(March 29, 2006 continued...) The survey of one strandline from Shoebury to Leigh done on March 24 was therefore repeated, starting at Chalkwell Station with a wild grey tide just on the ebb around 2 p.m. British Summer Time near the predicted height 3.3 m above mean sea-level (Ordnance Datum). The studied March 24 tide had a predicted altitude of 1.6 m O.D. and the next one which permitted the strandline to be studied was only predicted to reach 1.4 m O.D. Tides are highest, in terms of astronomical predictions but not weather conditions, around the Spring Equinox on March 20 and the other equinox on September 23 this year. But the highest predicted tides do not occur exactly on these dates being likely to occur one day after the full moon and one-hour after the true (not British Summer Time) midday or midnight at Southend.