Forecast Discussion

Date: Friday, December 14, 2018 - 15:00 ET

Forecast Valid: Saturday, December 15, 2018

Today's Air Quality Conditions: Particle pollution has drifted down to around the Green/Yellow boundary over the Piedmont. In the rest of the state, particle pollution is in the Code Green range. Rain will soon bring particle pollution down into the Code Green range over the entire state. For a display of the most recent air quality conditions throughout the remainder of this afternoon, please visit the US EPA's AIRNOW web site.

General Forecast Discussion: For Saturday, surface low pressure will track from eastern North Carolina northeast into the coastal Mid-Atlantic. The heavier and steadier rain will exit the Piedmont by mid-morning and will push off the coast around midday. An upper level low will drift northeast from the Deep South into the southern Appalachians. North Carolina will be within the eastern envelope of the upper low which will keep clouds and scattered showers over the area after the heaviest rain passes through. Particle pollution will remain in the Code Green range.

Outlook: On Sunday, the upper low will continue drifting northeast into the Mid-Atlantic. Western areas will have mostly sunny weather while eastern areas will hang onto more clouds and a chance of a stray shower. Particle pollution will remain in the Code Green range. High pressure will build over the area during the first part of the work week. Lighter winds and reduced mixing will allow particle pollution to increase. Particle pollution is expected to remain in the Code Green range on Monday then possibly rise into the Code Yellow range on Tuesday.

Extended Air Quality Outlook
Forecast Day
AQI Range
Category Range
Saturday 20-30 Green
Sunday 20-30 Green
Monday 25-40 Green

Note: Ozone is forecast from April 1 to October 31. During the cool season ozone is typically in the Code Green range.

(Witcraft - NC Division of Air Quality)


Date: Thursday, December 13, 2018 - 15:00 ET

Forecast Valid: Friday, December 14, 2018

Today's Air Quality Conditions: Particle pollution is in the lower Code Yellow range in most areas of the state. For a display of the most recent air quality conditions throughout the remainder of this afternoon, please visit the US EPA's AIRNOW web site.

General Forecast Discussion: A low pressure system will track from the Deep South into the Appalachian Mountains / Western North Carolina on Friday. Rain will spread into the Mountains and western Piedmont tonight and into the rest of the state by noon. Heavy rain will knock particle pollution down into the Code Green range.

Outlook: The surface low will continue tracking northeast into the Mid-Atlantic. An upper low pressure trailing the upper low will inch eastward near/over North Carolina during Saturday and the first part of Sunday. The heaviest rain will end during Saturday morning, followed by mostly cloudy skies with occasional showers for the rest of Saturday into Sunday. Skies will begin to clear Sunday morning and in eastern area during Sunday afternoon as the upper low presses east/northeast. Particle pollution will remain in the Code Green range throughout the weekend.

Extended Air Quality Outlook
Forecast Day
AQI Range
Category Range
Friday 25-30 Green
Saturday 20-30 Green
Sunday 20-30 Green

Note: Ozone is forecast from April 1 to October 31. During the cool season ozone is typically in the Code Green range.

(Witcraft - NC Division of Air Quality)