Tides And Currents Flashcards
VTS broadcast
VTS will provide tidal advisory broadcast when the height of tide exceeds 10fr in Seattle. When tidal state exceeds 10fr in Seattle vessels should proceed at a safe speed to minimize risk of wake damage
Seattle mean range
7.7ft normal mean range
11.4ft normal diurnal range
18ft max range
Bremerton tide range
8.0 mean range
11.4 normal diurnal range
Currents rich pass
1) current velocities increase from E to W in Rich pass. The strongest observers currents were 4kts on the flood and 5kts on the ebb between Pt. Glover and Pt. White. Ferry pilots have experienced ebb currents of at least 6kts in the vicinity of light “10”
2) Eddie’s and counter currents in the ebb greatly diminish the effective width of the passage and increase the velocities in the channel.
3) outbound deep draft vessels making the sharp turn may be unavoidably set well over toward the east shore, necessitating a 2 blast, starboard to starboard meeting with inbound vessels.
Elliot bay
As a rule the tidal currents have little velocity. At times however with a falling tide an appreciable current will be found setting NW along the waterfront.
West waterway
Strong currents exist on the ebb tide and during freshets at the fisher mills wharf.
Eagle harbor
Currents are minimal and vary with tidal influence
Port orchard
Current observations taken indicate that the tidal current is very weak in this location.
Port Washington narrows
Tidal current attain velocities in excess of 4kts with tide rips off rocky Pt. On the west side of the north entrance of the narrows.
