CT Weather: Thunderstorms Thursday AM Followed By Heatwave

The heat and humidity will arrive on Friday and stick around for awhile as temps exceed 90 degrees in parts of Connecticut. But before the heat and humidity takes over, there is a good chance we'll wake up early Thursday to thunderstorms and isolated downpours.

In a Hazardous Weather Outlook for Southern Connecticut, the National Weather Service says, "Heat will build across the region Friday through Monday. There is the risk of reaching heat advisory criteria with heat indices and/or temperatures at or above 95 degrees for two or more consecutive days."

For Northern Connecticut, the weather service says for Thursday, "Heavy rain associated with showers and embedded thunderstorms could yield urban and poor drainage flooding, especially in the typically prone locations."

And for Friday through Monday, "Heat will build across the region. There is the risk across interior portions of Southern New England of reaching heat advisory criteria with heat indices and/or temperatures at or above 95 degrees for two or more consecutive days."

Showers are expected to break out late tonight across Connecticut and will increase in intensity during Thursday's morning commute and thunderstorms are also expected in some areas. More unsettled weather is possible Thursday night too.

WTNH News 8 Meteorologist Gil Simmons says, "Wednesday, Turning cloudy today with high temperatures in the 70s. You will notice more humidity and there might be a shower in western Connecticut. Heavy rain and thunder tonight into tomorrow morning! A slow Thursday AM commute! A scattered shower or thunderstorm during the day tomorrow. Sunshine and lots of heat Friday through Monday."

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Here is the updated forecast for Southern CT:

Today: Mostly cloudy, with a high near 75. South wind 9 to 11 mph.

Tonight: Showers likely, with thunderstorms also possible after 2am. Cloudy, with a low around 68. Southeast wind around 13 mph. Chance of precipitation is 70%. New rainfall amounts between a quarter and half of an inch possible.

Thursday: Showers and thunderstorms, mainly before 2pm. High near 79. South wind around 9 mph. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.

Thursday Night: Mostly cloudy, then gradually becoming mostly clear, with a low around 67. South wind around 6 mph becoming calm after midnight.

Friday: Sunny, with a high near 86. West wind 3 to 6 mph.

Here is the updated weather forecast for Northern CT:

Today: Mostly cloudy, with a high near 78. South wind 7 to 11 mph.

Tonight: Showers likely, mainly after 1am. Patchy fog after 4am. Otherwise, cloudy, with a low around 67. South wind around 8 mph, with gusts as high as 21 mph. Chance of precipitation is 70%. New precipitation amounts between a quarter and half of an inch possible.

Thursday: Showers and possibly a thunderstorm, mainly before 3pm, then a chance of showers and thunderstorms after 3pm. Some of the storms could produce heavy rain. Patchy fog before 8am. High near 80. South wind around 9 mph, with gusts as high as 22 mph. Chance of precipitation is 90%. New rainfall amounts between a half and three quarters of an inch possible.

Thursday Night: A chance of showers and thunderstorms, mainly before 8pm. Some of the storms could produce heavy rain. Patchy fog after 3am. Otherwise, mostly cloudy, then gradually becoming mostly clear, with a low around 66. Southwest wind 5 to 8 mph becoming light and variable after midnight. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

Friday: Sunny, with a high near 90. Northwest wind 3 to 7 mph.

Friday Night: Mostly clear, with a low around 68.