Forecast Details for St. Louis, MO

Recent Locations: St. Louis, MO  
Tonight: Cloudy, then gradually becoming partly cloudy, with a low around 48. Breezy, with a north wind 13 to 21 mph, with gusts as high as 33 mph.
Friday: Mostly sunny, with a high near 63. North wind 9 to 11 mph, with gusts as high as 22 mph.
Friday Night: Partly cloudy, with a low around 46. Northwest wind 3 to 6 mph.
Saturday: Mostly sunny, with a high near 61. Northwest wind 8 to 11 mph.
Saturday Night: Mostly cloudy, with a low around 41. North wind 6 to 9 mph.
Sunday: Sunny, with a high near 61.
Sunday Night: Mostly clear, with a low around 41.
Monday: Sunny, with a high near 69.
Monday Night: A 20 percent chance of showers after 1am. Mostly cloudy, with a low around 54.
Tuesday: A 40 percent chance of showers and thunderstorms. Partly sunny, with a high near 71.
Tuesday Night: A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 48.
Wednesday: Sunny, with a high near 67.
Wednesday Night: A 20 percent chance of showers. Partly cloudy, with a low around 47.
Thursday: A 30 percent chance of showers. Mostly sunny, with a high near 69.

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Current U.S. National Radar--Current

The Current National Weather Radar is shown below with a UTC Time (subtract 5 hours from UTC to get Eastern Time).

Current U.S. National Radar

National Weather Forecast--Current

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Today's National Weather Map

National Weather Forecast for Tomorrow

Tomorrow National Weather Forecast and Tomorrow National Weather Map are show below.

Tomorrows National Weather Map

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.

North American Water Vapor Map

Weather Topic: What are Contrails?

Home - Education - Cloud Types - Contrails

Contrails Next Topic: Cumulonimbus Clouds

A contrail is an artificial cloud, created by the passing of an aircraft.

Contrails form because water vapor in the exhaust of aircraft engines is suspended in the air under certain temperatures and humidity conditions. These contrails are called exhaust contrails.

Another type of contrail can form due to a temporary reduction in air pressure moving over the plane's surface, causing condensation. These are called aerodynamic contrails.

When you can see your breath on a cold day, it is also because of condensation. The reason contrails last longer than the condensation from your breath is because the water in contrails freezes into ice particles.

Next Topic: Cumulonimbus Clouds

Weather Topic: What are Cumulus Clouds?

Home - Education - Cloud Types - Cumulus Clouds

Cumulus Clouds Next Topic: Drizzle

Cumulus clouds are fluffy and textured with rounded tops, and may have flat bottoms. The border of a cumulus cloud is clearly defined, and can have the appearance of cotton or cauliflower.

Cumulus clouds form at low altitudes (rarely above 2 km) but can grow very tall, becoming cumulus congestus and possibly the even taller cumulonimbus clouds. When cumulus clouds become taller, they have a greater chance of producing precipitation.

Next Topic: Drizzle