Forecast Discussion

Date: Sunday, April 21, 2019 - 15:00 ET

Forecast Valid: Monday, April 22, 2019

Today's Air Quality Conditions: Code Green air quality statewide this afternoon. 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: Tomorrow, well-below normal temperatures continue in the wake of the massive upper level storm system that pushed through the eastern U.S. over the weekend. A clean and dry air mass should keep air quality levels near the Code Green range for one more day, although ozone levels may creep into the low Code Yellow range in the Charlotte and Triangle regions due to the dry and sunny conditions with relatively light winds.

Outlook: On Tuesday into Wednesday, surface high pressure will remain over the southeast, resulting in an increasingly stagnant air mass. It appears the air mass will also remain fairly dry. These conditions are a recipe for ozone production, and the expectation is that ozone levels will likely rise into the mid to possibly even upper Code Yellow range in the Charlotte and Triangle regions, and remain lower in the Code Yellow across the state. By Wednesday, there is a chance that if skies remain mostly sunny that ozone levels could approach the Code Orange range in at least the Charlotte region and this will have to be monitored over the coming forecasts. Particle pollution levels will likely begin to rise into the low Code Yellow range in at least some portions of the state as well.

Extended Air Quality Outlook
Forecast Day
AQI Range
Category Range
Monday 45-54 Green-Yellow
Tuesday 47-87 Green-Yellow
Wednesday 58-100 Green-Yellow

(McLamb - NC Division of Air Quality)


Date: Saturday, April 20, 2019 - 15:00 ET

Forecast Valid: Sunday, April 21, 2019

Today's Air Quality Conditions: Code Green air quality statewide this afternoon. 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: Through Monday, a cold front will sweep across the state and air quality levels will lower back into the Code Green range statewide. Ozone levels may creep back up into the low Code Yellow range in the Charlotte and Triangle regions by Monday.

Outlook: On Tuesday, surface high pressure will remain over the southeast, resulting in an increasingly stagnant air mass. It appears the air mass will also remain fairly dry. These conditions are a recipe for ozone production, and the expectation is that ozone levels will likely rise into the mid to possibly even upper Code Yellow range in the Charlotte and Triangle regions, and remain lower in the Code Yellow across the state. Particle pollution levels will likely begin to rise into the low Code Yellow range in at least some portions of the state as well.

Extended Air Quality Outlook
Forecast Day
AQI Range
Category Range
Sunday 40 Green
Monday 43-58 Green-Yellow
Tuesday 45-87 Green-Yellow

(McLamb - NC Division of Air Quality)