Forecast Details for Calpella, CA

Recent Locations: Calpella, CA  
Tonight: Patchy fog between 2am and 5am. Otherwise, mostly cloudy, with a low around 39. West northwest wind 5 to 7 mph becoming calm in the evening.
Friday: Rain, mainly after 11am. Patchy fog between 8am and 11am. High near 63. Calm wind becoming south southwest 5 to 9 mph in the afternoon. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch possible.
Friday Night: Rain before 8pm, then showers and possibly a thunderstorm, mainly after 8pm. Low around 42. South wind 5 to 14 mph becoming west northwest after midnight. Winds could gust as high as 20 mph. Chance of precipitation is 100%. New rainfall amounts between a quarter and half of an inch possible.
Saturday: A 20 percent chance of rain before 11am. Sunny, with a high near 65. Northwest wind 7 to 11 mph.
Saturday Night: Mostly clear, with a low around 39. Northwest wind 9 to 14 mph becoming light north northwest after midnight.
Sunday: Sunny, with a high near 68. Calm wind becoming northwest around 6 mph in the afternoon.
Sunday Night: Clear, with a low around 38.
Monday: Sunny, with a high near 74.
Monday Night: Patchy fog after 5am. Otherwise, mostly clear, with a low around 38.
Tuesday: Patchy fog before 8am. Otherwise, mostly sunny, with a high near 76.
Tuesday Night: Mostly clear, with a low around 40.
Wednesday: Sunny, with a high near 78.
Wednesday Night: Clear, with a low around 41.
Thursday: Sunny, with a high near 79.

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Current U.S. National Radar--Current

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Current U.S. National Radar

National Weather Forecast--Current

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Today's National Weather Map

National Weather Forecast for Tomorrow

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North America Water Vapor (Moisture)

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Weather Topic: What is Sleet?

Home - Education - Precipitation - Sleet

Sleet Next Topic: Snow

Sleet is a form of precipitation in which small ice pellets are the primary components. These ice pellets are smaller and more translucent than hailstones, and harder than graupel. Sleet is caused by specific atmospheric conditions and therefore typically doesn't last for extended periods of time.

The condition which leads to sleet formation requires a warmer body of air to be wedged in between two sub-freezing bodies of air. When snow falls through a warmer layer of air it melts, and as it falls through the next sub-freezing body of air it freezes again, forming ice pellets known as sleet. In some cases, water droplets don't have time to freeze before reaching the surface and the result is freezing rain.

Next Topic: Snow

Weather Topic: What are Stratocumulus Clouds?

Home - Education - Cloud Types - Stratocumulus Clouds

Stratocumulus Clouds Next Topic: Stratus Clouds

Stratocumulus clouds are similar to altocumulus clouds in their fluffy appearance, but have a slightly darker shade due to their additional mass.

A good way to distinguish the two cloud types is to hold your hand out and measure the size of an individual cloud; if it is the size of your thumb it is generally an altocumulus cloud, if it is the size of your hand it is generally a stratocumulus cloud.

It is uncommon for stratocumulus clouds to produce precipitation, but if they do it is usually a light rain or snow.

Next Topic: Stratus Clouds