This type of
inversion develops when a widespread layer of air descends, compresses, and
heats due to increasing atmospheric pressure.
These inversions typically occur at night and, as a result, temperatures
increase and humidity decreases to 15-20 percent. During the dry period,
lichens and small ground fuels dry out, leading to potential increased fire
activity.
Firefighters
at the Mt Adams Complex have been preparing for the impacts of the inversion by
steadily mopping up the perimeters of the Riley and Horseshoe Fires and
extinguishing hot spots identified by palm infrared (IR) heat-detection devices
and IR flights. A spot fire near the Riley Fire has been contained.
Fire officials
reported today that the Horseshoe Fire has been “put to bed” but they are monitoring
it closely to observe its reaction to the inversion and increasingly warm
weather predicted for next week.
On the Riley
Fire, firefighters continue to mop up and monitor the fire activities from
lookouts near the fire. Initial attack
crews are ready to respond to any new fires or spotting that might occur later
today as winds produce gusts up to 30 miles per hour. Lower humidity and wind
will increase interior consumption of remaining, unburned areas inside the fire
perimeter. Fire officials are confident
that the mop-up of the fire perimeter will prevent the fire from growing
larger.
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