Closing in 59...

Welcome to the 303 LIFE - Fire Hazard Indicator

This tutorial explains the 30-30-30 fire danger rule, why it matters, and how different regions apply it. Follow the steps to build your knowledge progressively.

Step 1: Learn the Basics

The 30-30-30 rule is a simple indicator of extreme fire danger:

  • Temperature ≥ 30°C → fuels dry rapidly.
  • Relative Humidity ≤ 30% → fuels lose moisture, ignition spreads faster.
  • Wind Speed ≥ 30 km/h → flames intensify, embers travel far.
  • fire conditions

When all three occur together, fires often become uncontrollable.

Step 2: Understand Why It Matters

When Fire under 30-30-30 conditions:

  • Fire suppression is nearly impossible.
  • Evacuation becomes the first priority, unless you sure you will be SAVE to stay inside the building, try to escape if possible, because there is nothing much fire fighter can do, the decsion may become not let it spreads faster, but just let it burn till the end.
Think of 30-30-30 as a public warning shorthand. Professionals use detailed indices, but this rule helps communities grasp risk quickly.

Step 3: How to USE?

This step explains how the danger indicators work in practice and how alerts should behave:

  • Single Trigger: If any one of the three indicators (temperature, humidity, wind) enters the danger zone, the system will activate an alert sound and flashing light as the first warning.
  • Alert system example
  • Data Updates: The page automatically checks official government fire‑weather data every 10 minutes to stay current.
  • User Controls: You can mute the sound or acknowledge the alert to temporarily silence it. The system will re‑activate if new danger conditions are detected.
  • Multiple Triggers: If two or more indicators reach the danger zone at the same time, the entire background will flash continuously to signal a serious alert that requires immediate attention.
  • Alert example

Global Adoption & References

Different regions use the rule or similar thresholds. The table below now includes the year of adoption or popularization:

Region Use Year of Adoption / Popularization Trigger Events Notes
Canada Explicit 30‑30‑30 rule in public wildfire messaging 2018–2020 (popularized), widely publicized by 2024 Fort McMurray 2016, BC fires 2017–2018 Shorthand for public alerts; based on Fire Weather Index
United States NFDRS & Red Flag Warnings (similar criteria) NFDRS: 1972; Red Flag criteria standardized in 1980s Great Fire of 1910, Yellowstone 1988 No 30‑30‑30 phrase; thresholds vary by state
Australia Forest Fire Danger Index (FFDI) 1967 (FFDI formalized), national adoption by 1990s Black Friday 1939, Ash Wednesday 1983, Black Saturday 2009 Uses “Catastrophic” ratings tied to FFDI thresholds
Europe (Spain, Portugal, Greece) EFFIS & national indices EFFIS launched 1998; national systems matured 2000s–2010s Portugal 2003, Greece 2007, Spain 2017–2024 Adapted Canadian Fire Weather Index; no 30‑30‑30 term
Asia (Indonesia, China, India, Thailand) FAO-supported fire danger systems 2000s onward (regional adoption varies) Indonesia haze 1997, Siberian fires 2019–2020 Humidity, wind, and drought indices used; no 30‑30‑30 shorthand

Dive Deeper with References

Explore official resources for more detail:

Terms of Use & Disclaimer

Acknowledgment: By using this dashboard, you acknowledge and agree to the following terms:

Data Source: All meteorological data (Temperature, Humidity, Wind Speed) is retrieved directly from the Government Weather Department API. The developer has no control over the availability, latency, or accuracy of this external data.

Liability: This tool is intended for informational and educational purposes only. The developer assumes no responsibility or liability for any errors, omissions, or false displays in the data, nor for any damages, accidents, or losses resulting from the use of this system. Users should verify critical conditions with official government sources.

Close
Theme Mode
Alert Sound

303 LIFE - Fire Hazard Indicator

30-30-30 Rule

Humidity 濕度
--%
LOW RISK
MODERATE
EXTREME DANGER
Max. Gust 最大陣風
-- km/h
LOW RISK
MODERATE
EXTREME DANGER
Temperature 溫度
Location: --
--°C
LOW RISK
MODERATE
EXTREME DANGER
Time: --
Last Update: -- 🔄
Copyright and Created by Tony HM LEUNG All Rights Reserved
↓ Scroll down for HKO Weather Warnings ↓
↑ Scroll up for 303 LIFE - Fire Hazard Indicator ↑

HKO Weather Warnings

Loading English Weather Warnings... 正在載入天文台天氣警告...