Station 46085 (LLNR 984.15) - CENTRAL GULF OF ALASKA - 265NM West of Cape Ommaney, AK Image indicating link to RSS feed of recent meteorological observations for station 46085


Conditions at 46085 as of
(8:30 am AKDT)
1630 GMT on 08/10/2026:
     

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): N ( 350 deg true )
5-day plot - Wind Speed Wind Speed (WSPD): 5.8 kts
5-day plot - Wind Gust Wind Gust (GST): 7.8 kts
5-day plot - Atmospheric Pressure Atmospheric Pressure (PRES):30.16 in
5-day plot - Air Temperature Air Temperature (ATMP): 55.9 °F
5-day plot - Dew Point Dew Point (DEWP): 54.9 °F
5-day plot - Wind Speed at 10 Meters Wind Speed at 10 meters (WSPD10M): 5.8 kts
5-day plot - Wind Speed at 20 Meters Wind Speed at 20 meters (WSPD20M): 7.8 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 (AKDT)Pressure
8:30 am30.16 in
Highest 1-minute Wind Speed
Time (AKDT)5-day plot - 1-Minute Wind Speed WSPD 5-day plot - 1-Minute Wind Direction WDIR
8:22 am 7.8 kts N ( 350 deg true )
Previous observations
TIME
(AKDT)
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
2026-08-10 08:20 am N 7.8 7.8 2.0 125.6SSW30.16- 56.1- 55.0---
2026-08-10 08:10 am N 7.8 7.8 2.0-5.6SSW30.16- 56.1- 54.9---
2026-08-10 08:00 am N 7.8 7.8----30.16+0.00 55.8- 54.7---
2026-08-10 07:50 am N 7.8 9.7 1.6 135.3 S30.16- 55.6- 54.7---
2026-08-10 07:40 am N 9.7 11.7----30.16- 55.9- 55.2---
2026-08-10 07:30 am N 7.8 11.7----30.16- 56.7- 54.7---
2026-08-10 07:20 am N 3.9 7.8 2.0 135.7 S30.16- 56.5- 54.3---
2026-08-10 07:10 am N 3.9 5.8 2.0-5.7 S30.16- 55.9- 54.1---
2026-08-10 07:00 am N 7.8 9.7----30.16+0.00 55.9- 54.3---
2026-08-10 06:50 am N 9.7 11.7 2.0 126.2SSW30.16- 55.9- 54.7---
2026-08-10 06:40 am N 7.8 11.7 2.0-6.2SSW30.16- 56.5- 54.3---
2026-08-10 06:30 am N 7.8 9.7----30.16- 56.8- 53.8---
2026-08-10 06:20 amNNE 7.8 9.7 2.0 116.8SSW30.16- 57.0- 53.8---
2026-08-10 06:10 amNNE 5.8 7.8 2.0-6.8SSW30.16- 57.0- 53.6---
2026-08-10 06:00 amNNE 7.8 7.8----30.16+0.00 57.2- 53.6---
2026-08-10 05:50 amNNE 7.8 7.8 1.6 175.7 SW30.16- 57.2- 53.4---
2026-08-10 05:40 amNNE 5.8 7.8 1.6-5.7 SW30.16- 57.2- 53.4---
2026-08-10 05:30 amNNE 5.8 7.8----30.16- 57.2- 53.4---
2026-08-10 05:20 amNNE 5.8 7.8 2.0 116.0SSW30.16- 57.2- 53.8---
2026-08-10 05:10 amNNE 5.8 7.8 2.0-6.0SSW30.16- 57.2- 53.8---
2026-08-10 05:00 amNNE 7.8 7.8----30.16+0.00 57.2- 53.8---
2026-08-10 04:50 amNNE 7.8 9.7 2.3 136.6SSW30.16- 57.0- 53.6---
2026-08-10 04:40 amNNE 7.8 9.7----30.16- 57.2- 53.8---
2026-08-10 04:30 amNNE 7.8 11.7----30.16- 57.4- 54.1---
2026-08-10 04:20 amNNE 7.8 9.7 2.0 136.2 S30.16- 57.4- 53.8---
2026-08-10 04:10 amNNE 7.8 7.8 2.0-6.2 S30.16- 57.4- 53.4---
2026-08-10 04:00 amNNE 7.8 7.8----30.17+0.00 57.4- 53.4---
2026-08-10 03:50 amNNE 7.8 9.7 2.0 136.7SSW30.16- 57.4- 53.6---
2026-08-10 03:40 am N 5.8 7.8----30.16- 57.2- 53.4---
2026-08-10 03:30 amNNE 5.8 7.8----30.16- 57.2- 54.0---
2026-08-10 03:20 amNNE 5.8 9.7 2.0 116.1WSW30.16- 57.0- 54.0---
2026-08-10 03:10 am N 5.8 7.8 2.0-6.1WSW30.16- 57.2- 54.1---
2026-08-10 03:00 am N 5.8 7.8----30.16+0.00 57.2- 54.1---
2026-08-10 02:50 am N 3.9 5.8 2.0 126.0WSW30.16- 56.8- 53.8---
2026-08-10 02:40 am N 5.8 7.8 2.0-6.0WSW30.16- 56.8- 54.0---
2026-08-10 02:30 am N 3.9 7.8----30.16- 56.8- 53.8---
2026-08-10 02:20 am N 5.8 9.7 1.6 136.1SSW30.16- 57.0- 53.8---
2026-08-10 02:10 am N 7.8 9.7----30.16- 57.2- 53.8---
2026-08-10 02:00 am N 7.8 9.7----30.16-0.01 57.4- 53.8---
2026-08-10 01:50 am N 7.8 7.8 2.0 136.2SSW30.16- 57.4- 53.6---
2026-08-10 01:40 am N 7.8 9.7----30.16- 57.6- 53.8---
2026-08-10 01:30 am N 7.8 9.7----30.16- 57.7- 53.8---
2026-08-10 01:20 am N 7.8 9.7 2.0 126.4SSW30.16- 57.9- 54.3---
2026-08-10 01:10 am N 5.8 5.8 2.0-6.4SSW30.16- 57.7- 54.0---
2026-08-10 01:00 am N 5.8 7.8----30.16-0.01 57.7- 53.8---
2026-08-10 12:50 am N 5.8 7.8 2.0 166.0SSW30.16- 57.7- 53.8---
2026-08-10 12:40 am N 5.8 7.8 2.0-6.0SSW30.16- 57.6- 53.4---
2026-08-10 12:30 am N 5.8 7.8----30.16- 57.6- 53.8---
2026-08-10 12:20 am N 5.8 7.8 2.0 136.0 SW30.17- 57.7- 54.3---
2026-08-10 12:10 am N 5.8 7.8----30.16- 57.7- 54.3---
2026-08-10 12:00 am N 7.8 7.8----30.17+0.00 57.7- 54.3---
2026-08-09 11:50 pm N 5.8 7.8 2.0 116.1 S30.17- 57.7- 54.7---
2026-08-09 11:40 pm N 5.8 7.8 2.0-6.1 S30.17- 57.7- 54.7---
2026-08-09 11:30 pm N 5.8 5.8----30.17- 57.7- 54.7---
2026-08-09 11:20 pm N 5.8 5.8 2.0 126.2SSW30.17- 57.7- 54.7---
2026-08-09 11:10 pm N 5.8 7.8----30.17- 57.7- 54.7---
2026-08-09 11:00 pm N 5.8 7.8 2.0-6.2SSW30.17+0.00 57.7- 54.5---
2026-08-09 10:50 pm N 5.8 5.8 2.0 136.4 S30.17- 57.7- 54.3---
2026-08-09 10:40 pm N 5.8 5.8----30.17- 57.9- 54.5---
2026-08-09 10:30 pm N 3.9 5.8----30.18- 57.9- 54.3---
2026-08-09 10:20 pm N 5.8 5.8 2.0 136.4SSE30.18- 57.9- 54.3---
2026-08-09 10:10 pm N 5.8 7.8 2.0-6.4SSE30.18- 57.9- 54.1---
2026-08-09 10:00 pm N 5.8 7.8----30.18+0.00 57.9- 54.0---
2026-08-09 09:50 pm N 5.8 5.8 2.0 126.5SSW30.18- 57.9- 54.1---
2026-08-09 09:40 pmNNE 5.8 5.8----30.18- 57.9- 54.3---
2026-08-09 09:30 pmNNE 5.8 5.8----30.18- 57.9- 54.3---
2026-08-09 09:20 pm N 3.9 5.8 1.6 116.3SSW30.18- 57.9- 54.5---
2026-08-09 09:10 pm N 3.9 5.8----30.18- 57.9- 54.3---
2026-08-09 09:00 pmNNE 5.8 5.8----30.18-0.01 57.9- 54.3---
2026-08-09 08:50 pmNNE 3.9 5.8 2.0 136.7SSE30.17- 57.9- 54.5---
2026-08-09 08:40 pmNNE 3.9 5.8 2.0-6.7SSE30.17- 57.9- 54.9---
2026-08-09 08:30 pmNNE 3.9 5.8----30.17- 57.9- 54.7---
2026-08-09 08:20 pmNNE 3.9 5.8 2.0 126.7SSW30.17- 57.9- 54.7---
2026-08-09 08:10 pmNNE 3.9 5.8 2.0-6.7SSW30.17- 57.9- 54.5---
2026-08-09 08:00 pmNNE 3.9 5.8----30.17-0.01 57.9- 54.3---
2026-08-09 07:50 pmNNE 3.9 5.8 2.0 126.8 SW30.17- 57.9- 54.3---
2026-08-09 07:40 pmNNE 3.9 5.8 2.0-6.8 SW30.17- 57.9- 54.1---
2026-08-09 07:30 pmNNE 3.9 5.8----30.17- 57.9- 54.1---
2026-08-09 07:20 pmNNE 5.8 5.8 2.0 126.8SSW30.17- 57.9- 54.1---
2026-08-09 07:10 pmNNE 5.8 5.8 2.0-6.8SSW30.17- 57.9- 54.1---
2026-08-09 07:00 pm NE 5.8 5.8----30.18-0.02 57.9- 54.0---
2026-08-09 06:50 pmNNE 5.8 5.8 2.0 137.1 S30.18- 57.9- 54.0---
2026-08-09 06:40 pm NE 5.8 5.8 2.0-7.1 S30.18- 57.9- 54.1---
2026-08-09 06:30 pm NE 5.8 5.8----30.18- 57.9- 54.1---
2026-08-09 06:20 pm NE 5.8 5.8 2.0 126.8 SW30.18- 57.9- 54.0---
2026-08-09 06:10 pmNNE 5.8 7.8 2.0-6.8 SW30.18- 57.9- 53.8---
2026-08-09 06:00 pm NE 5.8 5.8----30.19-0.02 57.9- 53.6---
2026-08-09 05:50 pm NE 5.8 5.8 2.0 126.9SSW30.19- 57.9- 54.0---
2026-08-09 05:40 pmNNE 5.8 5.8----30.19- 57.9- 54.1---
2026-08-09 05:30 pmNNE 5.8 7.8----30.18- 57.9- 54.1---
2026-08-09 05:20 pmNNE 5.8 7.8 2.0 137.0SSE30.19- 57.9- 54.1---
2026-08-09 05:10 pmNNE 5.8 7.8 2.0-7.0SSE30.19- 57.9- 54.0---
2026-08-09 05:00 pm NE 5.8 7.8----30.19-0.03 57.9- 54.1---
2026-08-09 04:50 pm NE 5.8 7.8 2.0 126.6SSW30.19- 57.9- 54.0---
2026-08-09 04:40 pm NE 5.8 9.7 2.0-6.6SSW30.19- 57.9- 54.1---
2026-08-09 04:30 pmNNE 5.8 7.8----30.19- 57.9- 54.0---
2026-08-09 04:20 pmNNE 5.8 7.8 2.0 136.9 S30.19- 57.9- 54.0---
2026-08-09 04:10 pm NE 5.8 7.8 2.0-6.9 S30.20- 57.9- 54.1---
2026-08-09 04:00 pm NE 5.8 7.8----30.20-0.01 57.9- 54.1---
2026-08-09 03:50 pm NE 5.8 7.8 2.0 136.9 SW30.20- 57.9- 54.3---
2026-08-09 03:40 pm- 5.8 7.8----30.20-------
2026-08-09 03:10 pmNNE 5.8 7.8 2.0-6.4 SW30.20- 57.9- 54.5---
2026-08-09 03:00 pmNNE 5.8 7.8----30.20-0.01 57.9- 54.7---
2026-08-09 02:50 pmNNE 5.8 7.8 2.3 126.5SSW30.20- 57.9- 54.7---
2026-08-09 02:40 pm NE 5.8 7.8 2.3-6.5SSW30.21- 57.9- 54.7---
2026-08-09 02:30 pm NE 5.8 7.8----30.21- 57.9- 54.7---
2026-08-09 02:20 pmNNE 5.8 7.8 2.0 126.6 SW30.21- 57.9- 54.5---
2026-08-09 02:10 pm NE 5.8 7.8 2.0-6.6 SW30.21- 57.9- 54.1---
2026-08-09 02:00 pm NE 5.8 7.8----30.21+0.00 57.9- 54.1---
2026-08-09 01:50 pm NE 7.8 7.8 2.0 126.3SSW30.21- 57.9- 54.0---
2026-08-09 01:40 pm NE 7.8 7.8 2.0-6.3SSW30.21- 57.9- 54.0---
2026-08-09 01:30 pm NE 7.8 7.8----30.21- 57.9- 54.0---
2026-08-09 01:20 pm NE 5.8 7.8 2.0 136.2SSW30.21- 57.9- 54.0---
2026-08-09 01:10 pm NE 5.8 7.8 2.0-6.2SSW30.21- 57.9- 54.1---
2026-08-09 01:00 pm NE 5.8 7.8----30.21+0.00 57.9- 54.3---
2026-08-09 12:50 pm NE 5.8 7.8 2.0 136.4SSW30.21- 57.9- 54.3---
2026-08-09 12:40 pm NE 5.8 5.8----30.21- 57.9- 54.3---
2026-08-09 12:30 pm NE 5.8 5.8----30.22- 57.9- 54.3---
2026-08-09 12:20 pm NE 5.8 7.8 2.0 136.3SSW30.21- 57.9- 54.3---
2026-08-09 12:10 pm NE 5.8 7.8 2.0-6.3SSW30.21- 58.1- 54.3---
2026-08-09 12:00 pm NE 5.8 5.8----30.21+0.00 58.1- 53.8---
2026-08-09 11:50 am NE 3.9 5.8 2.0 136.4 S30.21- 58.1- 53.8---
2026-08-09 11:40 am NE 3.9 5.8----30.21- 58.1- 53.6---
2026-08-09 11:30 am NE 3.9 5.8----30.21- 57.9- 53.4---
2026-08-09 11:20 am NE 5.8 5.8 2.0 136.0 SW30.21- 58.1- 53.8---
2026-08-09 11:10 am NE 5.8 5.8 2.0-6.0 SW30.21- 58.1- 53.6---
2026-08-09 11:00 am NE 5.8 5.8----30.21+0.00 57.9- 53.6---
2026-08-09 10:50 am NE 5.8 5.8 2.3 136.3 S30.21- 57.9- 54.1---
2026-08-09 10:40 am NE 5.8 7.8 2.3-6.3 S30.21- 57.9- 54.1---
2026-08-09 10:30 am NE 5.8 7.8----30.21- 57.9- 54.0---
2026-08-09 10:20 am NE 5.8 7.8 2.0 136.0SSE30.21- 57.9- 54.0---
2026-08-09 10:10 amENE 5.8 5.8 2.0-6.0SSE30.22- 57.9- 54.0---
2026-08-09 10:00 amENE 5.8 5.8----30.22+0.00 57.9- 54.0---
2026-08-09 09:50 amENE 5.8 5.8 2.3 126.4 S30.22- 57.9- 54.1---
2026-08-09 09:40 amENE 5.8 7.8----30.22- 57.9- 54.0---
2026-08-09 09:30 amENE 5.8 7.8----30.22- 57.9- 54.1---
2026-08-09 09:20 amENE 5.8 5.8 2.3 126.6SSE30.22- 57.7- 53.8---
2026-08-09 09:10 amENE 5.8 7.8 2.3-6.6SSE30.22- 57.7- 54.0---
2026-08-09 09:00 amENE 5.8 7.8----30.22+0.00 57.6- 53.8---
2026-08-09 08:50 amENE 7.8 7.8 2.0 136.4SSW30.22- 57.6- 54.0---
2026-08-09 08:40 amENE 7.8 9.7----30.22- 57.6- 54.1---
2026-08-09 08:30 amENE 7.8 9.7----30.22- 57.6- 54.1---
2026-08-09 08:20 amENE 7.8 7.8 2.3 126.8 S30.22- 57.6- 54.3---
2026-08-09 08:10 am NE 7.8 7.8----30.22- 57.6- 54.1---
2026-08-09 08:00 amENE 5.8 7.8----30.22-0.01 57.6- 54.3---
2026-08-09 07:50 amENE 5.8 7.8 2.0 136.6 S30.22- 57.6- 54.0---

Wave Summary
for 46085 as of (8:10 am AKDT)
1610 GMT on 08/10/2026:

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): 2.0 ft
5-day plot - Swell Height Swell Height (SwH): 1.6 ft
5-day plot - Swell Period Swell Period (SwP): 12.1 sec
5-day plot - Swell Direction Swell Direction (SwD):SSW
5-day plot - Wind Wave Height Wind Wave Height (WWH): 0.7 ft
5-day plot - Wind Wave Period Wind Wave Period (WWP): 2.9 sec
5-day plot - Wind Wave Direction Wind Wave Direction (WWD): N
5-day plot - Average Wave Period Average Wave Period (APD): 5.6 sec
Previous observations
TIME
(AKDT)
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
2026-08-10 07:40 am 1.6 1.6 12.9 S 1.0 2.7 N N/A 5.3
2026-08-10 07:10 am 2.0 1.6 12.9 S 0.7 2.7 NNW N/A 5.7
2026-08-10 06:40 am 2.0 1.6 12.1SSW 0.7 2.9 NNE N/A 6.2
2026-08-10 06:10 am 2.0 2.0 11.4SSW 0.7 3.8 NNW N/A 6.8
2026-08-10 05:40 am 1.6 1.6 17.4 SW 0.7 2.7 N N/A 5.7
2026-08-10 05:10 am 2.0 1.6 11.4SSW 0.7 4.0 N N/A 6.0
2026-08-10 04:40 am 2.3 2.0 12.9SSW 0.7 2.6 NNE N/A 6.6
2026-08-10 04:10 am 2.0 1.6 12.9 S 0.7 3.7 WNW N/A 6.2
2026-08-10 03:40 am 2.0 2.0 12.9SSW 0.7 4.0 NW N/A 6.7
2026-08-10 03:10 am 2.0 1.6 11.4WSW 0.7 3.8 NW N/A 6.1
2026-08-10 02:40 am 2.0 1.6 12.1WSW 0.7 4.0 WNW N/A 6.0
2026-08-10 02:10 am 1.6 1.6 12.9SSW 0.7 3.0 NNW N/A 6.1
2026-08-10 01:40 am 2.0 1.6 12.9SSW 0.7 3.8 NNW N/A 6.2
2026-08-10 01:10 am 2.0 2.0 12.1SSW 0.7 3.3 NNW N/A 6.4
2026-08-10 12:40 am 2.0 1.6 16.0SSW 0.7 3.3 NW N/A 6.0
2026-08-10 12:10 am 2.0 1.6 12.9 SW 0.7 3.8 NW N/A 6.0
2026-08-09 11:40 pm 2.0 1.6 11.4 S 0.7 3.6 NNW N/A 6.1
2026-08-09 11:10 pm 2.0 1.6 12.1SSW 0.7 3.7 NW N/A 6.2
2026-08-09 10:40 pm 2.0 1.6 12.9 S 0.7 3.6 NW N/A 6.4
2026-08-09 10:10 pm 2.0 2.0 12.9SSE 0.7 3.7 NW N/A 6.4
2026-08-09 09:40 pm 2.0 1.6 12.1SSW 0.7 4.0 NW N/A 6.5
2026-08-09 09:10 pm 1.6 1.6 11.4SSW 0.7 3.8 NW N/A 6.3
2026-08-09 08:40 pm 2.0 2.0 12.9SSE 0.7 3.7 NNE N/A 6.7
2026-08-09 08:10 pm 2.0 2.0 12.1SSW 0.7 3.4 ESE N/A 6.7
2026-08-09 07:40 pm 2.0 2.0 12.1 SW 0.7 3.8 NW N/A 6.8
2026-08-09 07:10 pm 2.0 2.0 12.1SSW 0.7 4.0 E N/A 6.8
2026-08-09 06:40 pm 2.0 2.0 12.9 S 0.7 4.0 N N/A 7.1
2026-08-09 06:10 pm 2.0 2.0 12.1 SW 0.7 3.6 NNE N/A 6.8
2026-08-09 05:40 pm 2.0 2.0 12.1SSW 0.7 3.7 ESE N/A 6.9
2026-08-09 05:10 pm 2.0 2.0 12.9SSE 0.7 3.4 ESE N/A 7.0
2026-08-09 04:40 pm 2.0 1.6 12.1SSW 0.7 3.8 SE N/A 6.6
2026-08-09 04:10 pm 2.0 2.0 12.9 S 0.7 3.4 SE N/A 6.9
2026-08-09 03:40 pm 2.0 2.0 12.9 SW 0.7 3.7 SE N/A 6.9
2026-08-09 03:10 pm 2.0 2.0 12.1 SW 0.7 3.7 SE N/A 6.4
2026-08-09 02:40 pm 2.3 2.0 12.1SSW 0.7 4.0 SE N/A 6.5
2026-08-09 02:10 pm 2.0 2.0 12.1 SW 0.7 3.8 NW N/A 6.6
2026-08-09 01:40 pm 2.0 2.0 12.1SSW 0.7 3.1 NNW N/A 6.3
2026-08-09 01:10 pm 2.0 2.0 12.9SSW 0.7 3.6 NNW N/A 6.2
2026-08-09 12:40 pm 2.0 2.0 12.9SSW 0.7 4.0 E N/A 6.4
2026-08-09 12:10 pm 2.0 2.0 12.9SSW 0.7 3.6 NNW N/A 6.3
2026-08-09 11:40 am 2.0 2.0 12.9 S 0.7 3.8 N N/A 6.4
2026-08-09 11:10 am 2.0 2.0 12.9 SW 0.7 3.4 NNW N/A 6.0
2026-08-09 10:40 am 2.3 2.3 12.9 S 0.7 3.6 NNW N/A 6.3
2026-08-09 10:10 am 2.0 2.0 12.9SSE 0.7 3.7 NNW N/A 6.0
2026-08-09 09:40 am 2.3 2.0 12.1 S 0.7 3.6 NNW N/A 6.4
2026-08-09 09:10 am 2.3 2.3 12.1SSE 0.7 3.8 NNW N/A 6.6
2026-08-09 08:40 am 2.0 2.0 12.9SSW 0.7 4.0 NW N/A 6.4
2026-08-09 08:10 am 2.3 2.3 12.1 S 0.7 4.0 NNW N/A 6.8

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