Forecast Details for Holtwood, PA

Recent Locations: Saint Michael, MN Malvern, AR Holtwood, PA

Tonight: Rain likely before 4am, then a slight chance of showers between 4am and 5am. Patchy fog after midnight. Otherwise, cloudy, with a low around 34. South wind 3 to 6 mph. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.

Wednesday: A chance of showers, mainly after noon. Areas of fog before 8am. Otherwise, cloudy, with a high near 54. Calm wind. Chance of precipitation is 50%. New precipitation amounts of less than a tenth of an inch possible.

Wednesday Night: Showers, mainly after 1am. Low around 45. Calm wind. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.

Thursday: Showers likely. Cloudy, with a high near 59. Calm wind becoming southeast around 5 mph in the afternoon. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.

Thursday Night: Showers likely and possibly a thunderstorm. Cloudy, with a low around 49. Southeast wind around 5 mph becoming southwest after midnight. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

Friday: A slight chance of showers before 1pm. Partly sunny, with a high near 68. Chance of precipitation is 20%.

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

Saturday: A chance of showers after 1pm. Partly sunny, with a high near 63. Chance of precipitation is 30%.

Saturday Night: Showers likely, mainly before 1am. Mostly cloudy, with a low around 54. Chance of precipitation is 60%.

Sunday: Partly sunny, with a high near 61.

Sunday Night: Partly cloudy, with a low around 51.

Monday: Partly sunny, with a high near 67.

Monday Night: Partly cloudy, with a low around 49.

Tuesday: Mostly sunny, with a high near 69.

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North America Water Vapor (Moisture)

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Weather Topic: What is Precipitation?

Home - Education - Precipitation - Precipitation

Next Topic: Rain

Precipitation can refer to many different forms of water that may fall from clouds. Precipitation occurs after a cloud has become saturated to the point where its water particles are more dense than the air below the cloud.

In most cases, precipitation will reach the ground, but it is not uncommon for precipitation to evaporate before it reaches the earth's surface. When precipitation evaporates before it contacts the ground it is called Virga. Graupel, hail, sleet, rain, drizzle, and snow are forms of precipitation, but fog and mist are not considered precipitation because the water vapor which constitutes them isn't dense enough to fall to the ground.

Next Topic: Rain

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