Forecast Details for Chelmsford, MA

Recent Locations: West Middleton, IN Orleans, CA Chelmsford, MA

Today: Scattered showers and thunderstorms, mainly after 3pm. Some of the storms could be severe and produce heavy rainfall. Partly sunny, with a high near 88. South wind 6 to 14 mph, with gusts as high as 28 mph. Chance of precipitation is 30%. New rainfall amounts between a quarter and half of an inch possible.

Tonight: Showers and possibly a thunderstorm before 5am, then showers likely. Some of the storms could be severe and produce heavy rainfall. Low around 57. West wind 5 to 10 mph becoming light and variable after midnight. Winds could gust as high as 20 mph. Chance of precipitation is 80%. New precipitation amounts between a quarter and half of an inch possible.

Sunday: Showers likely, mainly before 7am. Mostly cloudy, with a high near 68. Light and variable wind becoming northwest around 5 mph in the afternoon. Chance of precipitation is 60%. New precipitation amounts between a quarter and half of an inch possible.

Sunday Night: Mostly cloudy, then gradually becoming mostly clear, with a low around 50. West wind 3 to 5 mph.

Monday: Sunny, with a high near 74. West wind around 6 mph.

Monday Night: Mostly clear, with a low around 48. Calm wind.

Tuesday: Mostly sunny, with a high near 73. Light and variable wind becoming east around 6 mph in the morning.

Tuesday Night: Mostly cloudy, with a low around 49. Light and variable wind.

Wednesday: Partly sunny, with a high near 71. Light and variable wind becoming east around 6 mph in the morning.

Wednesday Night: Partly cloudy, with a low around 51. Calm wind.

Thursday: Mostly sunny, with a high near 79. Northwest wind 3 to 6 mph.

Thursday Night: Partly cloudy, with a low around 51. North wind around 5 mph.

Friday: Sunny, with a high near 68. North wind around 6 mph.

Want more detail? Get the Complete 7 Day and Night Detailed Forecast!

Current U.S. National Radar--Current

The Current National Weather Radar is shown below with a UTC Time (subtract 5 hours from UTC to get Eastern Time).

National Weather Forecast--Current

The Current National Weather Forecast and National Weather Map are shown below.

National Weather Forecast for Tomorrow

Tomorrow National Weather Forecast and Tomorrow National Weather Map are show below.

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 Stratocumulus Clouds?

Home - Education - Cloud Types - Stratocumulus Clouds

Next Topic: Stratus Clouds

Stratocumulus clouds are similar to altocumulus clouds in their fluffy appearance, but have a slightly darker shade due to their additional mass.

A good way to distinguish the two cloud types is to hold your hand out and measure the size of an individual cloud; if it is the size of your thumb it is generally an altocumulus cloud, if it is the size of your hand it is generally a stratocumulus cloud.

It is uncommon for stratocumulus clouds to produce precipitation, but if they do it is usually a light rain or snow.

Next Topic: Stratus Clouds

Weather Topic: What are Wall Clouds?

Home - Education - Cloud Types - Wall Clouds

Wall Clouds Next Topic: Altocumulus Clouds

A wall cloud forms underneath the base of a cumulonimbus cloud, and can be a hotbed for deadly tornadoes.

Wall clouds are formed by air flowing into the cumulonimbus clouds, which can result in the wall cloud descending from the base of the cumulonimbus cloud, or rising fractus clouds which join to the base of the storm cloud as the wall cloud takes shape.

Wall clouds can be very large, and in the Northern Hemisphere they generally form at the southern edge of cumulonimbus clouds.

Next Topic: Altocumulus Clouds