Weather Alert in Arizona
Severe Thunderstorm Warning issued September 3 at 8:08PM MST until September 3 at 9:00PM MST by NWS Phoenix AZ
AREAS AFFECTED: Maricopa, AZ; Pinal, AZ
DESCRIPTION: SVRPSR The National Weather Service in Phoenix has issued a * Severe Thunderstorm Warning for... Maricopa County in south central Arizona... Pinal County in southeastern Arizona... * Until 900 PM MST. * At 807 PM MST, a severe thunderstorm was located over Bapchule, or near Sun Lakes, moving north at 5 mph. HAZARD...60 mph wind gusts. SOURCE...Radar indicated. IMPACT...Expect damage to roofs, siding, and trees. * Locations impacted include... Chandler, Gilbert, Casa Grande, Sun Lakes, Maricopa, Queen Creek, Chandler Heights, Tumbleweed Park, Chandler City Hall, Seville, Bapchule, Olberg, Chandler Fashion Center Mall, Firebird Lake, and Sacaton. This includes the following highways... AZ Interstate 10 between mile markers 159 and 185. AZ Route 87 between mile markers 149 and 166. AZ Route 202 between mile markers 42 and 55.
INSTRUCTION: For your protection move to an interior room on the lowest floor of a building.
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Weather Topic: What are Shelf Clouds?
Home - Education - Cloud Types - Shelf Clouds
Next Topic: Sleet
A shelf cloud is similar to a wall cloud, but forms at the front
of a storm cloud, instead of at the rear, where wall clouds form.
A shelf cloud is caused by a series of events set into motion by the advancing
storm; first, cool air settles along the ground where precipitation has just fallen.
As the cool air is brought in, the warmer air is displaced, and rises above it,
because it is less dense. When the warmer air reaches the bottom of the storm cloud,
it begins to cool again, and the resulting condensation is a visible shelf cloud.
Next Topic: Sleet
Weather Topic: What is Snow?
Home - Education - Precipitation - Snow
Next Topic: Stratocumulus Clouds
Snow is precipitation taking the form of ice crystals. Each ice crystal, or snowflake,
has unique characteristics, but all of them grow in a hexagonal structure.
Snowfall can last for sustained periods of time and result in significant buildup
of snow on the ground.
On the earth's surface, snow starts out light and powdery, but as it begins to melt
it tends to become more granular, producing small bits of ice which have the consistency of
sand. After several cycles of melting and freezing, snow can become very dense
and ice-like, commonly known as snow pack.
Next Topic: Stratocumulus Clouds
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