Forecast Details for Macungie, PA

Recent Locations: Macungie, PA

This Afternoon: Sunny, with a high near 67. South wind 10 to 15 mph.

Tonight: A chance of showers, mainly after 4am. Increasing clouds, with a low around 49. South wind 10 to 15 mph. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch possible.

Wednesday: A slight chance of showers, with thunderstorms also possible after 2pm. Mostly cloudy, with a high near 64. Southwest wind 10 to 15 mph becoming northwest in the afternoon. Winds could gust as high as 30 mph. Chance of precipitation is 20%.

Wednesday Night: Mostly clear, with a low around 34. North wind 5 to 15 mph.

Thursday: Sunny, with a high near 59. Northeast wind around 5 mph.

Thursday Night: Mostly clear, with a low around 34.

Friday: Sunny, with a high near 62.

Friday Night: Partly cloudy, with a low around 39.

Saturday: Mostly cloudy, with a high near 61.

Saturday Night: Mostly cloudy, with a low around 50.

Sunday: Partly sunny, with a high near 76.

Sunday Night: Partly cloudy, with a low around 57.

Monday: A chance of showers. Mostly sunny, with a high near 81. Chance of precipitation is 30%.

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

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).

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 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

Weather Topic: What is Snow?

Home - Education - Precipitation - Snow

Snow Next Topic: Stratocumulus Clouds

Snow is precipitation taking the form of ice crystals. Each ice crystal, or snowflake, has unique characteristics, but all of them grow in a hexagonal structure. Snowfall can last for sustained periods of time and result in significant buildup of snow on the ground.

On the earth's surface, snow starts out light and powdery, but as it begins to melt it tends to become more granular, producing small bits of ice which have the consistency of sand. After several cycles of melting and freezing, snow can become very dense and ice-like, commonly known as snow pack.

Next Topic: Stratocumulus Clouds