Forecast Details for Sisters, OR

Recent Locations: Sullivan, NH Latta, SC Sisters, OR

Today: Rain, possibly mixed with snow. High near 39. Calm wind. Chance of precipitation is 90%. Little or no snow accumulation expected.

Tonight: Rain, mainly before 7pm. Low around 28. Calm wind. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch possible.

Sunday: A 30 percent chance of rain, mainly between 1pm and 4pm. Snow level 3900 feet rising to 5200 feet in the afternoon. Mostly cloudy, with a high near 45. Calm wind.

Sunday Night: A chance of rain before 4am, then snow, possibly mixed with rain. Low around 28. Calm wind. Chance of precipitation is 80%. New snow accumulation of less than a half inch possible.

Washington's Birthday: Rain and snow, becoming all snow after 1pm. Snow level 3700 feet lowering to 3200 feet in the afternoon . High near 38. Calm wind becoming west around 6 mph in the afternoon. Chance of precipitation is 80%. New snow accumulation of less than a half inch possible.

Monday Night: Snow likely, mainly after 4am. Mostly cloudy, with a low around 19. Chance of precipitation is 70%. New snow accumulation of less than a half inch possible.

Tuesday: Snow. High near 35. Chance of precipitation is 80%. New snow accumulation of less than a half inch possible.

Tuesday Night: A 50 percent chance of snow. Mostly cloudy, with a low around 17.

Wednesday: Snow likely, mainly after 10am. Partly sunny, with a high near 33. Chance of precipitation is 70%.

Wednesday Night: Snow likely. Mostly cloudy, with a low around 18.

Thursday: Snow likely. Partly sunny, with a high near 33.

Thursday Night: Snow likely. Mostly cloudy, with a low around 19.

Friday: Snow likely. Mostly cloudy, with a high near 36.

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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)

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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

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