CHC Skills

Climate Hazards Center (CHC) skills for SubC multi-model-ensemble forecasts, Indian Ocean Dipole (IOD) analysis, CPC MJO forecast diagrams, and Africa ITF position figures. Built on weather-skills-core (pinned to main).

Skills

Skill	Role
subc-mme-fetch	Fetch and stitch SubC global MME mean + anomaly NetCDFs (7/15/30-day leads) into one forecast Zarr
iod-mode-index	Dipole Mode Index (West − East) plus west/east box means from a pre-computed temperature anomaly
mjo-forecast-fetch	Fetch the latest CPC CLIVAR MJO Wheeler–Hendon phase-space PNG (GEFS / ECMWF / ECMWF extended-range)
africa-itf	Fetch the latest NOAA/CPC Africa ITF / ITCZ position PNG for one region (--location africa|west-africa|east-africa; CPC uses both terms)

Quick start

uv sync --group dev
uv run pytest

# SubC MME for one init
uv run skills/subc-mme-fetch/scripts/fetch.py --date 2025-12-01 -o /tmp/subc.zarr

# IOD from a temperature-anomaly field (forecast or observations)
uv run skills/iod-mode-index/scripts/iod.py \
  -i /tmp/subc.zarr -v ts_anomaly -o /tmp/iod.zarr

# Latest CPC MJO phase-space diagram (GEFS, bias-corrected by default)
uv run skills/mjo-forecast-fetch/scripts/fetch.py --model gefs -o /tmp/mjo.png

# Latest CPC Africa ITF position map (default --location africa)
uv run skills/africa-itf/scripts/fetch.py -o /tmp/itf_africa.png

If anomalies are not already in the input, compute them first (climatology + difference from forecasting-skills), then run iod-mode-index. To view SST or precip over the Indian Ocean without computing the index, plot those variables over an Indian Ocean bbox and optionally overlay the west/east dipole boxes (see iod-mode-index SKILL.md).

Install as a Claude plugin

./install_agent.sh
# or:
claude plugin marketplace add rhiza-research/chc-skills
claude plugin install rhiza-chc@chc-skills

Layout

Same packaging model as forecasting-skills: canonical skills under skills/<name>/, Claude plugin via .claude-plugin/ + agents/, CLI via skills-runner.

See CONTRIBUTING.md.