Flows from north and northwest are
dominant at the monitoring station. During the warm
season, the migration of the jet stream to more northerly latitudes results
in more frequent transport of warmer moist air from the Gulf of Mexico and
warm dry air from the southwestern U.S.
Figure 1. Normalized
residence in January (left) and July (right)
Figure 2. Normalized residence in 20% best
(left) and 20%
worst (right) visibility days.
Although north and northwesterly flows are
generally dominant at the site, flows from east and southeast of the site
are often associated with worst visibility days as shown in Figure 2. Figure
3 and 4 also indicate that flows are more frequently from east of the site
during the worst sulfate and organic days.
Figure 3. Difference (left)
and ratio (right) of normalized residence time in 20% worst sulfate days and all
days
Figure
4. Difference (left)
and ratio (right) of normalized residence time in 20% worst OC days and all
days
For an in depth discussion on the role of meteorology
at the Northern Cheyenne see the Meteorological
Discussion section.
