GBUAPCD Air Blog

Dust and smoke issues in the Great Basin Unified Air Pollution Control District

Hodgdon Rx burn in Yosemite

Posted by admin on June 21, 2012

Starting on Tuesday, June 19, 2012, Yosemite National Park has been performing the Hodgdon Rx (prescribed) burn 1/2 mile east of the Oak Flat entrance to the Park on State Route 120 in Tuolumne County.

The 234 acre burn has been broken down into the following amounts per day:

Total burned 06/19/2012: 70 acres (on a “Fair” burn day in South Mountain Counties Air Basin and a “Marginal” day in the Great Basin Valleys Air Basin)

Total burned 06/20/2012: 134 acres (on a “Fair” burn day in South Mountain Counties Air Basin and a “Burn” day in the Great Basin Valleys Air Basin)

Total  acres left to burn on 06/21/2012: 30 acres. Fire Managers are forecasting this project to  be completed by mid-day. (on a “Good” burn day in South Mountain Counties Air Basin and a “Burn” day in the Great Basin Valleys Air Basin)

The Mono Basin and Owens Valley have seen moderate increases in particulate matter at times on all three days.   The prevailing winds were toward both of these locations from the burn and the lightness of local winds rules out windblown dust as a source of the elevated particulate concentrations.  Visibility impairment in the Great Basin Valleys has been most apparent around sunrise and sunset.  Below are views from Tuesday and Wednesday afternoons from the Park’s Crane Flat webcam facing northwest toward the burn.  On both days, the smoke seemed to be travelling northeast without getting much lift (mixing height) on the “fair” burn days.  Dispersion conditions are, however, improving for the next several days.

 

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