Several weather alerts have been issued for Darien and Fairfield County on Thursday. An air quality alert has been issued through 10 p.m. Thursday night, according to the National Weather Service.
A severe thunderstorm warning and flash flood alert  has been issued for the same area through late Thursday night.
Thursday afternoon
Scattered showers and thunderstorms. Some storms could be severe, with damaging winds and heavy rain. Partly sunny, with a high near 90. West wind around 8 mph. Chance of precipitation is 50%.
Thursday night
Showers and thunderstorms likely, mainly before 10pm, then showers likely and possibly a thunderstorm after 1am. Some of the storms could produce gusty winds and heavy rain. Cloudy, with a low around 67. Northeast wind around 8 mph. Chance of precipitation is 60%. New rainfall amounts between three quarters and one inch possible.
Friday
Showers likely and possibly a thunderstorm before 7am, then a chance of showers and thunderstorms between 7am and noon, then showers likely and possibly a thunderstorm after noon. Some of the storms could produce heavy rain. Cloudy, with a steady temperature around 68. Northeast wind around 9 mph. Chance of precipitation is 60%. New rainfall amounts between a half and three quarters of an inch possible.
Friday night
Showers likely and possibly a thunderstorm before 11pm, then a chance of showers and thunderstorms after 11pm. Cloudy, with a low around 66. East wind 3 to 8 mph. Chance of precipitation is 60%. New rainfall amounts between a quarter and half of an inch possible.
Saturday
A 20 percent chance of showers and thunderstorms before noon. Patchy fog before 9am. Otherwise, cloudy, then gradually becoming mostly sunny, with a high near 85. Northwest wind 6 to 8 mph.
Saturday night
Partly cloudy, with a low around 68.
Sunday
Sunny, with a high near 86.