The physics, coefficient by coefficient

Maps wind speed to the Beaufort force every wind sport is scored against.

Sun altitude + azimuth → daylight, golden hour and UV windows, accurate to 2050.

Reconstructs tide phase + height from harmonic constants for any coast.

Power per metre of crest — the marine kernel behind surf, kite, windsurf and sail.

Blends satellite sea-surface temperature into the marine state.

Back-propagates swell trains to their generating storm by group velocity.

Sea-floor depth shapes how swell refracts and breaks at a spot.

Coastal fog formation → visibility for sailing and diving.

Iribarren number — spilling, plunging or surging breakers.

How offshore wave height translates to breaker height inshore.

Predicts the thermal breeze that makes or breaks an afternoon session.

Turbulence + gust factor from the boundary-layer state.

Universal Thermal Climate Index — felt temperature, not just air temperature.

Heat-stress index for land sports in hot, humid conditions.

Lifting condensation level — the cloud base paragliders read.

Rain / sleet / snow partition from the vertical temperature profile.

New-snow density for avalanche + ski-touring assessment.

A universal hard gate — forces 'unsafe' regardless of the rest.

EPA AQI breakpoints — a hard gate when air is hazardous.

Flags rip risk for swimming and surf entry/exit.

Freeze–thaw cycling that drives rockfall risk for climbers.

Erythemal UV dose by skin type — a health advisory, not a gate.

30+ NWP members → a score distribution, not a point estimate.

Refits curves against real outcomes once enough have accrued.