Forecast Details for Niwot, CO

Recent Locations: Greenwood Lake, NY Brentwood, TN Niwot, CO

Overnight: A 30 percent chance of showers. Cloudy, with a low around 58. Calm wind.

Monday: A chance of showers, with thunderstorms also possible after 9am. Mostly cloudy, with a high near 73. Calm wind becoming east northeast 5 to 8 mph in the morning. Chance of precipitation is 50%.

Monday Night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 56. Southeast wind around 5 mph becoming calm in the evening. Chance of precipitation is 50%.

Tuesday: A slight chance of showers before noon, then showers likely and possibly a thunderstorm between noon and 3pm, then showers and thunderstorms likely after 3pm. Mostly cloudy, with a high near 76. Calm wind becoming east southeast around 5 mph in the afternoon. Chance of precipitation is 70%.

Tuesday Night: Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 55. South wind around 5 mph becoming calm in the evening. Chance of precipitation is 60%.

Wednesday: A slight chance of showers before noon, then showers likely and possibly a thunderstorm between noon and 3pm, then showers and thunderstorms likely after 3pm. Mostly cloudy, with a high near 79. Chance of precipitation is 60%.

Wednesday Night: Showers likely and possibly a thunderstorm before midnight, then a chance of showers. Mostly cloudy, with a low around 55. Chance of precipitation is 70%.

Thursday: A chance of showers, with thunderstorms also possible after noon. Mostly cloudy, with a high near 77.

Thursday Night: A chance of showers and thunderstorms before midnight, then a slight chance of showers. Mostly cloudy, with a low around 54.

Friday: A slight chance of showers, then a chance of showers and thunderstorms after noon. Partly sunny, with a high near 80.

Friday Night: A chance of showers and thunderstorms. Partly cloudy, with a low around 52.

Saturday: A chance of showers and thunderstorms. Mostly sunny, with a high near 80.

Saturday Night: A slight chance of showers and thunderstorms. Partly cloudy, with a low around 52.

Sunday: A slight chance of showers and thunderstorms. Mostly sunny, with a high near 80.

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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)

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.

Weather Topic: What are Nimbostratus Clouds?

Home - Education - Cloud Types - Nimbostratus Clouds

Nimbostratus Clouds Next Topic: Precipitation

A nimbostratus cloud is similar to a stratus cloud in its formless, smooth appearance. However, a nimbostratus cloud is darker than a stratus cloud, because it is thicker.

Unlike a stratus cloud, a nimbostratus cloud typically brings with it the threat of moderate to heavy precipitation. In some cases, the precipitation may evaporate before reaching the ground, a phenomenon known as virga.

Next Topic: Precipitation

Weather Topic: What is Rain?

Home - Education - Precipitation - Rain

Rain Next Topic: Shelf Clouds

Precipitation in the form of water droplets is called rain. Rain generally has a tendency to fall with less intensity over a greater period of time, and when rainfall is more severe it is usually less sustained.

Rain is the most common form of precipitation and happens with greater frequency depending on the season and regional influences. Cities have been shown to have an observable effect on rainfall, due to an effect called the urban heat island. Compared to upwind, monthly rainfall between twenty and forty miles downwind of cities is 30% greater.

Next Topic: Shelf Clouds