1. High Wind Blowing Dust March 30, 2010 Exceptional Event
Monitored Exceedances in Northern Utah – Wasatch Front

2. Description of Event Dust plumes in Southwest
Dessert moving towards Salt Lake City
Southern wind ahead of a low pressure front that was moving into Utah from the northwest generated gusting winds clocked at
109 mph at Signal Mountain near St. George, 80 mph were reported at Ogden Peak, Sundance, Snowbasin and Cardiff Peak.

3. Temporal Extent

4. Temporal Extent

5. Exceptional Event?

6. Exceptional Event?

7. Conclusions
The natural dust event was not reasonably controllable or preventable;
The measured concentrations are beyond normal historical levels;
There is a clear-causal connection between the high wind event and the exceedance at the monitoring station network; and
The exceedance would not have occurred “but for” the high winds.