Dust Risk-Based Forecast | Pinal County

Friday

Stagnation: Moderate stagnation

Wind: Light winds becoming west 4-10 mph

Saturday

Stagnation: Light stagnation

Wind: Light winds becoming west 5-12 mph

Sunday

Stagnation: Moderate stagnation

Wind: Light becoming west 4-9 mph

Monday

Stagnation: Moderate stagnation

Wind: Light winds

Tuesday

Stagnation: Moderate stagnation

Wind: Light winds

Forecast Discussion:

High pressure overhead today will result in tranquil weather conditions for the local area. This morning's temperature inversion is helping trap locally generated dust close to the ground and bringing elevated concentrations to Hidden Valley. The Hidden Valley PM10 monitor is forecast to exceed the health standard today and again on Friday due to the local dust generating activities and the rather stagnant conditions. The high pressure will eventually weaken and move to the east. An upper level low pressure system is forecast to form off of the California coast and move southward down off the Baja California coast where it will eventually stall and retrograde (i.e. move in the opposite direction, west) off the Baja California coast this weekend. Another ridge of high pressure is forecast for early next week. The forecasted morning conditions for Monday at Hidden Valley are ominous from a high PM10 concentration perspective. The calm to light easterly winds forecast for Monday along with the typically elevated weekday dust causing activities may result in PM10 concentrations that approach the Unhealthy AQI category! The dust risk forecasts are in the high category for Friday and next Monday and Tuesday with moderate dust risks forecast for the weekend. Check back tomorrow for an updated dust risk forecast.

- S.DiBiase
Pinal County Air Quality Meteorologist