Surface Winds During an Intense Outbreak of Arctic Air in
Southwestern British Columbia
Peter L. Jackson
Atmos. Ocean, 34, 285-311, 1996.
An outbreak of arctic air which occurred from January 30 to February 2
1989, plunging southwestern British Columbia (as well as most of western
North America) into extreme cold is examined, and put in context by
reference to similar events reported in the literature. Emphasis is placed
on the resulting wind fields in Howe Sound and the Lower Fraser Valley.
The wind speed in these topographically confined channels during arctic
outbreaks is found to be related to the down-channel pressure gradient.
Three simple steady-state models of wind speed are suggested whose results
are compared to observed winds. It is found that the Friction
model, representing a balance between friction, acceleration, and
horizontal pressure gradient, compares best with observations in the Lower
Fraser Valley. Hydmod, a hydraulic model of wind flow performs
reasonably well, with previous work indicating it produces more realistic
along channel flow variability in Howe Sound.