Over the next couple days, high pressure centered roughly over the western tip of Texas will try to press into Arizona. It will reach far enough to cause the Valley's high temperatures to hover over 110°F. The National Weather Service even has an Extreme Heat Warning out for Wednesday and Thursday. However, by the end of the week, a large low-pressure wave will advance into the region and push the high pressure eastward, thereby "cooling" temperatures and increasing daytime breezes.

Air quality-wise, ozone is forecast to be highest today because of the high pressure overhead. Then, as wind gradually increase over the next few days, ozone levels are forecast to trend downwards. Ozone may even drop into the Good AQI category by Saturday. Time will tell!

As for PM10 (dust) and PM2.5 (smoke), both of these pollutants will remain mostly locally driven in the mornings. Their hourly forecast graphs generally reflect activity in industrial areas south/southwest of the Phoenix metro area. But, we can't rule out pockets of dust from dust-prone areas on breezier days later in the week.

Check back tomorrow morning for the next update!

- M. Graves
ADEQ Meteorologist