Methodology
One clear answer, with the reasoning close by.
Nature Says When evaluates the full activity interval—not just its starting moment—and leads with the few conditions that actually change the decision.
What the answer considers
Every complete recommendation checks thermal conditions, precipitation, wind, US air quality, UV and daylight, thunder potential, and active official hazards. Activity, duration, and your optional environmental sensitivities adjust how those conditions are interpreted.
- Heat + cold
- Rain
- Wind
- Air quality
- UV + daylight
- Thunder
- Official hazards
How verdicts work
The assessed conditions fit without a material limiting factor.
The plan can work but deserves attention.
A nearby option is preferable.
Reserved for a blocker such as a governing official warning or major environmental concern.
How good windows are selected
Candidate starts are evaluated every 15 minutes across the full activity interval. The primary answer is the earliest strong or workable span, so a slightly more pristine window tomorrow does not hide a useful option now. Adjacent recommendable starts are shown as one span. Deterministic ranking is still used for later alternatives.
Complete horizon and extended outlook
The integrated recommendation stops where required sources no longer overlap. Later weather may appear for up to seven days as a lower-confidence Extended outlook, but it receives no integrated verdict, best-time badge, or ranking.
When we withhold an answer
If a required source, official-alert check, or supported forecast interval is missing, the product says Complete recommendation unavailable. It does not fill gaps with invented values or make a partial result look complete.
What the answer cannot know
The V1 result evaluates one selected point. It does not know your route, terrain, equipment, fitness, shade, local surface conditions, evacuation status, or conditions between source grid points. It is planning guidance—not medical advice, emergency instruction, or a claim that an activity is “safe.”