Forecast Details for Johnstown, PA

Recent Locations: Johnstown, PA  
Today: Cloudy, then gradually becoming mostly sunny, with a high near 59. East wind around 5 mph becoming calm in the morning.
Tonight: Partly cloudy, with a low around 37. East wind around 5 mph becoming calm in the evening.
Friday: Mostly sunny, with a high near 64. Southeast wind 6 to 11 mph.
Friday Night: A chance of showers, mainly after 4am. Mostly cloudy, with a low around 44. Southeast wind 11 to 16 mph, with gusts as high as 24 mph. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch possible.
Saturday: Showers likely, mainly between 8am and 2pm. Mostly cloudy, with a high near 62. Southeast wind around 11 mph. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch possible.
Saturday Night: A chance of showers before 8pm. Mostly cloudy, with a low around 53. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch possible.
Sunday: Mostly sunny, with a high near 80.
Sunday Night: Mostly clear, with a low around 59.
Monday: Sunny, with a high near 84.
Monday Night: A chance of showers after 8pm. Partly cloudy, with a low around 61. Chance of precipitation is 40%.
Tuesday: Showers likely and possibly a thunderstorm. Partly sunny, with a high near 78. Chance of precipitation is 60%.
Tuesday Night: Showers and thunderstorms likely. Mostly cloudy, with a low around 55. Chance of precipitation is 60%.
Wednesday: A chance of showers. Mostly sunny, with a high near 76. Chance of precipitation is 30%.

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Current U.S. National Radar--Current

The Current National Weather Radar is shown below with a UTC Time (subtract 5 hours from UTC to get Eastern Time).

Current U.S. National Radar

National Weather Forecast--Current

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Today's National Weather Map

National Weather Forecast for Tomorrow

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

Tomorrows National Weather Map

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.

North American Water Vapor Map

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

Weather Topic: What is Rain?

Home - Education - Precipitation - Rain

Rain Next Topic: Shelf Clouds

Precipitation in the form of water droplets is called rain. Rain generally has a tendency to fall with less intensity over a greater period of time, and when rainfall is more severe it is usually less sustained.

Rain is the most common form of precipitation and happens with greater frequency depending on the season and regional influences. Cities have been shown to have an observable effect on rainfall, due to an effect called the urban heat island. Compared to upwind, monthly rainfall between twenty and forty miles downwind of cities is 30% greater.

Next Topic: Shelf Clouds