Normal
Flirting
Red Flag
Get notified when weather stations near a location flip into Red Flag or Flirting conditions. Works with any location — city, county, facility, or address.
Defaults reflect California's standard fire weather criteria. Flirting is within 5% RH and 5 mph of both thresholds. Criteria vary by region — adjust above to match your local WFO.
A map-first fire weather dashboard covering the United States and its territories, including Alaska, Hawaii, Puerto Rico, Guam, and other US territories. It displays current observations from RAWS and ASOS stations, color-coded by fire weather severity. The Alerts feature lets you define a watch zone around any location and receive browser notifications when nearby stations flip into Red Flag or Flirting conditions. Station counts reflect what's currently in view.
Station observations are fetched from the Synoptic Data API, which aggregates real-time data from RAWS (Remote Automated Weather Stations) and ASOS (Automated Surface Observing Systems) stations. Data is cached at the edge and refreshed every 10 minutes.
The Severity Index (SI) is computed using the formula published by the National Weather Service:
SI = Wind + 0.75 × (50 − RH) + 0.50 × (T − 70)
Wind is the higher of sustained wind speed and gust (mph), RH is relative humidity (%), and T is temperature (°F). The minimum value is 0. A score of 30 is considered significant; 100 is about as bad as it gets.
Red Flag conditions are flagged when RH and wind simultaneously meet the configured thresholds. Flirting stations are within 5% RH and 5 mph of both thresholds at the same time. The default thresholds (RH ≤ 20%, wind ≥ 15 mph) reflect California's standard fire weather criteria. Official criteria vary by NWS forecast office — use the Settings panel to match your local WFO. Actual Red Flag Warnings may also incorporate fuel moisture, forecast trends, and other factors.
This is an unofficial situational awareness tool. It is not affiliated with or endorsed by the National Weather Service, NOAA, CAL FIRE, or any fire agency. Always refer to official NWS products and your agency's operational channels for fire weather decisions.
Snoopy is free to use. If it's useful to you, buying me a coffee helps cover the cost of running it.