Data & sources

Every v1 source is public and machine-readable. Federal data is public domain. State and university material is free but not public domain, so it is attributed on every figure and never copied as text.

Sources

This product uses the NASS API but is not endorsed or certified by NASS. CIMIS figures: Data: California Irrigation Management Information System, California Department of Water Resources.

Cited threshold library

Every alert threshold is a cited fact from a regulation, a UC publication or the National Weather Service. Presets carry a version and an effective date and are re-verified after any rulemaking notice.

Citrus and nursery frost presets are added once their thresholds are verified from a primary UC source. Avocado variety thresholds (UC ANR): Mexican types 25°F, Fuerte and Puebla 28°F, Hass, Ryan and Nabal 29°F, Anaheim, Carlsbad and Hellen 30°F.

Revision policy and provenance

• Every stored value carries its source URL, release and the key of the raw file it was parsed from. Any number can be re-derived from that file.
• Values are never overwritten. A revised value is a new row, so revisions are visible as differences.
• Raw files are written before parsing, so a failed parse never loses a release.
• Forecasts keep the latest forecast for each hour plus a daily snapshot; every forecast file is kept in the raw store.
• Every alert stores the forecast it was based on.

How the alerts are doing

Every morning we compare yesterday's frost and heat alerts with what the nearest NWS station recorded: a hit, a miss or a false alarm.

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