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- W2462866366 abstract "The ascent rates of individual radar echoes of thunderclouds in the Hokuriku district were investigated in relation to lightning activity. Both CAPPI radar and the sferics direction-finding system were used for this investigation. Multicell-type thunderstorms containing several moderate to strong precipitating domains were observed by means of a conventional 5.7 cm weather radar and 100.5 MHz sferics direction-finding system installed at Komatsu Airport and its periphery. The results are briefly summarized as follows:1) The first lightning discharge appears about five minutes after the 30 dBZ reflectivity echo exceeds the -20°C temperature level.2) The mean ascending velocity of echoes just before the initial reception of sferics from them is about the same both in summer and winter. By contrast, in cases without lightning activity, the 20-to-45 dBZ echoes have nearly the same ascending velocity as those with lightning activity in winter, but, in summer, the 20 and 25 dBZ echoes have a higher ascending velocity and the 30 and 35 dBZ echoes and equal or lower velocity than those with lightning activity.3) In cases of very intense lightning activity, the 20-to-35 dBZ echoes ascend much faster than the 40 and 45 dBZ echoes in summer, while in winter, the 20-to-35 dBZ echoes ascend slowly or remain stationary and the 40 and 45 dBZ echoes ascend very fast.4) In both summer and winter, the peak of lightning activity is observed when several strong echoes of 45 or 50 dBZ are formed at the -10°C temperature level and descend toward the 0°C temperature level. Takahashi (1984) established a rational thundercloud model through numerical calculation and clarified the characteristic convective and electrical activity of cloud cells in correlation with their life cycle. The present observational results can be interpreted as evidence that Takahashi's model corresponds well with actual thunderclouds observed in the Hokuriku district." @default.
- W2462866366 created "2016-07-22" @default.
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- W2462866366 date "1991-01-01" @default.
- W2462866366 modified "2023-10-17" @default.
- W2462866366 title "A Study of Radar Echoes and their Relation to Lightning Discharge of Thunderclouds in the Hokuriku District" @default.
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- W2462866366 doi "https://doi.org/10.2151/jmsj1965.69.3_327" @default.
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