PA Ozone/PM2.5 Forecast
October 7, 2015
Date: Wednesday, October 7, 2015
Temperature: Low 70s
On Wednesday, expect a bit more clouds to move in as a weak frontal system swings through. With the passage of this front, there will not be much in the form of showers. The front will act more as a transition between areas of high pressure, with the new high moving in from southcentral Canada. This new high will ensure that our winds stay out of the north. With the temperatures remaining in the low 70s for the afternoon and humidity levels increasing slightly, expect PM 2.5 levels to approach the good / moderate threshold.
Over the coming days, expect temperatures to remain near normal early on as high pressure continues to dominate our weather. A cold front passage on Friday will erase whatever warmth was around the region on Wednesday into Thursday. While delivering rain, the front should also help to keep PM 2.5 levels elevated. Once the front pushes through and a new area of high pressure builds in over the Mississippi River valley, expect cooler and drier weather to build in, resulting in better air quality. This high will shift east early next week. As it does, our winds will turn more out of the west, allowing warmer air to return. Expect PM 2.5 levels to rebound toward the good / moderate range as a result. --Nolan
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