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Preserve metric forecast units and overnight alerts

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Eric Rakestraw
2026-08-13 00:45:08 +00:00
parent 8fafacf921
commit 8e49ba88c7
5 changed files with 230 additions and 45 deletions
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8
docs/internal/forecast-derivation.md
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@@ -33,9 +33,17 @@ sorts periods, records the maximum and first precipitation, groups contiguous
periods at or above its package-owned probability threshold, and records
thunder mentions.
Daypart temperature and apparent-temperature ranges are Fahrenheit values, and
timed wind maxima are mph values. When only metric source fields are present,
they are converted to those units before they are stored or evaluated against
indicator thresholds; populated US-customary fields take precedence.
Alert overlap parsing supports the normalized alert payload's available timing
fields. Unparseable alerts and invalid intervals are ignored; valid overlaps
are clipped to the requested period and ordered by alert start time.
`DailySummary.AlertOverlaps` is limited to the local civil day, while each
daypart evaluates the full alert run against its complete window, including the
next-day portion of an overnight window.
## Missing data and failures