Forecast Details for Merrimac, MA

Recent Locations: Silverdale, WA North Andover, MA Merrimac, MA

Tonight: A chance of showers, mainly between 3am and 5am. Patchy fog after 5am. Otherwise, cloudy, with a low around 37. East wind around 8 mph. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch possible.

Sunday: Showers likely before 2pm, then showers and possibly a thunderstorm between 2pm and 3pm, then showers after 3pm. Patchy fog before 10am. High near 53. Light and variable wind becoming southwest 5 to 7 mph in the morning. Chance of precipitation is 90%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

Sunday Night: A chance of showers before 8pm. Cloudy during the early evening, then gradual clearing, with a low around 36. West wind around 10 mph, with gusts as high as 21 mph. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch possible.

Monday: Mostly sunny, with a high near 51. West wind 9 to 13 mph.

Monday Night: A slight chance of snow after 3am. Partly cloudy, with a low around 31. West wind around 5 mph becoming calm in the evening. Chance of precipitation is 20%.

Tuesday: A chance of rain and snow showers before 11am, then a chance of rain showers between 11am and 4pm, then a chance of rain and snow showers after 4pm. Partly sunny, with a high near 47. Northwest wind 5 to 8 mph. Chance of precipitation is 40%. Little or no snow accumulation expected.

Tuesday Night: A chance of snow showers before 7pm. Partly cloudy, with a low around 23. Northwest wind around 7 mph. Chance of precipitation is 30%.

Wednesday: Sunny, with a high near 47. Light and variable wind becoming south around 6 mph in the afternoon.

Wednesday Night: Mostly clear, with a low around 30. South wind around 6 mph.

Thursday: Sunny, with a high near 57. South wind 6 to 10 mph, with gusts as high as 21 mph.

Thursday Night: Partly cloudy, with a low around 39. South wind around 7 mph.

Friday: Mostly sunny, with a high near 62. West wind around 7 mph.

Friday Night: Partly cloudy, with a low around 39. South wind around 6 mph becoming west after midnight.

Saturday: Mostly sunny, with a high near 61. Southwest wind 6 to 8 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 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

Weather Topic: What are Altostratus Clouds?

Home - Education - Cloud Types - Altostratus Clouds

Next Topic: Cirrocumulus Clouds

Altostratus clouds form at mid to high-level altitudes (between 2 and 7 km) and are created by a warm, stable air mass which causes water vapor to condense as it rise through the atmosphere. Usually altostratus clouds are featureless sheets characterized by a uniform color.

In some cases, wind punching through the cloud formation may give it a waved appearance, called altostratus undulatus. Altostratus clouds are commonly seen with other cloud formations accompanying them.

Next Topic: Cirrocumulus Clouds