The high day temperatures cause relatively fast drying, so there is a great potential for a significant portion of the rice to dry below the critical moisture. Each night the humidity rises and dew forms on the driest most exposed kernels [kernel] in each panicle. Windy low humidity conditions at night will reduce fissuring losses. During harvest in California these conditions occur during periods of north wind. But since fields dry quickly under these conditions, they must be harvested rapidly before high night humidity conditions return.