Dartmouth to English channel, Visibility and dive conditions

See bottom of table for explanation of headings. The potential outlook for diving over the next few days is given in good faith and without any guarantee!

See the page for MV Maureen availability regarding dates for charter and contact Mike Rowley to book.

Date Time Site Viz (m) Cloud /
Sun / Rain
Tide
hr +/- HW
Present
Sea State / Swell /
Dive conditions
Comments /
Potential Outlook
16-20
June 08
-- Scilly Islands 6-12m

--

-- Sea temp 14°C, Viz varied from 6m to 12m around the Islands --
24/05/08 -- Brittany 7-8m

--

-- Sea temp 13°C --
25
29/06/07
-- Scilly Islands ~4m

--

-- Vis generally 4m around the islands, this is pretty well the maximum at the moment, quite poor for the Scillies. It seems to be due to either plankton or algae. Water temp is 13 - 14 C. Weather has been very unsettled with NW or W F4 - F7 most days and some heavy rain. --
23/06/07 -- Manacles (off Falmouth, Cornwall) 4-5m

--

-- Vis was 4m - 5m, again mostly due to plankton. --
18 -
22/06/07
-- Baie de Seine (Normandy) 1m
8-10m

--

-- Vis was 1m inshore and 8 - 10 m offshore. --
18 -
22/06/07
-- Cherbourg (Normandy) 10 - 12m

--

-- plankton band at about 10m depth --

 

Visibility is the depth to which a white disk (secchi disk) is visible from the surface, measured as the average of two readings - the depth to which it is lowered and just no longer visible, and the depth at which it reappears when raised. (Usually there is not too much difference between the two). A tilde indicates an approximate reading that is estimated rather than measured (eg: measured: 5, approx: ~5). Note that surface visibility is often different to visibility at depth. Cloud cover and the height of the sun (indicated by time of day, and/or the approximate angle of the sun in the sky) and sea state will also affect visibility. Cloud cover is measured in octas (8=8/8 = total cloud cover, 0=0/8 = clear sky). The state of the tide when the viz was measured is indicated as number of hours +/- HW Greenock and the approximate tidal cycle is indicated by the background: blue = Neaps, red = Springs, yellow = in between.

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