Hazardous Weather Outlook Issued For Southern Connecticut: Here's What You Need To Know

SOUTHERN CONNECTICUT — The National Weather Service has issued both a hazardous weather outlook and a heat advisory for southern Connecticut.

In the hazardous weather outlook statement, the weather service said, "There is an isolated severe thunderstorm and flash flooding threat on Sunday afternoon into evening..."

And a heat advisory is in effect from 11 a.m. Monday to 8 p.m. Tuesday.

In southern parts of New Haven and Middlesex counties and interior sections of New London County, "Heat index values in the upper 90s F likely on Monday, and 100 to 105F on Tuesday," according to the weather service.

In all of Fairfield County and interior sections of Middlesex and New Haven counties, "There is potential for widespread heat indices of 105+F on Tuesday," according to the weather service.

For coastal sections of New London County, the weather service said, "Heat index values in the mid 90s F likely on Monday, and upper 90s F on Tuesday."

Timing of the rain/storms on Sunday

"Tomorrow is muggier and as a disturbance passes through the region, it will trigger periods of rain and the possibility of storms. The main round arrives late morning and lasts through the early afternoon as it passes across the state," according to WFSB 3 TV meteorologists. "A second round, will feature more widely scattered downpours and storms, is expected in the late afternoon and early evening.

Excessive rainfall is a concern

"....It’s important to note that the western half of the state is included in a level 1 risk for excessive rainfall which could leave to some poor drainage flooding in some of the heavier storms that may develop. Temperature-wise, we’re forecasting highs in the upper 70s and lower 80s," according to WFSB 3 TV meteorologists. (Read more at WFSB 3 TV).

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Here are the forecast details via the National Weather Service:

Tonight: A 30 percent chance of showers after 5am. Mostly cloudy, with a low around 65. South wind 5 to 8 mph becoming calm in the evening.

Sunday: Showers and thunderstorms likely, mainly before 2pm, then showers likely and possibly a thunderstorm after 5pm. Mostly cloudy, with a high near 80. South wind 3 to 8 mph. Chance of precipitation is 60%. New rainfall amounts between a quarter and half of an inch possible.

Sunday Night: Showers and thunderstorms likely, mainly before 11pm. Mostly cloudy, with a low around 70. South wind around 5 mph becoming calm in the evening. Chance of precipitation is 60%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

Monday: Sunny, with a high near 94. Heat index values as high as 102. Calm wind becoming northwest 5 to 7 mph in the morning.

Monday Night: Mostly clear, with a low around 70. Calm wind.

Tuesday: Sunny, with a high near 96.

Tuesday Night: Mostly clear, with a low around 72.

Wednesday: Sunny, with a high near 93.