A study of the use of atmospheric‐electric measurements in fog forecasting

Abstract

A statistical study of atmospheric‐electric and pertinent meteorological data collected in Argentia, Newfoundland, from January through September 1955, shows that fogs produce a decrease in the electrical conductivity with a concurrent increase in potential gradient. A quantitative analysis of the data shows that during fog (horizontal visibility less than ½ mile, ceiling less than 200 ft) the average conductivity was less than 0.65 times the monthly mean 92 pct of the time and the average potential gradient was more than 2.0 times the monthly mean 87 pct of the time. From one to two hours preceding the onset of fog the conductivity decreased and the potential gradient increased in about 70 pct of the events. One hour prior to dissipation of fog conductivity increased and potential gradient decreased in 75 pct of the events. Similar studies should be made in additional areas to determine whether the Newfoundland results are unique or may be encountered more generally.