A large ridge of high pressure aloft over the Northwest has lead to very stagnant air and poor air quality over the last couple of weeks. People with respiratory issues will need to monitor the forecast. Here is the very latest:
The poor air quality continues over areas of Washington, Oregon and Idaho with Air Stagnation Advisories in effect. Cities like Medford, Boise and Yakima will need to pay extra attention to any outdoor activities. This is especially true for those that have respiratory issues.
High pressure once again dominates the weather pattern in the Northwest. The high has been responsible for very little mixing in the atmosphere, leading to the poor air quality conditions. Valleys will be most susceptible to the worst air quality. A cold front will drop across the Northwest on Friday, which should improve air quality and bring an end to the air stagnation conditions.