Forecast Details for Johnstown, PA

Recent Locations: Greenville, MS Lincoln, MI Johnstown, PA

This Afternoon: Rain, mainly before 3pm. High near 56. Southwest wind 6 to 8 mph. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch possible.

Tonight: A chance of rain, mainly before 8pm. Mostly cloudy, with a low around 46. West wind around 6 mph becoming calm after midnight. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch possible.

Thursday: Rain likely, mainly after 1pm. Cloudy, with a high near 55. Calm wind becoming southeast 5 to 7 mph in the afternoon. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch possible.

Thursday Night: Rain. Low around 39. Southeast wind 6 to 8 mph, with gusts as high as 21 mph. Chance of precipitation is 90%. New precipitation amounts between a quarter and half of an inch possible.

Friday: Rain likely, mainly before 1pm. Mostly cloudy, with a high near 58. Southeast wind 7 to 10 mph becoming west in the afternoon. Winds could gust as high as 25 mph. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch possible.

Friday Night: A slight chance of rain, mixing with snow after 10pm, then gradually ending. Partly cloudy, with a low around 34. Chance of precipitation is 20%.

Saturday: Mostly sunny, with a high near 46.

Saturday Night: A chance of snow after 1am. Mostly cloudy, with a low around 31. Chance of precipitation is 40%.

Sunday: Snow likely. Mostly cloudy, with a high near 38. Chance of precipitation is 70%.

Sunday Night: A chance of snow. Mostly cloudy, with a low around 24. Chance of precipitation is 50%.

Monday: A chance of snow. Mostly cloudy, with a high near 33. Chance of precipitation is 30%.

Monday Night: Mostly cloudy, with a low around 15.

Tuesday: Partly sunny, with a high near 28.

Want more detail? Get the Complete 7 Day and Night Detailed Forecast!

Current U.S. National Radar--Current

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National Weather Forecast--Current

The Current National Weather Forecast and National Weather Map are shown below.

National Weather Forecast for Tomorrow

Tomorrow National Weather Forecast and Tomorrow National Weather Map are show below.

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.

Weather Topic: What are Altostratus Clouds?

Home - Education - Cloud Types - Altostratus Clouds

Next Topic: Cirrocumulus Clouds

Altostratus clouds form at mid to high-level altitudes (between 2 and 7 km) and are created by a warm, stable air mass which causes water vapor to condense as it rise through the atmosphere. Usually altostratus clouds are featureless sheets characterized by a uniform color.

In some cases, wind punching through the cloud formation may give it a waved appearance, called altostratus undulatus. Altostratus clouds are commonly seen with other cloud formations accompanying them.

Next Topic: Cirrocumulus Clouds

Weather Topic: What are Cirrostratus Clouds?

Home - Education - Cloud Types - Cirrostratus Clouds

Next Topic: Cirrus Clouds

Cirrostratus clouds are high, thin clouds that form above 20,000 feet and are made mostly of ice crystals. They sometimes look like giant feathers, horse tails, or curls of hair in the sky. These clouds are pushed by the jet stream and can move at high speeds reaching 100 mph.

What do they indicate?
They indicate that a precipitation is likely within 24 hours.

Next Topic: Cirrus Clouds