Date: Saturday-Monday, April 29 - May 1, 2017
Action Day? No
A series of frontal boundaries will impact the State of Delaware this weekend, leading to changeable weather. Saturday will be reminiscent of July, with warm and humid conditions ahead of an approaching cold front.
Light surface winds in the morning and the continued presence of regional smoke from fires burning in Mexico and Central America will allow particles to linger in the Moderate range. The front will stall across
southern Delaware on Sunday. Converging winds in the vicinity of the front will continue to keep smoky air in place, for persistent Moderate air quality. If the front reaches farther south than expected, onshore
winds may be sufficient to push daily air quality into the Good range. The will return northward on Monday, allowing temperatures and humidity to surge again. Breezy southerly winds will bring cleaner air into
the state, for upper Good air quality.
A much stronger cold front will arrive early Tuesday morning. More seasonable air will build into the forecast area during the day, for Good air quality. Forecast note: 2017 ozone forecasts will begin on Monday, May 1.