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Rattlesnake Fire

Unit Information

Sequoia & Kings Canyon National Parks
National Park Service
47050 Generals Highway
Three Rivers, CA 93271

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Air Quality and Smoke Report 9/18/2020

Rattlesnake Fire Wildfire
Announcements – 9/18/2020

Yesterday was an active fire day. Current size is 128,902
acres. New fire growth was 6,067 acres & containment
remains at 12%. With a very poor humidity recovery last night
and today’s strong afternoon West-Southwest ridge winds, fire
activity is going to start late (early afternoon). Light morning
winds, a smoke blanket, & cloud cover will keep fire activity
moderate in the AM. Today fire activity will be very active in
the afternoon until late evening when humidity rises to its best
levels for this fire. Saturday presents similar conditions with
the exception ridge winds are not as strong. The Southern
perimeter held as new smokes appeared. The Eastern
perimeter became more active & is still checked. The Western
perimeter priority is still point protection & structure defense
and timely burnouts. Fire info, visit

Yesterday, the air quality was Unhealthy to Hazardous. The
morning smoke levels will not lower until the afternoon strong
West-Southwest ridge winds appear. Tonight all impacted
drainages will collect smoke at higher levels as cooler night
temperatures & humidity increase fuel smoldering. Saturday
brings again West-Southwest ridge winds. This will continue to
lower smoke levels in San Joaquin Valley and Sierra Foothills.

Special Note
Smoke Outlook reflects particulate matter impacts on air
quality. Review your closest monitoring station when planning
outdoor activities. Air quality may change unexpectedly. If you
begin to notice health effects from smoke, you are encouraged
to follow the "actions to protect yourself" listed below.

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