CHARGED PRECIPITATION MEASUREMENTS BEFORE THE 1ST LIGHTNING FLASH IN A THUNDERSTORM

On August 15, 1984, we made balloon measurements of the electric field and of the charge and vertical-velocity of precipitation particles in a thunderstorm over Langmuir Laboratory. Substantial quantities of po sitively charged precipitation, comprising a lower positive charge cen ter, were collected before the storm's first lightning flash. Possible origins of the positive charge are discussed. Negatively charged prec ipitation and positively charged cloud particles found higher in the c loud seem to have generated electrical energy in the way suggested in the typical precipitation theory of thunderstorm electrification.