Forecast Details for Modesto, CA

Recent Locations: Salem, OR Warren, MI Modesto, CA

Tonight: Widespread dense fog, mainly after 5am. Otherwise, increasing clouds, with a low around 51. Northwest wind around 6 mph.

Monday: Patchy fog before 10am. Otherwise, mostly cloudy, with a high near 61. Northwest wind 6 to 9 mph.

Monday Night: A 10 percent chance of rain after 4am. Cloudy, with a low around 49. Light and variable wind.

Tuesday: Rain, mainly after 4pm. High near 58. South southeast wind 3 to 6 mph. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch possible.

Tuesday Night: Rain and possibly a thunderstorm before 1am, then rain likely. Low around 51. South southeast wind around 7 mph. Chance of precipitation is 80%.

Wednesday: A chance of rain and thunderstorms. Partly sunny, with a high near 58. Chance of precipitation is 50%.

Wednesday Night: A 20 percent chance of rain before 10pm. Partly cloudy, with a low around 45.

Thursday: Mostly sunny, with a high near 58.

Thursday Night: Mostly clear, with a low around 41.

Friday: Mostly sunny, with a high near 60.

Friday Night: Mostly cloudy, with a low around 43.

Saturday: A chance of rain. Cloudy, with a high near 57.

Saturday Night: Rain likely. Cloudy, with a low around 45.

Sunday: Rain likely. Mostly cloudy, with a high near 53.

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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

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

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