Forecast Details for Saint Marks, FL

Recent Locations: Newark International Airport, NJ Cantua Creek, CA Saint Marks, FL

Tonight: A 50 percent chance of showers and thunderstorms, mainly after 2am. Mostly cloudy, with a low around 76. Southwest wind around 5 mph becoming calm in the evening. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

Sunday: Showers and thunderstorms likely, mainly after 11am. Partly sunny, with a high near 90. Heat index values as high as 100. Light and variable wind becoming south southwest 5 to 10 mph in the afternoon. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

Sunday Night: Showers and thunderstorms likely before 11pm, then showers likely and possibly a thunderstorm after 11pm. Mostly cloudy, with a low around 76. South wind around 5 mph becoming calm in the evening. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

Monday: Showers and possibly a thunderstorm before 2pm, then showers and thunderstorms between 2pm and 5pm, then showers and possibly a thunderstorm after 5pm. High near 90. Heat index values as high as 100. East wind 5 to 10 mph becoming south in the afternoon. Chance of precipitation is 90%.

Monday Night: Showers and thunderstorms likely before 8pm, then showers likely and possibly a thunderstorm between 8pm and 2am, then a chance of showers and thunderstorms after 2am. Partly cloudy, with a low around 76. South wind around 5 mph becoming calm. Chance of precipitation is 60%.

Tuesday: Showers and thunderstorms, mainly before 5pm, then showers and possibly a thunderstorm after 5pm. High near 91. Chance of precipitation is 90%.

Tuesday Night: Showers and possibly a thunderstorm before 8pm, then a chance of showers and thunderstorms after 8pm. Low around 75. Chance of precipitation is 80%.

Wednesday: Showers likely and possibly a thunderstorm, then showers and thunderstorms after 2pm. High near 92. Chance of precipitation is 80%.

Wednesday Night: Showers and thunderstorms, mainly before 8pm. Low around 75. Chance of precipitation is 80%.

Thursday: Showers and thunderstorms, mainly after 2pm. High near 92. Chance of precipitation is 80%.

Thursday Night: Showers and thunderstorms. Low around 75. Chance of precipitation is 80%.

Friday: Showers and thunderstorms. High near 93. Chance of precipitation is 80%.

Friday Night: Showers and thunderstorms. Low around 75. Chance of precipitation is 80%.

Saturday: Showers and thunderstorms likely. Mostly sunny, with a high near 93. Chance of precipitation is 70%.

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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 are Contrails?

Home - Education - Cloud Types - 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

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