A slow-moving, three-day storm could bring flash flooding and waves of tropical downpours across Massachusetts this week.
A brilliant weekend will be followed by one more sunny and dry day on Monday before rain arrives on Tuesday and lasts until at least Thursday, according to the National Weather Service.
Rain is expected to peak on Wednesday with multiple downpours and the potential for a deluge in areas where heavy bands of rain set up and linger for hours.
The NWS said there is a medium risk for flooding across much of the Bay State — especially in urban and poor-drainage areas.
Rain should arrive after 2 p.m. on Tuesday in what will otherwise be a warm and muggy day with a high of 84 degrees.
Tuesday night will feature scattered showers before rain becomes more persistent on Wednesday morning. The NWS said there will be a strong East wind gusting to 25 mph and highs holding in the lower 70s.
The chance of rain on Wednesday is 90 percent.
Rain is forecast to linger into Thursday as the storm stalls near New England with a cool wind out of the Northeast and a high of 74 degrees.
Conditions should slowly improve heading into the weekend with a 30 percent chance of rain on Friday and mostly sunny skies on Saturday and Sunday.
Latest Forecast (National Weather Service):
Monday
Sunny, with a high near 81. Calm wind becoming east 5 to 8 mph in the afternoon.
Tuesday
Mostly clear, with a low around 65. Southeast wind around 6 mph becoming light and variable after midnight.
Tuesday
Scattered showers, mainly after 2 p.m. Mostly sunny, with a high near 84. Light south wind increasing to 8 to 13 mph in the morning. Chance of precipitation is 30%.
Tuesday Night
Scattered showers, mainly after 1am. Mostly cloudy, with a low around 65. Southeast wind 6 to 8 mph. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch possible.
Wednesday
Showers, with thunderstorms also possible after 11 am. Patchy fog before 2 pm. High near 76. East wind 11 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 90%.
Wednesday Night
Showers and possibly a thunderstorm. Low around 64. Northeast wind 7 to 10 mph. Chance of precipitation is 80%.
Thursday
Showers and possibly a thunderstorm. Patchy fog before 9 a.m. High near 75. Northeast wind 8 to 11 mph. Chance of precipitation is 80%.
Thursday Night
Showers likely, mainly before 8 p.m. Mostly cloudy, with a low around 63. North wind 6 to 8 mph. Chance of precipitation is 60%.
Friday
A chance of showers after 5 p.m. Mostly sunny, with a high near 78. North wind around 8 mph. Chance of precipitation is 30%.
Friday Night
Partly cloudy, with a low around 65. Light and variable wind.
Saturday
Mostly sunny, with a high near 83. Light and variable wind becoming southeast around 6 mph in the afternoon.
Saturday Night
Partly cloudy, with a low around 68. Southwest wind around 6 mph.
Sunday
A chance of showers. Mostly sunny, with a high near 85. South wind 5 to 9 mph. Chance of precipitation is 30%.
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