News & Events

Air Quality (PM2.5) Forecast for Thursday and Yesterday's Concentrations

Wednesday, October 29, 2008

Thursday, October 30, 2008:
Fine Particulates (PM 2.5) – Code GREEN

Short-Term Discussion: The main weather story this afternoon has been a cold and blustery one. Rain showers are scattered across the region, with even a snow shower thrown in across the highest elevations to the north and west. Temperatures are only running in the lower and middle 40s, and with the wind gusting to 25-30 mph, it feels more like the upper 20s. The weather pattern has been more typical of late November or early December. The only good news about the weather picture is that air quality for fine particulate continues to be quite good.

High pressure currently over the Ohio valley will begin to move eastward and build into the region tonight, and this should result in some clearing and lighter winds. Temperatures will drop to between 25-30 degrees by morning.

Tomorrow, more sunshine and less wind will make for a more pleasant day, though afternoon temperatures will still be several degrees below normal. There should also still be enough clean air from the west and northwest to keep fine particle levels in the atmosphere in the code GREEN range.

Clear and cold tomorrow night with very light winds and low temperatures once again dropping to between 25 and 30.

Extended: Looking ahead, high pressure will be located across the Carolinas Friday, and this will mean a return southwesterly flow, and a return to milder, more seasonable temperatures. Temperatures Friday afternoon can zoom in on the 60 degree mark. Still some sunshine Saturday as a cold front approaches. This front is moisture-starved, so no precipitation is expected to occur with it. Following this, high pressure will rebuild into the area Sunday with sunshine and temperatures mainly in the middle 50s. The southwest flow and less vertical mixing on Friday and part of Saturday may mean a return to fine particle levels going into the code YELLOW range. Following the frontal passage, mainly good air quality for Sunday.

Yesterday’s Regional Maximum Air Quality Concentration
Tuesday, October 28, 2008:
PM 2.5 – GREEN (10 AQI or 3.1 µg/m3)