Forecast Details for Johnstown, PA

Recent Locations: Manor, PA Eliot, ME Johnstown, PA

Current Alerts for Johnstown, PA: Flood Watch

Overnight: Showers. Patchy fog before 3am, then patchy fog after 5am. Low around 41. Southeast wind around 10 mph, with gusts as high as 25 mph. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.

Friday: Showers likely, mainly before 8am. Patchy fog between 8am and 9am. Otherwise, cloudy through mid morning, then gradual clearing, with a high near 60. Southeast wind 9 to 13 mph becoming west in the afternoon. Winds could gust as high as 29 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.

Friday Night: A slight chance of rain showers and sleet before 10pm, then a slight chance of rain showers, snow showers, and sleet between 10pm and 1am. Mostly cloudy, with a low around 33. West wind around 10 mph, with gusts as high as 26 mph. Chance of precipitation is 20%.

Saturday: Partly sunny, with a high near 44. West wind 6 to 10 mph, with gusts as high as 23 mph.

Saturday Night: A chance of rain and snow showers between 1am and 4am, then a chance of snow showers after 4am. Mostly cloudy, with a low around 31. Calm wind. Chance of precipitation is 40%. New precipitation amounts of less than a tenth of an inch possible.

Sunday: Snow showers. High near 37. Chance of precipitation is 80%. New snow accumulation of 1 to 3 inches possible.

Sunday Night: Snow showers, mainly before 1am. Low around 26. Chance of precipitation is 80%.

Monday: A chance of snow showers. Mostly cloudy, with a high near 34. Chance of precipitation is 50%.

Monday Night: Mostly cloudy, with a low around 18.

Tuesday: Partly sunny, with a high near 31.

Tuesday Night: Mostly cloudy, with a low around 21.

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 32. Chance of precipitation is 60%.

Thursday: A chance of showers. Mostly cloudy, 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 Altocumulus Clouds?

Home - Education - Cloud Types - Altocumulus Clouds

Next Topic: Altostratus Clouds

Similar to cirrocumulus clouds, altocumulus clouds are characterized by cloud patches. They are distinguished by larger cloudlets than cirrocumulus clouds but are still smaller than stratocumulus clouds.

Altocumulus clouds most commonly form in middle altitudes (between 2 and 5 km) and may resemble, at times, the shape of a flying saucer. These uncommon formations, called altocumulus lenticularis, are created by uplift in the atmosphere and are most often seen in close proximity to mountains.

Next Topic: Altostratus Clouds

Weather Topic: What are Cirrocumulus Clouds?

Home - Education - Cloud Types - Cirrocumulus Clouds

Next Topic: Cirrostratus Clouds

Cirrocumulus clouds form at high altitudes (usually around 5 km) and have distinguishing characteristics displayed in a fine layer of small cloud patches. These small cloud patches are sometimes referred to as "cloudlets" in relation to the whole cloud formation.

Cirrocumulus clouds are formed from ice crystals and water droplets. Often, the water droplets in the cloud freeze into ice crystals and the cloud becomes a cirrostratus cloud. Because of this common occurrence, cirrocumulus cloud formations generally pass rapidly.

Next Topic: Cirrostratus Clouds