Neither Met Office's Global Spot API nor Open-Meteo return a narrative text
summary -- both are purely numeric/coded. New lib/summary.js derives one
rule-based from today's already-fetched hourly points (icon + precip_prob),
no extra API call, no LLM:
- Headline: "Scattered showers today", "Rain likely later", "Heavy rain
today", "Dry today", etc. -- compares rain distribution across the whole
day vs specifically the hours still ahead of "now".
- Note: "Thunderstorms possible", appended when a thunder icon shows up.
- Umbrella nudge: shown when there's a real rain chance now or later today.
Computed fresh per-request (not cached at fetch time), since "later" means
later than whoever's looking at the screen right now, not later than the
last hourly refresh.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
jtricerolph
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