW 11.7 13.6----30.32-0.03 53.1 50.0 51.1---
2025-03-28 11:50 am SW 11.7 13.6 2.0-3.5SSW30.34- 52.9 50.0 50.9---
2025-03-28 11:40 amSSW 11.7 13.6----30.33- 52.9 50.0 50.9---
2025-03-28 11:30 amSSW 11.7 13.6----30.34- 52.7 49.8 50.7---
2025-03-28 11:20 amSSW 9.7 13.6 2.0 33.4SSW30.34- 52.7 49.8 50.7---
2025-03-28 11:10 amSSW 11.7 13.6 2.0-3.4SSW30.34- 52.7 49.8 50.5---
2025-03-28 11:00 am SW 11.7 13.6----30.35+0.01 52.7 49.6 50.4---
2025-03-28 10:50 am SW 11.7 13.6 2.0 33.4 S30.35- 52.7- 50.4---
2025-03-28 10:40 amSSW 11.7 13.6 2.0-3.4 S30.35- 52.7 49.6 50.2---
2025-03-28 10:30 amSSW 11.7 13.6----30.35- 52.7 49.5 50.2---
2025-03-28 10:20 amSSW 11.7 13.6 2.0 33.3SSW30.35- 52.7- 50.0---
2025-03-28 10:10 am SW 11.7 13.6 2.0-3.3SSW30.35- 52.7 49.5 49.8---
2025-03-28 10:00 am SW 11.7 13.6----30.35+0.03 52.9 49.5 49.8---
2025-03-28 09:50 amSSW 11.7 13.6 2.0 33.3SSW30.35- 52.9- 49.6---
2025-03-28 09:40 amSSW 9.7 11.7 2.0-3.3SSW30.35- 52.7 49.3 49.5---
2025-03-28 09:30 amSSW 9.7 11.7----30.35- 52.5 49.3 49.5---
2025-03-28 09:20 amSSW 9.7 11.7 2.0 33.2SSW30.35- 52.5 49.3 49.3---
2025-03-28 09:10 amSSW 9.7 11.7----30.35- 52.5 49.3 49.3---
2025-03-28 09:00 amSSW 11.7 13.6----30.35+0.05 52.7 49.3 49.1---
2025-03-28 08:50 amSSW 11.7 13.6 2.0 33.1SSW30.35- 52.5 49.3 48.9---
2025-03-28 08:40 amSSW 11.7 13.6 2.0-3.1SSW30.35- 52.3 49.3 48.7---
2025-03-28 08:30 amSSW 11.7 13.6----30.35- 52.5 49.3 48.6---
2025-03-28 08:20 amSSW 11.7 13.6 2.0 33.3SSW30.34- 52.7 49.3 48.4---
2025-03-28 08:10 amSSW 11.7 13.6 2.0-3.3SSW30.34- 52.7 49.3 48.0---
2025-03-28 08:00 amSSW 11.7 13.6----30.34+0.04 52.7 49.3 48.0---
2025-03-28 07:50 amSSW 11.7 15.5 2.0 33.2SSW30.34- 52.9 49.3 47.8---
2025-03-28 07:40 amSSW 13.6 15.5----30.33- 52.9 49.3 47.7---
2025-03-28 07:30 amSSW 13.6 15.5----30.33- 53.1 49.3 47.5---
2025-03-28 07:20 amSSW 13.6 15.5 2.0 33.1SSW30.33- 53.1- 47.3---
2025-03-28 07:10 amSSW 13.6 15.5 2.0-3.1SSW30.33- 53.1 49.3 47.5---
2025-03-28 07:00 amSSW 11.7 15.5----30.33+0.03 52.7 49.3 47.7---
2025-03-28 06:50 amSSW 13.6 17.5 2.0 33.2 S30.32- 52.9 49.3 47.8---
2025-03-28 06:40 amSSW 13.6 15.5----30.32- 52.7 49.3 47.8---
2025-03-28 06:30 amSSW 11.7 15.5----30.32- 52.7 49.3 47.8---
2025-03-28 06:20 amSSW 13.6 15.5 1.6 33.1SSW30.32- 52.5- 47.7---
2025-03-28 06:10 amSSW 13.6 15.5 1.6-3.1SSW30.31- 52.5 49.3 47.7---
2025-03-28 06:00 amSSW 11.7 15.5----30.31+0.00 52.3 49.3 47.7---
2025-03-28 05:50 amSSW 11.7 13.6 1.6 133.2SSE30.30- 52.3 49.3 47.5---
2025-03-28 05:40 amSSW 11.7 13.6 1.6-3.2SSE30.30- 52.3 49.3 47.3---
2025-03-28 05:30 amSSW 11.7 15.5----30.30- 52.3 49.3 47.3---
2025-03-28 05:20 am S 11.7 13.6 1.6 133.4ESE30.30- 52.2- 47.1---
2025-03-28 05:10 amSSW 11.7 13.6 1.6-3.4ESE30.30- 52.2 49.3 47.1---
2025-03-28 05:00 amSSW 11.7 13.6----30.30-0.04 52.3 49.3 46.9---
2025-03-28 04:50 am--- 2.0-3.2SSW30.30-- 49.3----
2025-03-28 04:40 amSSW 11.7 13.6 2.0-3.2SSW30.30- 52.3 49.3 46.8---
2025-03-28 04:30 amSSW 11.7 13.6----30.30- 52.3 49.3 46.6---
2025-03-28 04:20 am S 11.7 13.6 1.6 23.3 S30.30- 52.3- 46.6---
2025-03-28 04:10 am S 11.7 15.5----30.30- 52.3 49.3 46.6---
2025-03-28 04:00 am S 11.7 13.6----30.30-0.05 52.2 49.3 46.4---
2025-03-28 03:50 am S 11.7 15.5 1.6 133.4 SE30.30- 52.0- 46.8---
Detailed Wave Summary
for 44014 as of (4:10 am EDT)
0810 GMT on 03/29/2025:

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 - Wave Steepness Wave Steepness (STEEPNESS): STEEP
5-day plot - Average Wave Period Average Wave Period (APD): 4.9 sec
Previous observations
TIME
(EDT)		 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
2025-03-29 03:40 am 5.6------ STEEP 4.9
2025-03-29 03:10 am 4.9------ STEEP 4.6
2025-03-29 02:40 am 5.9------ STEEP 5.0
2025-03-29 02:10 am 5.2------ STEEP 4.7
2025-03-29 01:40 am 5.2------ STEEP 4.8
2025-03-29 01:10 am 5.2------ STEEP 4.7
2025-03-29 12:40 am 5.2------ STEEP 4.7
2025-03-29 12:10 am 5.2------ STEEP 4.7
2025-03-28 11:40 pm 4.9------VERY_STEEP 4.4
2025-03-28 11:10 pm 4.9------VERY_STEEP 4.4
2025-03-28 10:40 pm 5.6------VERY_STEEP 4.4
2025-03-28 10:10 pm 4.6------VERY_STEEP 4.3
2025-03-28 09:39 pm 4.9------VERY_STEEP 4.3
2025-03-28 09:10 pm 4.9------VERY_STEEP 4.3
2025-03-28 08:40 pm 4.9------VERY_STEEP 4.2
2025-03-28 08:10 pm 4.9------VERY_STEEP 4.1
2025-03-28 07:40 pm 4.9------VERY_STEEP 4.1
2025-03-28 07:10 pm 4.3------VERY_STEEP 4.0
2025-03-28 06:40 pm 4.3------VERY_STEEP 3.9
2025-03-28 06:10 pm 3.9------VERY_STEEP 3.8
2025-03-28 05:40 pm 3.6------VERY_STEEP 3.8
2025-03-28 05:10 pm 3.9------VERY_STEEP 3.8
2025-03-28 04:40 pm 3.6------VERY_STEEP 3.7
2025-03-28 04:10 pm 3.3------VERY_STEEP 3.6
2025-03-28 03:40 pm 3.0------VERY_STEEP 3.5
2025-03-28 03:10 pm 3.0------VERY_STEEP 3.5
2025-03-28 02:40 pm 2.6------VERY_STEEP 3.4
2025-03-28 02:10 pm 2.3------ N/A 3.5
2025-03-28 01:40 pm 2.0------ N/A 3.4
2025-03-28 01:10 pm 2.0------ N/A 3.6
2025-03-28 12:40 pm 2.0------ N/A 3.5
2025-03-28 12:10 pm 2.0------ N/A 3.5
2025-03-28 11:40 am 2.0------ N/A 3.5
2025-03-28 11:10 am 2.0------ N/A 3.4
2025-03-28 10:40 am 2.0------ N/A 3.4
2025-03-28 10:09 am 2.0------ N/A 3.3
2025-03-28 09:40 am 2.0------ N/A 3.3
2025-03-28 09:10 am 2.0------ N/A 3.2
2025-03-28 08:40 am 2.0------ N/A 3.1
2025-03-28 08:10 am 2.0------ N/A 3.3
2025-03-28 07:40 am 2.0------ N/A 3.2
2025-03-28 07:10 am 2.0------ N/A 3.1
2025-03-28 06:40 am 2.0------ N/A 3.2
2025-03-28 06:10 am 1.6------ N/A 3.1
2025-03-28 05:40 am 1.6------ N/A 3.2
2025-03-28 05:10 am 1.6------ N/A 3.4
2025-03-28 04:40 am 2.0------ N/A 3.2
2025-03-28 04:10 am 1.6------ N/A 3.3

Plot of wave energy versus frequency (and period)