Forecast Details for Walnut, CA

Recent Locations: Walnut, CA  
Overnight: Patchy fog. Otherwise, mostly cloudy, with a low around 63. Calm wind.
Sunday: Patchy fog before 11am. Otherwise, mostly cloudy through mid morning, then gradual clearing, with a high near 89. Light west northwest wind becoming west southwest 10 to 15 mph in the afternoon. Winds could gust as high as 20 mph.
Sunday Night: Patchy fog after 11pm. Otherwise, increasing clouds, with a low around 62. South southwest wind 5 to 15 mph.
Monday: Patchy fog before 11am. Otherwise, mostly cloudy through mid morning, then gradual clearing, with a high near 88. West southwest wind 5 to 10 mph.
Monday Night: Mostly clear, with a low around 60. West southwest wind 5 to 10 mph.
Tuesday: Sunny, with a high near 86.
Tuesday Night: Patchy fog after 11pm. Otherwise, mostly cloudy, with a low around 60.
Wednesday: Patchy fog before 11am. Otherwise, mostly sunny, with a high near 84.
Wednesday Night: Patchy fog after 11pm. Otherwise, mostly cloudy, with a low around 59.
Thursday: Patchy fog before 11am. Otherwise, mostly sunny, with a high near 85.
Thursday Night: Clear, with a low around 61.
Friday: Sunny, with a high near 90.
Friday Night: Clear, with a low around 63.
Saturday: Sunny, with a high near 95.

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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)

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North American Water Vapor Map

Weather Topic: What are Cirrus Clouds?

Home - Education - Cloud Types - Cirrus Clouds

Cirrus Clouds Next Topic: Condensation

Cirrus clouds are high-level clouds that occur above 20,000 feet and are composed mainly of ice crystals. They are thin and wispy in appearance.

What do they indicate?
They are often the first sign of an approaching storm.

Next Topic: Condensation

Weather Topic: What are Contrails?

Home - Education - Cloud Types - Contrails

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