A Nonclassical Gust Front and a Solitary Wave Embedded within a Typhoon as Observed with Doppler Radar and Wind Profiler

摘要: Observations from a Doppler radar, wind profiler, and meteorological tower were used to study the evolution of two thin-line echoes that observed in radar reflectivity field over Kanto Plain Japan as Typhoon Higos (0221) passed October 2002. Both accompanied by gusty winds followed cold airflows, both site Meteorological Research Institute (MRI) Tsukuba, Japan. Data MRI instrument array surface observation network revealed first echo was caused gust front, second solitary wave.Although it demonstrated due this front could not be categorized so-called thunderstorm because had no parent thunderstorm; rather, profiler observations suggested relatively strong (∼4ms-1 downdrafts large momentum transported aloft (∼4 km) lower levels produced enhanced near-surface behind front. In contrast, wave associated with likely developed another generated an outer rainband south typhoon center met stable layer formed outflow echo. The ducting mechanism enabled propagate also radiosonde measurements.