Tides and Currents
Maximum variation between high and low water is approximately 4 ft. The average variation is approximately 2 ft. There is no tidal information for Ashkelon, neither in U.S.H.O nor in British Admiralty Tide Tables, but data for the Port of Tel-Aviv can serve as a guideline. Currents are generally in a northerly direction but may change in the event of northerly storms.
Wind and Sea
Winter weather along the coast is influenced by the passage of active depressions every five to eight days on average. These depressions are heralded by strong southerly winds, which may be dust-laden. Gale force is reached occasionally. After some time winds veer southwesterly and with the shifting of the depressions, winds become northwesterly and tend to become calmer.
This is the period of prevailing calm seas in the coastal waters. Land and sea breezes are minimal. The passage of wintry type disturbances slowly decreases in frequency during the season, and may cause relatively short periods of bad weather, mainly in March.
During the summer there are no special weather conditions. The state of the sea is influenced by the diurnal passage of breezes along the coasts and a westerly to northwesterly gradient wind offshore. The only change in weather is caused by variations in the strength of the wind due to the passing of minor (cold air/warm air) fronts. Although there are no high seas, summer is a season of continuous agitation of the coastal waters.
This is the period of prevailing calm seas in the coastal waters. Land and sea breezes are minimal. The passage of wintry type disturbances slowly increase in frequency during the season and may cause relatively short periods of bad weather in October and especially in November, similar to those described for the winter season.
Fog is a relatively rare phenomenon. Its occurrence is generally connected with Hamsin conditions when relatively cool and moist easterly winds prevail on such days. The fog generally occurs over the coastal waters and the coastal strip during the night and may last until mid morning. There is a distinct seasonal distribution of foggy days with a minimum in August-September, a pronounced maximum from April to June, and variable conditions during the other months. The month with the greatest amount of fog is April, when 2-3 days of fog may be encountered on average.
Storms occur generally during the winter months, the highest frequency being in January. During that month, there are usually 15 days when the height of the waves exceeds 2.0 m and about seven days when it exceeds 3.0 m. During December, February and March 11 to 12 stormy days can be expected, where waves exceed 2.0 m in height.