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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
December 23, 2014

 

Date: Tuesday, December 23, 2014
Action Day?:  No
Temperature: Mid to Upper 40s
Discussion:
Chances for light showers will persist throughout the day on Tuesday as a result of moisture levels continuing to increase across the region. Skies will remain overcast with temperatures slowly rising. After a cold start to the morning on Monday, warmer air pushed northward aloft and gradually helped temperatures at the surface climb to just above freezing levels through the early afternoon hours. The warmer air will continue the northward surge along with the increasing moisture to continue to push temperatures to levels above normal for this time of year. With showers on the light side despite elevated moisture levels, winds nearly calm, and temperatures aloft still slightly warmer than at the surface, PM-2.5 concentrations should remain elevated in the moderate range on Tuesday. Concentrations will be close to or slightly above values from Monday, but a significant rise is not expected. Increased rainfall rates will be more likely to occur on Wednesday as a sharp cold front begins to approach from the west.

Extended:
Rain is likely on Wednesday with strong southerly flow aloft continuing to usher moisture and milder temperatures northward into the region ahead of a sharp cold front. This front will push from west to east over the late afternoon to late evening hours on Wednesday. Increased rainfall rates should help PM-2.5 concentrations begin to fall to levels in the middle to lower half of the moderate range. Winds will remain mostly light to calm until the front pushes through. Increased winds just behind this boundary will increase vertical mixing and help PM-2.5 levels dip back into the good range. Temperatures will continue to rise ahead of the front, pushing at least five to ten degrees above normal with highs into the 50s possible. Good air quality is expected for Thursday with high good to low moderate returning as early as Friday-Saturday. --- Roble

 

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