Study Notes on Wildfires and Drought

Wildfires and Drought Overview

• Wildfire Vulnerability: Areas with cleared vegetation are more prone to wildfires.

• Wildfires in Canada (2023): 120 fires caused by lightning in one day under warm, dry conditions; National Preparedness Level at 5 for 119 days.

National Preparedness Levels

• Level 1: Low fire danger.

• Level 5: Extreme fire danger, inadequate resources.

Heat Waves

• Definition: Abnormally hot conditions lasting days/weeks.

• Historical Events: 1995 Chicago heat wave led to 739 deaths; 2003 Europe heat wave resulted in 70,000 deaths.

• Impact of Heat Waves: Related to climatological averages; warnings issued based on consecutive days of heat.

Urban Heat Islands

• Characteristics: Urban areas can be 3-5°C hotter than surrounding areas, impacting poor communities with less greenery.

• Mitigation: Increasing vegetation and implementing green roofs can reduce temperatures in urban areas.

Drought Dynamics

• Definition: Drought is a freshwater deficiency relative to normal water availability.

• Types of Drought:

  • Meteorological: Precipitation below normal for extended periods.

  • Agricultural: Low soil moisture affecting crops.

  • Hydrological: Insufficient water in lakes and streams.

Socioeconomic and Megadroughts

• Socioeconomic Impact: Water shortages can lead to reduced goods and services.

• Megadrought: Drought lasting two decades or more, severely impacts livelihood.

Global Drought Impacts

• Historically devastating in Southern Asia, China, and Northeastern Africa. Drought leads to fatalities, displacements, and conflicts.

Monsoonal Drought Conditions

• Characteristics: Drought occurs if rainfall drops in monsoonal climates; risks famine in densely populated regions.

• Example: India's drought and wet years illustrated with relative averages.