Humidity values dropped below 15 percent across many areas of western Montana with some areas even in single digit percentages. Fire danger has been upgraded to the very high rating across much of the western half of Montana.
Some areas such as parts of Madison County and the southern Bitterroot Mountains are now at an extreme fire danger rating.
Low humidity dries out fire fuels such as brush and downed trees. The drier these fuels are, the more likely they are to burn. Expect the humidity to come back toward normal levels on Thursday as monsoon winds move into the area.