Forecast Details for Merrimac, MA

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Overnight: Showers likely before 2am, then showers likely and possibly a thunderstorm between 2am and 5am, then a chance of showers and thunderstorms after 5am. Patchy fog. Otherwise, cloudy, with a low around 48. Light northeast wind. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

Thursday: A chance of showers, with thunderstorms also possible after 2pm. Patchy fog before noon. Otherwise, mostly cloudy, with a high near 64. Light and variable wind becoming east around 6 mph in the afternoon. Chance of precipitation is 30%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

Thursday Night: A chance of showers and thunderstorms. Patchy fog between 2am and 3am. Otherwise, mostly cloudy, with a low around 51. East wind around 6 mph becoming calm in the evening. Chance of precipitation is 50%. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

Friday: A chance of showers, with thunderstorms also possible after 11am. Mostly cloudy, with a high near 67. Light and variable wind becoming northeast 5 to 7 mph in the morning. Chance of precipitation is 50%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

Friday Night: A slight chance of showers before 10pm. Mostly cloudy, with a low around 46. Light northeast wind. Chance of precipitation is 20%.

Saturday: Mostly cloudy, with a high near 56. East wind 5 to 7 mph.

Saturday Night: A chance of showers after 3am. Cloudy, with a low around 44. East wind around 5 mph becoming calm in the evening. Chance of precipitation is 30%.

Sunday: Showers likely, mainly after 11am. Cloudy, with a high near 58. South wind 5 to 9 mph becoming west in the afternoon. Chance of precipitation is 60%.

Sunday Night: A chance of rain showers before 2am, then a chance of rain and snow showers between 2am and 4am, then a chance of snow showers after 4am. Mostly cloudy, with a low around 34. West wind around 8 mph. Chance of precipitation is 50%.

Monday: Mostly sunny, with a high near 48. West wind around 10 mph, with gusts as high as 21 mph.

Monday Night: Partly cloudy, with a low around 30. Northwest wind around 7 mph.

Tuesday: Sunny, with a high near 54. Southwest wind 6 to 8 mph.

Tuesday Night: Partly cloudy, with a low around 40. Southwest wind around 7 mph.

Wednesday: Partly sunny, with a high near 61. West wind 6 to 9 mph.

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North America Water Vapor (Moisture)

This map shows recent moisture content over North America. Bright and colored areas show high moisture (ie, clouds); brown indicates very little moisture present; black indicates no moisture.

Weather Topic: What are Nimbostratus Clouds?

Home - Education - Cloud Types - Nimbostratus Clouds

Nimbostratus Clouds Next Topic: Precipitation

A nimbostratus cloud is similar to a stratus cloud in its formless, smooth appearance. However, a nimbostratus cloud is darker than a stratus cloud, because it is thicker.

Unlike a stratus cloud, a nimbostratus cloud typically brings with it the threat of moderate to heavy precipitation. In some cases, the precipitation may evaporate before reaching the ground, a phenomenon known as virga.

Next Topic: Precipitation

Weather Topic: What is Rain?

Home - Education - Precipitation - Rain

Rain Next Topic: Shelf Clouds

Precipitation in the form of water droplets is called rain. Rain generally has a tendency to fall with less intensity over a greater period of time, and when rainfall is more severe it is usually less sustained.

Rain is the most common form of precipitation and happens with greater frequency depending on the season and regional influences. Cities have been shown to have an observable effect on rainfall, due to an effect called the urban heat island. Compared to upwind, monthly rainfall between twenty and forty miles downwind of cities is 30% greater.

Next Topic: Shelf Clouds