Forecast Details for Rancho Cucamonga, CA

Recent Locations: Rancho Cucamonga, CA  
Current Alerts for Rancho Cucamonga, CA: Wind Advisory
This Afternoon: Mostly sunny, with a high near 69. West wind around 15 mph, with gusts as high as 25 mph.
Tonight: Rain likely, mainly after 11pm. Cloudy, then gradually becoming partly cloudy, with a low around 50. West wind around 15 mph, with gusts as high as 30 mph. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.
Sunday: Sunny, with a high near 67. Southwest wind 10 to 15 mph, with gusts as high as 25 mph.
Sunday Night: Mostly clear, with a low around 47. Southwest wind 10 to 15 mph becoming light west after midnight. Winds could gust as high as 25 mph.
Monday: Sunny, with a high near 73. Light south wind becoming west 10 to 15 mph in the morning. Winds could gust as high as 25 mph.
Monday Night: Mostly clear, with a low around 50.
Tuesday: Sunny, with a high near 75.
Tuesday Night: Mostly clear, with a low around 51.
Wednesday: Sunny, with a high near 78.
Wednesday Night: Mostly clear, with a low around 54.
Thursday: Sunny, with a high near 81.
Thursday Night: Mostly clear, with a low around 55.
Friday: Sunny, with a high near 82.

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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

The Current National Weather Forecast and National Weather Map are shown below.

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)

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.

North American Water Vapor Map

Weather Topic: What is Condensation?

Home - Education - Precipitation - Condensation

Condensation Next Topic: Contrails

Condensation is the process which creates clouds, and therefore it is a crucial process in the water cycle. Condensation is the change of matter from a state of gas into a state of liquid, and it happens because water molecules release heat into the atmosphere and become organized into a more closely packed structure, what we might see as water droplets.

Water is always present in the air around us as a vapor, but it's too small for us to see. When water undergoes the process of condensation it becomes organized into visible water droplets. You've probably seen condensation happen before on the surface of a cold drink!

Next Topic: Contrails

Weather Topic: What are Cumulonimbus Clouds?

Home - Education - Cloud Types - Cumulonimbus Clouds

Cumulonimbus Clouds Next Topic: Cumulus Clouds

The final form taken by a growing cumulus cloud is the cumulonimbus cloud, which is very tall and dense. The tower of a cumulonimbus cloud can soar 23 km into the atmosphere, although most commonly they stop growing at an altitude of 6 km.

Even small cumulonimbus clouds appear very large in comparison to other cloud types. They can signal the approach of stormy weather, such as thunderstorms or blizzards.

Next Topic: Cumulus Clouds