Weather Alert in Arizona
Dust Advisory issued September 3 at 8:39PM MST until September 3 at 9:45PM MST by NWS Phoenix AZ
AREAS AFFECTED: Maricopa, AZ
DESCRIPTION: The National Weather Service in Phoenix has issued a * Dust Advisory for... Maricopa County in south central Arizona... * Until 945 PM MST. * At 839 PM MST, a wall of dust was along a line extending from Falcon Field Airport to Downtown Scottsdale to Downtown Phoenix, moving north at 25 mph. HAZARD...Less than one mile visibility with strong wind in excess of 40 mph. SOURCE...Doppler radar. IMPACT...Hazardous travel. * This includes the following highways... AZ Interstate 10 between mile markers 137 and 156. AZ Interstate 17 between mile markers 195 and 222. AZ Route 51 between mile markers 1 and 15. Locations impacted include... Phoenix, Mesa, Glendale, Scottsdale, Tempe, Peoria, Fountain Hills, Paradise Valley, Laveen, East Mesa, Sun City, Cave Creek, Tempe Marketplace, Papago Park, and Piestewa Peak Park.
INSTRUCTION: Blowing dust brings reduced visibility, leading to dangerous driving conditions. If driving, avoid blowing dust if possible. If caught in dense blowing dust, pull off the road, turn off your lights and keep your foot off the brake. Motorists should not drive into an area of blowing dust. PULL ASIDE STAY ALIVE!
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Weather Topic: What are Fractus Clouds?
Home - Education - Cloud Types - Fractus Clouds
Next Topic: Freezing Rain
A fractus cloud (scud) is a fragmented, tattered cloud which has
likely been sheared off of another cloud. They are accessory clouds, meaning they
develop from parent clouds, and are named in a way which describes the original
cloud which contained them.
Fractus clouds which have originated from cumulus clouds are referred to as
cumulus fractus, while fractus clouds which have originated from stratus clouds
are referred to as stratus fractus. Under certain conditions a fractus cloud might
merge with another cloud, or develop into a cumulus cloud, but usually a
fractus cloud seen by itself will dissipate rapidly.
They are often observed on the leading and trailing edges of storm clouds,
and are a display of wind activity.
Next Topic: Freezing Rain
Weather Topic: What is Graupel?
Home - Education - Precipitation - Graupel
Next Topic: Hail
Graupel is a form of precipitation that is created by atmospheric conditions
which cause supercooled water droplets to contact snow crystals and freeze to
their surface.
Sometimes known as soft hail or snow pellets, graupel is delicate and easily
destroyed by touch. Whereas hail usually falls during severe weather, graupel
doesn't require such conditions to form, and can form in mild precipitation
similar to situations which produce snowfall.
Next Topic: Hail
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