Yosemite National Park
Prepared: 10/03/16 Prepared by: Jim McNitt, Air Resource Specialist
Overview: The 2016 Mariposa Grove prescribed fire project is comprised
of 148 acres and is divided into six segments, four of which are in the
northern part of the grove and two in the southern part. By maintaining fire in
the Mariposa Grove, both fuels reduction and ecological goals can be
achieved. Periodic fire occurrence plays
a key role in the health and regeneration of giant sequoia. The Mariposa Grove
is closed to the public until Spring 2017 for the Mariposa Grove
restoration project. Operations Summary:
Ignitions started on Sunday, 10/2/16 and 31 acres were burned in the lower grove. The fire is being
monitored today and mop up operations will continue through the week. Smoke Synopsis: Smoke transport and
dispersion was excellent yesterday. It is good today and will be fair tonight. Smoke
production today is light. Expect smoke transport and dispersion tomorrow to be
good in the afternoon and poor at night. Smoke will be transported to the east today
during the day and downslope to the southwest overnight settling in drainages by
the early morning. Smoke will be transported to the east during the afternoon on
Tuesday. Outlook: A dry, cool northwesterly
flow aloft is expected to continue through Wednesday. Moderate high pressure is
expected to build in by Thursday.
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Location
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Day 1
10/2/16
Observed*
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Day 2
10/3/16 Forecasted |
Day 3
10/4/16
Forecasted
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Details for avoiding smoke during
the worst hours of the day. Ignitions were conducted on Day 1.
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Wawona
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Good
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Moderate
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Moderate
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Smoke from the Lakes Fire and Mariposa Grove will flow downslope
overnight and settle in drainages by the early morning. People with heart or
lung disease, children and older adults should reduce prolonged or heavy
outdoor exertion. Highest levels of PM2.5 will be between 4 AM and 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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Good
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Good
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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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Air Districts: http://www.arb.ca.gov/capcoa/roster.htm AirNow (AQI forecasts and nowcasts): https://www.airnow.gov
Yosemite Fire Information and Updates:
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