Forecast Details for Holtsville, NY

Recent Locations: Holtsville, NY

Current Alerts for Holtsville, NY: Flood Watch

Overnight: Showers likely, mainly after 5am. Mostly cloudy, with a steady temperature around 56. Light east wind. Chance of precipitation is 70%.

Friday: Showers, with thunderstorms also possible after 11am. Some of the storms could produce heavy rainfall. High near 62. Southeast wind 6 to 11 mph. Chance of precipitation is 100%. New rainfall amounts between 1 and 2 inches possible.

Friday Night: Showers and thunderstorms before 11pm, then a chance of showers. Low around 49. Southeast wind around 7 mph becoming west after midnight. Chance of precipitation is 80%. New precipitation amounts between a quarter and half of an inch possible.

Saturday: Mostly sunny, with a high near 68. West wind 11 to 14 mph.

Saturday Night: Mostly clear, with a low around 52. West wind around 6 mph.

Sunday: Sunny, with a high near 69.

Sunday Night: Mostly clear, with a low around 50.

Monday: Sunny, with a high near 68.

Monday Night: Partly cloudy, with a low around 55.

Tuesday: Mostly sunny, with a high near 72.

Tuesday Night: A 30 percent chance of showers. Mostly cloudy, with a low around 57.

Wednesday: A 40 percent chance of showers. Mostly cloudy, with a high near 69.

Wednesday Night: A 50 percent chance of showers. Mostly cloudy, with a low around 58.

Thursday: A 30 percent chance of showers. Mostly cloudy, with a high near 72.

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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 Cumulus Clouds?

Home - Education - Cloud Types - Cumulus Clouds

Next Topic: Drizzle

Cumulus clouds are fluffy and textured with rounded tops, and may have flat bottoms. The border of a cumulus cloud is clearly defined, and can have the appearance of cotton or cauliflower.

Cumulus clouds form at low altitudes (rarely above 2 km) but can grow very tall, becoming cumulus congestus and possibly the even taller cumulonimbus clouds. When cumulus clouds become taller, they have a greater chance of producing precipitation.

Next Topic: Drizzle

Weather Topic: What is Evaporation?

Home - Education - Precipitation - Evaporation

Next Topic: Fog

Evaporation is the process which returns water from the earth back to the atmosphere, and is another crucial process in the water cycle.

Evaporation is the transformation of liquid into gas, and it happens because molecules are excited by the application of energy and turn into vapor. In order for water to evaporate it has to be on the surface of a body of water.

Next Topic: Fog