Prepared: 10/22/16 Prepared by: Jim McNitt, Air Resource Specialist
Overview: The 2016 Mariposa Grove prescribed fire project is comprised of 148 acres. By maintaining fire in the Mariposa Grove, both fuels reduction and ecological goals can be achieved. The Mariposa Grove is closed to the public for the Mariposa Grove restoration project. Operations Summary: Ignitions started on Sunday, 10/2/16 when 31 acres were burned. Another 44 acres were burned on 10/12/16 – 10/13/16. An additional 55 acres of ignitions are planned for today and tomorrow. Smoke Synopsis: Smoke transport and dispersion will be fair to good today and poor at night. Smoke will be transported to the north during the day on Saturday and Sunday. Some smoke will settle in the Wawona area tonight under a surface temperature inversion. Outlook: An upper trough deepening off the West Coast will bring stronger winds and increased vertical mixing tomorrow.
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Location
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10/21/16
Observed*
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Day 1
10/22/16 Forecasted |
Day 2
10/23/16
Forecasted
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Details for avoiding smoke during
the worst hours of the day. Ignitions are planned for Day 1.
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Wawona
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Good
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Good
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Moderate
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Smoke could flow down the
South Fork Merced River overnight and settle in Wawona by the early morning. People
with heart or lung disease, childrern and older adults should reduce
prolonged or heavy outdoor exertion. Highest levels of PM2.5 will be between 2
AM and noon. Smoke will disperse as the temperature inversion breaks down (by
noon).
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El Portal
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Good
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Good
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Good
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Yosemite Valley
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Moderate
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Moderate
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Moderate
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Campfire
smoke and any smoke from wildland fires will be trapped under a surface
inversion overnight. The highest hourly readings will be between 10 PM and 6
AM.
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Disclaimer: These predictions are based on anticipated
weather and fire activity. Air quality predictions reflect only fine
particulate matter (PM2.5).
If you experience health impacts from smoke, contact your health
professional. *The Air Quality Index (AQI) values used
to create the table are 24-hr averages (midnight-midnight local time) of data
from automated instruments. The data have not been subjected to a quality
assurance review.
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AQI Category
(PM2.5 µg/m3) |
Potential Health Impacts
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Actions to Protect Yourself
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Good (0-12)
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Little or no health risk
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None
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Moderate (13-35)
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Air quality is acceptable
for most. There may be moderate health concern for a small number of
sensitive people.
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Unusually sensitive
people should consider reducing prolonged or heavy outdoor exertion.
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Unhealthy for Sensitive
Groups – USG (36-55)
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Members of sensitive
groups may experience health effects.
The general public is not likely to be affected.
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People with heart or lung
disease, children and older adults should reduce prolonged or heavy outdoor
exertion. Everyone else should limit
prolonged or heavy exertion.
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Unhealthy (56-150)
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Everyone may begin to
experience more serious health effects.
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The following groups
should avoid all physical outdoor activity: People with heart or lung
disease, children and older adults.
Everyone else should avoid prolonged or heavy exertion.
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Very Unhealthy
(151-250)
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Triggers a health alert, everyone may experience more serious
health effects
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Everyone should avoid any outdoor exertion; people with
respiratory or heart disease, the elderly and children should remain indoors.
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Hazardous (>250)
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The entire population is even more likely to be affected by
serious health effects.
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The following groups should remain indoors and keep activity
levels low: People with heart or lung disease; children and older adults.
Everyone else should avoid prolonged or heavy exertion
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