Weather Alert in Utah
Red Flag Warning issued July 31 at 3:12AM MDT until July 31 at 10:00PM MDT by NWS Salt Lake City UT
AREAS AFFECTED: Color Country West Desert
DESCRIPTION: * AFFECTED AREA...Fire Weather Zone 495 Color Country West Desert. * WINDS...Southwest 15 to 25 mph with gusts to 25 to 30 mph during the afternoon and evening. * RELATIVE HUMIDITY...As low as 5 to 8 percent. Very poor overnight humidity recoveries during the morning. * IMPACTS...Critical fire weather conditions are expected. Any new fire starts or existing fires may spread rapidly.
INSTRUCTION: A Red Flag Warning means that critical fire weather conditions are either occurring now...or are imminent. A combination of strong winds...low relative humidity...and hot temperatures can contribute to extreme fire behavior.
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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
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