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update GEFS reforcast template to include extended range on Wednesdays #378

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update GEFS reforcast template to include extended range on Wednesdays #378

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08d947e
update GEFS reforcast template to include extended range on Wednesdays
blaylockbk Oct 29, 2024
1095f2c
Update gefs.py
blaylockbk Oct 31, 2024
82fb979
Merge branch 'main' of https://github.com/blaylockbk/Herbie into 377-…
blaylockbk Feb 5, 2025
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14 changes: 11 additions & 3 deletions herbie/models/gefs.py
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Original file line number Diff line number Diff line change
Expand Up @@ -140,22 +140,30 @@ def template(self):
"GEFSv12/reforecast": "reforecasts for 2000-2019",
}

if self.date.weekday() == 2:
# GEFS reforecast has extended ensemble on Wednesdays
max_member_size = 10
max_fxx = "Days:10-35"
else:
max_member_size = 4
max_fxx = "Days:10-16"

# Adjust "member" argument
# - Member 0 is the control member
# - Members 1-4 are the perturbation members
if self.member == 0:
member = f"c{self.member:02d}"
elif self.member > 0 and self.member < 5:
elif self.member > 0 and self.member <= max_member_size:
member = f"p{self.member:02d}"
else:
raise ValueError("GEFS 'member' must be one of {0,1,2,3,4}.")
raise ValueError(f"GEFS 'member' must be within range of [0 - {max_member_size}].")

# Adjust "fxx" argument (given in hours)
# This is used to define the directory to enter rather than the filename.
if self.fxx <= 240:
fxx = "Days:1-10"
else:
fxx = "Days:10-16"
fxx = max_fxx

post_root = f"GEFSv12/reforecast/{self.date:%Y/%Y%m%d%H}/{member}/{fxx}/{self.variable_level}_{self.date:%Y%m%d%H}_{member}.grib2"

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