Trend effects on perceived avalanche hazard.

Area of Science:

• Risk communication
• Psychology of risk perception
• Natural hazard forecasting

Background:

• Hazard-level forecasts are crucial for mitigating risks to life and economy.
• Avalanche forecasts commonly use color-coded scales to communicate risk levels to the public.
• Understanding how forecast information influences risk perception is vital for effective communication.

Purpose of the Study:

• To investigate if irrelevant past trends in avalanche danger forecasts affect perceptions of current and future risk.
• To determine how different populations interpret historical forecast data.
• To assess the impact of trend information on risk communication effectiveness.

Main Methods:

• Conducted three experiments with participants from populations targeted by national avalanche warning services.
• Tested the influence of irrelevant past trends in forecasted avalanche danger on risk perception.
• Compared perceptions of current and future avalanche risk under different trend conditions.

Main Results:

• Perceptions of avalanche risk were significantly influenced by past trends.
• Future avalanche risk was extrapolated in the direction of the previous day's trend.
• Perceived current risk appeared to be an average of past and current danger levels.
• These effects lessened when participants received exact danger level scales, but often remained significant.

Conclusions:

• The public may overemphasize historical information in avalanche forecasts, potentially misinterpreting current and future risks.
• Risk communication strategies, including the presentation of historical data, need careful consideration.
• Findings have implications for improving the clarity and effectiveness of avalanche warning services and general risk communication.