Forecast Details for Saint Helens, OR

Recent Locations: Saint Helens, OR  
Tonight: A chance of showers and thunderstorms before 9pm, then a slight chance of showers between 9pm and 10pm. Patchy fog after 2am. Otherwise, mostly cloudy, with a low around 39. Northwest wind around 6 mph becoming calm in the evening. Chance of precipitation is 40%.
Wednesday: Patchy fog before 8am. Otherwise, mostly cloudy, with a high near 58. Calm wind becoming south around 5 mph in the afternoon.
Wednesday Night: Rain likely, mainly between 11pm and 5am. Mostly cloudy, with a low around 43. South wind around 5 mph becoming light and variable in the evening. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.
Thursday: A 30 percent chance of showers. Mostly cloudy, then gradually becoming sunny, with a high near 64. Light and variable wind becoming south around 5 mph in the afternoon.
Thursday Night: A 10 percent chance of showers after 5am. Patchy fog between 3am and 4am. Otherwise, mostly clear, with a low around 44. Southwest wind around 6 mph becoming calm in the evening.
Friday: Rain likely, mainly after 11am. Partly sunny, with a high near 62. Chance of precipitation is 60%.
Friday Night: Showers. Low around 47. Chance of precipitation is 90%.
Saturday: Showers. Mostly cloudy, with a high near 57.
Saturday Night: A chance of showers. Mostly cloudy, with a low around 45.
Sunday: A chance of showers. Mostly cloudy, with a high near 58.
Sunday Night: Showers likely. Mostly cloudy, with a low around 46.
Monday: Showers. Mostly cloudy, with a high near 58.
Monday Night: Showers likely. Mostly cloudy, with a low around 43.
Tuesday: Showers. Mostly cloudy, with a high near 56.

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Current U.S. National Radar--Current

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Current U.S. National Radar

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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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North American Water Vapor Map

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

Weather Topic: What are Wall Clouds?

Home - Education - Cloud Types - Wall Clouds

Wall Clouds Next Topic: Altocumulus Clouds

A wall cloud forms underneath the base of a cumulonimbus cloud, and can be a hotbed for deadly tornadoes.

Wall clouds are formed by air flowing into the cumulonimbus clouds, which can result in the wall cloud descending from the base of the cumulonimbus cloud, or rising fractus clouds which join to the base of the storm cloud as the wall cloud takes shape.

Wall clouds can be very large, and in the Northern Hemisphere they generally form at the southern edge of cumulonimbus clouds.

Next Topic: Altocumulus Clouds