Observed arrival · 2026-10-15
Karl, San Francisco’s fog-line scout
An interactive forecast compares fog and sunshine conditions across eleven San Francisco spots for the next 24 hours.
○Open
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$Paid
†Ads
✦Pretty
●Pro
◎Niche
◉Human
⚑Risk
ƒJS
- For
- San Francisco residents chasing sun or avoiding fog
- Worth noticing
- The cross-section and ranked list use the same spot-level readings; a 3 km model grid limits how precisely the tool can place the fog front.
Field notes
The page explains its clear-sky rule: cloud overhead must be below 45 percent and visibility above 5 km. It compares cloud at four altitudes with each location’s elevation, and the chart’s fog-line edge reflects the model’s uncertainty. The hourly forecast is scrubbed in quarter-hour steps, while the underlying data comes from Open-Meteo.
Observed signals
Read the marks
Editorial observations of this landing page, not a rating.
○OpenPublic substance visible
✦PrettyNotable craft visible
●ProPolished or operationally mature
◎NicheUnusually specific use
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