News & Events

Weekend/Monday Air Quality (PM2.5) Forecast

Friday, October 24, 2008

The Lehigh Valley/Berks Area Air Quality Forecast for:


Saturday, October 25, 2008:
Fine Particulates (PM 2.5) – Code GREEN

Sunday, October 26, 2008:
Fine Particulates (PM 2.5) – Code GREEN

Monday, October 27, 2008:
Fine Particulates (PM 2.5) – Code GREEN


Regional Maximum PM 2.5 Concentrations:
Thursday October 23, 2008:
PM 2.5 – GREEN (30 AQI or 9.1 µg/m3)


Short-Term Discussion: We should get some much needed rain this weekend then a quick blast of cold air to start out next week. High clouds have overspread the region ahead of an approaching storm system. The actual rain associated with this sprawling system remains well to our south and west and is not expected to arrive until Saturday morning. Air-quality levels have moved well into the moderate range across parts of the area possibly due to some smoke noted by our colleagues in the Philadelphia area. Tomorrow’s rain should help eventually improve air-quality conditions.

Thickening clouds overnight with rain developing by Saturday morning; low temperatures will only fall into the upper 40s. Cloudy with showers during the day on Saturday that could be heavy at times and possibly include a rumble of thunder. Afternoon temperatures will slowly rise towards into the upper 50s. Rain and brisk southeasterly winds should cause Saturday’s fine-particulate concentrations to fall back into the code GREEN (good) range though overnight and morning levels could be unusually high due to any lingering smoke.



Showers ending overnight with clouds expected to clear out before morning; if skies clear out completely temperatures could fall into the low 40s or colder in some of the outlying areas. Partly sunny and seasonable on Sunday with afternoon temperatures expected to push into the low 60s. Brisk westerly winds should limit Sunday’s fine-particulate levels to the code GREEN (good) range.

A strong cold front is expected to cross the region early Monday morning. Brisk winds, much cooler temperatures and the possibility of some light showers will greet morning commuters as temperatures fall into the low 40s. Partly sunny and windy on Monday with afternoon temperatures only expected to reach the 50-degree mark. Brisk winds and drier air should ensure Monday’s fine-particulate concentrations remain in the code GREEN (good) range.

Extended: Temperatures will be much cooler to start off next week. Below normal temperatures should persist through Thursday before we see some gradual warming to start the weekend. Air-quality levels should be in the good range for the first half of the workweek.