Weather SlateForecasts and observations answer different questions
A forecast estimates future conditions. An observation describes information measured or detected at a particular time and place. A weather app can bring both together, but it should not make them interchangeable.
An hourly forecast cell, a current condition, and a historical radar frame may have different update times. Check the label and timestamp before comparing them. The time you opened an app does not automatically become the observation time for every value.
The sources behind the experience
- Apple Weather / WeatherKit
- Provides forecast and weather information used by the app. Apple documents current conditions, hourly and daily forecasts, and next-hour precipitation in supported regions. See WeatherKit.
- NOAA / National Weather Service
- Provides official U.S. alerts and other weather information used in the product direction, including radar source data and climate context.
- NOAA / MRMS
- The Multi-Radar/Multi-Sensor system combines observations into multiple weather products. Weather Slate’s own radar delivery work is based around this U.S. data foundation. See NOAA’s MRMS overview.
Cloudflare supports website and backend delivery. Hosting and caching are parts of delivery, not a separate meteorological forecast source. Naming a provider does not imply endorsement.
Probability is information, not a defect
A forecast’s uncertainty can affect whether you make a flexible plan or need a dependable fallback. A percentage is useful because it expresses likelihood instead of pretending an uncertain outcome is settled.
Coverage and confidence vary with location, weather pattern, and forecast horizon. A missing weather field should be read as unavailable information, not a calm wind, a zero rain chance, or a safe situation.
What Weather Slate adds
The product’s role is to organize the information into readable views, a comfort score, explanations, and planning context. It is not presented as a replacement for professional forecasting or as a source guaranteed to outperform every other app.
Weather Score and story text do not use generative AI. The score is not an official hazard index. Pre-launch radar and alert delivery still need validation, and this website does not certify their readiness.
Where to go when conditions matter
Read official NWS information and local instructions for hazards. Use the appropriate specialist sources for aviation, marine operations, road restrictions, or emergency decisions.
For ordinary planning, combine the relevant hours, radar context, and the information you can observe locally. Check the policy for data handling; source transparency and privacy explain different parts of the service.