冰雪资料的准备

• 实时的北半球1公里分辨率冰雪资料，每天下载一次，资料位置在：

  https://www.natice.noaa.gov/ims/grib2_v3_p2_2020_4km.html
  

• 为了可以在 RAP 和 HRRR 系统中使用，必须做以下操作:

  # in cron jobs, please do sync as following
  15,30,45,0 * * * * rsync -av /path/of/imssnow/rap.20* ${ROOT_DIR}/com/rap/prod
  # Populate to *rap_e* directory for *HRRR* access
  15,30,45,0 * * * * ${ROOT_DIR}/utils/imssnow_populate.py
  
  
  # 请修改如下脚本，设置正确的SNOWICE数据的路径:
  $  ${ROOT_DIR}/nwprod/rap.v4.0.12/scripts/exrap_check_imssnow.sh.ecf
  $  ${ROOT_DIR}/nwprod/rap.v4.0.12/scripts/exrap_analysis.sh.ecf
  

• rap (cyc = 00)

  exrap_analysis.sh.ecf
  # process_imssnow run after DA
  

• hrrr (cyc = 00)

  exhrrr_analysis.sh.ecf
  #  process_imssnow run after DA
  

• process_imssnow 修改如下变量：

  1. LU_INDEX
  2. SEAICE
  3. IVGTYP
  4. ISLTYP
  5. SNOW
  6. SNOWH
  7. SNOWC
  8. XLAND
  9. LANDMASK