True or False: Foehn winds cause fuels to gain in moisture content.

Foehn winds, which are warm, dry winds that descend the leeward side of mountains, typically lead to a decrease in moisture content in fuels. These winds are associated with the process of adiabatic heating; as the air descends, it warms up and lowers its humidity. This increase in temperature combined with reduced humidity causes surrounding vegetation and surface fuels to dry out.

In wildland fire behavior, dry fuels are more susceptible to ignition and can support more intense fire spread. Therefore, the statement that Foehn winds cause fuels to gain in moisture content is false. Instead, these winds contribute to drier conditions which enhance fire risk.