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Susquehanna Valley Ozone/PM2.5 Forecast

Small map of Pennsylvania showing counties involved in the sv partnership.
Forecasted AQI for Ozone Air Quality Index Scale Forecasted AQI for PM2.5
July 25, 2014

 

Date: Friday, July 25, 2014
Action Day?:  No
Temperature:  Near 80 Degrees
Discussion:
High pressure building overhead for the day on Friday will lead to mostly sunny conditions. Despite the increase in sunshine, temperatures will again be limited to a few degrees below normal. Highs will be once again near 80 degrees, but likely 2-3 degrees warmer than Thursday. With the high pressure more overhead, winds will be much lighter for the day. With less mixing occurring, PM 2.5 and ozone concentrations should rebound at least a little. With such a clean and dry air mass already in place, concentrations will be limited to the middle to high end of the good range.

Extended:
A return of more south/southwesterly flow on Saturday will begin to return seasonable conditions to the region. Temperatures will climb into the low to mid 80s with dew point temperatures climbing back into the 60s. A breezy south/southwesterly wind may limit how quickly PM 2.5 concentrations climb, possibly limiting values to the high end of the good range. Low moderate conditions may be possible in some locations, especially if a more modified air mass is transported northward when the south/southwesterly flow develops. Cloud cover will increase as well, limiting ozone concentrations to the good range. More unsettled weather will return by Sunday, increasing chances for precipitation. PM 2.5 levels may linger in the moderate range for one more day before the cold front pushes east by Monday. Ozone levels should once again remain limited to the good range. Drier and unseasonably cooler conditions will return again for the first half of the week in this 2-3 day seasonable/unseasonable cycle of late. --- Roble

 

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