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| Pennsylvania Air Quality Conditions & Forecasts |
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Lehigh Valley | Liberty/Clairton area | Philadelphia | Pittsburgh | Susquehanna Valley Data courtesy of Pennsylvania Department of Environmental Protection |
| Pennsylvania Air Quality Summary | National Air Quality Summary |
 0 - 50Good |
 51 - 100Moderate |
 101 - 150
Unhealthy for Sensitive Groups |
 151 - 200Unhealthy |
 201 - 300Very Unhealthy |
 301 - 500Hazardous |
 Action Dayclick on the icon in city forecast area for more details |
| Liberty/Clairton area | |||||||||||||||||
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CURRENT AIR QUALITY CONDITIONS Wednesday May 6, 2009 |
TODAY'S FORECAST Wednesday May 6, 2009 |
TOMORROW'S FORECAST Thursday May 7, 2009 |
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| Particles (PM2.5) |
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| Detailed Forecast Discussion | |||||||||||||||||
| Current Conditions: As of 2 PM on Tuesday, overcast conditions continued to persist across the region as yet another disturbance propagates northward along the stalled out frontal system to our south. Right now, we are watching an area of low pressure, centered in eastern Tennessee along that front, move off to the north and east. This should help to drive another shot of rain our way. However, much of the rain should remain off to our south and east. Temperatures continue to hang on the cool side of normal, with readings registering in the upper 50s. The cloud cover and the cooler temperatures are keeping ozone and PM 2.5 levels confined to the good range today. However, by tomorrow, we expect these levels to increase as a higher PM 2.5 air mass builds in from the Ohio / Tennessee River Valley. ***Wednesday's Forecast: So for Wednesday, expect overcast conditions to prevail for much of the day as we have one storm system pass off to our east in the early morning as another storm system pushes out of the Ohio Valley into our area late in the day. Therefore, other than some late day showers, we should remain dry for much of the day. With the break in the rain and the winds blowing out of the southwest, expect afternoon temperatures to peak closer to seasonable levels and rise into the mid to upper 60s. As the air mass that was over the Ohio Valley moves into the region prior to the storm system affecting our area, expect PM 2.5 levels to rise into the moderate range. Ozone will be limited to the good range thanks to the cloud cover overhead. ***Extended Outlook: Over the coming days, we can expect the wet trend to continue as we see a couple more systems come through the region. As a result of this active weather pattern prevailing for the remainder of this week, expect temperatures to hover below normal. by the weekend, we should see a more tranquil pattern set up over the region. So here is how things are shaping up... After the rain moves through early Thursday, expect things to dry out Thursday night as the storm system moves off to our east. Another storm system should push through on Friday, providing the region with more rain. We should see some drier conditions build in briefly just to be broken up by a weak disturbance moving in on Saturday. By the end of the weekend, we should see an area of high pressure push in over the area just in time for the beginning of next week. Air quality levels during this time frame should be in the good to low moderate range early as the cool and wet weather continues to persist over the region. Levels should increase next week as see more stability settle in over the region (thanks to the area of high pressure moving in). | |||||||||||||||||
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