A flood watch and hazardous weather outlook are in effect today for southwestern Connecticut, the result of heavy rain and patchy fog the National Weather Service predicts will buffet the region this afternoon into tomorrow.

The rain is expected to start sometime this afternoon and should become more intense overnight and tomorrow as a cold front stalls, triggering periodic rainfall that total from 1.5 to 3-plus inches by the time it eases late tomorrow. That, in turn, the NWS warns could trigger flooding in rivers and streams already near their capacity.

Heavy fog will continue to blanket parts of the region until late this morning, as the daytime high temperature rises to the low-70s. There will be an east wind between 6 and 8 mph.

Tonight will be showery, with a low temperature in the mid-60s.

Rain is expected to fall through much of tomorrow and the high temperature will be in the mid-70s. Showers are also likely tomorrow night as foggy conditions develop again and the overnight low falls to the mid-60s.

On Sunday, there is still a chance of showers and thunderstorms, while skies remain cloudy and the temperature reaches a high in the mid-70s. Precipitation remains possible Sunday night, which will see more fog and low temperatures in the mid-60s.

And Monday could see more of the same, the weather service predicts, with a chance of showers and thunderstorms. Skies will be cloudy and the high temperature will be in the mid-70s.