Abstract
The winter thunderclouds that frequently come the southeastern coastal area of the Sea of Japan were investigated by field works, operating two weather radars (one is C-band, another is X-band), the sferics direction-finding system, the car-borne fieldmill, and the SAFIR system.
The grade of lightning activity is restricted by the upper air temperature. When cold airmass is advected in lower part of the Hokuriku district, the clouds exhibit weak or no lightning activity. Furthermore, the very good relation between the temporal variation of radar echo and lightning discharges detected by the SAFIR system was confirmed.
The SAFIR system can be sufficiently adapted with detecting winter thunderclouds lightning activity in the Hokuriku district.
