Forecast Details for Grants Pass, OR

Recent Locations: Towaco, NJ Institute, WV Grants Pass, OR

Today: Patchy dense fog before 10am. Otherwise, mostly cloudy, with a high near 53. Light northwest wind.

Tonight: Patchy dense fog after 10pm. Otherwise, mostly cloudy, with a low around 35. Light and variable wind.

Thursday: Patchy dense fog before 10am. Otherwise, partly sunny, with a high near 57. Calm wind.

Thursday Night: Patchy fog after 9pm. Otherwise, mostly cloudy, with a low around 39. Calm wind.

Friday: Patchy fog before 9am. Otherwise, mostly sunny, with a high near 62. Calm wind.

Friday Night: A 20 percent chance of rain after 10pm. Mostly cloudy, with a low around 44.

Saturday: A chance of rain, then showers likely and possibly a thunderstorm after 4pm. Patchy fog between 10am and 1pm. Otherwise, mostly cloudy, with a high near 56. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

Saturday Night: Showers likely and possibly a thunderstorm before 10pm, then a chance of rain after 10pm. Patchy fog after 4am. Otherwise, mostly cloudy, with a low around 45.

Sunday: A chance of rain. Patchy fog before 10am. Otherwise, partly sunny, with a high near 59.

Sunday Night: A chance of rain, mainly before 10pm. Partly cloudy, with a low around 40.

Monday: Sunny, with a high near 61.

Monday Night: Patchy fog. Otherwise, mostly clear, with a low around 39.

Tuesday: Mostly sunny, with a high near 64.

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Current U.S. National Radar--Current

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National Weather Forecast--Current

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National Weather Forecast for Tomorrow

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North America Water Vapor (Moisture)

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Weather Topic: What are Contrails?

Home - Education - Cloud Types - Contrails

Next Topic: Cumulonimbus Clouds

A contrail is an artificial cloud, created by the passing of an aircraft.

Contrails form because water vapor in the exhaust of aircraft engines is suspended in the air under certain temperatures and humidity conditions. These contrails are called exhaust contrails.

Another type of contrail can form due to a temporary reduction in air pressure moving over the plane's surface, causing condensation. These are called aerodynamic contrails.

When you can see your breath on a cold day, it is also because of condensation. The reason contrails last longer than the condensation from your breath is because the water in contrails freezes into ice particles.

Next Topic: Cumulonimbus Clouds

Weather Topic: What are Cumulus Clouds?

Home - Education - Cloud Types - Cumulus Clouds

Next Topic: Drizzle

Cumulus clouds are fluffy and textured with rounded tops, and may have flat bottoms. The border of a cumulus cloud is clearly defined, and can have the appearance of cotton or cauliflower.

Cumulus clouds form at low altitudes (rarely above 2 km) but can grow very tall, becoming cumulus congestus and possibly the even taller cumulonimbus clouds. When cumulus clouds become taller, they have a greater chance of producing precipitation.

Next Topic: Drizzle