News & Events

Code Yellows This Weekend

Friday, January 9, 2009

Saturday, January 10, 2009:
Fine Particulates (PM 2.5) – Code YELLOW

Sunday, January 11, 2009:
Fine Particulates (PM 2.5) – Code GREEN

Monday, January 12, 2009:
Fine Particulates (PM 2.5) – Code YELLOW

Yesterday’s Regional Maximum Air Quality Concentration:
Thursday, January 8, 2009:
PM 2.5 – GREEN (32 AQI or 9.7 µg/m3)

Short-Term Discussion: A storm developing out over the central Plains at this hour will be the major factor in our weather over the next 36 hours. Early tonight, clouds ahead of it will thicken over the area, and snow can begin towards morning. As the storm tracks just to our south later on tomorrow and tomorrow night, we can expect periods of snow. Right now it appears as though a general 4-6 inches of snow can accumulate across the area. A bit of sleet can also mix in with the snow, but not enough to cut accumulations significantly. The National Weather Service office in Mount Holly, NJ has issued a Winter Storm Watch for the region from early Saturday through Sunday morning. Lighter winds and less mixing have caused PM 2.5 levels to rise today, and these levels may continue to be in the lower moderate range tonight and part of Saturday, before levels come down later in the day. Overall, PM 2.5 levels Saturday should average in the lower code YELLOW range.

Snow should end early Sunday morning across the region, and winds should increase during the early morning hours. Lows will drop to near 20 degrees.

Extended: The overall weather pattern should be a cold one next week. High pressure should provide dry weather for Sunday afternoon into Monday, with temperatures averaging a few degrees below normal. A cold front will then bring the chance for a bit of snow on Tuesday. Following this, the coldest air of the winter may charge southward from Canada for the middle and latter part of next week. Temperatures by next Friday afternoon might not even reach 20 degrees, and could be in the single digits at night. There is even another shot of snow for Thursday. Most of the long range should see air quality in the good range because of a strong and broad west to northwest flow. The best chance for moderate air quality might be on Monday due to high pressure overhead, a more stable atmosphere, and little vertical or horizontal mixing.