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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 1, 2015

 

Date: Wednesday, April 1, 2015
Action Day?:  No
Temperature: near 50 Wednesday
Discussion:
April will begin on a dry note, but with temperatures still below average. With sunshine and some clouds, high temperatures will reach close to the 50 degree mark. Dry air and moderate mixing will keep fine particulate concentrations on the low side. Mostly moonlit Wednesday night. PM2.5 levels will increase as winds will be light and shift into more of a southerly direction. Lows in the lower to middle 30s.

Extended:
Southwesterly winds will bring in warmer air with increased moisture for Thursday and Friday. PM levels will increase into the moderate range on Thursday into early Friday. Rain expected later Friday into Friday night will lower concentrations once more. Highs will reach into the middle 60s by Thursday afternoon, with 70 possible on Friday if the rain holds off and there is some sunshine. A cold front will then pass through Friday night with periods of rain and a thunderstorm. Very good air quality will follow for Saturday with brisk northwesterly winds and chillier air advecting back in. Highs Saturday may remain in the middle 40s. High pressure should then bring tranquil weather for Easter Sunday into Monday with highs of 50-55 Sunday and 55-60 Monday. Fine particulate will increase from the good range Sunday to more moderate Monday with light west to southwest winds. A stationary frontal boundary will then bring the chance for unsettled weather towards the middle of next week with air quality varying between good and moderate, depending on which side of the boundary we are on and how heavy any rainfall is. --McAuliffe

 

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