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Lehigh Valley Ozone/PM2.5 Forecast

Small map of Pennsylvania showing counties involved in the lv partnership.
Forecasted AQI for Ozone Air Quality Index Scale Forecasted AQI for PM2.5
April 24, 2014

 

Date: Thursday, April 24, 2014
Action Day?:  No
Temperature:  Low 60s
Discussion:
High pressure will continue to slowly build over the region into the day on Thursday. We should expect mostly sunny skies with a slight rebound in afternoon temperatures from similar hours on Wednesday. Breezy northwesterly flow will continue, keeping the air well mixed and highs just below normal once again. Temperatures should manage to push into the lower 60s by the afternoon hours. With a dry and clean air mass remaining in place, PM 2.5 concentrations will stay inside the good range for the day.

Extended:
Cloud cover will begin to increase early Friday morning as the area of high pressure departs to our northeast and the next disturbance approaches from the west. The breezy northwesterly wind will turn to more south/southeasterly flow. Moisture levels will increase throughout the day. The best chances for precipitation appear to be from late afternoon and through the evening hours. PM 2.5 concentrations should climb to levels higher than that of both Wednesday and Thursday, but should remain mostly just inside the good range. The longer the flow has a more southeasterly component ahead of the precipitation, the more likely we will see a cleaner maritime air mass blanket the region. Brisk west to northwesterly flow will return during the day on Saturday as the system and associated cold front push eastward. This will return any near moderate to moderate concentrations back inside the good range for the remainder of the weekend. --- Roble

 

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