This program is written by Gary Wee.
Date: 2022 Jun 23
This program downloads dual polarization radar's echo image from cwb.gov.tw.
Latest radar's echo images are shown in https://www.cwb.gov.tw/V8/C/W/OBS_Radar_rain.html
However, you cannot find the images for more than a few hours ago.
Therefore, this program finds the outdated images and downloads them.