Hot and windy - peculiar, unpleasant sort of weather. It started to rain at 5pm, got wet on my way home. Very warm and humid. Noticed that the water in all the puddles was yellow: suspected continental pollution borne on the East wind we've been having for at least a week, but on realising that the washing on the line was still clean, deduced that the rain had washed yellow boulder clay dust into the puddles, the amount of dust due to the length of time since it last rained.