NOAA's High Resolution Rapid Refresh smoke model generates forecast maps of smoke density over the continental United States.
The model runs every 6 hours, at 00:00, 06:00, 12:00, and 18:00 UTC (that's 5 AM, 11 AM, 5 PM, and 11 PM, for you folks in the smoky PDT time zone). The forecast covers the coming 37 hours, with one map for each hour. It takes about 5 hours of computer time to produce all 37 hours of the forecast, so if you check shortly after the 6-hourly updates you'll see only the first few hours of forecasts.
Pick your favorite region:
Western Continental US
Northwest Continental US
North Central Continental US
Northeast Continental US
Southwest Continental US
South Central Continental US
Southeast Continental US
WA and northern OR
Scroll down to the "near-surface smoke" row.
Click the checkmark under "All times" to display forecast maps for the next 37 hours (or as many as have been completed by the computer).
Or, click the checkmark under "Loop" to display all the forecast maps in an animated loop.