Weather Alert in California

Recent Locations: Grand Terrace, CA   Moose Lake, MN   Sioux City, IA  
Current Alerts for Grand Terrace, CA: Severe Thunderstorm Warning Wind Advisory
Winter Storm Warning

Winter Storm Warning issued February 17 at 3:00PM PST until February 19 at 6:00AM PST by NWS Eureka CA

AREAS AFFECTED: Del Norte Interior; Northern Humboldt Interior; Southern Humboldt Interior

DESCRIPTION: ...PERIODS OF RAIN AND SNOW SHOWERS WILL CONTINUE THROUGH THURSDAY MORNING... .Rain, snow and small hail showers are expected to diminish tonight and Wednesday with another round of low snow, rain and small hail Wednesday night evening through early Thursday morning. * WHAT...Heavy snow snow levels falling to 1000 feet Tuesday night. Additional snow accumulations between 5 and 17 inches. * WHERE...Humboldt Interior, and Del Norte Interior. * WHEN...Until 6 AM PST Thursday. * IMPACTS...Travel could be very difficult to impossible. Tire chains may be necessary if travelling through mountain passes.

INSTRUCTION: If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. Persons should delay all travel if possible. If travel is absolutely necessary, drive with extreme caution and be prepared for sudden changes in visibility. Leave plenty of room between you and the motorist ahead of you, and allow extra time to reach your destination. Avoid sudden braking or acceleration, and be especially cautious on hills or when making turns. Make sure your car is winterized and in good working order.

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Weather Topic: What are Cirrus Clouds?

Home - Education - Cloud Types - Cirrus Clouds

Cirrus Clouds Next Topic: Condensation

Cirrus clouds are high-level clouds that occur above 20,000 feet and are composed mainly of ice crystals. They are thin and wispy in appearance.

What do they indicate?
They are often the first sign of an approaching storm.

Next Topic: Condensation

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

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