Forecast Details for Saint Marys, IA

Recent Locations: Saint Marys, IA  
Overnight: Mostly cloudy, with a steady temperature around 42. East southeast wind around 8 mph.
Friday: A slight chance of showers between 2pm and 4pm. Partly sunny, with a high near 67. Breezy, with a south wind 8 to 16 mph, with gusts as high as 23 mph. Chance of precipitation is 20%.
Friday Night: A 20 percent chance of showers before 1am. Cloudy, then gradually becoming partly cloudy, with a low around 39. Breezy, with a southeast wind 6 to 16 mph becoming northwest after midnight. Winds could gust as high as 23 mph.
Saturday: Partly sunny, with a high near 57. North northwest wind 10 to 13 mph, with gusts as high as 18 mph.
Saturday Night: A 20 percent chance of showers after 1am. Mostly cloudy, with a low around 38. Northeast wind 7 to 9 mph.
Sunday: A 50 percent chance of showers. Mostly cloudy, with a high near 57. Breezy. New precipitation amounts of less than a tenth of an inch possible.
Sunday Night: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 43. Breezy. Chance of precipitation is 70%.
Monday: Showers likely and possibly a thunderstorm before 1pm, then a chance of showers and thunderstorms after 1pm. Mostly cloudy, with a high near 54. Breezy. Chance of precipitation is 60%.
Monday Night: A 40 percent chance of showers. Mostly cloudy, with a low around 36. Breezy.
Tuesday: Partly sunny, with a high near 53. Windy.
Tuesday Night: Mostly clear, with a low around 34. Breezy.
Wednesday: Sunny, with a high near 57.
Wednesday Night: Mostly clear, with a low around 36.
Thursday: Sunny, with a high near 67.

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Current U.S. National Radar--Current

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Weather Topic: What are Shelf Clouds?

Home - Education - Cloud Types - Shelf Clouds

Shelf Clouds Next Topic: Sleet

A shelf cloud is similar to a wall cloud, but forms at the front of a storm cloud, instead of at the rear, where wall clouds form.

A shelf cloud is caused by a series of events set into motion by the advancing storm; first, cool air settles along the ground where precipitation has just fallen. As the cool air is brought in, the warmer air is displaced, and rises above it, because it is less dense. When the warmer air reaches the bottom of the storm cloud, it begins to cool again, and the resulting condensation is a visible shelf cloud.

Next Topic: Sleet

Weather Topic: What is Snow?

Home - Education - Precipitation - Snow

Snow Next Topic: Stratocumulus Clouds

Snow is precipitation taking the form of ice crystals. Each ice crystal, or snowflake, has unique characteristics, but all of them grow in a hexagonal structure. Snowfall can last for sustained periods of time and result in significant buildup of snow on the ground.

On the earth's surface, snow starts out light and powdery, but as it begins to melt it tends to become more granular, producing small bits of ice which have the consistency of sand. After several cycles of melting and freezing, snow can become very dense and ice-like, commonly known as snow pack.

Next Topic: Stratocumulus Clouds