Forecast Details for Johnstown, PA

Recent Locations: Dewar, OK Cecil, GA Johnstown, PA

Current Alerts for Johnstown, PA: Flood Watch

Tonight: Rain. Patchy fog before 3am, then patchy fog after 5am. Low around 41. Southeast wind 8 to 10 mph, with gusts as high as 24 mph. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.

Friday: Rain, mainly before 10am. Patchy fog between 8am and 9am. High near 56. Southeast wind 8 to 11 mph becoming west in the afternoon. Winds could gust as high as 26 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.

Friday Night: Mostly cloudy, with a low around 33. West wind around 10 mph, with gusts as high as 26 mph.

Saturday: Mostly sunny, with a high near 46. West wind 6 to 10 mph, with gusts as high as 21 mph.

Saturday Night: A chance of rain and snow after 1am. Mostly cloudy, with a low around 30. Calm wind. Chance of precipitation is 40%. New precipitation amounts of less than a tenth of an inch possible.

Sunday: Snow likely, possibly mixed with rain before 7am, then snow likely between 7am and 1pm, then snow, possibly mixed with rain after 1pm. High near 38. Chance of precipitation is 80%. New snow accumulation of 2 to 4 inches possible.

Sunday Night: Snow showers likely. Mostly cloudy, with a low around 26. Chance of precipitation is 60%.

Monday: A chance of snow showers. Mostly cloudy, with a high near 35. Chance of precipitation is 50%.

Monday Night: Mostly cloudy, with a low around 19.

Tuesday: Partly sunny, with a high near 31.

Tuesday Night: A chance of snow showers. Mostly cloudy, with a low around 21. Chance of precipitation is 30%.

Wednesday: A chance of rain and snow showers. Mostly cloudy, with a high near 43. Chance of precipitation is 50%.

Wednesday Night: Showers likely. Mostly cloudy, with a low around 33. Chance of precipitation is 60%.

Thursday: A chance of showers. Partly sunny, with a high near 42. Chance of precipitation is 40%.

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North America Water Vapor (Moisture)

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Weather Topic: What are Hole Punch Clouds?

Home - Education - Cloud Types - Hole Punch Clouds

Hole Punch Clouds Next Topic: Mammatus Clouds

A hole punch cloud is an unusual occurrence when a disk-shaped hole appears in a cirrostratus, cirrocumulus, or altocumulus cloud.

When part of the cloud forms ice crystals, water droplets in the surrounding area of the cloud evaporate. The effect of this process produces a large elliptical gap in the cloud. The hole punch cloud formation is rare, but it is not specific to any geographic area.

Other names which have been used to describe this phenomena include fallstreak hole, skypunch, and cloud hole.

Next Topic: Mammatus Clouds

Weather Topic: What are Nimbostratus Clouds?

Home - Education - Cloud Types - Nimbostratus Clouds

Nimbostratus Clouds Next Topic: Precipitation

A nimbostratus cloud is similar to a stratus cloud in its formless, smooth appearance. However, a nimbostratus cloud is darker than a stratus cloud, because it is thicker.

Unlike a stratus cloud, a nimbostratus cloud typically brings with it the threat of moderate to heavy precipitation. In some cases, the precipitation may evaporate before reaching the ground, a phenomenon known as virga.

Next Topic: Precipitation