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Boston weather: Heavy rain expected this weekend

The weather map for Southern New England at 2 p.m. EDT on March 29, 2014. Moderate to heavy rain is expected Saturday night.
The weather map for Southern New England at 2 p.m. EDT on March 29, 2014. Moderate to heavy rain is expected Saturday night.
www.weather.gov

Forecast discussion: Boston was under cloudy skies for all of Friday, as the capital city was influenced by a cold front now passing into western New York, and extending as far south as southern Arkansas. Ahead of the front were some scattered showers and light rain. We will continue to see showers throughout the evening and early Saturday morning, before ending around 2 a.m. We will see a slight lull, before we receive some very heavy rainfall this weekend.

High temperature forecast for March 29, 2014
High temperature forecast for March 29, 2014
www.weather.gov

The heavy rainfall will come from a low pressure system now over northwest Louisiana. This low will follow right along the frontal boundary, and become stationary off the Mid-Atlantic coast. A warm front will extend itself just south of Rhode Island and Connecticut. It will move onshore Saturday afternoon, and it will bring moderate to heavy rain from early Saturday evening into Sunday night. Although there are no advisories for Boston at the moment, there is a Coastal Flood Advisory in effect for southern Bristol County from 6 a.m. to 10 a.m. Sunday morning. This advisory is out due to an expected high tide in Narragansett Bay around 9 a.m. The area could see a storm surge of 1 to 2 feet, resulting in some local roads and the chance for some basements to become flooded. When it is all said and done, the area could see 2 to 3 inches of total rainfall, with isolated areas of 4 inches possible.

The low pressure center will slowly move away from the east coast, but we will see scattered showers through Monday. The precipitation will finally come to an end before midnight early Tuesday morning. From there, we will not be seeing April showers as a high pressure ridge over the eastern U.S. brings a drier weather pattern. We will see partly to mostly sunny skies Tuesday through Thursday. A low pressure system developing over the Ohio River Valley may bring a warm front south of Southern New England on Thursday night. We may see more scattered showers from this frontal boundary into next Friday. Temperatures will be warmer, as our highs will be slightly below seasonable, starting on Tuesday.

72 hour forecast:

Tonight: Overcast with showers ending around 2 a.m. and mild with a low of 43.
Saturday: Partly sunny with showers arriving by 2 p.m. Showers turn to moderate rain by 6 p.m. We will see a high of 50 with east-northeast winds of 8-11 mph.
Saturday night: Moderate to heavy rain with a low of 39. Winds will increase from the east-northeast at 13-16 mph.
Sunday: Moderate to heavy rain tapering to showers by the early evening. We will see a high of 43.
Sunday night: Showers/light rain continues with a low of 34.
Monday: Scattered showers with a high of 42.
Monday night: Showers ending after midnight with a low of 35.

Extended Forecast:
Tuesday: Mostly sunny. Highs 47-50, lows 34-37.
Wednesday: Partly sunny. Highs 51-54, lows 34-37.
Thursday: Partly sunny with possible showers by 9 p.m. Highs 49-52, lows 36-39.
Friday: Scattered showers. Highs 46-49, lows 36-39.