Forecast Details for Gwynn Oak, MD

Recent Locations: South Sioux City, NE Omaha, TX Gwynn Oak, MD

Today: Scattered showers and thunderstorms, then showers and possibly a thunderstorm after 3pm. High near 87. Southwest wind 3 to 8 mph. Chance of precipitation is 80%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

Tonight: Showers and thunderstorms likely before 4am, then scattered showers. Patchy fog between 11pm and 1am. Otherwise, mostly cloudy, with a low around 60. North wind 3 to 6 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

Sunday: Scattered showers before 8am. Cloudy through mid morning, then gradual clearing, with a high near 75. Northwest wind around 6 mph. Chance of precipitation is 30%.

Sunday Night: Mostly clear, with a low around 54. Northwest wind around 6 mph.

Monday: Sunny, with a high near 75. Northeast wind around 6 mph.

Monday Night: Mostly clear, with a low around 54.

Tuesday: Mostly sunny, with a high near 76.

Tuesday Night: Mostly cloudy, with a low around 57.

Wednesday: Partly sunny, with a high near 75.

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

Thursday: Sunny, with a high near 81.

Thursday Night: Mostly clear, with a low around 59.

Friday: Sunny, with a high near 76.

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 is Precipitation?

Home - Education - Precipitation - Precipitation

Next Topic: Rain

Precipitation can refer to many different forms of water that may fall from clouds. Precipitation occurs after a cloud has become saturated to the point where its water particles are more dense than the air below the cloud.

In most cases, precipitation will reach the ground, but it is not uncommon for precipitation to evaporate before it reaches the earth's surface. When precipitation evaporates before it contacts the ground it is called Virga. Graupel, hail, sleet, rain, drizzle, and snow are forms of precipitation, but fog and mist are not considered precipitation because the water vapor which constitutes them isn't dense enough to fall to the ground.

Next Topic: Rain

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