Weather Alert in Alaska

Recent Locations: Pine Mountain, GA Moran, WY Nenana, AK

Hydrologic Outlook issued August 13 at 12:24PM AKDT by NWS Fairbanks AK

AREAS AFFECTED: South Slopes of the Western Brooks Range; Noatak Valley; Lower Kobuk Valley; Upper Kobuk Valleys

DESCRIPTION: ESFAFG A coastal storm will continue to bring heavy rain to the south and west facing slopes of the Western Brooks Range through Thursday morning. Total rainfall has ranged from 1.5 inches in low lying areas to nearly 4 inches at elevation. Rain is expected to end early Thursday morning as the system moves east. Streams that are currently running high will remain high and start dropping slowly as rain tapers off.

INSTRUCTION: N/A

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Weather Topic: What are Cirrus Clouds?

Home - Education - Cloud Types - 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

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