A low pressure system will bring scattered to numerous showers and thunderstorms to southeast Arizona this afternoon along with breezy to windy conditions. A follow-on system will bring a slight chance of showers to the higher mountains Saturday. Dry conditions are expected Sunday and Monday. Another weather system brings rainfall to much of the state on Tuesday.

Daily average PM10 (dust) levels yesterday were in the lower part of the Moderate range. Today's average is anticipated to be better and fall within the Good category due to rainfall (mainly this afternoon). Daily averages will increase slowly over the next few days just reaching the Moderate category Monday due to dry conditions and lighter winds (still breezy at times Saturday). Tuesday is anticipated to dip into the upper Good range Tuesday aided by light rainfall in the afternoon and evening.

Yesterday, the daily average PM2.5 (smoke/combustion particles) value was in the Moderate range. Some improvement is anticipated today due to the expected afternoon rainfall. But, local weekend evening activities are anticipated to offset that a bit and keep readings in the low Moderate range. Anticipate a continuation of daily averages in the low Moderate range through Monday before dipping into the upper Good range Tuesday.

- A. Jamison
ADEQ Meteorologist