Forecast Details for Commack, NY

Recent Locations: Moore, ID Roebuck, SC Commack, NY

This Afternoon: Partly sunny, with a high near 41. Southwest wind 6 to 8 mph.

Tonight: Widespread dense fog, mainly after 1am. Otherwise, increasing clouds, with a low around 32. Calm wind.

Wednesday: Drizzle likely before 10am, then rain likely, mainly between 10am and 2pm. The drizzle could be heavy at times. Areas of dense fog before 10am. Otherwise, cloudy, with a high near 41. Calm wind becoming southeast around 5 mph. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.

Wednesday Night: A 50 percent chance of rain before 1am. Cloudy, with a low around 32. Calm wind becoming northeast around 5 mph after midnight.

Thursday: Mostly cloudy, with a high near 39. Northeast wind 5 to 7 mph.

Thursday Night: A chance of rain after 1am, mixing with snow after 4am. Cloudy, with a steady temperature around 34. Chance of precipitation is 40%.

Friday: Rain likely, possibly mixed with snow before 7am, then rain. High near 40. Chance of precipitation is 90%.

Friday Night: Rain likely, mainly before 1am. Mostly cloudy, with a low around 32. Chance of precipitation is 60%.

Saturday: Partly sunny, with a high near 43.

Saturday Night: Mostly cloudy, with a low around 29.

Sunday: A 50 percent chance of snow. Mostly cloudy, with a high near 37.

Sunday Night: A 50 percent chance of snow. Mostly cloudy, with a low around 27.

Monday: A 40 percent chance of snow. Mostly cloudy, with a high near 35.

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Current U.S. National Radar--Current

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National Weather Forecast--Current

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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 Shelf Clouds?

Home - Education - Cloud Types - Shelf Clouds

Shelf Clouds Next Topic: Sleet

A shelf cloud is similar to a wall cloud, but forms at the front of a storm cloud, instead of at the rear, where wall clouds form.

A shelf cloud is caused by a series of events set into motion by the advancing storm; first, cool air settles along the ground where precipitation has just fallen. As the cool air is brought in, the warmer air is displaced, and rises above it, because it is less dense. When the warmer air reaches the bottom of the storm cloud, it begins to cool again, and the resulting condensation is a visible shelf cloud.

Next Topic: Sleet

Weather Topic: What is Snow?

Home - Education - Precipitation - Snow

Snow Next Topic: Stratocumulus Clouds

Snow is precipitation taking the form of ice crystals. Each ice crystal, or snowflake, has unique characteristics, but all of them grow in a hexagonal structure. Snowfall can last for sustained periods of time and result in significant buildup of snow on the ground.

On the earth's surface, snow starts out light and powdery, but as it begins to melt it tends to become more granular, producing small bits of ice which have the consistency of sand. After several cycles of melting and freezing, snow can become very dense and ice-like, commonly known as snow pack.

Next Topic: Stratocumulus Clouds