Abstract
We measured the Yamase low cloud and fog, by employing a new observation system with a combination of an optical radar and a solar radiation meter, and revealed several characteristics of the “Yamase in 1993”, -the vertical density distribution and the thickness of the Yamase low cloud and fog, its speed, the prevailing periods of its development, as well as solar radiation intensity. Obtained results are as follows.1) The extreme low temperature and low solar radiation caused the worst agricultural disaster.2) The fog near the ground had been observed only a few times in the summer season, which is quite different from these 10 years.3) The solar radiation when the Yamase intruded was less than 1/5, compared with that of a fine day.4) Very low and thick clouds were observed rather than fog, and the height was less than 800m.5) It is shown that the Yamase fog stays during the night and next day or a few days after an intrusion or a generation.
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