Atmosphere-fire motions are inseparable,
with varying degrees of coupling.
This fire-atmosphere interaction shows itself on a range
of scales:
- small-scale: intense winds within the fire
- boundary layer: fire-indeced downdrafts
- depth of entire troposphere: hail-forming pyrocumulous
|
Atmosphic wind and temperature structure can have
a big impact on fire bahavior::
- Variability in near-surface atmospheric stability and
winds affected whether/how fire spilled over a ridge
Conversely, fire-induced winds are also a crucial factor
in fire development:
- Some conditions can lead to blowups with rapid intensification
of spread rate and heat output
- Fire winds dominate their surroundings
Symmetric fires can become asymmetric, i.e. left
or right flank of fire may take off.
Similar to real fires, when crossing a ridge, modeled
fires stall, spillover, back down, or veer in either direction,
sometimes with "escapes". |
