Forecast Details for Harleysville, PA

Recent Locations: Harleysville, PA  
Tonight: A chance of showers and thunderstorms between 3am and 5am, then showers likely and possibly a thunderstorm after 5am. Patchy fog after 1am. Otherwise, mostly cloudy, with a low around 61. South wind around 5 mph becoming calm. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Wednesday: A chance of showers and thunderstorms before 10am, then a slight chance of showers and thunderstorms after 2pm. Cloudy through mid morning, then gradual clearing, with a high near 84. Southwest wind 5 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 30%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Wednesday Night: A slight chance of showers and thunderstorms before 8pm, then a slight chance of showers after 2am. Increasing clouds, with a low around 58. West wind 5 to 10 mph. Chance of precipitation is 20%.
Thursday: Showers, mainly after 2pm. High near 72. North wind 5 to 10 mph becoming east in the morning. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.
Thursday Night: Showers, mainly before 2am. Low around 52. Northeast wind 5 to 10 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.
Friday: A chance of showers before 2pm, then a chance of showers and thunderstorms between 2pm and 5pm, then a chance of showers after 5pm. Mostly cloudy, with a high near 62. Chance of precipitation is 50%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Friday Night: A chance of showers before 2am. Mostly cloudy, with a low around 46. Chance of precipitation is 30%.
Saturday: Mostly sunny, with a high near 65.
Saturday Night: A chance of showers after 8pm. Mostly cloudy, with a low around 48. Chance of precipitation is 40%.
Sunday: A chance of showers. Partly sunny, with a high near 65. Chance of precipitation is 40%.
Sunday Night: Partly cloudy, with a low around 46.
Monday: Mostly sunny, with a high near 71.
Monday Night: Partly cloudy, with a low around 51.
Tuesday: Mostly sunny, with a high near 75.

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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.

North American Water Vapor Map

Weather Topic: What are Cumulus Clouds?

Home - Education - Cloud Types - Cumulus Clouds

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

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