Station 45005 (LLNR 5555) - WEST ERIE - 16 NM NW of Lorain, OH Image indicating link to RSS feed of recent meteorological observations for station 45005


Conditions at 45005 as of
(11:10 am EDT)
1510 GMT on 07/16/2024:
     

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): W ( 280 deg true )
5-day plot - Wind Speed Wind Speed (WSPD): 13.6 kts
5-day plot - Wind Gust Wind Gust (GST): 15.5 kts
5-day plot - Atmospheric Pressure Atmospheric Pressure (PRES):29.81 in
5-day plot - Air Temperature Air Temperature (ATMP): 73.8 °F
5-day plot - Water Temperature Water Temperature (WTMP): 74.8 °F
5-day plot - Dew Point Dew Point (DEWP): 68.7 °F
5-day plot - Wind Speed at 10 Meters Wind Speed at 10 meters (WSPD10M): 15.5 kts
5-day plot - Wind Speed at 20 Meters Wind Speed at 20 meters (WSPD20M): 15.5 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
11:01 am 15.5 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
2024-07-16 11:00 amWNW 15.5 17.5----29.80+0.11 73.6 74.8 68.7---
2024-07-16 10:50 am W 15.5 19.4 3.9 53.8 W29.80- 73.6 74.8 68.7---
2024-07-16 10:40 amWNW 17.5 21.4----29.79- 73.6 74.8 68.4---
2024-07-16 10:30 am W 19.4 23.3----29.79- 73.6 74.8 68.2---
2024-07-16 10:20 am W 19.4 23.3 4.6 54.1 W29.79- 73.6 74.7 68.0---
2024-07-16 10:10 am W 19.4 23.3 4.6-4.1 W29.79- 73.6 74.7 68.2---
2024-07-16 10:00 am W 21.4 25.3----29.79+0.11 73.6 74.7 68.4---
2024-07-16 09:50 am W 21.4 27.2 4.9 54.1WNW29.78- 73.6 74.7 68.4---
2024-07-16 09:40 am W 23.3 29.1----29.78- 73.4 74.8 68.4---
2024-07-16 09:30 am W 23.3 29.1----29.78- 73.4 74.8 68.7---
2024-07-16 09:20 am W 25.3 31.1 4.9 54.1 W29.78- 73.4 74.8 68.5---
2024-07-16 09:10 am W 25.3 33.0----29.77- 72.9 74.8 68.5---
2024-07-16 09:00 am W 27.2 35.0----29.76+0.10 73.6 74.8 68.9---
2024-07-16 08:50 am W 27.2 36.9 4.9 54.0WSW29.75- 73.6 74.8 68.9---
2024-07-16 08:40 am W 29.1 36.9----29.73- 73.4 74.8 68.4---
2024-07-16 08:30 am W 29.1 35.0----29.72- 73.4 74.8 68.5---
2024-07-16 08:20 am W 27.2 35.0 4.3 43.7WSW29.72- 73.4 75.0 68.5---
2024-07-16 08:10 am W 29.1 36.9 4.3-3.7WSW29.71- 73.6 74.8 68.2---
2024-07-16 08:00 am W 27.2 35.0----29.70+0.06 73.6 74.8 68.5---
2024-07-16 07:50 amWSW 27.2 33.0 3.6 43.7WSW29.70- 73.8 74.8 68.7---
2024-07-16 07:40 amWSW 25.3 31.1----29.69- 73.9 74.8 68.5---
2024-07-16 07:30 amWSW 21.4 29.1----29.68- 74.1 74.8 68.4---
2024-07-16 07:20 amWSW 21.4 27.2 3.3 43.5WSW29.68- 74.5 74.8 68.7---
2024-07-16 07:10 amWSW 21.4 27.2 3.3-3.5WSW29.68- 74.8 74.8 68.5---
2024-07-16 07:00 amWSW 21.4 27.2----29.68+0.01 75.4 75.0 68.2---
2024-07-16 06:50 amWSW 19.4 25.3 3.3 43.4 SW29.67- 75.6 75.0 68.5---
2024-07-16 06:40 amWSW 21.4 27.2----29.67- 76.5 75.0 67.8---
2024-07-16 06:30 amWSW 23.3 29.1----29.67- 77.0 75.0 67.5---
2024-07-16 06:20 amWSW 21.4 27.2 2.6 43.3SSW29.66- 77.5 75.0 67.8---
2024-07-16 06:10 amWSW 17.5 23.3----29.66- 77.9 75.2 68.5---
2024-07-16 06:00 amWSW 21.4 27.2----29.66-0.04 78.6 75.2 67.6---
2024-07-16 05:50 amWSW 19.4 27.2 2.3 43.2SSW29.66- 79.2 75.2 68.0---
2024-07-16 05:40 am SW 17.5 23.3----29.66- 79.2 75.2 69.4---
2024-07-16 05:30 am SW 17.5 23.3----29.66- 78.8 75.2 71.1---
2024-07-16 05:20 amSSW 17.5 29.1 2.3 33.3SSW29.66- 78.3 75.2 72.5---
2024-07-16 05:10 amSSW 15.5 17.5 2.3-3.3SSW29.65- 78.1 75.2 73.0---
2024-07-16 05:00 am S 15.5 17.5----29.64-0.11 77.9 75.2 73.4---
2024-07-16 04:50 am S 15.5 19.4 2.3 43.2SSW29.62- 77.9 75.2 73.4---
2024-07-16 04:40 am S 15.5 19.4----29.63- 77.9 75.2 73.6---
2024-07-16 04:30 am S 13.6 17.5----29.64- 77.9 75.2 73.6---
2024-07-16 04:20 amSSW 15.5 17.5 2.3 43.2SSW29.65- 78.1 75.2 73.6---
2024-07-16 04:10 amSSW 15.5 19.4----29.66- 78.1 75.2 73.4---
2024-07-16 04:00 amSSW 15.5 19.4----29.66-0.10 78.3 75.2 73.4---
2024-07-16 03:50 amSSW 15.5 21.4 2.3 33.1SSW29.67- 78.4 75.2 73.2---
2024-07-16 03:40 amSSW 19.4 21.4----29.67- 78.6 75.4 73.2---
2024-07-16 03:30 amSSW 19.4 25.3----29.68- 78.4 75.4 73.2---
2024-07-16 03:20 amSSW 21.4 25.3 1.6 33.0SSW29.68- 78.1 75.6 72.9---
2024-07-16 03:10 amSSW 17.5 21.4 1.6-3.0SSW29.68- 78.3 75.6 72.7---
2024-07-16 03:00 am S 13.6 19.4----29.69-0.07 77.7 75.7 73.0---
2024-07-16 02:50 am S 15.5 17.5 1.6 32.9SSW29.70- 77.4 75.7 72.7---
2024-07-16 02:40 amSSW 13.6 17.5 1.6-2.9SSW29.72- 77.4 75.7 72.7---
2024-07-16 02:30 amSSW 13.6 17.5----29.73- 77.4 75.7 72.5---
2024-07-16 02:20 amSSW 13.6 17.5 1.0 22.7NNE29.73- 77.5 75.7 72.5---
2024-07-16 02:10 amSSW 13.6 17.5 1.0-2.7NNE29.74- 77.5 75.7 72.7---
2024-07-16 02:00 amSSW 13.6 17.5----29.74-0.02 77.5 75.9 72.9---
2024-07-16 01:50 amSSW 11.7 15.5 1.0 22.8NNE29.75- 77.7 75.9 73.0---
2024-07-16 01:40 amSSW 9.7 13.6----29.75- 77.4 75.9 73.8---
2024-07-16 01:30 am S 11.7 13.6----29.75- 77.7 75.9 73.6---
2024-07-16 01:20 amSSW 11.7 15.5 0.7-3.1-29.77- 77.7 75.9 73.4---
2024-07-16 01:10 am S 11.7 13.6 0.7-3.1-29.76- 77.5 75.9 73.8---
2024-07-16 01:00 am S 11.7 13.6----29.77-0.01 77.7 76.1 73.9---
2024-07-16 12:50 am S 11.7 13.6 0.3-2.6-29.77- 77.9 76.1 73.9---
2024-07-16 12:40 am S 11.7 13.6----29.78- 77.9 76.3 73.9---
2024-07-16 12:30 am S 9.7 13.6----29.78- 78.1 76.3 74.1---
2024-07-16 12:20 am S 7.8 9.7 0.3-2.9-29.77- 78.1 76.3 74.3---
2024-07-16 12:10 am S 7.8 9.7 0.3-2.9-29.76- 78.4 76.3 73.9---
2024-07-16 12:00 am S 9.7 11.7----29.76-0.01 78.6 76.3 73.9---
2024-07-15 11:50 pm S 9.7 9.7 0.3-2.8-29.75- 78.1 76.3 74.1---
2024-07-15 11:40 pmSSE 7.8 9.7 0.3-2.8-29.75- 77.9 76.3 74.7---
2024-07-15 11:30 pmSSE 7.8 7.8----29.75- 77.7 76.3 74.7---
2024-07-15 11:20 pmSSE 5.8 7.8 0.3-3.1-29.76- 77.9 76.3 74.8---
2024-07-15 11:10 pmSSE 5.8 7.8 0.3-3.1-29.76- 77.9 76.1 74.8---
2024-07-15 11:00 pmSSE 5.8 7.8----29.77-0.03 77.7 76.1 75.0---
2024-07-15 10:50 pmSSE 5.8 5.8 0.3-3.1-29.78- 77.5 76.1 75.2---
2024-07-15 10:40 pm S 5.8 5.8 0.3-3.1-29.78- 77.5 76.1 75.4---
2024-07-15 10:30 pm S 5.8 5.8----29.78- 77.5 76.1 75.4---
2024-07-15 10:20 pmSSE 3.9 5.8 0.3-3.1-29.78- 77.4 76.1 75.4---
2024-07-15 10:10 pmSSE 3.9 5.8----29.78- 77.4 76.1 75.2---
2024-07-15 10:00 pmSSE 3.9 5.8----29.78-0.02 77.7 76.1 74.8---
2024-07-15 09:50 pmSSE 3.9 5.8 0.3-3.1-29.77- 77.7 76.1 74.7---
2024-07-15 09:40 pmSSE 5.8 7.8 0.3-3.1-29.77- 77.5 76.3 74.5---
2024-07-15 09:30 pmSSE 5.8 7.8----29.77- 77.7 76.3 74.1---
2024-07-15 09:20 pm SE 5.8 7.8 0.3-3.3-29.76- 77.4 76.3 74.3---
2024-07-15 09:10 pm SE 5.8 7.8 0.3-3.3-29.77- 77.2 76.3 74.3---
2024-07-15 09:00 pm SE 5.8 5.8----29.77-0.04 77.0 76.5 74.1---
2024-07-15 08:50 pm SE 3.9 5.8 1.3 166.3WSW29.78- 76.8 76.5 74.5---
2024-07-15 08:40 pm SE 3.9 5.8----29.78- 77.0 76.5 74.3---
2024-07-15 08:30 pmESE 3.9 5.8----29.78- 77.0 76.5 74.1---
2024-07-15 08:20 pmESE 3.9 5.8 0.7-3.1-29.78- 77.0 76.5 73.9---
2024-07-15 08:10 pmESE 3.9 5.8 0.7-3.1-29.79- 77.0 76.5 73.8---
2024-07-15 08:00 pm SE 3.9 5.8----29.79-0.03 77.0 76.3 73.8---
2024-07-15 07:50 pm SE 5.8 5.8 0.7-3.5-29.80- 77.2 76.3 73.8---
2024-07-15 07:40 pm SE 5.8 7.8----29.79- 77.2 76.1 73.4---
2024-07-15 07:30 pm SE 3.9 5.8----29.80- 77.4 76.1 73.4---
2024-07-15 07:20 pm SE 3.9 3.9 0.7-3.1-29.80- 77.4 76.1 73.0---
2024-07-15 07:10 pm SE 3.9 3.9 0.7-3.1-29.80- 77.4 76.1 72.7---
2024-07-15 07:00 pm SE 3.9 3.9----29.80-0.05 77.5 76.1 72.1---
2024-07-15 06:50 pm SE 3.9 5.8 0.7-3.2-29.80- 77.9 75.9 72.0---
2024-07-15 06:40 pm SE 1.9 3.9----29.81- 77.9 75.9 71.4---
2024-07-15 06:30 pmSSE 1.9 3.9----29.81- 78.3 75.9 71.2---
2024-07-15 06:20 pm- 0.0 1.9 1.0 33.0 W29.81- 78.4 75.7 71.1---
2024-07-15 06:10 pm SE 1.9 1.9 1.0-3.0 W29.81- 78.4 75.9 71.1---
2024-07-15 06:00 pm SE 1.9 3.9----29.81-0.05 78.1 75.9 71.2---
2024-07-15 05:50 pm- 0.0 1.9 1.0 33.0 W29.81- 78.6 75.7 71.8---
2024-07-15 05:40 pm- 0.0 1.9 1.0-3.0 W29.81- 78.1 75.9 71.8---
2024-07-15 05:30 pm- 0.0 1.9----29.81- 78.3 75.7 71.6---
2024-07-15 05:20 pm- 0.0 1.9 1.3 33.1WNW29.82- 77.9 75.9 71.4---
2024-07-15 05:10 pm- 0.0 1.9 1.3-3.1WNW29.83- 77.5 75.7 71.8---
2024-07-15 05:00 pm- 0.0 1.9----29.83-0.04 77.7 75.7 72.3---
2024-07-15 04:50 pm W 1.9 1.9 1.3 33.1WNW29.83- 77.4 75.7 71.8---
2024-07-15 04:40 pm W 3.9 3.9----29.83- 76.8 75.7 71.4---
2024-07-15 04:30 pm W 3.9 5.8----29.84- 76.8 75.7 71.6---
2024-07-15 04:20 pm W 5.8 7.8 1.6 33.2WNW29.84- 76.6 75.7 71.2---
2024-07-15 04:10 pm W 5.8 7.8 1.6-3.2WNW29.85- 76.6 75.6 71.1---
2024-07-15 04:00 pm W 5.8 7.8----29.85-0.01 76.5 75.6 71.1---
2024-07-15 03:50 pm W 7.8 7.8 1.6 43.3 W29.86- 76.5 75.6 70.9---
2024-07-15 03:40 pm W 9.7 11.7 1.6-3.3 W29.86- 76.3 75.6 70.3---
2024-07-15 03:30 pm W 9.7 11.7----29.86- 76.3 75.4 70.2---
2024-07-15 03:20 pm W 9.7 13.6 2.3 33.5 W29.86- 76.3 75.4 70.0---
2024-07-15 03:10 pm W 11.7 13.6 2.3-3.5 W29.87- 76.3 75.4 70.0---
2024-07-15 03:00 pm W 9.7 11.7----29.87+0.01 76.1 75.4 70.2---
2024-07-15 02:50 pm W 11.7 15.5 2.6 43.4 W29.87- 76.1 75.2 69.3---
2024-07-15 02:40 pm W 11.7 13.6 2.6-3.4 W29.87- 75.9 75.2 69.3---
2024-07-15 02:30 pm W 13.6 17.5----29.87- 75.7 75.2 68.9---
2024-07-15 02:20 pm W 13.6 15.5 2.6 43.4 W29.87- 75.7 75.0 69.3---
2024-07-15 02:10 pm W 15.5 17.5 2.6-3.4 W29.87- 75.6 75.0 68.5---
2024-07-15 02:00 pm W 15.5 19.4----29.87+0.02 75.6 75.0 68.7---
2024-07-15 01:50 pm W 17.5 19.4 2.6 43.5WSW29.86- 75.6 75.0 68.7---
2024-07-15 01:40 pm W 17.5 21.4----29.87- 75.6 75.0 68.7---
2024-07-15 01:30 pm W 17.5 21.4----29.87- 75.7 75.0 68.2---
2024-07-15 01:20 pm W 17.5 21.4 3.0 43.5 W29.87- 75.6 75.0 68.4---
2024-07-15 01:10 pm W 17.5 23.3----29.87- 75.6 75.0 68.2---
2024-07-15 01:00 pm W 15.5 21.4----29.86+0.01 75.7 75.0 68.7---
2024-07-15 12:50 pm W 19.4 23.3 3.0 43.4WSW29.86- 75.7 75.2 68.7---
2024-07-15 12:40 pmWSW 17.5 23.3 3.0-3.4WSW29.87- 75.7 75.0 69.1---
2024-07-15 12:30 pmWSW 17.5 21.4----29.86- 75.7 75.0 68.9---
2024-07-15 12:20 pm W 17.5 21.4 2.6 43.3WSW29.86- 75.6 75.0 68.5---
2024-07-15 12:10 pm W 17.5 21.4 2.6-3.3WSW29.86- 75.6 75.0 68.9---
2024-07-15 12:00 pm W 19.4 23.3----29.86-0.01 75.7 75.0 68.4---
2024-07-15 11:50 amWSW 17.5 21.4 2.3 33.3 SW29.85- 75.7 75.0 67.8---
2024-07-15 11:40 am W 15.5 19.4----29.85- 75.7 75.2 68.2---
2024-07-15 11:30 am W 17.5 21.4----29.85- 76.1 75.0 68.4---
2024-07-15 11:20 am W 17.5 21.4 3.0 194.4 SW29.85- 76.3 75.0 68.7---
2024-07-15 11:10 amWSW 17.5 21.4 3.0-4.4 SW29.85- 76.5 75.0 69.8---
2024-07-15 11:00 amWSW 15.5 19.4----29.84-0.01 76.6 75.0 70.5---
2024-07-15 10:50 amWSW 17.5 21.4 2.0 43.2 SW29.84- 76.8 75.0 70.7---

Detailed Wave Summary
for 45005 as of (10:40 am EDT)
1440 GMT on 07/16/2024:

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): 3.9 ft
5-day plot - Swell Height Swell Height (SwH): 0.0 ft
5-day plot - Wind Wave Height Wind Wave Height (WWH): 3.9 ft
5-day plot - Wind Wave Period Wind Wave Period (WWP): 4.8 sec
5-day plot - Wind Wave Direction Wind Wave Direction (WWD): W
5-day plot - Wave Steepness Wave Steepness (STEEPNESS):VERY_STEEP
5-day plot - Average Wave Period Average Wave Period (APD): 3.8 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
2024-07-16 10:10 am 4.6 0.3 8.3NNW 4.6 5.3 WVERY_STEEP 4.1
2024-07-16 09:40 am 4.9 0.0-- 4.9 5.0 WNWVERY_STEEP 4.1
2024-07-16 09:10 am 4.9 0.0-- 4.9 5.0 WVERY_STEEP 4.1
2024-07-16 08:40 am 4.9 0.7 8.3 S 4.9 4.5 WSWVERY_STEEP 4.0
2024-07-16 08:10 am 4.3 0.0-- 4.3 4.2 WSWVERY_STEEP 3.7
2024-07-16 07:40 am 3.6 0.0 7.7WSW 3.6 4.2 WSWVERY_STEEP 3.7
2024-07-16 07:10 am 3.3 0.3 7.7WSW 3.3 4.3 WSWVERY_STEEP 3.5
2024-07-16 06:40 am 3.3 0.0-- 3.3 3.6 SWVERY_STEEP 3.4
2024-07-16 06:10 am 2.6 0.7 9.1WNW 2.6 3.7 SSW N/A 3.3
2024-07-16 05:40 am 2.3 0.3 6.7 S 2.3 3.6 SSW N/A 3.2
2024-07-16 05:10 am 2.3 0.3 6.2NNE 2.3 3.4 SSW N/A 3.3
2024-07-16 04:40 am 2.3 0.3 7.1WSW 2.0 3.7 SSW N/A 3.2
2024-07-16 04:10 am 2.3 0.3 7.1 W 2.3 3.6 SSW N/A 3.2
2024-07-16 03:40 am 2.3 0.3 6.7 SE 2.3 3.3 SSW N/A 3.1
2024-07-16 03:10 am 1.6 0.3 7.7 S 1.6 2.9 SSW N/A 3.0
2024-07-16 02:40 am 1.6 0.7 9.1WSW 1.3 2.7 SSW N/A 2.9
2024-07-16 02:10 am 1.0 0.3 5.9 SW 1.0 2.4 NNE N/A 2.7
2024-07-16 01:40 am 1.0 0.3 6.7SSE 0.7 2.2 NNE N/A 2.8
2024-07-16 01:10 am 0.7------ N/A 3.1
2024-07-16 12:40 am 0.3------ N/A 2.6
2024-07-16 12:10 am 0.3------ N/A 2.9
2024-07-15 11:40 pm 0.3------ N/A 2.8
2024-07-15 11:10 pm 0.3------ N/A 3.1
2024-07-15 10:40 pm 0.3------ N/A 3.1
2024-07-15 10:10 pm 0.3------ N/A 3.1
2024-07-15 09:40 pm 0.3------ N/A 3.1
2024-07-15 09:10 pm 0.3------ N/A 3.3
2024-07-15 08:40 pm 1.3 1.0 16.0WSW 0.3 3.7 SSE N/A 6.3
2024-07-15 08:10 pm 0.7------ N/A 3.1
2024-07-15 07:40 pm 0.7------ N/A 3.5
2024-07-15 07:10 pm 0.7------ N/A 3.1
2024-07-15 06:40 pm 0.7------ N/A 3.2
2024-07-15 06:10 pm 1.0 0.3 10.0ESE 0.7 2.9 W N/A 3.0
2024-07-15 05:40 pm 1.0 0.3 5.6 SW 1.0 3.0 W N/A 3.0
2024-07-15 05:10 pm 1.3 0.7 5.6 NW 1.0 2.9 WNW N/A 3.1
2024-07-15 04:40 pm 1.3 0.7 5.3SSE 1.0 2.9 WNW N/A 3.1
2024-07-15 04:10 pm 1.6 0.7 4.3WNW 1.3 3.2 WNW N/A 3.2
2024-07-15 03:40 pm 1.6 0.7 6.2 W 1.6 3.6 W N/A 3.3
2024-07-15 03:10 pm 2.3 1.0 7.7ENE 2.0 3.4 W N/A 3.5
2024-07-15 02:40 pm 2.6 0.0-- 2.6 4.2 W N/A 3.4
2024-07-15 02:10 pm 2.6 0.0-- 2.6 4.0 W N/A 3.4
2024-07-15 01:40 pm 2.6 0.3 6.7ENE 2.6 4.0 WSWVERY_STEEP 3.5
2024-07-15 01:10 pm 3.0 0.3 10.0 W 3.0 3.8 WVERY_STEEP 3.5
2024-07-15 12:40 pm 3.0 0.3 6.7ENE 3.0 3.8 WSWVERY_STEEP 3.4
2024-07-15 12:10 pm 2.6 0.3 6.2WSW 2.6 3.7 WSW N/A 3.3
2024-07-15 11:40 am 2.3 1.0 6.7SSW 2.3 3.2 SW N/A 3.3
2024-07-15 11:10 am 3.0 2.0 19.0 SW 2.0 3.2 SSW SWELL 4.4

Plot of wave energy versus frequency (and period)