After last night's dust storm, there is lingering lofted dust over portions of the Phoenix area this morning and thus some elevated hourly readings can be expected this morning. However, afternoon winds will have a clearing effect. Also, storm activity over southern Arizona later today is expected to be quite a bit less than yesterday and so another dust storm is not expected tonight. Thus, the 24 hour average PM10 today is expected to be in the lower Moderate range. Of note, there may be some gusty winds from the north later today, but those would be much less effective at producing blowing dust. In general, storm activity over the next few days is expected to be primarily over northern Arizona which will limit blowing dust potential over the Phoenix area. There may be an uptick in storm coverage over southeast AZ later in the workweek. But at this time, uncertainty in how that will play out will preclude pinpointing any blowing dust episodes for the late week time frame. For now, anticipate largely routine conditions with a short lived period of elevated hourly readings in the morning (associated with local activities such as construction) before the inversion breaks and better ventilation develops. 24 hour average PM2.5 values will follow a similar pattern but be in the Good range.

Peak 8 hour average Ozone values took a dip on Sunday and will start to rebound today but are expected to fall a bit short of Advisory thresholds. However, the upward trend will continue Tuesday with values reaching the Unhealthy for Sensitive Groups category. This is expected to continue the rest of the workweek (but with subtle improvement on Friday) and so the High Pollution Watch for Tuesday has been converted to a High Pollution Advisory; the High Pollution Watch remains in effect for Wednesday through Friday.

- A. Jamison
ADEQ Meteorologist