Tuesday, August 18, 2015
Issued on August 18, 2015
Shasta-Trinity
& Six Rivers Complexes Mike Broughton & Jen Croft
Smoke Impact Report –
Shasta-Trinity/Six Rivers National Forest August 18, 2015.
A)
Fire
growth
Complex Names
|
Fire
Growth Yesterday
|
Total
Acre
|
Fork
Complex
|
1047 Acres
|
34,403 Acres
|
Mad
River Complex
|
2626 Acres
|
24,831 Acres
|
River
Complex
|
3704 Acres
|
43,149 Acres
|
Route
Complex
|
2626 Acres
|
31,487 Acres
|
South
Complex
|
671 Acres
|
21,629 Acres
|
Gasquet
Complex
|
1614
Acres
|
6,465 Acres
|
Nickowtiz
Fires
|
447 Acres
|
3,302 Acres
|
Total
|
10,870 Acres
|
161,194 Acres
|
Information came from Infrared Flights
B)
Weather
High
pressure is continues to dominate Northern California today and tomorrow. As a result, transport wind speed is very
weak. A weak upper level trough will
move through the area Wednesday evening through Friday. Smoke dispersion may be improved slightly
then.
C)
Fire
Behavior
Fire Behavior Analysts at the Complexes are
predicting excellent burn conditions as the inversion breaks. Short range spotting may increase as the weak
disturbance allows for column lifting.
D)
Smoke
Combined fire growth in the Tri-County area
was the largest to date, contributing to poor air quality conditions across the
area. Consideration for sensitive
groups, extended exposure times, and activity levels for those within the
hazardous forecast zones should be made.
Smoke dispersion will be limited today, with some relief tomorrow as the
weak transport winds approach. Air
quality is not likely to improve until later in the week, especially in the
Tri-County area.
Weak
Northwesterly transport wind pushes smoke to the Southeast today and tomorrow (Figures
1,3). Overnight, smoke is likely to
settle down in river drainages, but is pushed slightly to the west (Figures 2,4). The displayed model runs did not cover fires
in Southern Oregon. With a southerly flow,
Crescent City, Gasquet, Happy Camp, Yreka, Etna and Mt. Shasta may be impacted
by smoke from these fires that are not included in this particular model
run.
Figure
1: Bluesky run for 6pm on August 18,
2015.
Figure
2: Bluesky run for 6am on August 19, 2015
Forecast conditions
represent impacts from smoke.
Contributions from ozone and other pollutants are not reflected.
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AQI Index
|
Actions to Protect Yourself
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Good
|
None
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Moderate
|
Unusually
sensitive people should consider reducing prolonged or heavy outdoor
exertion.
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Unhealthy
for Sensitive Groups - USG
|
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
|
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
|
Everyone should avoid any outdoor exertion; people with
respiratory or heart disease, the elderly and children should remain indoors.
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Hazardous
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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
|
Links:
Siskiyou County APCD - http://www.co.siskiyou.ca.us/content/agriculture-air-pollution-control-district
Wildfire Smoke – A Guide for Public Health Official from California Air Resource Board
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