Forecast Details for Clarksville, PA

Recent Locations: West Henrietta, NY Clarksville, PA

Tonight: A slight chance of showers and thunderstorms before 8pm. Patchy dense fog after 11pm. Otherwise, partly cloudy, with a low around 67. Calm wind. Chance of precipitation is 20%.

Tuesday: A chance of showers and thunderstorms, mainly after 5pm. Areas of dense fog before 10am. Otherwise, mostly sunny, with a high near 88. Calm wind. Chance of precipitation is 30%.

Tuesday Night: A chance of showers and thunderstorms, mainly between 7pm and 8pm. Areas of fog after 2am. Otherwise, mostly cloudy, with a low around 69. Calm wind. Chance of precipitation is 30%.

Wednesday: Showers and thunderstorms likely, mainly after 2pm. Patchy fog before 9am. Otherwise, mostly cloudy, with a high near 88. Calm wind becoming southwest around 6 mph in the afternoon. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

Wednesday Night: Showers and thunderstorms likely before 5am, then a slight chance of showers. Mostly cloudy, with a low around 70. South wind 3 to 5 mph. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

Thursday: A slight chance of showers before 8am, then a chance of showers and thunderstorms between 8am and 2pm, then showers likely and possibly a thunderstorm after 2pm. Mostly cloudy, with a high near 89. Chance of precipitation is 70%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

Thursday Night: Showers likely and possibly a thunderstorm before 2am, then a chance of showers. Mostly cloudy, with a low around 70. Chance of precipitation is 60%.

Friday: A chance of showers before 8am, then a chance of showers and thunderstorms between 8am and 2pm, then showers likely and possibly a thunderstorm after 2pm. Mostly cloudy, with a high near 82. Chance of precipitation is 70%.

Friday Night: Showers likely and possibly a thunderstorm before 8pm, then a chance of showers and thunderstorms between 8pm and 2am. Patchy fog after 11pm. Otherwise, mostly cloudy, with a low around 68. Chance of precipitation is 60%.

Saturday: A chance of showers between 8am and 2pm, then a chance of showers and thunderstorms after 2pm. Patchy fog before 9am. Otherwise, partly sunny, with a high near 85. Chance of precipitation is 50%.

Saturday Night: A chance of showers and thunderstorms. Patchy fog. Otherwise, mostly cloudy, with a low around 68. Chance of precipitation is 40%.

Sunday: Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 86. Chance of precipitation is 60%.

Sunday Night: Showers and thunderstorms likely. Patchy fog. Otherwise, mostly cloudy, with a low around 67. Chance of precipitation is 60%.

Monday: A chance of showers and thunderstorms. Partly sunny, with a high near 85. Chance of precipitation is 50%.

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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