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Validate precipitation probabilities and ice wording

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Eric Rakestraw
2026-08-13 00:48:40 +00:00
parent 8e49ba88c7
commit 730929e2ed
10 changed files with 142 additions and 1 deletions
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docs/internal/forecast-derivation.md
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@@ -26,12 +26,18 @@ its selected hourly periods and derives temperature and apparent-temperature
ranges, timed precipitation and wind maxima, dominant and notable conditions,
and weather indicators.
Hourly precipitation probabilities must be finite percentages from 0 through
100. Daily-summary construction rejects invalid values before they can affect
timed maxima or precipitation windows.
Indicators are deterministic checks over normalized values and condition text:
heat, cold, and wind use package-owned numeric cutoffs; snow, ice, fog, and
wind text are detected from the forecast description. `BuildPrecipTiming`
sorts periods, records the maximum and first precipitation, groups contiguous
periods at or above its package-owned probability threshold, and records
thunder mentions.
Ice detection uses the bounded condition vocabulary `ice`, `icy`, `freezing`,
and `sleet` as whole words.
Daypart temperature and apparent-temperature ranges are Fahrenheit values, and
timed wind maxima are mph values. When only metric source fields are present,