nal Outlook for March 20-21
MODERATE Air Quality levels in the East and West
Friday, March 20 – Saturday, March 21: In the
East, surface high pressure moving over the Great Lakes will produce
light and variable winds over Michigan, Indiana, and Ohio, limiting
pollutant dispersion and causing Air Quality levels to be Code Yellow: MODERATE
over portions of those states on Saturday. The same high-pressure
system will produce moderate southerly winds over Wisconsin and
Minnesota on Friday and Saturday, transporting pollutants and
moisture into the region. These conditions will enhance particle
formation, leading to Code Yellow: MODERATE
Air Quality levels in those states as well.
Farther south, an upper-level ridge of high pressure will limit
vertical mixing over the southern Plains, trapping pollutants near
the surface. Furthermore, mostly sunny skies and warm temperatures
will enhance ozone production. As a result of these weather
conditions, Air Quality levels will be Code Yellow: MODERATE
in parts of Oklahoma, Texas, and Missouri.
In the West, light winds and cool overnight temperatures will
limit dispersion and allow overnight temperature inversions to form,
limiting vertical mixing and causing pollutant levels to increase.
In addition, sunny skies and warm daytime temperatures will aid
ozone formation. Therefore, Air Quality levels are expected to be
MODERATE in portions of central and southern California, Las
Vegas, NV, and Phoenix, AZ.
air quality for US Cities