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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
April 18, 2014

 

Date: Friday, April 18, 2014
Action Day?:  No
Temperature:  Mid to Upper 50s
Discussion:
Light south/southeasterly flow will continue on Friday with the high pressure that brought clear skies late Wednesday/Thursday now well off to our north and east. Disturbances both well to our north and to our south will have minimal impact on conditions for Friday. There will be a slight chance for an isolated shower, but most areas should remain dry. The slight increase in moisture levels may assist in forming increasing clouds, which would hold temperatures slightly below normal again. Highs will climb only a few degrees higher than that of Thursday with a lack of ample sunshine. The combination of the slight increase in moisture and light winds should allow PM 2.5 concentrations that were in the higher end of the good range on Thursday to push more into the low moderate range for Friday.

Extended:
High pressure will begin to build from the west/northwest early on Saturday, allowing for increasing sunshine once again by the afternoon. The increase in sunshine will allow temperatures to return to the 60s. Winds will eventually turn breezy and more northwesterly to northerly. Moderate levels of PM 2.5 may remain in the lower end of the moderate range for the early portion of the day on Saturday, but will likely return to the good range by late afternoon. The breezy winds increasing mixing and slight decrease in moisture will combine to account for the slight improvement in air quality. Concentrations will likely average out to be close the good/moderate threshold. The back and forth seesaw between the good and moderate range will continue on Sunday. At the present time, it is expected that PM 2.5 concentrations will begin the day in the higher end of the good range before increasing slightly back to low moderate by late afternoon. After favorable conditions for moderate air quality on Monday, the next disturbance arriving on Tuesday will bring improving conditions once again for the middle of the week. Temperatures should reach near to slightly above normal values for most of the period covered in the extended forecast. --- Roble

 

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