Weather

These are official hazard products with escalating urgency. Watches indicate favorable conditions, Warnings signal imminent or occurring hazards, and Advisories cover significant but less severe impacts.

Observation-based alerts trigger from current/near-real-time data, while forecast-based alerts trigger from predicted conditions. Use observations for immediate risk and forecasts for planning windows.

It reflects apparent temperature considering humidity, wind, and other factors (heat index or wind chill). It often better represents human-perceived risk than air temperature alone.