Forecast Details for Harrisburg, PA

Recent Locations: Harrisburg, PA

Current Alerts for Harrisburg, PA: Winter Weather Advisory

Today: Cloudy, then gradual clearing during the afternoon, with a high near 36. Calm wind becoming southeast around 5 mph in the afternoon.

Tonight: A slight chance of snow, freezing rain, and sleet between 3am and 4am, then a chance of snow and freezing rain. Increasing clouds, with a low around 28. Light southeast wind. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch possible.

Tuesday: Rain, snow, and freezing rain before 10am, then rain and snow between 10am and 1pm, then rain after 1pm. High near 39. Southeast wind around 6 mph. Chance of precipitation is 100%. Little or no ice accumulation expected. Little or no snow accumulation expected.

Tuesday Night: Rain. Low around 37. Calm wind. Chance of precipitation is 90%. New precipitation amounts between a quarter and half of an inch possible.

Wednesday: A chance of rain, mainly after 1pm. Cloudy, with a high near 52. Calm wind. Chance of precipitation is 50%. New precipitation amounts of less than a tenth of an inch possible.

Wednesday Night: Rain likely. Cloudy, with a low around 45. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.

Thursday: A chance of showers. Mostly cloudy, with a high near 67. Chance of precipitation is 50%.

Thursday Night: Showers likely, mainly before 1am. Mostly cloudy, with a low around 50. Chance of precipitation is 60%.

Friday: A chance of showers before 1pm. Partly sunny, with a high near 62. Chance of precipitation is 30%.

Friday Night: Mostly cloudy, with a low around 47.

Saturday: A chance of showers. Mostly cloudy, with a high near 68. Chance of precipitation is 40%.

Saturday Night: A chance of showers. Mostly cloudy, with a low around 54. Chance of precipitation is 50%.

Sunday: A chance of showers. Mostly cloudy, with a high near 69. Chance of precipitation is 30%.

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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

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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 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

Weather Topic: What are Cumulonimbus Clouds?

Home - Education - Cloud Types - Cumulonimbus Clouds

Cumulonimbus Clouds Next Topic: Cumulus Clouds

The final form taken by a growing cumulus cloud is the cumulonimbus cloud, which is very tall and dense. The tower of a cumulonimbus cloud can soar 23 km into the atmosphere, although most commonly they stop growing at an altitude of 6 km.

Even small cumulonimbus clouds appear very large in comparison to other cloud types. They can signal the approach of stormy weather, such as thunderstorms or blizzards.

Next Topic: Cumulus Clouds