| A complex low-pressure system will progress
slowly eastward from the Canadian prairies into Ontario over the next few
days. Scattered or even widespread
rain showers will develop over Oklahoma again on Saturday as a cold front
passes or stalls. This active pattern
ensures mostly good air quality.
Behind the front with the thermal inversion, a dry Canadian air mass
and mostly sunny skies may foster moderate ozone downwind of urban areas, but
southerly winds will return quickly and restore a moist tropical air mass and
isolated rain showers. |