Station 41049 - SOUTH BERMUDA - 300 NM SSE of Bermuda Image indicating link to RSS feed of recent meteorological observations for station 41049


Conditions at 41049 as of
2210 GMT on 01/05/2026:
     

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):NNE ( 30 deg true )
5-day plot - Wind Speed Wind Speed (WSPD): 15.5 kts
5-day plot - Wind Gust Wind Gust (GST): 21.4 kts
5-day plot - Wave Height Wave Height (WVHT): 7.5 ft
5-day plot - Average Wave Period Average Period (APD): 5.9 sec
5-day plot - Mean Wave Direction Mean Wave Direction (MWD): N ( 358 deg true )
5-day plot - Atmospheric Pressure Atmospheric Pressure (PRES):30.00 in
5-day plot - Air Temperature Air Temperature (ATMP): 69.8 °F
5-day plot - Water Temperature Water Temperature (WTMP): 76.3 °F
5-day plot - Dew Point Dew Point (DEWP): 64.0 °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 (GMT)Pressure
221030.00 in
Highest 1-minute Wind Speed
Time (GMT)5-day plot - 1-Minute Wind Speed WSPD 5-day plot - 1-Minute Wind Direction WDIR
2201 19.4 ktsNNE ( 30 deg true )
Previous observations
TIME
(GMT)
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
2026-01-05 2200 NE 15.5 21.4----29.99+0.02 68.9 76.3 64.4---
2026-01-05 2150 NE 15.5 21.4 6.9 75.9 NW29.99- 69.1 76.3 65.1---
2026-01-05 2140 NE 17.5 21.4----29.99- 69.8 76.3 64.9---
2026-01-05 2130ENE 13.6 19.4----29.98- 68.9 76.3 65.7---
2026-01-05 2120 NE 17.5 21.4 7.2 85.8 NW29.99- 69.1 76.3 65.7---
2026-01-05 2110 NE 17.5 21.4 7.2-5.8 NW29.99- 69.8 76.3 65.1---
2026-01-05 2100NNE 15.5 19.4----29.98+0.03 70.0 76.3 64.9---
2026-01-05 2050 NE 15.5 21.4 6.9 85.8WNW29.98- 69.4 76.1 65.3---
2026-01-05 2040 NE 17.5 23.3----29.98- 70.2 76.1 65.5---
2026-01-05 2030 NE 17.5 21.4----29.98- 70.3 76.1 65.5---
2026-01-05 2020NNE 17.5 23.3 7.2 85.7 NW29.98- 70.5 76.1 65.7---
2026-01-05 2010 NE 17.5 23.3 7.2-5.7 NW29.98- 70.2 76.1 65.7---
2026-01-05 2000NNE 17.5 21.4----29.98+0.02 70.2 76.1 65.7---
2026-01-05 1950NNE 19.4 23.3 7.2 75.8 NW29.97- 69.8 76.1 65.5---
2026-01-05 1940NNE 19.4 21.4 7.2-5.8 NW29.97- 69.4 76.1 66.2---
2026-01-05 1930NNE 19.4 23.3----29.97- 68.9 76.1 66.0---
2026-01-05 1920NNE 21.4 25.3 7.2 85.9 NW29.97- 68.9- 66.0---
2026-01-05 1910NNE 21.4 25.3 7.2-5.9 NW29.97- 68.4 76.1 66.2---
2026-01-05 1900NNE 19.4 23.3----29.97+0.02 68.5 76.1 66.4---
2026-01-05 1850NNE 19.4 23.3 6.9 75.7NNW29.97- 68.7 76.1 66.4---
2026-01-05 1840NNE 19.4 23.3----29.97- 69.1 76.1 66.2---
2026-01-05 1830NNE 19.4 23.3----29.96- 70.2 76.1 66.7---
2026-01-05 1820NNE 19.4 21.4 6.9 85.5WNW29.96- 70.5 76.1 66.4---
2026-01-05 1810NNE 19.4 23.3 6.9-5.5WNW29.96- 70.9 76.1 66.0---
2026-01-05 1800NNE 17.5 21.4----29.96-0.02 70.7 76.1 65.8---
2026-01-05 1750NNE 19.4 23.3 6.6 85.7 NW29.95- 70.7 76.1 65.5---
2026-01-05 1740NNE 17.5 23.3----29.95- 70.5 76.1 65.1---
2026-01-05 1730NNE 19.4 23.3----29.96- 70.9 76.1 65.7---
2026-01-05 1720NNE 19.4 23.3 6.2 65.4 NW29.96- 71.4 76.1 65.7---
2026-01-05 1710NNE 19.4 25.3 6.2-5.4 NW29.95- 71.4 76.1 65.8---
2026-01-05 1700NNE 19.4 23.3----29.96-0.04 71.6 76.1 65.7---
2026-01-05 1650NNE 19.4 21.4 6.2 85.3 NW29.95- 71.8 76.1 66.2---
2026-01-05 1640 N 19.4 25.3----29.95- 71.2 76.1 65.7---
2026-01-05 1630 N 19.4 23.3----29.95- 71.4 76.1 66.4---
2026-01-05 1620NNE 21.4 25.3 5.6 85.3WNW29.96- 71.4 76.1 66.7---
2026-01-05 1610NNE 19.4 23.3 5.6-5.3WNW29.96- 71.6 76.1 66.9---
2026-01-05 1600NNE 19.4 25.3----29.96-0.02 71.8 76.1 66.9---
2026-01-05 1550NNE 19.4 23.3 5.6 85.4 NW29.97- 72.0 76.1 67.1---
2026-01-05 1540NNE 19.4 23.3----29.97- 71.8- 67.1---
2026-01-05 1530NNE 17.5 21.4----29.98- 72.3 76.1 67.6---
2026-01-05 1520NNE 17.5 23.3 5.2 85.6 NW29.98- 72.1 76.1 67.5---
2026-01-05 1510NNE 17.5 21.4 5.2-5.6 NW29.98- 72.3 76.1 67.8---
2026-01-05 1500NNE 19.4 23.3----29.98+0.02 72.7 76.1 67.6---
2026-01-05 1450NNE 17.5 19.4 4.9 85.3 NW29.98- 72.9 76.1 67.5---
2026-01-05 1440NNE 17.5 21.4----29.99- 72.9 76.1 67.3---
2026-01-05 1430NNE 15.5 19.4----29.99- 73.2 76.3 67.6---
2026-01-05 1420NNE 15.5 19.4 4.9 85.5 NW29.99- 73.4 76.3 66.6---
2026-01-05 1410NNE 13.6 15.5 4.9-5.5 NW29.99- 73.4 76.3 66.0---
2026-01-05 1400NNE 13.6 15.5----29.99+0.05 73.6 76.3 67.1---
2026-01-05 1350 N 13.6 17.5 5.2 85.5WNW29.99- 73.4 76.3 66.2---
2026-01-05 1340 N 15.5 19.4----29.98- 73.4 76.3 66.0---
2026-01-05 1330 N 15.5 19.4----29.98- 73.6 76.3 66.2---
2026-01-05 1320 N 11.7 13.6 4.9 85.7WNW29.98- 73.8 76.3 65.5---
2026-01-05 1310 N 9.7 13.6 4.9-5.7WNW29.98- 73.8 76.3 65.3---
2026-01-05 1300 N 9.7 11.7----29.98+0.06 73.8 76.3 65.5---
2026-01-05 1250 N 9.7 11.7 5.2 85.8 NW29.97- 73.6 76.3 64.8---
2026-01-05 1240 N 9.7 11.7 5.2-5.8 NW29.97- 73.6 76.3 65.3---
2026-01-05 1230 N 11.7 13.6----29.97- 73.6 76.3 65.3---
2026-01-05 1220 N 9.7 13.6 4.9 85.7 NW29.96- 73.6 76.3 65.3---
2026-01-05 1210 N 9.7 13.6 4.9-5.7 NW29.96- 73.6 76.3 64.9---
2026-01-05 1200 N 11.7 13.6----29.96+0.05 73.8 76.3 64.9---
2026-01-05 1150 N 11.7 13.6 4.6 65.4 W29.95- 73.8 76.3 65.3---
2026-01-05 1140 N 11.7 15.5----29.95- 73.8 76.5 64.9---
2026-01-05 1130 N 11.7 13.6----29.95- 73.9 76.5 64.9---
2026-01-05 1120 N 11.7 15.5 4.9 65.5 W29.95- 73.9 76.5 64.4---
2026-01-05 1110 N 11.7 15.5 4.9-5.5 W29.94- 74.1 76.5 64.6---
2026-01-05 1100 N 11.7 15.5----29.94+0.05 73.9 76.5 64.0---
2026-01-05 1050 N 11.7 15.5 4.9 85.5NNW29.93- 74.1 76.5 64.0---
2026-01-05 1040NNW 11.7 15.5----29.93- 74.1 76.5 63.3---
2026-01-05 1030NNW 11.7 15.5----29.93- 74.1 76.5 64.4---
2026-01-05 1020NNW 11.7 13.6 5.2 85.7 NW29.93- 74.3 76.5 64.6---
2026-01-05 1010NNW 11.7 15.5 5.2-5.7 NW29.92- 74.1 76.6 64.6---
2026-01-05 1000NNW 9.7 13.6----29.92+0.03 74.3 76.6 65.1---
2026-01-05 0950NNW 9.7 13.6 4.6 85.3 NW29.92- 73.9 76.6 64.8---
2026-01-05 0940NNW 9.7 11.7----29.92- 73.9 76.6 65.7---
2026-01-05 0930NNW 9.7 11.7----29.91- 74.1 76.6 66.2---
2026-01-05 0920NNW 9.7 11.7 4.6 95.5NNW29.91- 73.9 76.6 65.7---
2026-01-05 0910NNW 9.7 13.6 4.6-5.5NNW29.91- 73.8 76.6 66.2---
2026-01-05 0900NNW 7.8 9.7----29.91+0.00 73.8 76.6 67.1---
2026-01-05 0850NNW 9.7 11.7 4.9 85.3WNW29.90- 73.8- 67.1---
2026-01-05 0840NNW 11.7 13.6 4.9-5.3WNW29.90- 73.6 76.6 67.1---
2026-01-05 0830 NW 11.7 13.6----29.90- 73.6 76.8 67.1---
2026-01-05 0820NNW 11.7 13.6 4.6 85.2 NW29.89- 73.6 76.8 67.1---
2026-01-05 0810 NW 11.7 13.6----29.89- 73.8 76.8 67.5---
2026-01-05 0800 NW 13.6 15.5----29.89-0.04 73.8 76.8 67.1---
2026-01-05 0750 NW 13.6 17.5 4.6 85.2 NW29.89- 73.8- 67.3---
2026-01-05 0740 NW 13.6 17.5----29.89- 73.9 76.8 67.8---
2026-01-05 0730 NW 13.6 15.5----29.89- 73.9 76.8 68.0---
2026-01-05 0720WNW 13.6 17.5 4.6 85.1 NW29.89- 73.9 76.8 68.0---
2026-01-05 0710WNW 13.6 17.5 4.6-5.1 NW29.89- 74.1 76.8 68.0---
2026-01-05 0700WNW 13.6 15.5----29.89-0.03 73.9- 67.5---
2026-01-05 0650WNW 11.7 15.5 4.6-5.2 NW29.89-- 76.8----
2026-01-05 0640WNW 13.6 15.5 4.6-5.2 NW29.89- 74.1 76.8 67.6---
2026-01-05 0630WNW 11.7 15.5----29.90- 73.9 76.8 67.6---
2026-01-05 0620 W 13.6 17.5 4.6 95.4NNW29.90-- 76.8----
2026-01-05 0610 W 15.5 19.4----29.91- 74.5 76.8 66.9---
2026-01-05 0600 W 13.6 17.5----29.91-0.02 74.5 76.8 66.7---
2026-01-05 0550 W 15.5 17.5 4.3 95.3NNW29.92- 74.3 76.8 66.4---
2026-01-05 0540 W 15.5 19.4----29.92- 74.5 76.8 67.8---
2026-01-05 0530 W 17.5 19.4----29.92- 74.5 76.8 68.0---
2026-01-05 0520 W 17.5 19.4 4.6 95.6 N29.93- 74.5 77.0 68.2---
2026-01-05 0510 W 15.5 21.4 4.6-5.6 N29.92- 74.5 76.8 69.1---
2026-01-05 0500 W 15.5 19.4----29.92+0.00 74.1 76.8 69.3---
2026-01-05 0450 W 15.5 19.4 4.6 95.7NNW29.92- 73.9 76.8 68.9---
2026-01-05 0440 W 15.5 19.4----29.92- 73.4 76.8 68.9---
2026-01-05 0430 W 17.5 23.3----29.92- 72.3 77.0 68.5---
2026-01-05 0420 W 19.4 25.3 4.3 95.9NNW29.91- 74.3 77.0 68.5---
2026-01-05 0410WSW 11.7 15.5 4.3-5.9NNW29.92- 76.3 77.0 69.3---
2026-01-05 0400WSW 11.7 13.6----29.92-0.01 76.3 77.0 69.1---
2026-01-05 0350 SW 9.7 11.7 4.6 85.8 NW29.92- 76.3 77.0 69.3---
2026-01-05 0340 SW 9.7 11.7----29.93- 76.3 77.0 69.1---
2026-01-05 0330 SW 9.7 11.7----29.93- 76.3 77.0 69.3---
2026-01-05 0320 SW 9.7 11.7 4.3 85.6WNW29.93- 76.3 77.0 69.1---
2026-01-05 0310 SW 9.7 11.7 4.3-5.6WNW29.93- 76.3 77.0 68.9---
2026-01-05 0300 SW 9.7 11.7----29.93+0.00 76.3 77.0 69.1---
2026-01-05 0250 SW 11.7 11.7 4.3 105.5NNE29.94- 76.3 77.0 69.1---
2026-01-05 0240 SW 11.7 13.6----29.94- 76.3 77.0 69.3---
2026-01-05 0230 SW 11.7 13.6----29.94- 76.3 77.0 69.1---
2026-01-05 0220 SW 11.7 13.6 4.6 95.5 NW29.93- 76.1 77.0 69.1---
2026-01-05 0210 SW 11.7 13.6 4.6-5.5 NW29.93- 76.3 77.0 69.4---
2026-01-05 0200 SW 11.7 13.6----29.93+0.00 76.1 77.0 69.4---
2026-01-05 0150 SW 11.7 13.6 4.9 105.6NNW29.93- 76.3 77.0 69.4---
2026-01-05 0140 SW 11.7 13.6 4.9-5.6NNW29.93- 76.3 77.0 69.3---
2026-01-05 0130 SW 11.7 15.5----29.94- 76.3 77.0 69.3---
2026-01-05 0120 SW 13.6 15.5 4.6 95.5NNW29.94- 76.3 77.0 69.1---
2026-01-05 0110 SW 11.7 15.5 4.6-5.5NNW29.94- 76.1 77.0 68.9---
2026-01-05 0100 SW 11.7 13.6----29.93+0.01 76.1 77.0 69.1---
2026-01-05 0050 SW 11.7 13.6 4.6 95.3NNW29.93- 76.1 77.0 69.1---
2026-01-05 0040 SW 11.7 13.6----29.93- 76.1 77.0 68.9---
2026-01-05 0030 SW 11.7 15.5----29.93- 76.1 77.0 69.1---
2026-01-05 0020 SW 11.7 13.6 4.9 85.6WNW29.93- 76.1 77.0 69.1---
2026-01-05 0010 SW 11.7 13.6 4.9-5.6WNW29.93- 76.1 77.0 69.1---
2026-01-05 0000 SW 11.7 15.5----29.93+0.02 75.9 77.0 69.1---
2026-01-04 2350 SW 11.7 15.5 4.9 65.5 S29.93- 75.9 77.0 69.3---
2026-01-04 2340 SW 11.7 15.5----29.93- 75.9 77.0 69.4---
2026-01-04 2320WSW 11.7 13.6 5.2 105.6 N29.93- 75.9 77.0 69.6---
2026-01-04 2310 SW 13.6 15.5 5.2-5.6 N29.93- 75.9 77.0 69.3---
2026-01-04 2300 SW 13.6 15.5----29.93+0.02 75.7 77.0 68.7---
2026-01-04 2250 SW 13.6 15.5 4.9 105.4 N29.93- 75.7 77.0 68.9---
2026-01-04 2240 SW 13.6 17.5----29.93- 75.7 77.0 68.7---
2026-01-04 2230WSW 15.5 17.5----29.93- 75.7 77.0 68.5---
2026-01-04 2220 SW 13.6 17.5 4.9 65.4 S29.93- 75.7 77.0 68.5---
2026-01-04 2210 SW 13.6 17.5 4.9-5.4 S29.92- 75.6 77.0 68.7---
2026-01-04 2200WSW 13.6 17.5----29.92+0.01 75.6 77.0 69.1---
2026-01-04 2150WSW 13.6 15.5 5.2 85.5 NW29.92- 75.6 77.0 68.9---

Wave Summary
for 41049 as of
2210 GMT on 01/05/2026:

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): 7.5 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): 5.9 ft
5-day plot - Wind Wave Period Wind Wave Period (WWP): 6.2 sec
5-day plot - Wind Wave Direction Wind Wave Direction (WWD): N
5-day plot - Wave Steepness Wave Steepness (STEEPNESS):VERY_STEEP
5-day plot - Average Wave Period Average Wave Period (APD): 5.9 sec
Previous observations
TIME
(GMT)
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
2026-01-05 2140 6.9 2.6 13.8 NE 6.6 7.1 NW STEEP 5.9
2026-01-05 2110 7.2 3.0 13.8 N 6.6 8.3 NW STEEP 5.8
2026-01-05 2040 6.9 4.6 8.3WNW 5.2 6.2 NNW AVERAGE 5.8
2026-01-05 2010 7.2 2.6 14.8 NE 6.6 8.3 NW STEEP 5.7
2026-01-05 1940 7.2 1.6 13.8 E 7.2 6.7 NWVERY_STEEP 5.8
2026-01-05 1910 7.2 3.3 9.1 NW 6.6 7.7 NW STEEP 5.9
2026-01-05 1840 6.9 2.6 13.8 SE 6.2 6.7 NNW STEEP 5.7
2026-01-05 1810 6.9 2.3 16.0 NE 6.6 8.3 WNW AVERAGE 5.5
2026-01-05 1740 6.6 2.6 10.8 N 6.2 8.3 NW AVERAGE 5.7
2026-01-05 1710 6.2 2.3 11.4NNE 5.9 5.6 NWVERY_STEEP 5.4
2026-01-05 1640 6.2 2.0 10.8NNE 5.6 8.3 NW AVERAGE 5.3
2026-01-05 1610 5.6 2.6 8.3WNW 4.6 4.8 NNW AVERAGE 5.3
2026-01-05 1540 5.6 3.0 8.3 NW 4.6 7.1 WNW AVERAGE 5.4
2026-01-05 1510 5.2 3.6 8.3 NW 3.9 5.3 W AVERAGE 5.6
2026-01-05 1440 4.9 2.6 8.3 NW 4.3 5.3 W AVERAGE 5.3
2026-01-05 1410 4.9 3.6 8.3 NW 3.3 5.6 W AVERAGE 5.5
2026-01-05 1340 5.2 3.0 7.7WNW 4.3 5.6 WSW AVERAGE 5.5
2026-01-05 1310 4.9 4.3 7.7WNW 2.6 5.3 W AVERAGE 5.7
2026-01-05 1240 5.2 4.9 8.3 NW 2.0 4.3 W AVERAGE 5.8
2026-01-05 1210 4.9 4.6 8.3 NW 2.3 4.8 W AVERAGE 5.7
2026-01-05 1140 4.6 3.6 6.2 W 3.0 5.0 WSW STEEP 5.4
2026-01-05 1110 4.9 3.6 9.1NNW 3.3 5.9 WVERY_STEEP 5.5
2026-01-05 1040 4.9 3.6 8.3NNW 3.3 5.6 WSW AVERAGE 5.5
2026-01-05 1010 5.2 3.9 7.7 NW 3.3 5.6 WSW AVERAGE 5.7
2026-01-05 0940 4.6 3.6 7.7 NW 2.6 3.8 WNW AVERAGE 5.3
2026-01-05 0910 4.6 4.3 9.1NNW 2.0 3.8 WNW SWELL 5.5
2026-01-05 0840 4.9 3.9 8.3WNW 3.0 4.8 W AVERAGE 5.3
2026-01-05 0810 4.6 3.6 8.3 NW 3.0 5.0 W AVERAGE 5.2
2026-01-05 0740 4.6 2.6 8.3 NW 3.6 6.2 S AVERAGE 5.2
2026-01-05 0710 4.6 2.6 8.3 NW 3.9 4.8 WSW AVERAGE 5.1
2026-01-05 0640 4.6 3.0 8.3 NW 3.6 5.9 S AVERAGE 5.2
2026-01-05 0610 4.6 3.0 9.1NNW 3.6 5.6 S AVERAGE 5.4
2026-01-05 0540 4.3 2.6 9.1NNW 3.3 6.2 SSE AVERAGE 5.3
2026-01-05 0510 4.6 3.3 9.1 N 3.3 5.9 S SWELL 5.6
2026-01-05 0440 4.6 3.3 9.1NNW 3.6 6.2 SSW AVERAGE 5.7
2026-01-05 0410 4.3 3.6 9.1NNW 2.6 5.6 SSE SWELL 5.9
2026-01-05 0340 4.6 4.3 8.3 NW 2.3 4.0 SSW AVERAGE 5.8
2026-01-05 0310 4.3 3.9 7.7WNW 2.0 4.3 SW AVERAGE 5.6
2026-01-05 0240 4.3 3.6 10.0NNE 2.6 5.3 S SWELL 5.5
2026-01-05 0210 4.6 3.9 9.1 NW 2.6 5.3 S SWELL 5.5
2026-01-05 0140 4.9 3.6 10.0NNW 3.0 5.9 S SWELL 5.6
2026-01-05 0110 4.6 3.6 9.1NNW 3.0 5.6 SSE SWELL 5.5
2026-01-05 0040 4.6 3.3 9.1NNW 3.3 5.6 SSW SWELL 5.3
2026-01-05 0010 4.9 3.6 7.7WNW 3.3 5.6 S AVERAGE 5.6
2026-01-04 2340 4.9 3.6 9.1 NW 3.3 5.9 SVERY_STEEP 5.5
2026-01-04 2310 5.2 3.9 10.0 N 3.6 5.3 S SWELL 5.6
2026-01-04 2240 4.9 3.6 10.0 N 3.6 5.6 S SWELL 5.4
2026-01-04 2210 4.9 3.3 10.0 N 3.9 5.9 SVERY_STEEP 5.4

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