tropical depression

基本解释

Under the state of binary typhoons, the development of South China Sea tropical depression depended on the strength and distances of two OLR low centers.
在双台风状态下，两个低值中心的强弱情况和距离决定热带低压能否发展。
qk.cams.cma.gov.cn
The Shanghai heavy rainfall event on 5~6 August 2001( 0185 event, in abbreviation) caused by tropical depression(TD) is a typical high-impact and severe weather.
发生在上海地区的2001年8月5～6日热带低压特大暴雨过程（简称“0185”过程）是一次高影响性、灾害性天气。
Atlantic Tropical Storm Karen faded into a tropical depression and was likely to dissipate soon, with winds of 35 mph about 495 miles east of the Leeward Islands.
太平洋热带风暴克林已减弱为热带气压，预计很快消散，它在里沃岛东以每小时35英里的速度前进。

Of course, hurricane season starts June 1st and we still have a tropical depression -- the second named storm of the season.
WHITEHOUSE: Press Briefing
FEMA, through its regional officials in Atlanta, New York, and Denton, Texas, is also closely monitoring the remains of Tropical Depression Lee as it moves over southeastern states.
WHITEHOUSE: Press Briefing

an area of heavy rains and winds, the first stage in the development of a possible hurricane