The National Weather Service has issued Red Flag Warnings for elevated wildfire danger on July 18, 2019 for areas of Colorado, Wyoming, Utah, Oregon, and Washington. As you can see on the map most of them expire Thursday night, with the exception of the warning in northwest Colorado that is in effect until 9 p.m. Friday.
The forecasts for these areas include strong winds and low humidity.
(Red Flag Warnings can be modified throughout the day as NWS offices around the country update and revise their weather forecasts.)