API for weather alerts and forecasts

Here are a few solid API options for weather alerts and forecasts, depending on your needs:

1) NOAA / NWS API (U.S. only)

• Best for: Free, authoritative U.S. weather forecasts and alerts
• Coverage: United States
• Features:
  • Forecasts
  • Active alerts/warnings/watch boxes
  • Gridpoint forecasts
  • Observation stations
• Docs: https://www.weather.gov/documentation/services-web-api
• Pros: Free, official, no API key required in many cases
• Cons: U.S.-only, responses can be a bit technical

Common endpoints

• GET /alerts/active
• GET /points/{lat},{lon}
• GET /gridpoints/{office}/{gridX},{gridY}/forecast

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2) OpenWeather

• Best for: Global weather apps with easy integration
• Coverage: Global
• Features:
  • Current weather
  • Hourly/daily forecasts
  • Weather alerts in some plans/regions
• Docs: https://openweathermap.org/api
• Pros: Easy to use, popular, good SDK support
• Cons: Alerts and advanced forecast features may require paid tiers

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3) WeatherAPI.com

• Best for: Simple global forecasts and alerts
• Coverage: Global
• Features:
  • Current conditions
  • Forecasts
  • Alerts
  • Astronomy, air quality
• Docs: https://www.weatherapi.com/docs/
• Pros: Straightforward JSON, easy integration
• Cons: Alerts/forecast depth depends on plan

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4) Tomorrow.io

• Best for: High-quality forecast data and severe weather alerts
• Coverage: Global
• Features:
  • Minute/hourly/daily forecasts
  • Severe weather alerts
  • Radar and weather intelligence
• Docs: https://docs.tomorrow.io/
• Pros: Rich data, developer-friendly
• Cons: Many useful features are paid

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5) Meteomatics

• Best for: Enterprise-grade weather data
• Coverage: Global
• Features:
  • Forecasts
  • Alerts
  • Historical weather
  • Specialized meteorological data
• Docs: https://www.meteomatics.com/en/api/
• Pros: Very powerful and precise
• Cons: More complex, enterprise pricing

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Recommendation

• If you need free U.S. alerts/forecasting: use NOAA/NWS
• If you need global and easy-to-integrate: use OpenWeather or WeatherAPI
• If you need stronger forecast intelligence: use Tomorrow.io

If you want, I can also give you:

1. a comparison table,
2. sample API requests, or
3. a Python/JavaScript example for one of these APIs.