According to the HMS analysis team, remnant smoke from fires in northern California continues to traverse northward towards eastern Oregon, yet is not significantly impacting air quality as PM2.5 AQI conditions remained in the Good to Moderate range. Elsewhere, smoke believed to have originated from the numerous fires in Canada may be contributing to poor air quality conditions over the Central Plains and Great Lake states as Moderate to Unhealthy for Sensitive Groups PM2.5 AQI were reached today (bottom left: courtesy HMS, right: courtesy AIRNow). The heaviest smoke as mentioned in previous posts, remains in Canada, stretching over a large horizontal swath from British Columbia through Ontario. Due to persistent cloud cover along the Great Lakes- Canadian border, it is difficult to observe how far southeast this smoke extends. Numerical Weather Prediction models forecast an atmospheric trough to dig further south by mid-week, thus allowing for unfavorable steering flow for smoke southeast bound towards Great Lakes and Northeast.
Surface ozone was also a problem for the Central Plains and Great Lake states, climbing to Unhealthy for Sensitive Groups and Unhealthy levels. Late afternoon (19:15 UTC) GOES-EAST visible satellite imagery alludes to possible contributors for the raised ozone conditions, indicating weak, warm, southerly flow and a stalled frontal boundary over the area (bottom left:courtesy AIRNow, bottom right: courtesy NOAA)