PA Ozone/PM2.5 Forecast
December 6, 2013
Date: Friday, December 6, 2013
Temperature: Upper 30s
On Friday, expect overcast skies to continue to persist over the region as the cold front, which was off to our west on Thursday, finally moves off to our east. As a result, expect the winds to turn more northerly, allowing colder air to build in. A series of disturbances will move northward along the front during the day, which should help to keep rain over our area for a good portion of the day. As colder temperatures build in late, expect the precipitation to change over to something more frozen (snow/sleet). So as temperatures only reach into the upper 30s, expect air quality levels to remain within the good range.
Over the coming days, expect to see colder temperatures persist early on as an area of high pressure moves in over the region. Then we will see some variation in temperatures and precipitation as the overall pattern remains active. Here is how things are shaping up... The frontal system that moved through on Friday will drop to our south and then stall, allowing the colder air to the north to filter southward into our area. An area of high pressure will then shift from west to east across the Great Lakes and into the New England. Once this high moves off to our east early next week, expect to see the front, which was off to our south, jog back to our north as a warm front. This will allow warmer temperatures to build back into our area on Monday. A new cold front will be on its heels and will move through the region late Monday into Tuesday. Once again, the cold front passage will allow colder and drier conditions to build back into the region. These conditions will persist until the latter portion of the week. Overall, the active nature of the pattern and the cold and dry intrusions during the period are likely to hold PM 2.5 levels within the good range. --Nolan
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