Hurricane Symbol View the latest observations near East Pacific Tropical Storm Dalila.

Station 46013 (LLNR 390) - BODEGA BAY - 48NM NW of San Francisco, CA Image indicating link to RSS feed of recent meteorological observations for station 46013


Conditions at 46013 as of
(10:00 pm PDT on 06/13/2025)
0500 GMT on 06/14/2025:
     

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): NW ( 310 deg true )
5-day plot - Wind Speed Wind Speed (WSPD): 23.3 kts
5-day plot - Wind Gust Wind Gust (GST): 31.1 kts
5-day plot - Atmospheric Pressure Atmospheric Pressure (PRES):29.91 in
5-day plot - Pressure Tendency Pressure Tendency (PTDY):+0.01 in ( Rising )
5-day plot - Air Temperature Air Temperature (ATMP): 53.2 °F
5-day plot - Dew Point Dew Point (DEWP): 50.4 °F
5-day plot - Wind Chill Wind Chill (CHILL): 46.8 °F
5-day plot - Wind Speed at 10 Meters Wind Speed at 10 meters (WSPD10M): 27.2 kts
5-day plot - Wind Speed at 20 Meters Wind Speed at 20 meters (WSPD20M): 29.1 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 (PDT)5-day plot - 1-Minute Wind Speed WSPD 5-day plot - 1-Minute Wind Direction WDIR
9:55 pm 25.3 kts-
Previous observations
TIME
(PDT)
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
2025-06-13 09:50 pm NW 25.3 31.1 8.5 95.9 NW29.90- 53.2- 50.4---
2025-06-13 09:40 pm NW 23.3 29.1 8.5-5.9 NW29.90- 53.2- 50.4---
2025-06-13 09:30 pm NW 25.3 31.1----29.89- 53.2- 50.4---
2025-06-13 09:20 pm NW 25.3 29.1 8.5 85.8 NW29.89- 53.2- 50.4---
2025-06-13 09:10 pm NW 25.3 33.0 8.5-5.8 NW29.89- 53.2- 50.4---
2025-06-13 09:00 pm NW 25.3 33.0----29.89-0.01 53.2- 50.4---
2025-06-13 08:50 pm NW 25.3 31.1 8.5 85.7 NW29.89- 53.2- 50.4---
2025-06-13 08:40 pm NW 25.3 31.1----29.89- 53.4- 50.5---
2025-06-13 08:30 pm NW 25.3 31.1----29.89- 53.4- 50.2---
2025-06-13 08:20 pm NW 25.3 31.1 8.5 85.8 NW29.89- 53.6- 50.4---
2025-06-13 08:10 pm NW 25.3 31.1----29.89- 53.6- 50.4---
2025-06-13 08:00 pm NW 25.3 31.1----29.89+0.00 53.6- 50.4---
2025-06-13 07:50 pm NW 25.3 33.0 8.2 85.7 NW29.89- 53.6- 50.4---
2025-06-13 07:40 pm NW 25.3 31.1 8.2-5.7 NW29.89- 53.6- 50.5---
2025-06-13 07:30 pm NW 25.3 33.0----29.89- 53.6- 50.5---
2025-06-13 07:20 pm NW 25.3 31.1 8.5 85.8 NW29.89- 53.8- 50.5---
2025-06-13 07:10 pm NW 25.3 31.1 8.5-5.8 NW29.89- 53.8- 50.5---
2025-06-13 07:00 pm NW 25.3 31.1----29.89-0.02 53.8- 50.5---
2025-06-13 06:50 pm NW 25.3 31.1 8.5 75.7 NW29.89- 53.8- 50.5---
2025-06-13 06:40 pm NW 25.3 31.1----29.89- 53.8- 50.5---
2025-06-13 06:30 pm NW 25.3 31.1----29.89- 53.8- 50.5---
2025-06-13 06:20 pm NW 25.3 31.1 8.5 85.8 NW29.90- 53.8- 50.5---
2025-06-13 06:10 pm NW 25.3 33.0 8.5-5.8 NW29.90- 53.8- 50.5---
2025-06-13 06:00 pm NW 23.3 29.1----29.90-0.03 53.8- 50.7---
2025-06-13 05:50 pm NW 23.3 31.1 7.9 75.6 NW29.90- 53.8- 50.9---
2025-06-13 05:40 pm NW 23.3 29.1 7.9-5.6 NW29.90- 53.6- 50.7---
2025-06-13 05:30 pm NW 23.3 31.1----29.90- 53.6- 50.7---
2025-06-13 05:20 pm NW 23.3 29.1 8.9 95.8NNW29.90- 53.6- 50.7---
2025-06-13 05:10 pm NW 23.3 33.0----29.90- 53.6- 50.7---
2025-06-13 05:00 pm NW 23.3 31.1----29.90-0.04 53.6- 50.7---
2025-06-13 04:50 pm NW 23.3 31.1 8.5 85.9 NW29.90- 53.6- 50.7---
2025-06-13 04:40 pm NW 25.3 31.1----29.90- 53.6- 50.7---
2025-06-13 04:30 pm NW 23.3 31.1----29.90- 53.6- 50.7---
2025-06-13 04:20 pm NW 23.3 29.1 8.9 65.9 NW29.91- 53.4- 50.9---
2025-06-13 04:10 pm NW 23.3 29.1 8.9-5.9 NW29.91- 53.4- 50.9---
2025-06-13 04:00 pm NW 23.3 29.1----29.91-0.03 53.4- 50.9---
2025-06-13 03:50 pm NW 23.3 29.1 8.5 95.7 NW29.91- 53.4- 50.9---
2025-06-13 03:40 pm NW 23.3 31.1 8.5-5.7 NW29.91- 53.4- 50.5---
2025-06-13 03:30 pm NW 25.3 31.1----29.91- 53.4- 50.7---
2025-06-13 03:20 pm NW 23.3 31.1 8.5 85.8NNW29.92- 53.4- 50.9---
2025-06-13 03:10 pm NW 25.3 31.1----29.92- 53.4- 50.9---
2025-06-13 03:00 pm NW 23.3 29.1----29.92-0.03 53.2- 50.7---
2025-06-13 02:50 pm NW 25.3 31.1 9.2-6.0 NW29.94- 53.2- 50.7---
2025-06-13 02:40 pm NW 23.3 29.1----29.92- 53.2- 50.7---
2025-06-13 02:30 pm NW 23.3 31.1----29.92- 53.2- 50.9---
2025-06-13 02:20 pm NW 25.3 31.1 8.2 95.8 NW29.92- 53.2- 50.9---
2025-06-13 02:10 pm NW 23.3 29.1 8.2-5.8 NW29.92- 53.2- 50.9---
2025-06-13 02:00 pm NW 23.3 29.1----29.92-0.01 53.2- 50.9---
2025-06-13 01:50 pm NW 23.3 31.1 6.9 85.5 NW29.92- 53.2- 50.9---
2025-06-13 01:40 pm NW 23.3 29.1 6.9-5.5 NW29.93- 53.2- 50.9---
2025-06-13 01:30 pm NW 23.3 27.2----29.92- 53.2- 51.1---
2025-06-13 01:20 pm NW 21.4 27.2 7.2 95.8 NW29.93- 53.2- 51.3---
2025-06-13 01:10 pm NW 21.4 27.2----29.93- 53.1- 51.1---
2025-06-13 01:00 pm NW 21.4 27.2----29.93+0.00 53.1- 51.1---
2025-06-13 12:50 pm NW 19.4 25.3 6.9 85.7 NW29.93- 53.1- 51.1---
2025-06-13 12:40 pm NW 19.4 25.3 6.9-5.7 NW29.93- 52.9- 51.1---
2025-06-13 12:30 pm NW 19.4 23.3----29.93- 52.9- 51.1---
2025-06-13 12:20 pm NW 19.4 25.3 6.6-5.6 NW29.97- 52.9- 51.1---
2025-06-13 12:10 pm NW 17.5 21.4 6.6-5.6 NW29.95- 52.9- 51.1---
2025-06-13 12:00 pm NW 17.5 21.4----29.95+0.04 52.9- 51.1---
2025-06-13 11:50 am NW 17.5 21.4 7.2 85.7 NW29.94- 52.9- 51.1---
2025-06-13 11:40 am NW 17.5 21.4----29.94- 52.9- 51.1---
2025-06-13 11:30 am NW 19.4 23.3----29.94- 52.7- 50.9---
2025-06-13 11:20 am NW 17.5 23.3 7.2-5.7 NW29.94- 52.5- 50.9---
2025-06-13 11:10 am--- 7.2 85.7 NW--------
2025-06-13 11:00 am NW 17.5 21.4----29.93+0.03 52.2- 50.7---
2025-06-13 10:50 am NW 21.4 25.3 6.6 75.3 NW29.93- 51.8- 50.4---
2025-06-13 10:40 am NW 21.4 25.3----29.93- 52.0- 50.5---
2025-06-13 10:30 am NW 21.4 27.2----29.93- 52.0- 50.5---
2025-06-13 10:20 am NW 19.4 25.3 6.6 95.3 NW29.93- 52.2- 50.5---
2025-06-13 10:10 am NW 19.4 23.3 6.6-5.3 NW29.93- 52.2- 50.5---
2025-06-13 10:00 am NW 21.4 27.2----29.93+0.01 52.0- 50.4---
2025-06-13 09:50 am NW 19.4 27.2 6.6 65.1NNW29.93- 52.0- 50.5---
2025-06-13 09:40 am NW 21.4 25.3 6.6-5.1NNW29.93- 51.8- 50.4---
2025-06-13 09:30 am NW 21.4 27.2----29.92- 51.8- 50.4---
2025-06-13 09:20 am NW 21.4 27.2 7.5 65.4 NW29.92- 51.6- 50.2---
2025-06-13 09:10 am NW 21.4 29.1 7.5-5.4 NW29.92- 51.6- 50.2---
2025-06-13 09:00 am NW 21.4 29.1----29.92+0.00 51.8- 50.4---
2025-06-13 08:50 am NW 21.4 25.3 7.2 75.4 NW29.92- 51.6- 50.2---
2025-06-13 08:40 am NW 21.4 27.2----29.92- 51.4- 50.0---
2025-06-13 08:30 am NW 23.3 27.2----29.92- 51.4- 50.0---
2025-06-13 08:20 am NW 21.4 27.2 7.2 75.5 NW29.92- 51.4- 50.0---
2025-06-13 08:10 am NW 21.4 27.2 7.2-5.5 NW29.92- 51.4- 50.2---
2025-06-13 08:00 am NW 21.4 27.2----29.92+0.00 51.4- 50.2---
2025-06-13 07:50 am NW 21.4 25.3 6.6 85.2 NW29.92- 51.4- 50.0---
2025-06-13 07:40 am NW 21.4 29.1----29.92- 51.4- 50.0---
2025-06-13 07:30 am NW 19.4 27.2----29.92- 51.6- 50.4---
2025-06-13 07:20 am NW 17.5 21.4 7.2 75.5 NW29.93- 51.8- 50.5---
2025-06-13 07:10 am NW 19.4 27.2----29.93- 51.6- 50.2---
2025-06-13 07:00 am NW 19.4 25.3----29.93+0.00 51.6- 50.2---
2025-06-13 06:50 am NW 21.4 27.2 6.9 65.4 NW29.93- 51.4- 50.0---
2025-06-13 06:40 am NW 19.4 25.3----29.92- 51.6- 50.4---
2025-06-13 06:30 am NW 21.4 25.3----29.92- 51.4- 50.2---
2025-06-13 06:20 am NW 21.4 27.2 6.9 75.7 NW29.92- 51.3- 50.0---
2025-06-13 06:10 am NW 19.4 25.3 6.9-5.7 NW29.92- 51.4- 50.2---
2025-06-13 06:00 am NW 17.5 23.3----29.92+0.00 51.6- 50.4---
2025-06-13 05:50 am NW 19.4 25.3 6.2 75.4 NW29.92- 51.6- 50.4---
2025-06-13 05:40 am NW 19.4 25.3 6.2-5.4 NW29.92- 51.8- 50.5---
2025-06-13 05:30 am NW 19.4 25.3----29.92- 51.8- 50.5---
2025-06-13 05:20 am NW 19.4 25.3 6.6 75.4 NW29.92- 51.8- 50.5---
2025-06-13 05:10 am NW 19.4 23.3 6.6-5.4 NW29.92- 51.8- 50.5---
2025-06-13 05:00 am NW 19.4 25.3----29.92+0.00 51.8- 50.5---
2025-06-13 04:50 am NW 21.4 25.3 5.9 75.3 NW29.92- 51.8- 50.4---
2025-06-13 04:40 am NW 19.4 25.3----29.92- 51.8- 50.4---
2025-06-13 04:30 am NW 19.4 25.3----29.92- 51.8- 50.4---
2025-06-13 04:20 am NW 19.4 25.3 6.2 75.1 NW29.92- 52.0- 50.5---
2025-06-13 04:10 am NW 19.4 25.3 6.2-5.1 NW29.92- 52.0- 50.5---
2025-06-13 04:00 am NW 19.4 25.3----29.92+0.00 52.2- 50.7---
2025-06-13 03:50 am NW 21.4 25.3 6.2 75.3 NW29.92- 52.0- 50.5---
2025-06-13 03:40 am NW 21.4 27.2----29.92- 52.2- 50.7---
2025-06-13 03:30 am NW 21.4 27.2----29.91- 52.0- 50.5---
2025-06-13 03:20 am NW 21.4 25.3 6.9-5.3 NW29.91- 52.2- 50.7---
2025-06-13 03:10 am--- 6.9 75.3 NW--------
2025-06-13 03:00 am NW 19.4 23.3----29.92+0.00 52.2- 50.7---
2025-06-13 02:50 am NW 21.4 25.3 6.2 65.2 NW29.92- 52.2- 50.7---
2025-06-13 02:40 am NW 19.4 27.2----29.92- 52.2- 50.7---
2025-06-13 02:30 am NW 19.4 25.3----29.92- 52.2- 50.7---
2025-06-13 02:20 am NW 19.4 27.2 6.9 75.4 NW29.92- 52.2- 50.7---
2025-06-13 02:10 am NW 19.4 23.3----29.92- 52.3- 50.9---
2025-06-13 02:00 am NW 19.4 27.2----29.92+0.00 52.3- 50.9---
2025-06-13 01:50 am NW 21.4 27.2 6.2 75.2 NW29.92- 52.2- 50.7---
2025-06-13 01:40 am NW 21.4 27.2----29.92- 52.2- 50.7---
2025-06-13 01:30 am NW 23.3 29.1----29.92- 52.2- 50.5---
2025-06-13 01:20 am NW 21.4 27.2 6.2 75.1 NW29.92- 52.3- 50.7---
2025-06-13 01:10 am NW 19.4 25.3----29.92- 52.5- 50.7---
2025-06-13 01:00 am NW 21.4 27.2----29.92+0.01 52.5- 50.7---
2025-06-13 12:50 am NW 21.4 27.2 6.9 75.4 NW29.92- 52.7- 50.9---
2025-06-13 12:40 am NW 23.3 27.2----29.92- 52.5- 50.7---
2025-06-13 12:30 am NW 23.3 29.1----29.92- 52.7- 50.9---
2025-06-13 12:20 am NW 23.3 27.2 6.9 75.3 NW29.91- 52.7- 50.9---
2025-06-13 12:10 am NW 23.3 29.1----29.92- 52.5- 50.7---
2025-06-13 12:00 am NW 21.4 29.1----29.92+0.02 52.7- 50.9---
2025-06-12 11:50 pm NW 21.4 29.1 6.6 75.2 NW29.92- 52.7- 50.9---
2025-06-12 11:40 pm NW 21.4 29.1 6.6-5.2 NW29.92- 52.7- 50.9---
2025-06-12 11:30 pm NW 23.3 29.1----29.93- 52.7- 51.1---
2025-06-12 11:20 pm NW 23.3 33.0 7.2 75.4 NW29.92- 52.7- 51.3---
2025-06-12 11:10 pm NW 25.3 33.0----29.92- 52.5- 51.1---
2025-06-12 11:00 pm NW 25.3 33.0----29.92+0.02 52.7- 51.1---
2025-06-12 10:50 pm NW 27.2 35.0 7.9-5.6 NW29.94- 52.5- 50.9---
2025-06-12 10:40 pm NW 25.3 35.0----29.92- 52.5- 51.1---
2025-06-12 10:30 pm NW 25.3 31.1----29.91- 52.5- 51.1---
2025-06-12 10:20 pm NW 25.3 31.1 8.2 75.6 NW29.91- 52.5- 50.9---
2025-06-12 10:10 pm NW 23.3 29.1 8.2-5.6 NW29.91- 52.7- 51.1---
2025-06-12 10:00 pm NW 23.3 29.1----29.91+0.01 52.7- 50.9---
2025-06-12 09:50 pm NW 25.3 31.1 7.9 85.6 NW29.91- 52.9- 51.1---

Wave Summary
for 46013 as of
(9:40 pm PDT on 06/13/2025)
0440 GMT on 06/14/2025:

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): 8.5 ft
5-day plot - Swell Height Swell Height (SwH): 4.3 ft
5-day plot - Swell Period Swell Period (SwP): 9.1 sec
5-day plot - Swell Direction Swell Direction (SwD): NW
5-day plot - Wind Wave Height Wind Wave Height (WWH): 7.2 ft
5-day plot - Wind Wave Period Wind Wave Period (WWP): 7.7 sec
5-day plot - Wind Wave Direction Wind Wave Direction (WWD): NW
5-day plot - Wave Steepness Wave Steepness (STEEPNESS): AVERAGE
5-day plot - Average Wave Period Average Wave Period (APD): 5.9 sec
Previous observations
TIME
(PDT)
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
2025-06-13 09:10 pm 8.5 3.3 13.8 S 7.9 8.3 NW STEEP 5.8
2025-06-13 08:40 pm 8.5 3.0 12.1WSW 7.9 8.3 NW STEEP 5.7
2025-06-13 08:10 pm 8.5 3.6 14.8 W 7.5 8.3 NW STEEP 5.8
2025-06-13 07:40 pm 8.2 3.6 14.8SSW 7.5 8.3 NW STEEP 5.7
2025-06-13 07:10 pm 8.5 3.6 13.8WNW 7.9 7.7 NW STEEP 5.8
2025-06-13 06:40 pm 8.5 2.0 12.9WSW 8.2 6.7 NWVERY_STEEP 5.7
2025-06-13 06:10 pm 8.5 3.3 13.8SSW 7.9 8.3 NW STEEP 5.8
2025-06-13 05:40 pm 7.9 3.3 14.8 SW 7.2 6.7 NWVERY_STEEP 5.6
2025-06-13 05:10 pm 8.9 3.9 9.1NNW 7.9 7.1 NW AVERAGE 5.8
2025-06-13 04:40 pm 8.5 3.9 13.8 SW 7.5 8.3 NW STEEP 5.9
2025-06-13 04:10 pm 8.9 2.6 12.9SSE 8.5 6.2 NWVERY_STEEP 5.9
2025-06-13 03:40 pm 8.5 3.6 9.1 NW 7.9 6.7 NW AVERAGE 5.7
2025-06-13 03:10 pm 8.5 3.6 13.8 W 7.9 8.3 NNW STEEP 5.8
2025-06-13 02:40 pm 9.2 4.6 9.1 NW 8.2 5.9 NW AVERAGE 6.0
2025-06-13 02:10 pm 8.2 3.6 9.1 NW 7.2 7.1 NW AVERAGE 5.8
2025-06-13 01:40 pm 6.9 3.6 14.8 SW 5.9 7.7 NW STEEP 5.5
2025-06-13 01:10 pm 7.2 3.6 9.1 NW 6.2 7.7 NW AVERAGE 5.8
2025-06-13 12:40 pm 6.9 3.3 13.8 SW 6.2 8.3 NW AVERAGE 5.7
2025-06-13 12:10 pm 6.6 3.9 8.3 NW 5.6 6.7 NW AVERAGE 5.6
2025-06-13 11:40 am 7.2 3.9 14.8 W 6.2 7.7 NW STEEP 5.7
2025-06-13 11:10 am 7.2 3.9 8.3 NW 5.9 5.3 NW STEEP 5.7
2025-06-13 10:40 am 6.6 2.6 9.1 NW 6.2 7.1 NW STEEP 5.3
2025-06-13 10:10 am 6.6 3.3 9.1 NW 5.6 7.1 NW AVERAGE 5.3
2025-06-13 09:40 am 6.6 2.6 8.3 NW 6.2 5.9 NNWVERY_STEEP 5.1
2025-06-13 09:10 am 7.5 2.3 13.8WNW 7.2 5.9 NWVERY_STEEP 5.4
2025-06-13 08:40 am 7.2 2.3 14.8 S 6.9 7.1 NW STEEP 5.4
2025-06-13 08:10 am 7.2 3.0 13.8 NW 6.6 7.1 NW STEEP 5.5
2025-06-13 07:40 am 6.6 2.6 9.1 NW 6.2 7.7 NW STEEP 5.2
2025-06-13 07:10 am 7.2 2.6 14.8SSW 6.9 6.7 NWVERY_STEEP 5.5
2025-06-13 06:40 am 6.9 3.0 9.1 NW 6.2 6.2 NWVERY_STEEP 5.4
2025-06-13 06:10 am 6.9 2.0 14.8 NW 6.6 7.1 NW STEEP 5.7
2025-06-13 05:40 am 6.2 3.0 8.3 NW 5.6 6.7 NW STEEP 5.4
2025-06-13 05:10 am 6.6 2.3 10.0NNW 6.2 7.1 NW STEEP 5.4
2025-06-13 04:40 am 5.9 2.0 13.8 W 5.6 7.1 NW STEEP 5.3
2025-06-13 04:10 am 6.2 2.3 14.8 NE 5.6 6.7 NW STEEP 5.1
2025-06-13 03:40 am 6.2 2.0 10.0NNW 5.9 6.7 NW STEEP 5.3
2025-06-13 03:10 am 6.9 2.0 14.8 W 6.6 6.7 NW STEEP 5.3
2025-06-13 02:40 am 6.2 2.6 9.1 NW 5.9 6.2 NWVERY_STEEP 5.2
2025-06-13 02:10 am 6.9 2.6 13.8 SW 6.2 6.7 NW STEEP 5.4
2025-06-13 01:40 am 6.2 2.6 9.1 NW 5.9 7.1 NW STEEP 5.2
2025-06-13 01:10 am 6.2 2.3 14.8 S 5.9 7.1 NW STEEP 5.1
2025-06-13 12:40 am 6.9 2.6 14.8 SW 6.2 6.7 NW STEEP 5.4
2025-06-13 12:10 am 6.9 2.3 13.8WNW 6.2 7.1 NW STEEP 5.3
2025-06-12 11:40 pm 6.6 2.3 10.0 NW 6.2 7.1 NW STEEP 5.2
2025-06-12 11:10 pm 7.2 2.3 10.0 NW 6.9 7.1 NW STEEP 5.4
2025-06-12 10:40 pm 7.9 3.0 10.0 NW 7.5 7.1 NW STEEP 5.6
2025-06-12 10:10 pm 8.2 2.3 14.8 W 7.9 7.1 NW STEEP 5.6

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