Weather Alert in Utah

Recent Locations: Aydlett, NC   Carlock, IL   Lehi, UT  
Current Alerts for Lehi, UT: Red Flag Warning

Fire Weather Watch issued August 2 at 2:57AM MDT until August 4 at 9:00PM MDT by NWS Salt Lake City UT

AREAS AFFECTED: Southern Ashley National Forest; Tavaputs Plateau; Manti National Forest; San Rafael Swell; Henry Mountains; Grand Staircase

DESCRIPTION: ...FIRE WEATHER WATCH REMAINS IN EFFECT FROM MONDAY AFTERNOON THROUGH MONDAY EVENING FOR WIND AND LOW RELATIVE HUMIDITY FOR FIRE WEATHER ZONES 483, 484, 488, 489, 494, AND 498... * AFFECTED AREA...Fire Weather Zone 483 Southern Ashley National Forest, Fire Weather Zone 484 Tavaputs Plateau, Fire Weather Zone 488 Manti National Forest, Fire Weather Zone 489 San Rafael Swell, Fire Weather Zone 494 Henry Mountains and Fire Weather Zone 498 Grand Staircase. * WINDS...Southwest 10 to 20 mph with gusts to 25 to 35 mph both Saturday and Monday afternoons. Lighter winds are forecast for Sunday, remaining in the 5 to 10 mph range with gusts of 10 to 20 mph. * RELATIVE HUMIDITY...Falling into the 5 to 9 percent range each afternoon with very poor overnight recoveries. * 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 warm temperatures can contribute to extreme fire behavior. A Fire Weather Watch means that there is a potential for critical fire weather conditions. Continue to monitor for the latest forecasts and for 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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