Weather Alert in Colorado

Fire Weather Watch issued July 25 at 2:05AM MDT until July 26 at 8:00PM MDT by NWS Grand Junction CO

AREAS AFFECTED: Little Snake; White River; Southwest Colorado Lower Forecast Area; Paradox Valley; North Fork; Southwest Colorado Upper West Forecast Area; Eastern Ashley National Forest; Eastern Uintah Basin; Book Cliffs; Colorado River Basin; Southeast Utah

DESCRIPTION: The National Weather Service in Grand Junction has issued a Fire Weather Watch for gusty winds, low relative humidity and dry fuels, which is in effect from Saturday afternoon through Saturday evening. * AFFECTED AREA...In Colorado, Fire Weather Zone 200 Little Snake Forecast Area, Fire Weather Zone 202 White River Forecast Area, Fire Weather Zone 207 Southwest Colorado Lower Forecast Area, Fire Weather Zone 290 Paradox Valley Forecast Area, Fire Weather Zone 292 North Fork Forecast Area and Fire Weather Zone 294 Southwest Colorado Upper West Forecast Area. In Utah, Fire Weather Zone 485 Eastern Ashley National Forest, Fire Weather Zone 486 Eastern Uinta Basin, Fire Weather Zone 487 Book Cliffs, Fire Weather Zone 490 Colorado River Basin and Fire Weather Zone 491 Southeast Utah. * TIMING...From Saturday afternoon through Saturday evening. * WINDS...Southwest 10 to 20 mph with gusts up to 30 mph. * RELATIVE HUMIDITY...6 to 11 percent. * IMPACTS...Any fire that develops will catch and spread quickly. Outdoor burning is not recommended.

INSTRUCTION: A Fire Weather Watch means that critical fire weather conditions are forecast to occur. Listen for later forecasts and possible Red Flag Warnings.

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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

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