Station 45007 (LLNR 20595) - SOUTH MICHIGAN - 43NM East Southeast of Milwaukee, WI Image indicating link to RSS feed of recent meteorological observations for station 45007


Conditions at 45007 as of
(10:10 am EDT)
1410 GMT on 06/16/2024:
     

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): SE ( 140 deg true )
5-day plot - Wind Speed Wind Speed (WSPD): 15.5 kts
5-day plot - Wind Gust Wind Gust (GST): 17.5 kts
5-day plot - Atmospheric Pressure Atmospheric Pressure (PRES):29.96 in
5-day plot - Air Temperature Air Temperature (ATMP): 62.8 °F
5-day plot - Water Temperature Water Temperature (WTMP): 59.0 °F
5-day plot - Dew Point Dew Point (DEWP): 56.7 °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): 17.5 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 (EDT)Pressure
10:10 am29.96 in
Highest 1-minute Wind Speed
Time (EDT)5-day plot - 1-Minute Wind Speed WSPD 5-day plot - 1-Minute Wind Direction WDIR
10:04 am 15.5 kts SE ( 140 deg true )
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
2024-06-16 10:00 am SE 15.5 19.4----29.96-0.01 63.1 59.0 56.5---
2024-06-16 09:50 am SE 15.5 17.5 3.3 53.9SSE29.97- 63.1 59.0 56.5---
2024-06-16 09:40 am SE 15.5 17.5 3.3-3.9SSE29.97- 63.1 59.0 56.3---
2024-06-16 09:30 amSSE 15.5 17.5----29.98- 63.0 59.0 56.3---
2024-06-16 09:20 amSSE 15.5 17.5 3.3-3.8 SE--------
2024-06-16 09:10 amSSE 15.5 19.4 3.3-3.8 SE29.98- 63.3 59.2 56.1---
2024-06-16 09:00 am SE 15.5 19.4----29.97-0.01 63.1 59.2 56.1---
2024-06-16 08:50 am SE 15.5 19.4 3.3 53.8SSE29.97- 63.0 59.2 55.9---
2024-06-16 08:40 am SE 15.5 21.4 3.3-3.8SSE29.97- 63.0 59.2 55.8---
2024-06-16 08:30 am SE 15.5 19.4----29.97- 63.0 59.2 55.6---
2024-06-16 08:20 am SE 15.5 19.4 3.0 53.7 SE29.97- 63.0- 55.8---
2024-06-16 08:10 am SE 17.5 19.4 3.0-3.7 SE29.97- 63.0 59.2 55.4---
2024-06-16 08:00 am SE 15.5 19.4----29.97+0.00 63.0 59.2 55.4---
2024-06-16 07:50 am SE 15.5 19.4 3.3 43.8 SE29.97- 62.8 59.2 55.6---
2024-06-16 07:40 am SE 15.5 17.5----29.97- 62.8 59.2 55.8---
2024-06-16 07:30 am SE 15.5 17.5----29.98- 62.8 59.2 55.8---
2024-06-16 07:20 am SE 15.5 17.5 3.0 53.6SSE29.98- 62.6 59.2 55.6---
2024-06-16 07:10 am SE 15.5 19.4 3.0-3.6SSE29.98- 62.6 59.2 55.6---
2024-06-16 07:00 am SE 15.5 17.5----29.97-0.01 62.8 59.2 55.6---
2024-06-16 06:50 am SE 15.5 17.5 3.0 43.7 SE29.98- 62.8 59.0 55.4---
2024-06-16 06:40 am SE 15.5 17.5 3.0-3.7 SE29.98- 62.8 59.0 55.4---
2024-06-16 06:30 am SE 15.5 17.5----29.98- 63.0 59.0 55.4---
2024-06-16 06:20 am SE 15.5 17.5 3.0 43.6 SE29.98- 63.0 59.0 55.6---
2024-06-16 06:10 am SE 15.5 15.5 3.0-3.6 SE29.98- 63.0 59.0 55.4---
2024-06-16 06:00 am SE 15.5 17.5----29.98-0.02 63.1 59.0 55.6---
2024-06-16 05:50 am SE 15.5 17.5 3.0 43.6 SE29.98- 63.1 59.0 55.4---
2024-06-16 05:40 am SE 15.5 17.5----29.98- 63.1 59.0 55.6---
2024-06-16 05:30 am SE 15.5 17.5----29.97- 63.1 59.0 55.6---
2024-06-16 05:20 am SE 15.5 19.4 2.6 43.4 SE29.97- 63.3 59.0 55.6---
2024-06-16 05:10 am SE 15.5 19.4 2.6-3.4 SE29.97- 63.3 59.0 55.4---
2024-06-16 05:00 am SE 15.5 17.5----29.97-0.04 63.3 59.0 55.6---
2024-06-16 04:50 am SE 15.5 17.5 2.6 43.3SSE29.98- 63.5- 55.6---
2024-06-16 04:40 am SE 15.5 17.5----29.98- 63.5 59.0 55.6---
2024-06-16 04:30 am SE 15.5 17.5----29.98- 63.5 59.2 55.8---
2024-06-16 04:20 am SE 15.5 17.5 2.6 43.3 SE29.98- 63.7- 55.8---
2024-06-16 04:10 am SE 15.5 19.4 2.6-3.3 SE29.98- 63.7 59.2 55.8---
2024-06-16 04:00 am SE 15.5 19.4----29.99-0.03 63.9 59.2 55.8---
2024-06-16 03:50 am SE 15.5 17.5 2.6 33.2 SE29.99- 63.9- 55.8---
2024-06-16 03:40 am SE 15.5 17.5 2.6-3.2 SE29.99- 64.0 59.2 55.9---
2024-06-16 03:30 am SE 15.5 17.5----29.99- 64.0 59.2 55.8---
2024-06-16 03:20 am SE 15.5 17.5 2.0 33.0 SE30.00- 64.4- 55.9---
2024-06-16 03:10 am SE 15.5 19.4 2.0-3.0 SE30.00- 64.6 59.2 55.9---
2024-06-16 03:00 am SE 15.5 17.5----30.01+0.00 64.4 59.4 56.3---
2024-06-16 02:50 am SE 15.5 17.5 1.6 32.8SSE30.01- 64.2- 56.7---
2024-06-16 02:40 am SE 15.5 17.5----30.01- 64.4 59.4 56.8---
2024-06-16 02:30 am SE 15.5 17.5----30.01- 64.4 59.4 57.0---
2024-06-16 02:20 am SE 15.5 17.5 1.6 32.7SSE30.01- 64.6 59.4 57.4---
2024-06-16 02:10 am SE 13.6 17.5----30.01- 64.0 59.4 57.9---
2024-06-16 02:00 am SE 13.6 17.5----30.01+0.00 64.6 59.5 57.6---
2024-06-16 01:50 am SE 15.5 17.5 1.6 32.7 SE30.01- 64.8- 57.7---
2024-06-16 01:40 am SE 13.6 15.5----30.01- 64.6 59.5 58.3---
2024-06-16 01:30 am SE 13.6 13.6----30.02- 64.6 59.5 58.3---
2024-06-16 01:20 am SE 13.6 15.5 1.3 32.6 SE30.02- 64.8 59.5 58.5---
2024-06-16 01:10 am SE 13.6 13.6----30.02- 64.8 59.5 58.3---
2024-06-16 01:00 am SE 11.7 13.6----30.02+0.01 64.8 59.7 58.5---
2024-06-16 12:50 am SE 11.7 13.6 1.3 22.5 SE30.01- 65.1- 58.5---
2024-06-16 12:40 am SE 13.6 13.6 1.3-2.5 SE30.01- 65.3 59.7 58.3---
2024-06-16 12:30 am SE 11.7 13.6----30.01- 64.9 59.7 58.5---
2024-06-16 12:20 am SE 11.7 13.6 1.0 32.5SSE30.01- 64.8 59.7 58.6---
2024-06-16 12:10 am SE 11.7 13.6 1.0-2.5SSE30.01- 64.9 59.7 58.8---
2024-06-16 12:00 am SE 11.7 13.6----30.01+0.02 64.9 59.7 59.0---
2024-06-15 11:50 pm SE 11.7 13.6 1.0 22.5 SE30.01- 64.8 59.7 59.0---
2024-06-15 11:40 pmESE 11.7 13.6 1.0-2.5 SE30.01- 64.9 59.7 59.2---
2024-06-15 11:30 pm SE 11.7 13.6----30.01- 65.5 59.7 59.2---
2024-06-15 11:20 pm SE 11.7 13.6 0.7-2.5-30.01- 65.5 59.7 59.0---
2024-06-15 11:10 pmESE 11.7 13.6----30.01- 64.8 59.7 59.4---
2024-06-15 11:00 pmESE 9.7 11.7----30.01+0.00 64.8 59.7 59.5---
2024-06-15 10:50 pm SE 9.7 11.7 0.7-2.5-30.01- 64.6 59.7 59.5---
2024-06-15 10:40 pm SE 9.7 9.7----30.01- 64.2 59.7 59.4---
2024-06-15 10:30 pm SE 9.7 9.7----30.01- 64.8 59.7 59.4---
2024-06-15 10:20 pm SE 9.7 9.7 0.7-2.6-30.01- 65.7- 58.8---
2024-06-15 10:10 pm SE 9.7 9.7 0.7-2.6-30.01- 66.2 59.7 58.5---
2024-06-15 10:00 pm SE 9.7 9.7----30.01-0.04 65.5 59.9 58.5---
2024-06-15 09:50 pmESE 7.8 9.7 0.7-2.5-30.01- 64.4 59.9 58.6---
2024-06-15 09:40 pmESE 7.8 9.7----30.01- 64.6 59.9 58.8---
2024-06-15 09:30 pm SE 7.8 7.8----30.01- 64.8 59.9 59.2---
2024-06-15 09:20 pmESE 7.8 9.7 0.7-2.5-30.01- 64.9 59.9 59.2---
2024-06-15 09:10 pmESE 9.7 11.7 0.7-2.5-29.99- 64.8 59.9 59.4---
2024-06-15 09:00 pmESE 11.7 11.7----29.98-0.09 65.1 59.9 59.4---
2024-06-15 08:50 pmESE 11.7 13.6 0.7-2.8-29.98- 65.3 59.9 59.2---
2024-06-15 08:40 pmESE 11.7 13.6----29.98- 65.3 59.9 59.2---
2024-06-15 08:30 pmESE 11.7 13.6----29.98- 65.1 59.9 59.2---
2024-06-15 08:20 pmESE 11.7 11.7 0.7-3.0-30.00- 64.9- 59.0---
2024-06-15 08:10 pmESE 11.7 11.7 0.7-3.0-30.01- 64.9 60.1 59.2---
2024-06-15 08:00 pmESE 9.7 11.7----30.01-0.07 64.9 60.1 59.4---
2024-06-15 07:50 pmESE 9.7 11.7 0.7-3.0-30.02- 64.9- 59.5---
2024-06-15 07:40 pmESE 9.7 9.7----30.03- 65.1 60.3 59.7---
2024-06-15 07:20 pmESE 9.7 9.7 0.7-2.9-30.04- 64.8 60.3 59.7---
2024-06-15 07:10 pmESE 7.8 9.7 0.7-2.9-30.04- 64.2 60.4 59.7---
2024-06-15 07:00 pmESE 7.8 7.8----30.05-0.05 64.6- 59.7---
2024-06-15 06:50 pmESE 7.8 7.8 0.7-2.9-30.05- 64.2 60.4 59.7---
2024-06-15 06:40 pmESE 7.8 7.8----30.06- 64.2 60.6 60.1---
2024-06-15 06:30 pmESE 5.8 7.8----30.06- 64.4- 60.1---
2024-06-15 06:20 pmESE 5.8 7.8 0.7-2.9-30.07- 64.2- 60.1---
2024-06-15 06:10 pmESE 5.8 7.8 0.7-2.9-30.07- 63.7 60.6 59.7---
2024-06-15 06:00 pm SE 3.9 7.8----30.07-0.05 63.9 60.6 59.5---
2024-06-15 05:50 pmESE 3.9 5.8 1.0 32.9SSE30.07- 63.5 60.6 59.7---
2024-06-15 05:40 pmESE 5.8 5.8----30.07- 63.5 60.6 59.4---
2024-06-15 05:30 pmESE 5.8 5.8----30.08- 63.1 60.4 59.5---
2024-06-15 05:20 pmESE 3.9 5.8 1.0 33.0SSE30.08- 63.3 60.4 59.5---
2024-06-15 05:10 pm SE 3.9 5.8----30.09- 63.3 60.3 59.2---
2024-06-15 05:00 pmESE 5.8 5.8----30.08-0.04 63.7 60.6 59.0---
2024-06-15 04:50 pm E 5.8 5.8 1.0 33.0ESE30.09- 63.3- 59.0---
2024-06-15 04:40 pm E 5.8 5.8----30.09- 63.5 59.9 59.0---
2024-06-15 04:30 pmESE 3.9 5.8----30.10- 63.3 60.1 59.0---
2024-06-15 04:20 pm E 5.8 5.8 1.0 42.9SSE30.10- 63.1 59.9 58.8---
2024-06-15 04:10 pm E 5.8 5.8 1.0-2.9SSE30.10- 63.3 60.1 58.6---
2024-06-15 04:00 pm E 5.8 5.8----30.11-0.03 63.1 59.9 58.5---
2024-06-15 03:50 pm E 5.8 5.8 1.0 33.0SSE30.11- 63.1 59.7 58.5---
2024-06-15 03:40 pm E 5.8 5.8----30.11- 63.0 59.7 58.6---
2024-06-15 03:30 pm E 5.8 5.8----30.11- 62.6 59.7 58.6---
2024-06-15 03:20 pm E 3.9 5.8 1.0 33.1SSE30.11- 62.4- 58.6---
2024-06-15 03:10 pm E 3.9 3.9 1.0-3.1SSE30.12- 62.2 59.7 58.5---
2024-06-15 03:00 pm E 3.9 3.9----30.12-0.02 62.4 59.7 58.5---
2024-06-15 02:50 pm E 3.9 3.9 1.0 33.0ESE30.13- 62.2 59.7 58.1---
2024-06-15 02:40 pm E 3.9 3.9----30.13- 62.4 59.5 57.9---
2024-06-15 02:30 pm E 3.9 5.8----30.13- 62.2 59.5 57.7---
2024-06-15 02:20 pm E 3.9 5.8 1.3 33.0ESE30.13- 62.2 59.5 57.9---
2024-06-15 02:10 pm E 5.8 5.8 1.3-3.0ESE30.13- 62.2 59.5 57.7---
2024-06-15 02:00 pm E 5.8 7.8----30.13-0.03 62.2 59.5 57.7---
2024-06-15 01:50 pmESE 5.8 7.8 1.3 32.9 E30.13- 62.2 59.5 57.6---
2024-06-15 01:40 pm E 5.8 7.8----30.13- 62.6 59.5 57.4---
2024-06-15 01:30 pm E 7.8 7.8----30.14- 62.6 59.4 57.2---
2024-06-15 01:20 pm E 7.8 9.7 1.3 33.0ENE30.14- 62.6 59.4 57.2---
2024-06-15 01:10 pm E 7.8 9.7 1.3-3.0ENE30.14- 62.4 59.4 57.4---
2024-06-15 01:00 pm E 7.8 9.7----30.14-0.02 62.4 59.4 57.4---
2024-06-15 12:50 pm E 9.7 11.7 1.0 33.0 NE30.13- 62.2- 57.4---
2024-06-15 12:40 pm E 9.7 11.7----30.13- 61.7 59.4 57.6---
2024-06-15 12:30 pm E 9.7 9.7----30.14- 61.5 59.2 58.1---
2024-06-15 12:20 pm E 7.8 9.7 1.0 32.9 NE30.14- 61.2- 58.1---
2024-06-15 12:10 pm E 7.8 9.7 1.0-2.9 NE30.14- 61.2 59.0 58.1---
2024-06-15 12:00 pm E 7.8 9.7----30.14-0.01 61.3 59.2 58.3---
2024-06-15 11:50 am E 9.7 9.7 1.0 32.9 NE30.14- 60.8 59.0 58.1---
2024-06-15 11:40 am E 7.8 9.7 1.0-2.9 NE30.15- 60.4 59.0 58.3---
2024-06-15 11:30 am E 7.8 7.8----30.16- 60.3 58.8 58.3---
2024-06-15 11:20 am E 5.8 7.8 1.0 32.9NNE30.16- 60.3- 58.3---
2024-06-15 11:10 am E 5.8 7.8 1.0-2.9NNE30.16- 60.1 58.8 58.1---
2024-06-15 11:00 am E 7.8 7.8----30.16+0.01 60.1 58.8 58.1---
2024-06-15 10:50 am E 5.8 7.8 1.0 32.9ENE30.16- 60.1- 58.1---
2024-06-15 10:40 am E 5.8 7.8 1.0-2.9ENE30.16- 60.1 58.8 57.9---
2024-06-15 10:30 am E 7.8 7.8----30.16- 59.9 58.6 57.7---
2024-06-15 10:20 am E 7.8 9.7 1.3 32.9NNE30.15- 59.9 58.6 57.7---
2024-06-15 10:10 am E 7.8 9.7 1.3-2.9NNE30.16- 59.9 58.6 57.7---
2024-06-15 10:00 am E 7.8 9.7----30.16+0.02 59.9 58.6 57.6---
2024-06-15 09:50 am E 9.7 9.7 1.3 32.9 NE30.16- 60.1 58.6 57.6---

Detailed Wave Summary
for 45007 as of (9:40 am EDT)
1340 GMT on 06/16/2024:

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): 3.3 ft
5-day plot - Swell Height Swell Height (SwH): 0.0 ft
5-day plot - Wind Wave Height Wind Wave Height (WWH): 3.3 ft
5-day plot - Wind Wave Period Wind Wave Period (WWP): 4.8 sec
5-day plot - Wind Wave Direction Wind Wave Direction (WWD):SSE
5-day plot - Wave Steepness Wave Steepness (STEEPNESS):VERY_STEEP
5-day plot - Average Wave Period Average Wave Period (APD): 3.9 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
2024-06-16 09:10 am 3.3 0.0-- 3.3 4.8 SEVERY_STEEP 3.8
2024-06-16 08:40 am 3.3 0.0-- 3.3 4.5 SSEVERY_STEEP 3.8
2024-06-16 08:10 am 3.0 0.0 7.7SSE 3.0 4.8 SEVERY_STEEP 3.7
2024-06-16 07:40 am 3.3 0.0 7.1 SE 3.3 4.3 SEVERY_STEEP 3.8
2024-06-16 07:10 am 3.0 0.0 7.7 NW 3.0 4.5 SSEVERY_STEEP 3.6
2024-06-16 06:40 am 3.0 0.0-- 3.0 4.3 SEVERY_STEEP 3.7
2024-06-16 06:10 am 3.0 0.0 10.0 SE 3.0 4.2 SEVERY_STEEP 3.6
2024-06-16 05:40 am 3.0 0.0-- 3.0 4.2 SEVERY_STEEP 3.6
2024-06-16 05:10 am 2.6 0.0-- 2.6 4.2 SEVERY_STEEP 3.4
2024-06-16 04:40 am 2.6 0.0 9.1 SE 2.6 3.6 SSEVERY_STEEP 3.3
2024-06-16 04:10 am 2.6 0.0 9.1WNW 2.6 3.6 SEVERY_STEEP 3.3
2024-06-16 03:40 am 2.6 0.0 7.1ESE 2.3 3.4 SE N/A 3.2
2024-06-16 03:10 am 2.0 0.0 7.1SSE 2.0 3.2 SE N/A 3.0
2024-06-16 02:40 am 1.6 0.0 6.2 SE 1.6 2.9 SSE N/A 2.8
2024-06-16 02:10 am 1.6 0.0 7.1WSW 1.6 2.9 SSE N/A 2.7
2024-06-16 01:40 am 1.6 0.0 5.6 SE 1.6 2.9 SE N/A 2.7
2024-06-16 01:10 am 1.3 0.0 6.7 SE 1.3 2.7 SE N/A 2.6
2024-06-16 12:40 am 1.3 0.0-- 1.3 2.5 SE N/A 2.5
2024-06-16 12:10 am 1.0 0.0 6.2 SE 1.0 2.6 SSE N/A 2.5
2024-06-15 11:40 pm 1.0 0.0 10.0 SE 1.0 2.4 SE N/A 2.5
2024-06-15 11:10 pm 0.7------ N/A 2.5
2024-06-15 10:40 pm 0.7------ N/A 2.5
2024-06-15 10:10 pm 0.7------ N/A 2.6
2024-06-15 09:40 pm 0.7------ N/A 2.5
2024-06-15 09:10 pm 0.7------ N/A 2.5
2024-06-15 08:40 pm 0.7------ N/A 2.8
2024-06-15 08:10 pm 0.7------ N/A 3.0
2024-06-15 07:40 pm 0.7------ N/A 3.0
2024-06-15 07:10 pm 0.7------ N/A 2.9
2024-06-15 06:40 pm 0.7------ N/A 2.9
2024-06-15 06:10 pm 0.7------ N/A 2.9
2024-06-15 05:40 pm 1.0 0.3 4.3SSW 0.7 3.4 SSE N/A 2.9
2024-06-15 05:10 pm 1.0 0.3 4.3 S 1.0 3.3 SSE N/A 3.0
2024-06-15 04:40 pm 1.0 0.3 4.5 S 1.0 2.9 ESE N/A 3.0
2024-06-15 04:10 pm 1.0 0.3 4.5 S 1.0 3.6 SSE N/A 2.9
2024-06-15 03:40 pm 1.0 0.3 4.5 S 1.0 3.4 SSE N/A 3.0
2024-06-15 03:10 pm 1.0 0.3 4.5 S 1.0 3.4 SSE N/A 3.1
2024-06-15 02:40 pm 1.0 0.3 4.2 S 1.0 3.3 ESE N/A 3.0
2024-06-15 02:10 pm 1.3 0.3 4.5SSW 1.3 3.0 ESE N/A 3.0
2024-06-15 01:40 pm 1.3 0.3 4.5 S 1.3 3.2 E N/A 2.9
2024-06-15 01:10 pm 1.3 0.3 4.3SSW 1.0 3.1 ENE N/A 3.0
2024-06-15 12:40 pm 1.0 0.0 5.9- 1.0 3.2 NE N/A 3.0
2024-06-15 12:10 pm 1.0 0.3 4.8SSW 1.0 3.1 NE N/A 2.9
2024-06-15 11:40 am 1.0 0.3 4.8SSW 1.0 2.9 NE N/A 2.9
2024-06-15 11:10 am 1.0 0.3 4.8SSW 1.0 3.2 NNE N/A 2.9
2024-06-15 10:40 am 1.0 0.3 5.0SSW 1.0 2.7 ENE N/A 2.9
2024-06-15 10:10 am 1.3 0.3 5.0 S 1.0 3.2 NNE N/A 2.9

Plot of wave energy versus frequency (and period)