Forecast Details for Holtsville, NY

Recent Locations: Cedarville, WV Hague, ND Holtsville, NY

This Afternoon: Mostly cloudy, with a high near 39. Southwest wind 6 to 9 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: Rain likely, mainly before 10pm. Cloudy, with a low around 32. Light northeast wind. Chance of precipitation is 60%.

Thursday: Mostly cloudy, with a high near 39. East 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 42.

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.

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

Current U.S. National Radar--Current

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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 Cirrostratus Clouds?

Home - Education - Cloud Types - Cirrostratus Clouds

Next Topic: Cirrus Clouds

Cirrostratus clouds are high, thin clouds that form above 20,000 feet and are made mostly of ice crystals. They sometimes look like giant feathers, horse tails, or curls of hair in the sky. These clouds are pushed by the jet stream and can move at high speeds reaching 100 mph.

What do they indicate?
They indicate that a precipitation is likely within 24 hours.

Next Topic: Cirrus Clouds

Weather Topic: What is Condensation?

Home - Education - Precipitation - Condensation

Next Topic: Contrails

Condensation is the process which creates clouds, and therefore it is a crucial process in the water cycle. Condensation is the change of matter from a state of gas into a state of liquid, and it happens because water molecules release heat into the atmosphere and become organized into a more closely packed structure, what we might see as water droplets.

Water is always present in the air around us as a vapor, but it's too small for us to see. When water undergoes the process of condensation it becomes organized into visible water droplets. You've probably seen condensation happen before on the surface of a cold drink!

Next Topic: Contrails