Forecast Details for St. Louis, MO

Recent Locations: St. Louis, MO

Tonight: Sleet, possibly mixed with snow. Low around 24. East wind 6 to 10 mph, with gusts as high as 22 mph. Chance of precipitation is 90%. Total nighttime snow and sleet accumulation of 1 to 2 inches possible.

Sunday: Sleet, possibly mixed with snow and freezing rain before 1pm, then sleet between 1pm and 3pm, then sleet, possibly mixed with snow after 3pm. The sleet could be heavy at times. High near 26. East wind 11 to 16 mph, with gusts as high as 31 mph. Chance of precipitation is 100%. Little or no ice accumulation expected. New snow and sleet accumulation of 1 to 3 inches possible.

Sunday Night: Snow, freezing rain, and sleet, becoming all snow after midnight. The snow could be heavy at times. Patchy blowing snow between midnight and 1am. Low around 21. Northeast wind around 16 mph becoming north after midnight. Winds could gust as high as 31 mph. Chance of precipitation is 90%. New ice accumulation of less than a 0.1 of an inch possible. New snow and sleet accumulation of 1 to 3 inches possible.

Monday: A 20 percent chance of snow before noon. Mostly cloudy, with a high near 24. Northwest wind 9 to 14 mph, with gusts as high as 24 mph.

Monday Night: Partly cloudy, with a low around 6. Northwest wind 3 to 8 mph.

Tuesday: Mostly sunny, with a high near 23.

Tuesday Night: Partly cloudy, with a low around 5.

Wednesday: Sunny and cold, with a high near 20.

Wednesday Night: Mostly clear, with a low around 2.

Thursday: Sunny, with a high near 28.

Thursday Night: Mostly cloudy, with a low around 17.

Friday: A 20 percent chance of snow. Mostly cloudy, with a high near 31.

Friday Night: Mostly cloudy, with a low around 15.

Saturday: Mostly sunny, with a high near 30.

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Current U.S. National Radar--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 Condensation?

Home - Education - Precipitation - Condensation

Next Topic: Contrails

Condensation is the process which creates clouds, and therefore it is a crucial process in the water cycle. Condensation is the change of matter from a state of gas into a state of liquid, and it happens because water molecules release heat into the atmosphere and become organized into a more closely packed structure, what we might see as water droplets.

Water is always present in the air around us as a vapor, but it's too small for us to see. When water undergoes the process of condensation it becomes organized into visible water droplets. You've probably seen condensation happen before on the surface of a cold drink!

Next Topic: Contrails

Weather Topic: What are Cumulonimbus Clouds?

Home - Education - Cloud Types - Cumulonimbus Clouds

Cumulonimbus Clouds Next Topic: Cumulus Clouds

The final form taken by a growing cumulus cloud is the cumulonimbus cloud, which is very tall and dense. The tower of a cumulonimbus cloud can soar 23 km into the atmosphere, although most commonly they stop growing at an altitude of 6 km.

Even small cumulonimbus clouds appear very large in comparison to other cloud types. They can signal the approach of stormy weather, such as thunderstorms or blizzards.

Next Topic: Cumulus Clouds