CT Weather: Heavy Rain, Thunderstorms Expected Tonight, Sunday

The National Weather issued an updated forecast for tonight and there is some good news. The chance for widespread hazardous weather tonight and Sunday is not expected and chances of a tornado are diminishing but "can't be ruled out," the weather service says.

The rain is expected to begin after 8 p.m. tonight beginning in western Connecticut. The heaviest of the rain and the chance for severe thunderstorms is likely to occur while we're sleeping. Showers are expected during the day on Sunday and heavier rain and more thunderstorms are expected Sunday night.

More rain is expected Monday and there is a 40 to 50 percent chance of rain on Tuesday, Wednesday, Thursday, Friday, and Saturday.

Southern Fairfield County

...WIND ADVISORY IN EFFECT FROM 11 PM THIS EVENING TO 6 AM EDT SUNDAY...

DAY ONE...Tonight.

Wind Advisory.

The coastal storm responsible for these winds could also produce thunderstorms capable of producing locally stronger damaging winds or a brief tornado late tonight.

The National Weather Service in Upton has issued a Wind Advisory, which is in effect from 11 PM this evening to 6 AM EDT Sunday.

* WINDS...East 20 to 30 mph with gusts up to 45 mph.

* TIMING...Late this evening and overnight.

* IMPACTS...Greatest impacts will be closer to the immediate shorelines. Strong winds may blow down limbs, trees, and power lines. Scattered power outages are expected.

Northern sections of Fairfield County.

There are no advisories for this area according to the National Weather Service. Here is the 36-hour forecast.

Tonight
A chance of showers, then showers and possibly a thunderstorm after midnight. Some of the storms could produce heavy rain. Low around 67. Breezy, with an east wind 14 to 22 mph. Chance of precipitation is 100%. New rainfall amounts between a half and three quarters of an inch possible.

Sunday
Showers likely, mainly before 8am. Mostly cloudy, with a high near 81. South wind 10 to 15 mph. Chance of precipitation is 60%. New precipitation amounts between a quarter and half of an inch possible.

Sunday Night
A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 2am. Some of the storms could produce heavy rain. Low around 72. Southeast wind 8 to 10 mph. Chance of precipitation is 80%. New rainfall amounts between three quarters and one inch possible.

Northern Middlesex-Northern New London-Southern New Haven-Southern Middlesex-Southern New London

Tonight

There is a low probability for widespread hazardous weather. A coastal storm could produce thunderstorms capable of producing locally stronger damaging winds or a brief tornado late tonight.

Hartford, Tolland and Windham counties

There is the risk for very localized urban flash flooding early Sunday morning through Sunday afternoon anywhere west of the Cape Cod Canal. This would occur if 1 to 2 inches of rain occurred in less than an hour in our typically prone locations.

The overall severe weather threat on Sunday is low...but an isolated thunderstorm or two with gusty winds is possible. The threat for a brief tornado/waterspout appears to be diminishing...but still can not be completely ruled out.

Litchfield County

Low pressure moving north from the mid-Atlantic states to western and central New York will produce periods of rain tonight with localized heavy rain possible.

Localized urban and poor drainage flooding will be possible late tonight especially over higher terrain, however widespread flooding is not expected.

In addition, stronger wind gusts will be possible across the higher terrain of the Catskills, Taconics, Berkshires, southern Adirondacks, southern Greens and northwest hills of Connecticut up to 40 mph.

Original post: Don't be fooled by the sun this morning and early afternoon as it's going to depart soon enough and it will make way for a whole bunch of severe weather possibilities. Starting tonight, Connecticut will see heavy rain, thunderstorms, flash flooding concerns, and even the chance of a tornado. So basically Mother Nature is throwing the kitchen sink at us beginning tonight and lasting into late next week.

The weather service says a storm system will stall off of the coast which is likely to lead to rain showers, thunderstorms and flash flooding concerns through much of next week.

Here are the latest advisories based on where you are in Connecticut via the National Weather Service:

Southern Fairfield-Southern New Haven-Southern Middlesex-Southern New London (also known as the immediate Connecticut coastline)

There is potential for locally heavy rainfall this evening through tonight that could lead to localized urban flash flooding. Late tonight there is also the potential for thunderstorms capable of producing isolated damaging wind gusts or a brief tornado.

Sunday through Friday

A nearly stationary frontal system could produce showers and thunderstorms capable of causing flash flooding through much of the week.

Northern Fairfield-Northern New Haven-Northern Middlesex-Northern New London (also known as inland sections of Southern CT)

There is potential for locally heavy rainfall this evening through tonight that could lead to localized urban flash flooding.

Sunday through Friday

A nearly stationary frontal system could produce showers and thunderstorms capable of causing flash flooding through much of the week.

Hartford CT-Tolland CT-Windham CT-

Saturday night into Sunday...

Tropical downpours after midnight and into Sunday will produce rainfall rates upwards of 1 to 2 inches per hour with storm total rainfall amounts of 1 to 3 inches, locally higher. There is the threat of flooding with heavy rain.

In addition, accompanying thunderstorms could be strong to severe. Threats of gusty winds and possibly even a brief spin up of a waterspout or tornado.

While all of Southern New England is at risk, greatest concern is along a south to north line centered along and around the RI / CT border through the eastern half of MA.

Associated potent storm system, the combination of wind and wave action could result in dangerous rip currents.

Litchfield County

Low pressure moving north from the mid-Atlantic states to central New York will produce periods of rain Saturday night with localized heavy rain possible. Localized urban and poor drainage flooding will
be possible late Saturday night especially over higher terrain, however widespread flooding is not expected. In addition, stronger wind gusts will be possible across the higher terrain of the Catskills, Taconics, Berkshires, southern Greens and northwest hills of Connecticut overnight.

There is a chance of thunderstorms Monday through Thursday. Thunderstorms may contain locally heavy rainfall, with a very humid air mass in place.

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