Station 51003 (LLNR 28005.7) - WESTERN HAWAII - 205 NM SW of Honolulu, HI Image indicating link to RSS feed of recent meteorological observations for station 51003


Conditions at 51003 as of
(6:50 pm HAST on 04/19/2024)
0450 GMT on 04/20/2024:
     

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): NE ( 50 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): 6.9 ft
5-day plot - Dominant Wave Period Dominant Wave Period (DPD): 8 sec
5-day plot - Average Wave Period Average Period (APD): 6.4 sec
5-day plot - Mean Wave Direction Mean Wave Direction (MWD):NNE ( 33 deg true )
5-day plot - Atmospheric Pressure Atmospheric Pressure (PRES):30.04 in
5-day plot - Air Temperature Air Temperature (ATMP): 75.7 °F
5-day plot - Dew Point Dew Point (DEWP): 69.8 °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 (HAST)5-day plot - 1-Minute Wind Speed WSPD 5-day plot - 1-Minute Wind Direction WDIR
6:49 pm 13.6 kts-
Previous observations
TIME
(HAST)
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
2024-04-19 06:40 pmENE 11.7 15.5----30.05- 75.7- 69.8---
2024-04-19 06:30 pmENE 11.7 15.5----30.04- 75.7- 69.8---
2024-04-19 06:20 pmENE 11.7 13.6 6.9 86.4 NE30.04- 75.7- 70.3---
2024-04-19 06:10 pmENE 11.7 13.6 6.9-6.4 NE30.04- 75.7- 70.3---
2024-04-19 06:00 pmENE 11.7 13.6----30.03+0.00 75.9- 70.2---
2024-04-19 05:50 pmENE 11.7 15.5 6.9 76.4NNE30.03- 75.7- 69.8---
2024-04-19 05:40 pmENE 11.7 15.5 6.9-6.4NNE30.03- 75.6- 70.0---
2024-04-19 05:30 pmENE 11.7 13.6----30.03- 75.4- 70.0---
2024-04-19 05:20 pmENE 11.7 13.6 6.9 86.3NNE30.03- 75.0- 70.3---
2024-04-19 05:10 pm NE 11.7 13.6 6.9-6.3NNE30.03- 75.0- 70.5---
2024-04-19 05:00 pm NE 11.7 15.5----30.03-0.02 75.2- 70.5---
2024-04-19 04:50 pmENE 13.6 15.5 7.2 76.5 NE30.03- 75.4- 70.2---
2024-04-19 04:40 pmENE 11.7 15.5----30.03- 75.6- 70.2---
2024-04-19 04:30 pm NE 11.7 15.5----30.03- 75.4- 70.0---
2024-04-19 04:20 pm NE 13.6 15.5 7.2 86.7NNE30.02- 75.2- 70.3---
2024-04-19 04:10 pm NE 13.6 15.5 7.2-6.7NNE30.03- 75.4- 70.7---
2024-04-19 04:00 pm NE 13.6 15.5----30.03-0.05 75.4- 70.0---
2024-04-19 03:50 pmENE 11.7 13.6 6.6 86.7 NE30.03- 75.7- 70.2---
2024-04-19 03:40 pm NE 11.7 15.5----30.03- 75.7- 69.6---
2024-04-19 03:30 pmENE 11.7 13.6----30.03- 75.6- 69.1---
2024-04-19 03:20 pmENE 9.7 13.6 6.9 86.6NNE30.03- 75.7- 70.2---
2024-04-19 03:10 pm NE 9.7 11.7 6.9-6.6NNE30.03- 75.4- 69.8---
2024-04-19 03:00 pm NE 9.7 11.7----30.03-0.07 75.4- 69.8---
2024-04-19 02:50 pm NE 9.7 13.6 6.6 76.4 NE30.03- 75.4- 69.6---
2024-04-19 02:40 pmENE 11.7 13.6 6.6-6.4 NE30.04- 75.0- 69.1---
2024-04-19 02:30 pmENE 11.7 15.5----30.04- 75.0- 69.4---
2024-04-19 02:20 pmENE 13.6 15.5 7.2 86.6 NE30.04- 74.8- 70.0---
2024-04-19 02:10 pmENE 13.6 17.5 7.2-6.6 NE30.04- 75.6- 70.3---
2024-04-19 02:00 pmENE 11.7 15.5----30.05-0.06 75.6- 69.8---
2024-04-19 01:50 pmENE 11.7 15.5 6.9 86.5NNE30.05- 75.6- 69.6---
2024-04-19 01:40 pmENE 11.7 15.5----30.06- 75.4- 69.3---
2024-04-19 01:20 pmENE 11.7 15.5 6.9 86.3NNE30.06- 75.2- 69.4---
2024-04-19 01:10 pmENE 11.7 15.5 6.9-6.3NNE30.07- 74.8- 69.4---
2024-04-19 01:00 pmENE 11.7 15.5----30.08-0.04 74.8- 70.2---
2024-04-19 12:50 pmENE 13.6 15.5 7.2 86.5NNE30.09- 74.8- 70.5---
2024-04-19 12:40 pmENE 13.6 17.5 7.2-6.5NNE30.09- 74.8- 70.2---
2024-04-19 12:30 pmENE 13.6 15.5----30.09- 75.0- 70.0---
2024-04-19 12:20 pmENE 13.6 15.5 7.2 86.2NNE30.09- 75.2- 69.6---
2024-04-19 12:10 pmENE 11.7 15.5 7.2-6.2NNE30.10- 74.8- 69.8---
2024-04-19 12:00 pm NE 13.6 17.5----30.10+0.00 74.7- 70.2---
2024-04-19 11:50 amENE 13.6 17.5 7.2 76.4NNE30.11- 74.8- 70.2---
2024-04-19 11:40 amENE 13.6 15.5----30.11- 75.0- 69.8---
2024-04-19 11:30 amENE 13.6 19.4----30.11- 75.2- 69.8---
2024-04-19 11:20 amENE 13.6 15.5 7.2 96.4NNE30.11- 75.4- 70.0---
2024-04-19 11:10 amENE 11.7 15.5 7.2-6.4NNE30.11- 75.2- 69.8---
2024-04-19 11:00 amENE 13.6 15.5----30.11+0.01 75.6- 70.2---
2024-04-19 10:50 am E 11.7 15.5 7.5 86.5NNE30.11- 75.9- 68.7---
2024-04-19 10:40 amENE 11.7 15.5 7.5-6.5NNE30.11- 76.1- 68.9---
2024-04-19 10:30 am E 11.7 13.6----30.11- 76.1- 68.4---
2024-04-19 10:20 am E 11.7 15.5 6.9 106.4 N30.11- 76.1- 68.2---
2024-04-19 10:10 am E 11.7 13.6 6.9-6.4 N30.11- 76.1- 68.0---
2024-04-19 10:00 am E 11.7 15.5----30.11+0.04 76.1- 68.2---
2024-04-19 09:50 am E 11.7 15.5 7.2 96.6 N30.11- 75.9- 68.2---
2024-04-19 09:40 am E 11.7 13.6----30.11- 76.1- 69.1---
2024-04-19 09:30 am E 13.6 15.5----30.11- 76.1- 68.2---
2024-04-19 09:20 am E 11.7 15.5 6.6 86.4NNE30.11- 75.9- 68.4---
2024-04-19 09:10 am E 13.6 17.5 6.6-6.4NNE30.11- 75.9- 68.4---
2024-04-19 09:00 am E 13.6 17.5----30.10+0.05 75.7- 68.0---
2024-04-19 08:50 amENE 13.6 17.5 7.2 106.5 N30.10- 75.7- 68.5---
2024-04-19 08:40 amENE 13.6 17.5 7.2-6.5 N30.10- 75.7- 68.9---
2024-04-19 08:30 amENE 13.6 17.5----30.10- 75.7- 69.1---
2024-04-19 08:20 amENE 13.6 17.5 6.6 96.1NNE30.10- 75.6- 68.5---
2024-04-19 08:10 amENE 13.6 17.5 6.6-6.1NNE30.09- 75.7- 68.9---
2024-04-19 08:00 amENE 13.6 17.5----30.10+0.06 75.7- 68.0---
2024-04-19 07:50 am E 11.7 15.5 6.2 96.2 N30.09- 76.1- 68.4---
2024-04-19 07:40 am E 13.6 15.5----30.09- 75.7- 67.8---
2024-04-19 07:30 amENE 13.6 15.5----30.09- 75.7- 68.2---
2024-04-19 07:20 amENE 11.7 15.5 6.6 116.3 N30.08- 75.9- 68.2---
2024-04-19 07:10 amENE 13.6 17.5 6.6-6.3 N30.08- 75.9- 68.4---
2024-04-19 07:00 am E 13.6 17.5----30.07+0.03 75.9- 67.8---
2024-04-19 06:50 am E 13.6 17.5 6.9 86.5NNE30.07- 75.9- 68.0---
2024-04-19 06:40 am E 13.6 17.5 6.9-6.5NNE30.06- 75.9- 67.6---
2024-04-19 06:30 am E 13.6 15.5----30.06- 75.7- 66.9---
2024-04-19 06:20 am E 13.6 17.5 7.5 106.5 NE30.06- 75.6- 67.5---
2024-04-19 06:10 amENE 15.5 17.5----30.06- 75.7- 67.8---
2024-04-19 06:00 amENE 15.5 19.4----30.05+0.01 75.7- 67.8---
2024-04-19 05:50 am E 15.5 19.4 7.2 106.6 NE30.05- 75.9- 67.3---
2024-04-19 05:40 am E 13.6 17.5 7.2-6.6 NE30.05- 75.7- 66.9---
2024-04-19 05:30 am E 13.6 17.5----30.05- 75.9- 67.3---
2024-04-19 05:20 am E 13.6 17.5 6.9 106.5NNE30.04- 75.9- 67.3---
2024-04-19 05:10 am E 13.6 17.5----30.04- 75.7- 67.1---
2024-04-19 05:00 amENE 13.6 15.5 6.9-6.5NNE30.04-0.01 75.4- 67.6---
2024-04-19 04:50 amENE 11.7 15.5 6.6 116.4 N30.04- 75.0- 68.4---
2024-04-19 04:40 amENE 13.6 15.5----30.04- 74.8- 68.5---
2024-04-19 04:30 amENE 15.5 17.5 6.6-6.4 N30.04- 75.6- 68.2---
2024-04-19 04:20 am E 13.6 17.5 6.9 116.6 N30.03- 75.6- 68.0---
2024-04-19 04:10 amENE 13.6 17.5 6.9-6.6 N30.03- 75.6- 68.0---
2024-04-19 04:00 amENE 13.6 17.5----30.04-0.03 75.7- 68.4---
2024-04-19 03:50 amENE 13.6 17.5 6.9 116.7 N30.04- 75.7- 67.8---
2024-04-19 03:40 amENE 13.6 17.5 6.9-6.7 N30.03- 75.7- 68.4---
2024-04-19 03:30 amENE 13.6 15.5----30.04- 75.7- 68.0---
2024-04-19 03:20 amENE 13.6 15.5 7.2 116.7 N30.03- 75.7- 68.2---
2024-04-19 03:10 amENE 13.6 15.5 7.2-6.7 N30.03- 75.6- 67.5---
2024-04-19 03:00 am NE 13.6 17.5----30.04-0.04 75.7- 68.5---
2024-04-19 02:50 am NE 13.6 17.5 6.9 116.4 N30.04- 75.6- 68.0---
2024-04-19 02:40 am NE 11.7 15.5 6.9-6.4 N30.04- 75.7- 67.8---
2024-04-19 02:30 am NE 13.6 15.5----30.04- 75.7- 67.5---
2024-04-19 02:20 am NE 13.6 17.5 6.9 106.5NNE30.05- 75.7- 67.5---
2024-04-19 02:10 amENE 13.6 19.4 6.9-6.5NNE30.05- 75.7- 67.5---
2024-04-19 02:00 am NE 15.5 17.5----30.05-0.04 75.7- 67.1---
2024-04-19 01:50 am NE 13.6 17.5 6.9 106.4NNE30.05- 75.7- 67.5---
2024-04-19 01:40 am NE 13.6 17.5----30.06- 75.9- 67.8---
2024-04-19 01:30 am NE 13.6 19.4----30.06- 75.7- 67.5---
2024-04-19 01:20 am NE 15.5 19.4 6.6 96.5NNE30.07- 75.7- 67.8---
2024-04-19 01:10 am NE 15.5 19.4----30.06- 75.9- 68.2---
2024-04-19 01:00 am NE 15.5 17.5----30.07-0.01 75.9- 68.0---
2024-04-19 12:50 am NE 13.6 17.5 6.9 106.6 N30.07- 75.9- 68.0---
2024-04-19 12:40 am NE 13.6 17.5----30.07- 75.9- 67.6---
2024-04-19 12:30 am NE 15.5 17.5----30.07- 75.9- 67.5---
2024-04-19 12:20 am NE 13.6 17.5 7.2 116.6 N30.07- 75.9- 67.6---
2024-04-19 12:10 am NE 15.5 17.5 7.2-6.6 N30.07- 75.7- 66.9---
2024-04-19 12:00 am NE 15.5 17.5----30.08+0.01 75.7- 66.9---
2024-04-18 11:50 pm NE 15.5 17.5 6.9 86.7NNE30.08- 75.9- 67.5---
2024-04-18 11:40 pm NE 15.5 17.5 6.9-6.7NNE30.08- 75.9- 67.6---
2024-04-18 11:30 pm NE 15.5 17.5----30.09- 75.9- 67.6---
2024-04-18 11:20 pm NE 15.5 17.5 6.9 116.6 N30.09- 75.9- 66.7---
2024-04-18 11:10 pm NE 15.5 17.5 6.9-6.6 N30.09- 75.9- 66.9---
2024-04-18 11:00 pm NE 15.5 19.4----30.09+0.04 75.9- 67.8---
2024-04-18 10:50 pm NE 15.5 19.4 6.9 116.7 N30.09- 76.1- 68.5---
2024-04-18 10:40 pm NE 13.6 17.5----30.08- 76.1- 68.0---
2024-04-18 10:30 pm NE 13.6 15.5----30.08- 76.1- 67.3---
2024-04-18 10:20 pm NE 13.6 17.5 7.2 96.8 N30.08- 75.9- 67.5---
2024-04-18 10:10 pm NE 13.6 17.5 7.2-6.8 N30.08- 76.1- 68.5---
2024-04-18 10:00 pmENE 13.6 17.5----30.08+0.04 76.1- 68.2---
2024-04-18 09:50 pm NE 13.6 17.5 7.2 116.9 N30.08- 76.1- 68.4---
2024-04-18 09:40 pm NE 13.6 15.5----30.08- 76.3- 68.0---
2024-04-18 09:30 pm NE 13.6 15.5----30.08- 76.5- 67.8---
2024-04-18 09:20 pm NE 13.6 15.5 7.2 117.1 N30.08- 76.3- 66.9---
2024-04-18 09:10 pm NE 13.6 17.5 7.2-7.1 N30.07- 76.1- 67.3---
2024-04-18 09:00 pm NE 13.6 15.5----30.07+0.06 76.3- 67.5---
2024-04-18 08:50 pm NE 13.6 15.5 6.9 96.9 N30.07- 76.3- 67.3---
2024-04-18 08:40 pm NE 13.6 19.4 6.9-6.9 N30.07- 76.3- 67.3---
2024-04-18 08:30 pm NE 13.6 15.5----30.06- 76.3- 67.8---
2024-04-18 08:20 pmENE 13.6 17.5 7.2 117.4 N30.06- 76.3- 67.8---
2024-04-18 08:10 pmENE 11.7 15.5 7.2-7.4 N30.05- 76.5- 68.4---
2024-04-18 08:00 pmENE 11.7 15.5----30.05+0.05 76.3- 67.6---
2024-04-18 07:50 pmENE 11.7 13.6 7.9 107.5NNE30.05- 76.3- 67.6---
2024-04-18 07:40 pmENE 11.7 15.5----30.05- 76.3- 67.8---
2024-04-18 07:30 pmENE 11.7 13.6----30.04- 76.5- 68.0---
2024-04-18 07:20 pmENE 9.7 13.6 7.2 117.5 N30.04- 76.3- 67.3---
2024-04-18 07:10 pmENE 11.7 13.6----30.04- 76.1- 67.1---
2024-04-18 07:00 pmENE 11.7 13.6----30.04+0.03 76.1- 67.6---
2024-04-18 06:50 pmENE 11.7 15.5 7.2 117.3 N30.03- 76.5- 68.2---

Detailed Wave Summary
for 51003 as of
(6:40 pm HAST on 04/19/2024)
0440 GMT on 04/20/2024:

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): 6.9 ft
5-day plot - Swell Height Swell Height (SwH): 5.9 ft
5-day plot - Swell Period Swell Period (SwP): 7.7 sec
5-day plot - Swell Direction Swell Direction (SwD):NNE
5-day plot - Wind Wave Height Wind Wave Height (WWH): 3.3 ft
5-day plot - Wind Wave Period Wind Wave Period (WWP): 5.9 sec
5-day plot - Wind Wave Direction Wind Wave Direction (WWD):ENE
5-day plot - Wave Steepness Wave Steepness (STEEPNESS): STEEP
5-day plot - Average Wave Period Average Wave Period (APD): 6.4 sec
Previous observations
TIME
(HAST)
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
2024-04-19 06:10 pm 6.9 6.2 7.7 NE 3.0 4.8 NE STEEP 6.4
2024-04-19 05:40 pm 6.9 6.2 7.1NNE 3.0 5.6 ENE STEEP 6.4
2024-04-19 05:10 pm 6.9 5.9 8.3NNE 3.0 5.6 NE AVERAGE 6.3
2024-04-19 04:40 pm 7.2 6.2 7.1 NE 3.3 5.3 NE STEEP 6.5
2024-04-19 04:10 pm 7.2 6.2 8.3NNE 3.6 6.2 NE STEEP 6.7
2024-04-19 03:40 pm 6.6 5.9 7.7 NE 3.0 5.6 NE STEEP 6.7
2024-04-19 03:10 pm 6.9 6.6 8.3NNE 2.0 3.8 E AVERAGE 6.6
2024-04-19 02:40 pm 6.6 5.9 7.1 NE 2.6 5.3 ENE STEEP 6.4
2024-04-19 02:10 pm 7.2 5.9 8.3 NE 4.3 5.9 NE STEEP 6.6
2024-04-19 01:40 pm 6.9 6.2 8.3NNE 3.0 4.8 ENE AVERAGE 6.5
2024-04-19 01:10 pm 6.9 5.9 8.3NNE 3.6 5.9 NE AVERAGE 6.3
2024-04-19 12:40 pm 7.2 6.2 8.3NNE 3.6 5.6 ENE STEEP 6.5
2024-04-19 12:10 pm 7.2 6.2 8.3NNE 3.9 5.6 NE STEEP 6.2
2024-04-19 11:40 am 7.2 5.9 7.1NNE 4.3 5.9 NE STEEP 6.4
2024-04-19 11:10 am 7.2 6.2 9.1NNE 3.3 5.6 ENE AVERAGE 6.4
2024-04-19 10:40 am 7.5 6.6 8.3NNE 3.3 5.0 NE STEEP 6.5
2024-04-19 10:10 am 6.9 6.2 10.0 N 3.0 4.5 NE AVERAGE 6.4
2024-04-19 09:40 am 7.2 6.6 9.1 N 3.0 4.0 E AVERAGE 6.6
2024-04-19 09:10 am 6.6 5.2 8.3NNE 3.9 5.0 NE AVERAGE 6.4
2024-04-19 08:40 am 7.2 5.9 10.0 N 4.3 5.6 NE AVERAGE 6.5
2024-04-19 08:10 am 6.6 4.9 9.1NNE 4.3 5.9 NNE AVERAGE 6.1
2024-04-19 07:40 am 6.2 5.2 9.1 N 3.6 5.9 NNE AVERAGE 6.2
2024-04-19 07:10 am 6.6 4.9 10.8 N 4.6 6.2 NNE SWELL 6.3
2024-04-19 06:40 am 6.9 5.6 7.7NNE 4.3 6.2 NNE STEEP 6.5
2024-04-19 06:10 am 7.5 5.6 10.0 NE 4.9 7.1 N AVERAGE 6.5
2024-04-19 05:40 am 7.2 5.6 10.0 NE 4.3 5.6 NNE AVERAGE 6.6
2024-04-19 05:10 am 6.9 5.6 10.0NNE 4.3 6.7 N AVERAGE 6.5
2024-04-19 04:40 am 6.6 5.6 10.8 N 3.6 5.9 NNE SWELL 6.4
2024-04-19 04:10 am 6.9 5.6 10.8 N 3.9 5.9 NNE SWELL 6.6
2024-04-19 03:40 am 6.9 5.9 10.8 N 3.6 5.3 NE SWELL 6.7
2024-04-19 03:10 am 7.2 5.9 10.8 N 4.3 6.7 N SWELL 6.7
2024-04-19 02:40 am 6.9 5.9 10.8 N 3.6 5.9 N SWELL 6.4
2024-04-19 02:10 am 6.9 5.9 10.0NNE 3.9 6.2 NNE AVERAGE 6.5
2024-04-19 01:40 am 6.9 5.2 10.0NNE 4.3 6.7 N AVERAGE 6.4
2024-04-19 01:10 am 6.6 5.2 9.1NNE 3.9 5.0 NE AVERAGE 6.5
2024-04-19 12:40 am 6.9 5.6 10.0 N 3.9 6.7 N AVERAGE 6.6
2024-04-19 12:10 am 7.2 5.6 10.8 N 4.3 6.7 NNE SWELL 6.6
2024-04-18 11:40 pm 6.9 5.6 8.3NNE 3.9 5.6 NNE AVERAGE 6.7
2024-04-18 11:10 pm 6.9 5.9 11.4 N 3.6 5.6 NNE SWELL 6.6
2024-04-18 10:40 pm 6.9 5.9 10.8 N 3.6 6.2 N SWELL 6.7
2024-04-18 10:10 pm 7.2 5.9 9.1 N 3.6 6.2 N AVERAGE 6.8
2024-04-18 09:40 pm 7.2 6.2 10.8 N 3.3 5.9 NNE SWELL 6.9
2024-04-18 09:10 pm 7.2 6.6 11.4 N 3.3 5.0 NNE SWELL 7.1
2024-04-18 08:40 pm 6.9 5.9 9.1 N 3.6 6.7 N AVERAGE 6.9
2024-04-18 08:10 pm 7.2 6.6 11.4 N 2.6 5.6 NNE SWELL 7.4
2024-04-18 07:40 pm 7.9 7.5 10.0NNE 2.3 5.0 NNE AVERAGE 7.5
2024-04-18 07:10 pm 7.2 6.9 10.8 N 2.0 4.5 NNE SWELL 7.5

Plot of wave energy versus frequency (and period)