Heavy or torrential rains can cause flash flooding of streets, creeks, and streams.
November 21, 2025
high
hazard
Flash flooding is a common hazard associated with intense rainfall and can affect urban and natural drainage channels.
Areas of land burned by recent wildfires (burn scar areas) have increased susceptibility to debris flows and flash flooding during heavy rainfall.
November 15, 2025
high
process
Loss of vegetation and changes to soil properties after wildfires reduce slope stability and increase runoff, raising the risk of debris flows and flash floods when heavy rain occurs.
Slow-moving tropical cyclones can produce prolonged heavy rainfall that increases the risk of catastrophic flash flooding and landslides in affected areas.
October 25, 2025
high
temporal
Meteorological behavior of slow-moving hurricanes and tropical cyclones
Warm sea surface temperatures combined with slow-moving tropical cyclones can promote rapid intensification and produce very heavy rainfall, which increases the risk of life-threatening flash flooding and landslides.
October 23, 2025
high
scientific
General meteorological principle about factors that favor hurricane intensification and related hazards.
Outer bands of hurricanes can produce heavy rainfall that increases the risk of flash flooding in impacted regions.
high
process
Hydrological impacts of tropical cyclone rainbands on vulnerable areas.